Pixel circuit, driving method thereof, driving device and display equipment

Abstract

The invention discloses a pixel circuit, a driving method thereof, a driving device and display equipment, and belongs to the technical field of display equipment. The pixel circuit comprises a light emitting diode, a storage capacitor, a first switch tube, a second switch tube, a third switch tube and a fourth switch tube, wherein in a first switching period after a display frame signal is switched from a high level to a low level, the first switching tube and the third switching tube are disconnected, and the second switching tube and the fourth switching tube are closed, so that the light emitting diode and the storage capacitor are reset through a second reference signal; and in a first switching period after the display frame signal is switched from the low level to the high level, the first switching tube and the third switching tube are closed, and the second switching tube and the fourth switching tube are disconnected, so that the light emitting diode and the storage capacitor are reset through the first reference signal.

Description

Technical Field

[0001] The present application belongs to the technical field of display devices, and specifically relates to a pixel circuit and a driving method thereof, a driving device and a display device. Background Art

[0002] In the related technology, mobile phones, tablet computers, wearable devices, smart car machines and other devices use touch screens for human-computer interaction. The touch screen includes a display panel and a touch circuit. When the display panel refreshes the displayed content, the pixel circuit continuously switches between high and low potentials during the process from signal writing to light emission. The high and low changing points will cause signal interference to the touch circuit, forming touch ghost points. Summary of the invention

[0003] The present application aims to provide a pixel circuit and a driving method, a driving device and a display device thereof, which can solve the problem in the related art that the pixel circuit generates signal interference to the touch circuit and forms touch ghost points.

[0004] In a first aspect, an embodiment of the present application provides a pixel circuit, the pixel circuit comprising:

[0005] A light emitting diode, wherein the cathode of the light emitting diode is grounded;

[0006] A storage capacitor, wherein a first end of the storage capacitor receives an anode signal of the light emitting diode;

[0007] A first switch tube, wherein a first end of the first switch tube is electrically connected to an anode of the light-emitting diode, and a second end of the first switch tube receives a first reference signal;

[0008] A second switch tube, wherein a first end of the second switch tube is electrically connected to the anode of the light-emitting diode, and a second end of the second switch tube receives a second reference signal;

[0009] A third switch tube, a first end of the third switch tube is electrically connected to the second end of the storage capacitor, and a second end of the third switch tube is connected to the first reference signal;

[0010] a fourth switch tube, wherein a first end of the fourth switch tube is electrically connected to a second end of the storage capacitor, and a second end of the fourth switch tube is connected to a second reference signal;

[0011] In which, within the first switching cycle after the display frame signal switches from a high level to a low level, the first switch tube and the third switch tube are disconnected, and the second switch tube and the fourth switch tube are closed, so as to reset the light-emitting diode and the storage capacitor through the second reference signal; and, within the first switching cycle after the display frame signal switches from a low level to a high level, the first switch tube and the third switch tube are closed, and the second switch tube and the fourth switch tube are disconnected, so as to reset the light-emitting diode and the storage capacitor through the first reference signal.

[0012] In a second aspect, an embodiment of the present application provides a driving method for a pixel circuit, the method comprising:

[0013] Generate a display driving signal, the display driving signal includes a display frame signal and a display data signal;

[0014] When the display frame signal is switched from a low level to a high level, the voltage of the display data signal is controlled to be gradually increased to a black state voltage with a first preset voltage step length and a preset number of steps within a first preset period;

[0015] When the display frame signal switches from a high level to a low level, the voltage of the display data signal is controlled to gradually decrease to the data voltage with a first preset voltage step length and a preset number of steps within a second preset period.

[0016] In a third aspect, an embodiment of the present application provides a driving method for a pixel circuit, wherein the pixel circuit includes a storage capacitor, and the method includes:

[0017] Generate a display drive signal, the display drive signal includes a reference signal and a pixel voltage signal, the reference signal is used to turn on the reset switch tube to reset the storage capacitor, and the pixel voltage signal is used to turn on the data switch tube to charge the storage capacitor;

[0018] Among them, within a cycle in which the reference signal turns on the reset switch tube, the reference signal controls the reset switch tube to turn off N times; within a cycle in which the pixel voltage signal turns on the data switch tube, the pixel voltage signal controls the data switch tube to turn off M times, N and M are positive integers, and M is greater than N.

[0019] In a fourth aspect, an embodiment of the present application provides a driving device for a pixel circuit, the driving device comprising:

[0020] A first generating module, used to generate a display driving signal, the display driving signal includes a display frame signal and a display data signal;

[0021] The control module is used to control the voltage of the display data signal to gradually increase to the black state voltage within a first preset period with a first preset voltage step and a preset number of steps when the display frame signal switches from a low level to a high level; and to control the voltage of the display data signal to gradually decrease to the data voltage within a second preset period with a first preset voltage step and a preset number of steps when the display frame signal switches from a high level to a low level.

[0022] In a fifth aspect, an embodiment of the present application provides a driving device for a pixel circuit, wherein the pixel circuit includes a storage capacitor, and the driving device includes:

[0023] A second generating module is used to generate a display driving signal, the display driving signal includes a reference signal and a pixel voltage signal, the reference signal is used to turn on the reset switch tube to reset the storage capacitor, and the pixel voltage signal is used to turn on the data switch tube to charge the storage capacitor;

[0024] Among them, within a cycle in which the reference signal turns on the reset switch tube, the reference signal controls the reset switch tube to turn off N times; within a cycle in which the pixel voltage signal turns on the data switch tube, the pixel voltage signal controls the data switch tube to turn off M times, N and M are positive integers, and M is greater than N.

[0025] In a sixth aspect, an embodiment of the present application proposes a display device, comprising a pixel circuit as proposed in the first aspect; and / or a driving device for the pixel circuit as proposed in the fourth aspect or the fifth aspect.

[0026] In an embodiment of the present application, by optimizing the pixel circuit, adding a second reference signal on the basis of the original first reference signal, and using different reference signals at different timings, the potential switching amplitude of the pixel circuit during the display frame switching can be reduced, thereby avoiding the formation of touch ghost points caused by the pixel circuit generating signal interference to the touch circuit during the display frame switching.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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:

[0029] Figure 1 A circuit schematic diagram showing pixel circuits of some embodiments of the present application;

[0030] Figure 2 A schematic diagram showing the structure of a pixel circuit in some embodiments of the present application is shown;

[0031] Figure 3A A schematic diagram showing a display device and a pixel circuit according to some embodiments of the present application;

[0032] Figure 3B A schematic diagram showing the structure of a pixel circuit in some embodiments of the present application is shown;

[0033] Figure 4 A schematic diagram showing driving signals of pixel circuits of some embodiments of the present application is shown;

[0034] Figure 5 A schematic diagram showing driving signals of pixel circuits of some embodiments of the present application is shown;

[0035] Figure 6 A schematic diagram showing driving signals of pixel circuits of some embodiments of the present application is shown;

[0036] Figure 7 A flowchart showing a method for driving a pixel circuit according to some embodiments of the present application is shown;

[0037] Figure 8 A schematic diagram showing driving signals of pixel circuits of some embodiments of the present application is shown;

[0038] Fig. 9 A schematic diagram showing driving signals of pixel circuits of some embodiments of the present application is shown;

[0039] Fig.10 A schematic diagram showing driving signals of pixel circuits of some embodiments of the present application is shown;

[0040] Fig.11 A schematic diagram showing driving signals of pixel circuits of some embodiments of the present application is shown;

[0041] Fig.12 A schematic diagram showing driving signals of pixel circuits of some embodiments of the present application is shown;

[0042] Fig.13 A flowchart showing a method for driving a pixel circuit according to some embodiments of the present application is shown;

[0043] Fig.14 A schematic diagram showing driving signals of pixel circuits of some embodiments of the present application is shown;

[0044] Fig.15 A structural block diagram showing a driving device of a pixel circuit in some embodiments of the present application is shown;

[0045] Fig.16 A structural block diagram of a driving device for a pixel circuit according to some embodiments of the present application is shown.

[0046] Reference numerals:

[0047] 100 pixel circuits, 200 display devices;

[0048] LED light emitting diode, Cst storage capacitor, T1 first switch tube, T2 second switch tube, T3 third switch tube, T4 fourth switch tube, T5 fifth switch tube, T6 sixth switch tube, T7 seventh switch tube, T8 eighth switch tube, T9 ninth switch tube. DETAILED DESCRIPTION

[0049] The embodiments of the present application will be described in detail below. 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.

[0050] 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.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] Combine the following Figures 1 to 16 A pixel circuit and a driving method, a driving device and a display device according to embodiments of the present application are described.

[0054] In some embodiments of the present application, a pixel circuit is provided. Figure 1 FIG. 1 shows a circuit diagram of a pixel circuit 100 according to some embodiments of the present application. Figure 2 1 is a schematic diagram showing the structure of a pixel circuit 100 according to some embodiments of the present application. Figure 3ASchematic diagram showing a display device 200 and a pixel circuit 100 according to some embodiments of the present application, Figure 3B Schematic diagrams showing the structure of pixel circuits in some embodiments of the present application; Figure 1 , Figure 2 , Figure 3A and Figure 3B As shown, the pixel circuit 100 includes:

[0055] The light emitting diode LED, the cathode of the light emitting diode LED is grounded;

[0056] A storage capacitor Cst, wherein a first end of the storage capacitor Cst receives an anode signal of the light emitting diode;

[0057] A first switch tube T1, wherein a first end of the first switch tube T1 is electrically connected to an anode of the light emitting diode LED, and a second end of the first switch tube T1 receives a first reference signal;

[0058] A second switch tube T2, wherein a first end of the second switch tube T2 is electrically connected to an anode of the light emitting diode LED, and a second end of the second switch tube T2 receives a second reference signal;

[0059] A third switch tube T3, a first end of the third switch tube T3 is electrically connected to the second end of the storage capacitor Cst, and a second end of the third switch tube T3 is connected to the first reference signal;

[0060] A fourth switch tube T4, wherein a first end of the fourth switch tube T4 is electrically connected to a second end of the storage capacitor Cst, and a second end of the fourth switch tube T4 is connected to a second reference signal;

[0061] In the first switching cycle after the display frame signal is switched from a high level to a low level, the first switch tube T1 and the third switch tube T3 are disconnected, and the second switch tube T2 and the fourth switch tube T4 are closed, so as to reset the light emitting diode LED and the storage capacitor Cst through the second reference signal; and in the first switching cycle after the display frame signal is switched from a low level to a high level, the first switch tube T1 and the third switch tube T3 are closed, and the second switch tube T2 and the fourth switch tube T4 are disconnected, so as to reset the light emitting diode LED and the storage capacitor Cst through the first reference signal. In the first switching cycle after the display frame signal is switched from a low level to a high level, the first switch tube T1 and the third switch tube T3 are closed, and the second switch tube T2 and the fourth switch tube T4 are disconnected, so as to reset the light emitting diode LED and the storage capacitor Cst through the first reference signal. In the above, Vdata, including Vdata1, Vdata2, Vdata3 and Vdata4, are all driving voltage signals.

[0062] In the embodiments of the present application, Figure 2 , Figure 3A and Figure 3B As shown, taking a mobile phone or other electronic device as an example, the display device 200 of the mobile phone is a touch screen, and the touch screen includes a display panel and a touch surface, such as Figure 2As shown, the pixel circuit 100 of the display panel can be simply regarded as a driving unit, and the driving units are arranged and distributed on the display panel.

[0063] In order to reduce the interference of the pixel circuit 100 on the touch circuit when switching display frames, the present application provides a pixel circuit 100, such as Figure 1 As shown, the pixel circuit 100 includes a first switch tube T1, a second switch tube T2, a third switch tube T3 and a fourth switch tube T4.

[0064] The first switch tube T1 and the second switch tube T2 are used to switch the reference signal of the light emitting diode LED, and the third switch tube T3 and the fourth switch tube T4 are used to switch the reference signal of the storage capacitor. When the pixel circuit 100 is working, the switch states of the first switch tube T1, the second switch tube T2, the third switch tube T3 and the fourth switch tube T4 are switched according to different timing intervals, so as to switch to reset the light emitting diode LED and the storage capacitor through the first reference signal or the second reference signal.

[0065] For example, Figure 4 , Figure 5 and Figure 6 Schematic diagrams of driving signals of pixel circuits of some embodiments of the present application are shown. Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, Vref1 is the first reference signal, Vref2 is the second reference signal, TE is the display frame signal, Source is the display data signal, MUX_R is the red pixel driving signal, MUX_G1 and MUX_G2 are the green pixel driving signals, MUX_B is the blue pixel driving signal, S1 is the switching signal corresponding to the first reference signal, S2 is the pixel voltage switching signal, S3 is the switching signal corresponding to the second reference signal, Emit is the main gate switching signal for controlling the pixel circuit 100, and PVDD is the anode signal of the light-emitting diode.

[0066] Among them, in the first switching cycle after the display frame signal TE switches from a low level to a high level, the first switch tube T1 and the third switch tube T3 are closed, and the second switch tube T2 and the fourth switch tube T4 are disconnected. At this time, the first reference signal is connected and reset is performed through the first reference signal. At this time, the driving signal is as follows: Figure 5 The switching period is the MUX switching period, that is, the switching period of MUX_R, MUX_G1 and MUX_G2, MUX_B.

[0067] In the first switching cycle after the display frame signal TE switches from a high level to a low level, the first switch tube T1 and the third switch tube T3 are disconnected, and the second switch tube T2 and the fourth switch tube T4 are closed. At this time, the second reference signal is connected and reset is performed by the second reference signal. At this time, the driving signal is as follows: Figure 4 shown.

[0068] In other frame signal intervals, Figure 6 As shown, the driving logic at this time remains unchanged.

[0069] The present application optimizes the pixel circuit 100, adds a second reference signal based on the original first reference signal, and uses different reference signals at different timings, thereby reducing the potential switching amplitude of the pixel circuit 100 during display frame switching, and avoiding touch ghost points caused by signal interference generated by the pixel circuit 100 to the touch circuit during display frame switching.

[0070] In some embodiments of the present application, the light-emitting diode LED includes a red light-emitting diode, a blue light-emitting diode and a green light-emitting diode; wherein the voltage value of the second reference signal is equal to half of the difference between the black state voltage and the first voltage value, wherein the first voltage value is the voltage value when the red light-emitting diode emits light at a first preset brightness; the voltage value of the first reference signal is equal to the difference between the second voltage value and the black state voltage, wherein the second voltage value is equal to twice the first voltage value.

[0071] In the embodiment of the present application, the pixel circuit 100 is an RGB (Red-Green-Blue) pixel circuit 100, wherein the light emitting diode LED includes a red light emitting diode, a blue light emitting diode and a green light emitting diode.

[0072] The voltage of the first reference signal is set to be as negative as possible. For example, the voltage Vref1 of the first reference signal satisfies the following formula: Vref1 = 2 × Vdata@R_pixel-VGMP. Wherein, Vdata@R_pixel is the voltage value when the red light-emitting diode emits light at the first preset brightness, specifically, the voltage value when the red light-emitting diode emits light at grayscale 255, and VGMP is the black state voltage.

[0073] The voltage Vref2 of the second reference signal is set to satisfy the following formula: (VGMP-Vdata@R_pixel)÷2, wherein Vdata@R_pixel is the voltage value when the red LED emits light at the first preset brightness, specifically the voltage value when the red LED emits light at grayscale 255, and VGMP is the black state voltage.

[0074] By adjusting the reference voltage of the first reference signal and setting the second reference signal, interference to the touch circuit during display frame switching can be reduced, thereby improving the touch interference plus noise ratio (SNR) of an electronic device using the pixel circuit 100.

[0075] In some embodiments of the present application, the pixel circuit 100 further includes: a fifth switch tube T5, a first end of the fifth switch tube T5 receiving a display data signal; a sixth switch tube T6, a first end of the sixth switch tube T6 being electrically connected to a second end of the fifth switch tube T5; a seventh switch tube T7, a first end of the seventh switch tube T7 being electrically connected to a second end of the sixth switch tube T6, and a second end of the seventh switch tube T7 being electrically connected to an anode of a light-emitting diode LED; an eighth switch tube T8, a first end of the eighth switch tube T8 being electrically connected to a second end of the sixth switch tube T6, and a second end of the eighth switch tube T8 being electrically connected to a second end of a storage capacitor; and a ninth switch tube T9, a first end of the ninth switch tube T9 being electrically connected to a first end of the seventh switch tube T7, and a second end of the ninth switch tube T9 receiving an anode signal of the light-emitting diode.

[0076] In the embodiment of the present application, the pixel circuit 100 further includes a fifth switch tube T5, a sixth switch tube T6, a seventh switch tube T7, an eighth switch tube T8 and a ninth switch tube T9, so that the pixel circuit 100 becomes a 9T1C structure. Among them, the first end of the sixth switch tube T6 is electrically connected to the second end of the fifth switch tube T5, the second end of the sixth switch tube T6 is electrically connected to the first end of the seventh switch tube T7, the second end of the seventh switch tube T7 is electrically connected to the anode of the light emitting diode LED, the first end of the eighth switch tube T8 is electrically connected to the drop-in terminal of the sixth switch tube T6, the second end of the eighth switch tube is electrically connected to the storage capacitor, the first end of the ninth switch tube T9 is electrically connected to the seventh switch tube T7, and the second end of the ninth switch tube T9 receives the anode signal of the light emitting diode.

[0077] When the ninth switch tube T9 , the sixth switch tube T6 and the seventh switch tube are turned on, the anode signal of the light emitting diode is received by the light emitting diode LED, and the light emitting diode LED starts to emit light.

[0078] The embodiment of the present application involves a new 9T1C pixel circuit, which can reduce interference with touch during display frame switching.

[0079] In some embodiments of the present application, a driving method of a pixel circuit is provided. Figure 7 A flowchart of a driving method of a pixel circuit according to some embodiments of the present application is shown. Figure 7 As shown, the method includes:

[0080] Step 702, generating a display driving signal, the display driving signal includes a display frame signal and a display data signal;

[0081] Step 704, when the display frame signal is switched from a low level to a high level, controlling the voltage of the display data signal to gradually increase to a black state voltage within a first preset period with a first preset voltage step length and a preset number of steps;

[0082] Step 706 , when the display frame signal switches from a high level to a low level, controlling the voltage of the display data signal to gradually decrease to the data voltage within a second preset period with a first preset voltage step length and a preset number of steps.

[0083] In the embodiments of the present application, Figure 8 , Fig. 9 , Fig.10 and Fig.11 Schematic diagrams showing driving signals of pixel circuits of some embodiments of the present application are shown. Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, TE is the display frame signal, Source is the display data signal, MUX_R is the red pixel drive signal, MUX_G1 and MUX_G2 are the green pixel drive signals, MUX_B is the blue pixel drive signal, S1 is the switch signal corresponding to the reference signal, S2 is the pixel voltage switch signal, and Emit is the main gate switch signal for controlling the pixel circuit.

[0084] Among them, during the period when the display frame signal TE is set high, such as Figure 8 As shown, when the display frame signal TE switches from a low level to a high level, the display data signal Source is controlled to raise the voltage in stages, for example, within a set first preset period, the voltage value of the display data signal Source is gradually increased in stages with a first preset voltage step length and a preset number of steps, thereby preventing interference caused by a sudden rise in the voltage of the display data signal Source. Fig. 9 As shown, RX1 is the receiving channel of the touch circuit in the prior art, and RX2 is the receiving channel of the touch circuit after applying the driving method of the touch circuit of the embodiment of the present application. It can be seen that the present application can significantly reduce the disturbance size of the pixel circuit to the touch circuit.

[0085] During the period when the display frame signal TE is set high, if Fig.10 As shown, when the display frame signal TE switches from a high level to a low level, the display data signal Source is controlled to reduce the voltage in segments, for example, within a set second preset period, the first preset voltage step and the preset number of steps are used to gradually reduce the voltage value of the data signal Source in segments, thereby preventing interference caused by a sudden rise in the voltage of the display data signal Source. Fig.11As shown, RX1 is the receiving channel of the touch circuit in the prior art, and RX2 is the receiving channel of the touch circuit after applying the driving method of the touch circuit of the embodiment of the present application. This application can significantly reduce the disturbance size of the pixel circuit on the touch circuit.

[0086] The present application can reduce the disturbance magnitude of the pixel circuit to the touch circuit without changing the pixel circuit hardware, thereby avoiding touch ghost points caused by signal interference generated by the pixel circuit to the touch circuit during display frame switching.

[0087] In some embodiments of the present application, the first preset period is the first half period of the high level period of the display frame signal after the display frame signal switches to a high level; the second preset period is the second half period of the high level period of the display frame signal before the display frame signal switches to a low level.

[0088] In the embodiment of the present application, when the display frame signal TE switches from a low level to a high level, the display data signal Source is controlled to raise the voltage in stages within a first preset period, and the first preset period is the first half period of the high level period of the display frame signal TE. When the display frame signal TE switches from a high level to a low level, the display data signal Source is controlled to lower the voltage in stages within a second preset period, and the second preset period is the second half period of the high level period of the display frame signal TE.

[0089] In some embodiments of the present application, the pixel circuit includes a light-emitting diode, which includes a red light-emitting diode, a blue light-emitting diode, and a green light-emitting diode; the voltage value of the first preset voltage step is equal to the ratio of the difference between the black state voltage and the first voltage value to the preset number of steps; wherein the first voltage value is the voltage value when the red light-emitting diode emits light at a second preset brightness, and the preset number of steps is a positive integer greater than or equal to 2.

[0090] In the embodiment of the present application, the pixel circuit is an RGB (pixel circuit, wherein the light emitting diode includes a red light emitting diode, a blue light emitting diode and a green light emitting diode. When the display frame signal TE is switched from a low level to a high level, and when the display frame signal TE is switched from a high level to a low level, the display data signal Source is raised or lowered in voltage according to a first preset voltage step.

[0091] The voltage value Vstep of the first preset voltage step satisfies the following formula: Vstep=(VGMP-V_Data@Rpixel)÷X. Wherein, VGMP is the black state voltage, V_Data@R pixel is the voltage value when the red light emitting diode emits light at the second preset brightness, specifically the voltage of the red light emitting diode at normal brightness, X is the preset number of steps, and X≥2. Exemplarily, X=2. Exemplarily, X=3. Exemplarily, X=4.

[0092] In some embodiments of the present application, the display drive signal also includes a reset voltage signal and a pixel voltage signal, and the method also includes: within a switching cycle, whenever the light-emitting diode switches the light-emitting color, controlling the voltage of the display data signal to gradually increase the voltage or gradually decrease the voltage within a third preset cycle with a second preset voltage step; wherein the third preset cycle includes a trigger period of the reset voltage signal and the first half period of the output period of the pixel voltage signal.

[0093] In an embodiment of the present application, taking an RGBG (Red Grey Blue Green) pixel circuit, that is, a pixel circuit including a red pixel, two green pixels and one blue pixel, as an example, during the period when the display frame signal TE is set low, the multiplexer (MUX) switching period is the RGBG switching period.

[0094] Fig.12 Schematic diagrams of driving signals of pixel circuits of some embodiments of the present application are shown. Fig.12 As shown, TE is the display frame signal, Source is the display data signal, MUX_R is the red pixel drive signal, MUX_G1 and MUX_G2 are the green pixel drive signals, MUX_B is the blue pixel drive signal, S1 is the switch signal corresponding to the reset voltage signal, S2 is the pixel voltage switch signal, and Emit is the main gate switch signal for controlling the pixel circuit.

[0095] like Fig.12 As shown, when RGBG is switched, that is, when the light-emitting diode switches the luminous color, the voltage of the display data signal is controlled to gradually increase or decrease the voltage with a second preset voltage step within the third preset period; wherein the third preset period includes the trigger period of the reset voltage signal and the first half period of the output period of the pixel voltage signal. Exemplarily, the third preset period is Fig.12 One cycle of signal S1 and the first half cycle of signal S2.

[0096] The present application reduces the interference to the touch control circuit during the display frame switching period while maintaining the hardware cost of the pixel circuit unchanged by controlling the display data signal to gradually raise the voltage.

[0097] In some embodiments of the present application, the pixel circuit includes a storage capacitor, Fig.13 A flowchart of a driving method of a pixel circuit according to some embodiments of the present application is shown. Fig.13 As shown, the method includes:

[0098] Step 1302, generating a display driving signal, the display driving signal includes a reset voltage signal and a pixel voltage signal, the reset voltage signal is used to turn on the reset switch tube to reset the storage capacitor, and the pixel voltage signal is used to turn on the data switch tube to charge the storage capacitor;

[0099] Among them, within a cycle in which the reset voltage signal turns on the reset switch tube, the reset voltage signal controls the reset switch tube to be turned off N times; within a cycle in which the pixel voltage signal turns on the data switch tube, the pixel voltage signal controls the data switch tube to be turned off M times, N and M are positive integers, and M is greater than N.

[0100] In the embodiments of the present application, Fig.14 Schematic diagrams of driving signals of pixel circuits of some embodiments of the present application are shown. Fig.14 As shown, TE is the display frame signal, Source is the display data signal, MUX_R is the red pixel drive signal, MUX_G1 and MUX_G2 are the green pixel drive signals, MUX_B is the blue pixel drive signal, S1 is the reset voltage signal, S2 is the pixel voltage signal, and Emit is the main gate switch signal for controlling the pixel circuit.

[0101] like Fig.14 As shown, when the reset voltage signal S1 is low, the reset switch is turned on, the reset voltage signal is received by the storage capacitor, and the storage capacitor is reset. When the pixel voltage signal S2 is low, the data switch is turned on, and the storage capacitor is charged.

[0102] In each cycle when the reset voltage signal is low, the reset voltage signal is high N times, so that the reset switch is turned off N times. In each cycle when the pixel voltage signal is low, the pixel voltage signal is high M times, so that the data switch is turned off M times.

[0103] Since capacitor charging and discharging is a continuous process, during the charging or discharging process of the storage capacitor, the capacitor charging can be paused by turning off the switch tube, thereby simulating the effect of a phased increase in the capacitor voltage, avoiding disturbances to the touch circuit caused by instantaneous voltage increases, and avoiding touch ghost points caused by signal interference from the pixel circuit to the touch circuit during display frame switching.

[0104] In some embodiments of the present application, a driving device for a pixel circuit is provided. Fig.15 The structure block diagram of the driving device of the pixel circuit of some embodiments of the present application is shown as follows: Fig.15 As shown, the driving device 1500 includes:

[0105] A first generating module 1502, configured to generate a display driving signal, wherein the display driving signal includes a display frame signal and a display data signal;

[0106] The control module 1504 is used to control the voltage of the display data signal to gradually increase to the black state voltage within a first preset period with a first preset voltage step size and a preset number of steps when the display frame signal switches from a low level to a high level; and to control the voltage of the display data signal to gradually decrease to the data voltage within a second preset period with a first preset voltage step size and a preset number of steps when the display frame signal switches from a high level to a low level.

[0107] The present application can reduce the disturbance magnitude of the pixel circuit to the touch circuit without changing the pixel circuit hardware, thereby avoiding touch ghost points caused by signal interference generated by the pixel circuit to the touch circuit during display frame switching.

[0108] In some embodiments of the present application, a driving device for a pixel circuit is provided. Fig.16 The structure block diagram of the driving device of the pixel circuit of some embodiments of the present application is shown as follows: Fig.16 As shown, the driving device 1600 includes:

[0109] The second generating module 1602 is used to generate a display driving signal, which includes a reset voltage signal and a pixel voltage signal. The reset voltage signal is used to turn on the reset switch tube to reset the storage capacitor, and the pixel voltage signal is used to turn on the data switch tube to charge the storage capacitor; wherein, within a cycle in which the reset voltage signal turns on the reset switch tube, the reset voltage signal controls the reset switch tube to turn off N times; within a cycle in which the pixel voltage signal turns on the data switch tube, the pixel voltage signal controls the data switch tube to turn off M times, N and M are positive integers, and M is greater than N.

[0110] The present application can pause the charging of the capacitor by turning off the switch tube, thereby simulating the effect of a phased increase in the capacitor voltage, avoiding disturbances to the touch circuit caused by an instantaneous increase in voltage, and avoiding touch ghost points caused by signal interference from the pixel circuit to the touch circuit during display frame switching.

[0111] 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.

[0112] 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: The pixel circuit comprises: A light emitting diode, wherein the cathode of the light emitting diode is grounded; A storage capacitor, wherein a first end of the storage capacitor receives an anode signal of the light emitting diode; A first switch tube, wherein a first end of the first switch tube is electrically connected to an anode of the light-emitting diode, and a second end of the first switch tube receives a first reference signal; a second switch tube, wherein a first end of the second switch tube is electrically connected to the anode of the light-emitting diode, and a second end of the second switch tube receives a second reference signal; a third switch tube, wherein a first end of the third switch tube is electrically connected to a second end of the storage capacitor, and a second end of the third switch tube is connected to the first reference signal; a fourth switch tube, wherein a first end of the fourth switch tube is electrically connected to a second end of the storage capacitor, and a second end of the fourth switch tube is connected to the second reference signal; Wherein, within the first switching cycle after the display frame signal switches from a high level to a low level, the first switch tube and the third switch tube are disconnected, and the second switch tube and the fourth switch tube are closed, so as to reset the light-emitting diode and the storage capacitor through the second reference signal; and, within the first switching cycle after the display frame signal switches from a low level to a high level, the first switch tube and the third switch tube are closed, and the second switch tube and the fourth switch tube are disconnected, so as to reset the light-emitting diode and the storage capacitor through the first reference signal.

2. The pixel circuit according to claim 1, characterized in that: The light emitting diodes include a red light emitting diode, a blue light emitting diode and a green light emitting diode; Wherein, the voltage value of the second reference signal is equal to half of the difference between the black state voltage and the first voltage value, wherein the first voltage value is the voltage value when the red light emitting diode emits light at a first preset brightness; The voltage value of the first reference signal is equal to the difference between a second voltage value and the black state voltage, wherein the second voltage value is equal to twice the first voltage value.

3. The pixel circuit according to claim 1, characterized in that: The pixel circuit further includes: a fifth switch tube, wherein a first end of the fifth switch tube receives a display data signal; a sixth switch tube, wherein a first end of the sixth switch tube is electrically connected to a second end of the fifth switch tube; a seventh switch tube, wherein a first end of the seventh switch tube is electrically connected to a second end of the sixth switch tube, and a second end of the seventh switch tube is electrically connected to an anode of the light-emitting diode; an eighth switch tube, wherein a first end of the eighth switch tube is electrically connected to a second end of the sixth switch tube, and a second end of the eighth switch tube is electrically connected to a second end of the storage capacitor; A ninth switch tube, wherein a first end of the ninth switch tube is electrically connected to a first end of the seventh switch tube, and a second end of the ninth switch tube receives an anode signal of the light emitting diode.

4. A method for driving a pixel circuit, characterized in that: The method comprises: generating a display driving signal, wherein the display driving signal comprises a display frame signal and a display data signal; When the display frame signal switches from a low level to a high level, controlling the voltage of the display data signal to gradually increase to a black state voltage within a first preset period with a first preset voltage step length and a preset number of steps; And, when the display frame signal switches from a high level to a low level, the voltage of the display data signal is controlled to be gradually reduced to the data voltage within a second preset period with the first preset voltage step length and the preset number of steps.

5. The driving method according to claim 4, characterized in that: The first preset period is the first half period of the high level period of the display frame signal after the display frame signal switches to the high level; The second preset period is the second half period of the high level period of the display frame signal before the display frame signal switches to the low level.

6. The driving method according to claim 4, characterized in that: The pixel circuit includes a light emitting diode, and the light emitting diode includes a red light emitting diode, a blue light emitting diode and a green light emitting diode; The voltage value of the first preset voltage step is equal to the ratio of the difference between the black state voltage and the first voltage value to the preset number of steps; wherein, the first voltage value is the voltage value when the red light-emitting diode emits light at a second preset brightness, and the preset number of steps is a positive integer greater than or equal to 2.

7. The driving method according to claim 6, characterized in that: The display driving signal further includes a reset voltage signal and a pixel voltage signal, and the method further includes: In a switching cycle, whenever the light emitting diode switches the light emitting color, the voltage of the display data signal is controlled to gradually increase or decrease the voltage with a second preset voltage step length in a third preset cycle; The third preset period includes a trigger period of the reset voltage signal and a first half period of an output period of the pixel voltage signal.

8. A method for driving a pixel circuit, characterized in that: The pixel circuit includes a storage capacitor, and the method includes: Generate a display driving signal, wherein the display driving signal includes a reset voltage signal and a pixel voltage signal, wherein the reset voltage signal is used to turn on the reset switch tube to reset the storage capacitor, and the pixel voltage signal is used to turn on the data switch tube to charge the storage capacitor; Among them, within a cycle in which the reset voltage signal turns on the reset switch tube, the reset voltage signal controls the reset switch tube to be turned off N times; within a cycle in which the pixel voltage signal turns on the data switch tube, the pixel voltage signal controls the data switch tube to be turned off M times, N and M are positive integers, and M is greater than N.

9. A driving device for a pixel circuit, characterized in that: The driving device comprises: A first generating module, configured to generate a display driving signal, wherein the display driving signal includes a display frame signal and a display data signal; A control module, configured to control the voltage of the display data signal to gradually increase to a black state voltage within a first preset period with a first preset voltage step length and a preset number of steps when the display frame signal is switched from a low level to a high level; And, when the display frame signal switches from a high level to a low level, the voltage of the display data signal is controlled to be gradually reduced to the data voltage within a second preset period with the first preset voltage step length and the preset number of steps.

10. A driving device for a pixel circuit, characterized in that: The pixel circuit includes a storage capacitor, and the driving device includes: A second generating module is used to generate a display driving signal, wherein the display driving signal includes a reset voltage signal and a pixel voltage signal, wherein the reset voltage signal is used to turn on the reset switch tube to reset the storage capacitor, and the pixel voltage signal is used to turn on the data switch tube to charge the storage capacitor; Among them, within a cycle in which the reset voltage signal turns on the reset switch tube, the reset voltage signal controls the reset switch tube to be turned off N times; within a cycle in which the pixel voltage signal turns on the data switch tube, the pixel voltage signal controls the data switch tube to be turned off M times, N and M are positive integers, and M is greater than N.

11. A display device, characterized in that: include: The pixel circuit according to any one of claims 1 to 3; and / or A driving device for a pixel circuit as claimed in claim 9 or 10.

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