Pixel unit brightness compensation circuit and brightness compensation method and display device

Abstract

This article discloses a pixel unit brightness compensation circuit, a brightness compensation method and a display device. The first control module and the second control module set the voltage values ​​of the fifth node and the fourth node to 0V respectively in the first time period, the input module transmits the input signal voltage value to the first node in the second time period, and in the third time period, the second control module transmits the voltage value of the fourth node to the fifth node, the first light-emitting control module, the driving module and the second light-emitting control module conduct the current path through the light-emitting diode, the energy storage module transmits the voltage value of the fourth node to the first node, and the driving module transmits the voltage value of the first node to the second node, so that the voltage difference between the anode and cathode of the light-emitting diode no longer includes the actual voltage value of the cathode of the light-emitting diode. The brightness compensation scheme of this article achieves the accuracy of the pixel unit level and has good real-time performance, which improves the brightness uniformity of the display panel.

Description

Technical Field

[0001] The present invention relates to but is not limited to the field of display technology, and in particular to a pixel unit brightness compensation circuit and a brightness compensation method and a display device. Background Art

[0002] Large-size silicon-based OLED (Organic Light-Emitting Diode) products have higher pixel resolution, larger panel size and higher power consumption, resulting in a much more serious cathode voltage drop (IR Drop) than small-size silicon-based OLEDs.

[0003] In related technologies, such as Figure 1 As shown, the display image of the display panel gradually darkens from the periphery to the center due to the voltage drop. The brightness compensation scheme divides the panel into regions for compensation, tests the brightness of each region under the highest grayscale image, and reduces the brightness of the high-brightness region to the same level as the low-brightness region, resulting in inaccurate brightness compensation and the compensation effect becomes worse as the grayscale decreases. Summary of the invention

[0004] In a first aspect, the present disclosure provides a pixel unit brightness compensation circuit, including: an input module, a driving module, a light emitting module, a first light emitting control module, a second light emitting control module, an energy storage module, a first control module, and a second control module;

[0005] The input module is connected to the input signal terminal, the first control signal terminal and the first node respectively, and is configured to transmit the input signal voltage value of the input signal terminal to the first node within the second time period;

[0006] The driving module is connected to the first node, the second node and the third node respectively, and is configured to transmit the voltage value of the first node to the second node in the second period and the third period, and to conduct the current path between the third node and the second node in the third period;

[0007] The first light-emitting control module is connected to the first power signal terminal, the light-emitting control signal terminal and the third node respectively, and is configured to conduct a current path between the first power signal terminal and the third node in a third time period;

[0008] The second light-emitting control module is connected to the second power signal terminal, the light-emitting control signal terminal and the fourth node respectively, and is configured to conduct a current path between the second power signal terminal and the fourth node in a third time period;

[0009] The light emitting module comprises a light emitting diode, an anode of the light emitting diode is connected to the second node, a cathode of the light emitting diode is connected to the fourth node, and the light emitting diode emits light in a third time period;

[0010] The energy storage module includes a storage capacitor, a first electrode of the storage capacitor is connected to the first node, and a second electrode of the storage capacitor is connected to the fifth node;

[0011] The first control module is connected to the ground signal terminal, the second control signal terminal and the fifth node respectively, and is configured to set the voltage value of the fifth node to 0V in a first time period;

[0012] The second control module is connected to the fifth node, the third control signal terminal and the fourth node respectively, and is configured to set the voltage value of the fourth node to within a first time period, and to transmit the voltage value of the fourth node to the fifth node within a third time period.

[0013] In a second aspect, the present disclosure provides a brightness compensation method for a pixel unit brightness compensation circuit, comprising:

[0014] The first control module sets the voltage value of the fifth node to 0V in the first time period, and the second control module sets the voltage value of the fourth node to 0V in the first time period;

[0015] The input module transmits the input signal voltage value of the input signal terminal to the first node in the second period, and the driving module transmits the voltage value of the first node to the second node in the second period;

[0016] The first light-emitting control module conducts the current path between the first power signal terminal and the third node in the third time period, the second light-emitting control module conducts the current path between the second power signal terminal and the fourth node in the third time period, the second control module transmits the voltage value of the fourth node to the fifth node in the third time period, the energy storage module transmits the voltage value of the fourth node to the first node, the driving module conducts the current path between the third node and the second node in the third time period and transmits the voltage value of the first node to the second node, and the light-emitting module emits light in the third time period.

[0017] In a third aspect, the present disclosure provides a display device, comprising the above-mentioned pixel unit brightness compensation circuit.

[0018] The embodiment of the present disclosure provides a pixel unit brightness compensation circuit and a brightness compensation method and a display device thereof. The first control module and the second control module set the voltage values ​​of the fifth node and the fourth node to 0V respectively in the first period, that is, the second pole of the storage capacitor and the cathode of the light-emitting diode are reset. The input module transmits the input signal voltage value to the first node in the second period. In the third period, the second control module transmits the voltage value of the fourth node to the fifth node, the voltage difference between the two poles of the storage capacitor will not jump, the voltage value of the cathode of the light-emitting diode (the fourth node) is transmitted to the first node through the storage capacitor, the first light-emitting control module, the driving module and the second light-emitting control module conduct the current path flowing through the light-emitting diode, and the voltage value of the first node is transmitted to the second node, so that the voltage difference between the anode and the cathode of the light-emitting diode no longer includes the actual voltage value of the cathode of the light-emitting diode, that is, the current flowing through the light-emitting diode is irrelevant to the actual voltage value of the cathode of the light-emitting diode, so the voltage drop (IR Drop) of the cathode of the light-emitting diode is compensated. The above brightness compensation circuit and brightness compensation method are compensation at the pixel unit level, with high compensation accuracy and good real-time performance, and are suitable for all grayscale conditions, greatly improving the brightness uniformity of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation on the technical solution of the present disclosure.

[0020] Figure 1 A schematic diagram of uneven brightness of a panel due to voltage drop in the related art;

[0021] Figure 2 A schematic diagram of the structure of a pixel unit brightness compensation circuit provided by an embodiment of the present disclosure;

[0022] Figure 3 A schematic diagram of an equivalent circuit of a pixel unit brightness compensation circuit provided by an embodiment of the present disclosure;

[0023] Figure 4 A signal timing diagram of a pixel unit brightness compensation circuit provided by an embodiment of the present disclosure;

[0024] Figure 5 A flowchart of a brightness compensation method of a pixel unit brightness compensation circuit provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the embodiments of the present disclosure will be described in detail in conjunction with the accompanying drawings below. Note that the embodiments can be implemented in multiple different forms. A person of ordinary skill in the art can easily understand the fact that the methods and contents can be transformed into various forms without departing from the purpose and scope of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the contents described in the following embodiments. In the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be arbitrarily combined with each other.

[0026] In the drawings, the size of each component, the thickness of a layer, or the area is sometimes exaggerated for the sake of clarity. Therefore, one embodiment of the present disclosure is not necessarily limited to this size, and the shape and size of each component in the drawings do not reflect the true proportion. In addition, the drawings schematically show ideal examples, and one embodiment of the present disclosure is not limited to the shapes or values ​​shown in the drawings.

[0027] In the present specification, ordinal numbers such as “first”, “second” and “third” are provided to avoid confusion among constituent elements, and are not intended to limit the number.

[0028] In this specification, 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 an indirect connection through an intermediate, or the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0029] In this specification, a transistor refers to an element including at least three terminals: a gate, a drain, and a source. The source and drain of a transistor are symmetrical, and the functions of the "source" and "drain" are sometimes interchanged when using transistors with opposite polarities or when the current direction changes during circuit operation. In the disclosed embodiment, one of the source and the drain is referred to as the first electrode, the other of the source and the drain is referred to as the second electrode, and the gate is referred to as the control electrode.

[0030] In this specification, "electrical connection" includes the case where components are connected together through an element having some electrical function. There is no particular limitation on the "element having some electrical function" as long as it can transmit and receive electrical signals between the connected components. Examples of "element having some electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other elements having various functions.

[0031] The present disclosure provides a pixel unit brightness compensation circuit. Figure 2 As shown, a pixel unit brightness compensation circuit provided by an embodiment of the present disclosure includes: an input module 10, a driving module 20, a light emitting module 30, a first light emitting control module 40, a second light emitting control module 50, an energy storage module 60, a first control module 70 and a second control module 80;

[0032] The input module is connected to the input signal terminal VDATA, the first control signal terminal S1 and the first node N1 respectively, and is configured to transmit the input signal voltage value of the input signal terminal to the first node in the second period;

[0033] The driving module is connected to the first node, the second node N2 and the third node N3 respectively, and is configured to transmit the voltage value of the first node to the second node in the second period and the third period, and to conduct the current path between the third node and the second node in the third period;

[0034] The first light emitting control module is connected to the first power signal terminal ELVDD, the light emitting control signal terminal EM and the third node respectively, and is configured to conduct a current path between the first power signal terminal and the third node in a third time period;

[0035] The second light emitting control module is connected to the second power signal terminal ELVSS, the light emitting control signal terminal EM and the fourth node N4 respectively, and is configured to conduct a current path between the second power signal terminal and the fourth node in a third period;

[0036] The light emitting module comprises a light emitting diode D1, an anode of the light emitting diode is connected to the second node, a cathode of the light emitting diode is connected to the fourth node, and the light emitting diode emits light in a third time period;

[0037] The energy storage module includes a storage capacitor Cs, a first electrode of the storage capacitor is connected to the first node, and a second electrode of the storage capacitor is connected to a fifth node N5;

[0038] The first control module is connected to the ground signal terminal GND, the second control signal terminal S2 and the fifth node respectively, and is configured to set the voltage value of the fifth node to 0V in a first time period;

[0039] The second control module is connected to the fifth node, the third control signal terminal S3 and the fourth node respectively, and is configured to set the voltage value of the fourth node to 0V in the first time period and transfer the voltage value of the fourth node to the fifth node in the third time period.

[0040] In the pixel unit brightness compensation circuit provided by the above embodiment, the first control module and the second control module respectively set the voltage values ​​of the fifth node and the fourth node to 0V in the first period, that is, the second pole of the storage capacitor and the cathode of the light-emitting diode are reset. The input module transmits the input signal voltage value to the first node in the second period. In the third period, the second control module transmits the voltage value of the fourth node to the fifth node, the voltage difference between the two poles of the storage capacitor will not jump, the voltage value of the cathode of the light-emitting diode (the fourth node) is transmitted to the first node through the storage capacitor, the first light-emitting control module, the driving module and the second light-emitting control module conduct the current path flowing through the light-emitting diode, and the voltage value of the first node is transmitted to the second node, so that the voltage difference between the anode and the cathode of the light-emitting diode no longer includes the actual voltage value of the cathode of the light-emitting diode, that is, the current flowing through the light-emitting diode is irrelevant to the actual voltage value of the cathode of the light-emitting diode, thereby compensating the voltage drop (IR Drop) of the cathode of the light-emitting diode. The brightness compensation circuit is a compensation at the pixel unit level, with high compensation accuracy and good real-time performance, and is suitable for all grayscale conditions, greatly improving the brightness uniformity of the display panel.

[0041] In some exemplary embodiments, the light-emitting diode includes an OLED (Organic Light-Emitting Diode).

[0042] like Figure 3 As shown, in some exemplary embodiments, the input module includes a first transistor T1, a control electrode of the first transistor is connected to a first control signal terminal S1, a first electrode of the first transistor is connected to an input signal terminal VDATA, and a second electrode of the first transistor is connected to a first node N1.

[0043] like Figure 3 As shown, in some exemplary embodiments, the driving module includes a driving transistor T2, a control electrode of the driving transistor is connected to the first node N1, a first electrode of the driving transistor is connected to the third node N3, and a second electrode of the driving transistor is connected to the second node N2.

[0044] like Figure 3 As shown, in some exemplary embodiments, the first light emitting control module includes a third transistor T3, the control electrode of the third transistor is connected to the light emitting control signal terminal EM, the first electrode of the third transistor is connected to the first power signal terminal ELVDD, and the second electrode of the third transistor is connected to the third node N3.

[0045] like Figure 3As shown, in some exemplary embodiments, the second light emitting control module includes a fourth transistor T4, the control electrode of the fourth transistor is connected to the light emitting control signal terminal EM, the first electrode of the fourth transistor is connected to the fourth node N4, and the second electrode of the fourth transistor is connected to the second power supply signal terminal ELVSS.

[0046] like Figure 3 As shown, in some exemplary embodiments, the first control module includes a fifth transistor T5, a control electrode of the fifth transistor is connected to the second control signal terminal S2, a first electrode of the fifth transistor is connected to the ground signal terminal GND, and a second electrode of the fifth transistor is connected to a fifth node N5.

[0047] like Figure 3 As shown, in some exemplary embodiments, the second control module includes a sixth transistor T6, a control electrode of the sixth transistor is connected to the third control signal terminal S3, a first electrode of the sixth transistor is connected to the fifth node, and a second electrode of the sixth transistor is connected to the fourth node N4.

[0048] In some exemplary embodiments, the first control signal terminal S1 provides a first control signal, the second control signal terminal S2 provides a second control signal, the third control signal terminal S3 provides a third control signal, the light-emitting control signal terminal EM provides a light-emitting control signal, the input signal terminal VDATA provides an input signal, the voltage value of the input signal is related to the grayscale value of the pixel unit, the first power signal terminal ELVDD provides a first power signal, the second power signal terminal ELVSS provides a second power signal, and the ground signal terminal GND provides a ground signal. The first control signal, the second control signal, the third control signal and the light-emitting control signal are periodic pulse signals, the input signal is a pulse signal, the first power signal, the second power signal and the ground signal are all DC signals, and the voltage value of the first power signal is greater than the voltage value of the second power signal. The voltage value of the ground signal is 0 volts.

[0049] In some exemplary embodiments, Figure 4 As shown, the first control signal is a valid signal in the second time period, and is an invalid signal in other time periods; the second control signal is a valid signal in the first time period, and is an invalid signal in other time periods; the third control signal is a valid signal in the first time period and the third time period, and is an invalid signal in other time periods; the light-emitting control signal is a valid signal in the third time period, and is an invalid signal in other time periods; wherein the valid signal is a voltage signal that turns on the transistor, and the invalid signal is a voltage signal that turns off the transistor.

[0050] The working process of the pixel unit brightness compensation circuit is described below in conjunction with the signal timing diagram.

[0051] Figure 4 The signal timing diagram of the pixel unit brightness compensation circuit is provided (taking all transistors as N-type transistors as an example for explanation). Figure 3 In other embodiments, except for the driving transistor, other transistors may be P-type transistors, or some transistors may be P-type transistors and some transistors may be N-type transistors.

[0052] The first control signal terminal provides a first control signal, the second control signal terminal provides a second control signal, the third control signal terminal provides a third control signal, the light-emitting control signal terminal provides a light-emitting control signal, the input signal terminal provides an input signal, the first power signal terminal provides a first power signal, the second power signal terminal provides a second power signal, and the ground signal terminal provides a ground signal. The first control signal, the second control signal, the third control signal and the light-emitting control signal are periodic pulse signals, the input signal is a pulse signal, the first power signal, the second power signal and the ground signal are all DC signals, and the voltage value of the first power signal is greater than the voltage value of the second power signal. The voltage value of the ground signal is 0 volts. One working cycle of the pixel unit brightness compensation circuit may include the following multiple time periods: a first time period, a second time period and a third time period.

[0053] (I) The first period (t1 period)

[0054] The first control signal is an invalid signal, the second control signal is a valid signal, the third control signal is a valid signal, and the light emitting control signal is an invalid signal.

[0055] The first control signal and the light emitting control signal are invalid signals, and the first transistor, the third transistor and the fourth transistor are turned off.

[0056] The second control signal and the third control signal are valid signals, the fifth transistor and the sixth transistor are turned on, the voltage values ​​of the fourth node and the fifth node are set to 0V, and U N4 =U N5 =0 V. That is, the voltages of the second electrode of the storage capacitor and the cathode of the light emitting diode are reset.

[0057] (II) The second period (T2 period)

[0058] The first control signal is a valid signal, the second control signal is an invalid signal, the third control signal is an invalid signal, and the light emitting control signal is an invalid signal.

[0059] The second control signal, the third control signal and the light emitting control signal are invalid signals, and the third transistor, the fourth transistor, the fifth transistor and the sixth transistor are turned off.

[0060] The first control signal is a valid signal, and the voltage value of the input signal is U VDATA The voltage value U transmitted to the first node N1 =U VDATA .U VDATA The voltage value of the first node is transmitted to the second node, that is, U N2 =U VDATA -Vth, Vth is the threshold voltage of the driving transistor.

[0061] (III) The third period (T3 period)

[0062] The first control signal is an invalid signal, the second control signal is an invalid signal, the third control signal is a valid signal, and the light emitting control signal is a valid signal.

[0063] The first control signal and the second control signal are invalid signals, and the first transistor and the fifth transistor are turned off.

[0064] The light emitting control signal is a valid signal, and the third transistor and the fourth transistor are turned on. The voltage value U of the first node N1 =U VDATA , U VDATA The third transistor, the driving transistor and the fourth transistor are turned on, and a current path is formed between the first power signal terminal and the second power signal terminal. Due to the existence of voltage drop (IRdrop), the actual voltage value U of the cathode of the light-emitting diode on the display panel is N4 Slightly higher than the design voltage value U when the second power signal is generated ELVSS Moreover, the actual voltage value of the cathode of the light-emitting diode in the central area of ​​the display panel is higher than the actual voltage value of the cathode of the light-emitting diode in the peripheral area of ​​the display panel.

[0065] The third control signal is a valid signal, and the sixth transistor is turned on. The voltage of the fifth node changes from 0V to the actual voltage value U of the cathode of the light-emitting diode (the fourth node). N4 , due to the existence of voltage drop (IR Drop), U N4 >U ELVSS , U ELVSS is the designed voltage value when the second power signal is generated. The voltage difference between the two electrodes of the storage capacitor will not jump, and the voltage value of the first node changes from U VDATA Change to U VDATA +U N4 , that is, U N1=U VDATA +U N4 , the voltage value of the cathode (fourth node) of the light-emitting diode is U N4 When the driving module conducts the current path between the third node and the second node, the voltage value of the first node is transmitted to the second node, that is, U N2 =U VDATA +U N4 -Vth, Vth is the threshold voltage of the driving transistor. The voltage difference ΔU between the anode and cathode of the light-emitting diode is: ΔU = U N2 -U N4 =(U VDATA +U N4 -Vth)-U N4 =U VDATA -Vth.

[0066] The voltage difference ΔU between the anode and cathode of the LED no longer contains the actual voltage value of the cathode of the LED (U N4 ), that is, the current flowing through the LED has nothing to do with the actual voltage value of the cathode of the LED, thus compensating for the voltage drop (IR Drop) of the cathode of the LED. The brightness compensation circuit is a compensation at the pixel unit level, with high compensation accuracy and good real-time performance, and is suitable for all grayscale conditions, greatly improving the brightness uniformity of the display panel.

[0067] The present disclosure provides a brightness compensation method for the above pixel unit brightness compensation circuit. Figure 5 As shown, an embodiment of the present disclosure provides a brightness compensation method for a pixel unit brightness compensation circuit, comprising:

[0068] Step S10, the first control module sets the voltage value of the fifth node to 0V in the first time period, and the second control module sets the voltage value of the fourth node to 0V in the first time period;

[0069] Step S20, the input module transmits the input signal voltage value of the input signal terminal to the first node within the second period, and the driving module transmits the voltage value of the first node to the second node within the second period;

[0070] Step S30, the first light-emitting control module conducts the current path between the first power signal terminal and the third node in the third time period, the second light-emitting control module conducts the current path between the second power signal terminal and the fourth node in the third time period, the second control module transmits the voltage value of the fourth node to the fifth node in the third time period, the energy storage module transmits the voltage value of the fourth node to the first node, the driving module conducts the current path between the third node and the second node in the third time period and transmits the voltage value of the first node to the second node, and the light-emitting module emits light in the third time period.

[0071] In the brightness compensation method of the pixel unit brightness compensation circuit provided by the above embodiment, the first control module and the second control module respectively set the voltage values ​​of the fifth node and the fourth node to 0V in the first period, that is, the second pole of the storage capacitor and the cathode of the light-emitting diode are reset. The input module transmits the input signal voltage value to the first node in the second period. In the third period, the second control module transmits the voltage value of the fourth node to the fifth node, the voltage difference between the two poles of the storage capacitor will not jump, the voltage value of the cathode of the light-emitting diode (the fourth node) is transmitted to the first node through the storage capacitor, the first light-emitting control module, the driving module and the second light-emitting control module conduct the current path flowing through the light-emitting diode, and the voltage value of the first node is transmitted to the second node, so that the voltage difference between the anode and the cathode of the light-emitting diode no longer includes the actual voltage value of the cathode of the light-emitting diode, that is, the current flowing through the light-emitting diode is irrelevant to the actual voltage value of the cathode of the light-emitting diode, thereby compensating the voltage drop (IR Drop) of the cathode of the light-emitting diode. The brightness compensation method is a compensation at the pixel unit level, with high compensation accuracy and good real-time performance, and is suitable for all grayscale conditions, greatly improving the brightness uniformity of the display panel.

[0072] In some exemplary embodiments, the light-emitting diode includes an OLED (Organic Light-Emitting Diode).

[0073] In some exemplary embodiments, the input module includes a first transistor T1, a control electrode of the first transistor is connected to a first control signal terminal S1, a first electrode of the first transistor is connected to an input signal terminal VDATA, and a second electrode of the first transistor is connected to a first node N1.

[0074] In some exemplary embodiments, the driving module includes a driving transistor T2, a control electrode of the driving transistor is connected to the first node N1, a first electrode of the driving transistor is connected to the third node N3, and a second electrode of the driving transistor is connected to the second node N2.

[0075] In some exemplary embodiments, the first light emitting control module includes a third transistor T3, a control electrode of the third transistor is connected to the light emitting control signal terminal EM, a first electrode of the third transistor is connected to the first power signal terminal ELVDD, and a second electrode of the third transistor is connected to a third node N3.

[0076] In some exemplary embodiments, the second light emitting control module includes a fourth transistor T4, a control electrode of the fourth transistor is connected to the light emitting control signal terminal EM, a first electrode of the fourth transistor is connected to a fourth node N4, and a second electrode of the fourth transistor is connected to the second power signal terminal ELVSS.

[0077] In some exemplary embodiments, the first control module includes a fifth transistor T5, a control electrode of the fifth transistor is connected to the second control signal terminal S2, a first electrode of the fifth transistor is connected to the ground signal terminal GND, and a second electrode of the fifth transistor is connected to a fifth node N5.

[0078] In some exemplary embodiments, the second control module includes a sixth transistor T6, a control electrode of the sixth transistor is connected to the third control signal terminal S3, a first electrode of the sixth transistor is connected to the fifth node, and a second electrode of the sixth transistor is connected to the fourth node N4.

[0079] In some exemplary embodiments, the first control signal terminal S1 provides a first control signal, the second control signal terminal S2 provides a second control signal, the third control signal terminal S3 provides a third control signal, the light-emitting control signal terminal EM provides a light-emitting control signal, the input signal terminal VDATA provides an input signal, the voltage value of the input signal is related to the grayscale value of the pixel unit, the first power signal terminal ELVDD provides a first power signal, the second power signal terminal ELVSS provides a second power signal, and the ground signal terminal GND provides a ground signal. The first control signal, the second control signal, the third control signal and the light-emitting control signal are periodic pulse signals, the input signal is a pulse signal, the first power signal, the second power signal and the ground signal are all DC signals, and the voltage value of the first power signal is greater than the voltage value of the second power signal. The voltage value of the ground signal is 0 volts.

[0080] In some exemplary embodiments, the first control signal is a valid signal in the second time period, and is an invalid signal in other time periods; the second control signal is a valid signal in the first time period, and is an invalid signal in other time periods; the third control signal is a valid signal in the first time period and the third time period, and is an invalid signal in other time periods; the light-emitting control signal is a valid signal in the third time period, and is an invalid signal in other time periods; wherein the valid signal is a voltage signal that turns on the transistor, and the invalid signal is a voltage signal that turns off the transistor.

[0081] The embodiment of the present disclosure further provides a display device, comprising the above-mentioned pixel unit brightness compensation circuit.

[0082] The display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc. Other essential components of the display device are well understood by those skilled in the art, and are not described in detail herein, nor should they be used as limitations on the present invention.

[0083] Although the embodiments disclosed in this application are as above, the contents described are only embodiments adopted for facilitating the understanding of this application and are not intended to limit the present invention. Any technician in the field to which the present invention belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the present invention, but the patent protection scope of the present invention shall still be subject to the scope defined in the attached claims.

Claims

1. A pixel unit brightness compensation circuit, include: An input module, a driving module, a light emitting module, a first light emitting control module, a second light emitting control module, an energy storage module, a first control module, and a second control module; The input module is connected to the input signal terminal, the first control signal terminal and the first node respectively, and is configured to transmit the input signal voltage value of the input signal terminal to the first node within the second time period; The driving module is connected to the first node, the second node and the third node respectively, and is configured to transmit the voltage value of the first node to the second node in the second period and the third period, and to conduct the current path between the third node and the second node in the third period; The driving module comprises a driving transistor, wherein a control electrode of the driving transistor is connected to a first node, a first electrode of the driving transistor is connected to a third node, and a second electrode of the driving transistor is connected to a second node; The first light-emitting control module is connected to the first power signal terminal, the light-emitting control signal terminal and the third node respectively, and is configured to conduct a current path between the first power signal terminal and the third node in a third time period; The second light-emitting control module is connected to the second power signal terminal, the light-emitting control signal terminal and the fourth node respectively, and is configured to conduct a current path between the second power signal terminal and the fourth node in a third time period; The light emitting module comprises a light emitting diode, an anode of the light emitting diode is connected to the second node, a cathode of the light emitting diode is connected to the fourth node, and the light emitting diode emits light in a third time period; The energy storage module includes a storage capacitor, a first electrode of the storage capacitor is connected to the first node, and a second electrode of the storage capacitor is connected to the fifth node; The first control module is connected to the ground signal terminal, the second control signal terminal and the fifth node respectively, and is configured to set the voltage value of the fifth node to 0V in a first time period; The second control module is connected to the fifth node, the third control signal terminal and the fourth node respectively, and is configured to set the voltage value of the fourth node to 0V in the first time period and transfer the voltage value of the fourth node to the fifth node in the third time period.

2. The circuit according to claim 1, Features: The input module comprises a first transistor, a control electrode of the first transistor is connected to a first control signal terminal, a first electrode of the first transistor is connected to an input signal terminal, and a second electrode of the first transistor is connected to a first node; The first light emitting control module comprises a third transistor, a control electrode of the third transistor is connected to the light emitting control signal terminal, a first electrode of the third transistor is connected to the first power signal terminal, and a second electrode of the third transistor is connected to the third node; The second light emitting control module comprises a fourth transistor, a control electrode of the fourth transistor is connected to the light emitting control signal terminal, a first electrode of the fourth transistor is connected to the fourth node, and a second electrode of the fourth transistor is connected to the second power supply signal terminal.

3. The circuit according to claim 2, Features: The first control module includes a fifth transistor, a control electrode of the fifth transistor is connected to the second control signal terminal, a first electrode of the fifth transistor is connected to the ground signal terminal, and a second electrode of the fifth transistor is connected to the fifth node; The second control module includes a sixth transistor, a control electrode of the sixth transistor is connected to the third control signal terminal, a first electrode of the sixth transistor is connected to the fifth node, and a second electrode of the sixth transistor is connected to the fourth node.

4. The circuit according to claim 3, Features: The first control signal terminal provides a first control signal, the second control signal terminal provides a second control signal, the third control signal terminal provides a third control signal, the light-emitting control signal terminal provides a light-emitting control signal, the input signal terminal provides an input signal, the first power signal terminal provides a first power signal, the second power signal terminal provides a second power signal, and the ground signal terminal provides a ground signal; The first control signal, the second control signal, the third control signal and the light-emitting control signal are periodic pulse signals, the input signal is a pulse signal, the first power signal, the second power signal and the ground signal are all DC signals, the voltage value of the first power signal is greater than the voltage value of the second power signal; the voltage value of the ground signal is 0 volts.

5. The circuit according to claim 4, Features: The first control signal is a valid signal in the second time period, and is an invalid signal in other time periods; the second control signal is a valid signal in the first time period, and is an invalid signal in other time periods; the third control signal is a valid signal in the first time period and the third time period, and is an invalid signal in other time periods; the light-emitting control signal is a valid signal in the third time period, and is an invalid signal in other time periods; wherein the valid signal is a voltage signal that turns on the transistor, and the invalid signal is a voltage signal that turns off the transistor.

6. The circuit according to any one of claims 1 to 5, Features: The light emitting diode comprises an organic light emitting diode.

7. A brightness compensation method for a pixel unit brightness compensation circuit according to any one of claims 1 to 6, include: The first control module sets the voltage value of the fifth node to 0V in the first time period, and the second control module sets the voltage value of the fourth node to 0V in the first time period; The input module transmits the input signal voltage value of the input signal terminal to the first node in the second period, and the driving module transmits the voltage value of the first node to the second node in the second period; The first light-emitting control module conducts the current path between the first power signal terminal and the third node in the third time period, the second light-emitting control module conducts the current path between the second power signal terminal and the fourth node in the third time period, the second control module transmits the voltage value of the fourth node to the fifth node in the third time period, the energy storage module transmits the voltage value of the fourth node to the first node, the driving module conducts the current path between the third node and the second node in the third time period and transmits the voltage value of the first node to the second node, and the light-emitting module emits light in the third time period.

8. The method according to claim 7, Features: The first control signal terminal provides a first control signal, the second control signal terminal provides a second control signal, the third control signal terminal provides a third control signal, the light-emitting control signal terminal provides a light-emitting control signal, the input signal terminal provides an input signal, the first power signal terminal provides a first power signal, the second power signal terminal provides a second power signal, and the ground signal terminal provides a ground signal; The first control signal, the second control signal, the third control signal and the light-emitting control signal are periodic pulse signals, the input signal is a pulse signal, the first power signal, the second power signal and the ground signal are all DC signals, the voltage value of the first power signal is greater than the voltage value of the second power signal; the voltage value of the ground signal is 0 volts.

9. The method according to claim 8, Features: The first control signal is a valid signal in the second time period, and is an invalid signal in other time periods; the second control signal is a valid signal in the first time period, and is an invalid signal in other time periods; the third control signal is a valid signal in the first time period and the third time period, and is an invalid signal in other time periods; the light-emitting control signal is a valid signal in the third time period, and is an invalid signal in other time periods; wherein the valid signal is a voltage signal that turns on the transistor, and the invalid signal is a voltage signal that turns off the transistor.

10. A display device, include: The pixel unit brightness compensation circuit according to any one of claims 1 to 6.

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