Pixel module and circuit beneficial to brightness stability

Abstract

The invention discloses a pixel module and circuit beneficial to brightness stability, and relates to the technical field of electronic circuits, the pixel module comprises a first switch unit, a first data storage unit and a first driving unit which are connected in sequence; the second switch unit, the second data storage unit and the second driving unit are connected in sequence; the reset unit is respectively connected with the first driving unit and the second driving unit; and the light-emitting unit is connected with the first driving unit and the second driving unit. The pixel circuit is designed on the basis of the transistor, the light-emitting diode and the capacitor, the influence of threshold voltage deviation of the driving TFT on the brightness of the OLED can be compensated, and the actual requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a pixel module and a circuit which are beneficial to brightness stability. Background Art

[0002] AMOLED is a new generation of display technology. Compared with traditional LCD (Liquid Crystal Display), it has higher contrast, faster response speed and wider viewing angle, and is widely used in smart phones and TV fields. In terms of driving mode, unlike LCD, AMOLED is current-driven and is more sensitive to the electrical variation of TFT (Thin Film Transistor, color LCD screen). The Vth uniformity of the panel and the drift of Vth under stress both affect the accuracy and uniformity of the picture display.

[0003] Therefore, in order to meet practical needs, a pixel structure design that is beneficial to brightness stability is now provided. Summary of the invention

[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide a pixel module and circuit that is beneficial to brightness stability. Based on transistors, light-emitting diodes and capacitors, pixel circuit design is carried out to compensate for the influence of the threshold voltage offset of the driving TFT on the brightness of the OLED and meet actual needs.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present application provides a pixel module that is beneficial to brightness stability, the pixel module comprising:

[0007] A first switch unit, a first data storage unit and a first drive unit connected in sequence;

[0008] A second switch unit, a second data storage unit and a second drive unit connected in sequence;

[0009] a reset unit, wherein the reset unit is connected to the first driving unit and the second driving unit respectively;

[0010] A light emitting unit, wherein the light emitting unit is connected to the first driving unit and the second driving unit respectively.

[0011] On the basis of the above technical solution, the first driving unit includes a first transistor;

[0012] The gate of the first transistor is respectively connected to the output end of the first switch unit and the input end of the first data storage unit;

[0013] One end of the first transistor is connected to a voltage source, and the other end is respectively connected to the output end of the first data storage unit and the input end of the light emitting unit.

[0014] On the basis of the above technical solution, the first switch unit includes a third transistor;

[0015] The gate of the third transistor is connected to a write signal;

[0016] One end of the third transistor serves as a first data receiving end, and the other end is connected to the gate of the first transistor and the input end of the first data storage unit.

[0017] On the basis of the above technical solution, the first data storage unit includes a first capacitor;

[0018] One end of the first capacitor is connected to one end of the third transistor and the gate of the first transistor respectively, serving as an input end of the first data storage unit;

[0019] The other end of the first capacitor is connected to one end of the first transistor and the input end of the light emitting unit to serve as the output end of the first data storage unit.

[0020] On the basis of the above technical solution, the light emitting unit includes a first light emitting diode;

[0021] The input end of the first light emitting diode is connected to one end of the first transistor and the output end of the first data storage unit to serve as the input end of the light emitting unit;

[0022] are respectively connected to the output end of the first switch unit and the input end of the first data storage unit;

[0023] One end of the first transistor is connected to a voltage source, and the other end is respectively connected to the output end of the first data storage unit and the input end of the light emitting unit.

[0024] On the basis of the above technical solution, the reset unit includes a fifth transistor;

[0025] The gate of the fifth transistor is connected to the write signal;

[0026] One end of the fifth transistor is connected to a reference voltage, and the other end is connected to the output end of the first data storage unit, the output end of the second data storage unit, the input end of the light emitting unit, one end of the first driving unit and one end of the second driving unit.

[0027] On the basis of the above technical solution, the second driving unit includes a second transistor;

[0028] The gate of the second transistor is respectively connected to the output end of the second switch unit and the input end of the second data storage unit;

[0029] One end of the second transistor is connected to a voltage source, and the other end is respectively connected to the output end of the second data storage unit and the input end of the light emitting unit.

[0030] On the basis of the above technical solution, the second switch unit includes a fourth transistor;

[0031] The gate of the fourth transistor is connected to a write signal;

[0032] One end of the fourth transistor serves as a second data receiving end, and the other end is connected to the gate of the second transistor and the input end of the second data storage unit.

[0033] On the basis of the above technical solution, the second data storage unit includes a second capacitor;

[0034] One end of the second capacitor is connected to one end of the fourth transistor and the gate of the second transistor respectively, serving as an input end of the second data storage unit;

[0035] The other end of the second capacitor is connected to one end of the second transistor and the input end of the light emitting unit to serve as the output end of the first data storage unit.

[0036] In a second aspect, the present application provides a pixel circuit that is beneficial to brightness stability, the pixel circuit comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a first capacitor, a second capacitor, and a first light-emitting diode;

[0037] The gate of the third transistor is connected to a write signal, one end of the third transistor serves as a first data receiving end, and the other end is connected to the gate of the first transistor and the input end of the first capacitor;

[0038] One end of the first transistor is connected to a voltage source, and the other end is connected to the output end of the first capacitor and the input end of the first light emitting diode respectively;

[0039] The output end of the first light emitting diode is grounded;

[0040] The gate of the fifth transistor is connected to the write signal;

[0041] One end of the fifth transistor is connected to a reference voltage, and the other end is connected to the output end of the first capacitor, the output end of the second capacitor, the input end of the first light-emitting diode, one end of the first transistor, and one end of the second transistor;

[0042] The gate of the fourth transistor is connected to the write signal, one end of the fourth transistor serves as a second data receiving end, and the other end is connected to the gate of the second transistor and the input end of the second capacitor;

[0043] One end of the second transistor is connected to a voltage source, and the other end is respectively connected to the output end of the second capacitor and the input end of the first light emitting diode.

[0044] Compared with the prior art, the advantages of the present invention are:

[0045] The present invention designs a pixel circuit based on transistors, light emitting diodes and capacitors, and can compensate for the influence of the threshold voltage shift of the driving TFT on the brightness of the OLED, thus meeting practical needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 A schematic diagram of a circuit structure of a pixel module that is beneficial to brightness stability according to an embodiment of the present invention;

[0048] Figure 2 A schematic diagram of a circuit architecture partition of a pixel module that is beneficial to brightness stability according to an embodiment of the present invention;

[0049] Figure 3 A schematic diagram of a circuit structure of a pixel module that is beneficial to brightness stability according to an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of the amplitude of a pixel module that is beneficial to brightness stability according to an embodiment of the present invention;

[0051] Figure 5 A signal timing diagram of a pixel module that is beneficial to brightness stability according to an embodiment of the present invention;

[0052] Figure 6 A schematic diagram of states and values ​​of a pixel module that is beneficial to brightness stability according to an embodiment of the present invention;

[0053] Figure 7 A schematic diagram of signal timing comparison of a pixel module that is beneficial to brightness stability according to an embodiment of the present invention;

[0054] Figure 8 FIG. 1 is a schematic diagram of a conventional pixel circuit of a pixel module that is beneficial to brightness stability according to an embodiment of the present invention. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0056] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0057] The embodiment of the present application provides a pixel module and circuit that are beneficial to brightness stability. The pixel circuit design is based on transistors, light-emitting diodes and capacitors, which can compensate for the impact of the threshold voltage offset of the driving TFT on the brightness of the OLED and meet actual needs.

[0058] In order to achieve the above technical effects, the overall idea of ​​this application is as follows:

[0059] A pixel module that is beneficial to brightness stability, the pixel module comprising:

[0060] A first switch unit, a first data storage unit and a first drive unit connected in sequence;

[0061] A second switch unit, a second data storage unit and a second drive unit connected in sequence;

[0062] a reset unit, wherein the reset unit is connected to the first driving unit and the second driving unit respectively;

[0063] A light emitting unit, wherein the light emitting unit is connected to the first driving unit and the second driving unit respectively.

[0064] The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings.

[0065] First, see Figures 1 to 8 As shown, an embodiment of the present application provides a pixel module that is beneficial to brightness stability, and the pixel module includes:

[0066] A first switch unit, a first data storage unit and a first drive unit connected in sequence;

[0067] A second switch unit, a second data storage unit and a second drive unit connected in sequence;

[0068] a reset unit, wherein the reset unit is connected to the first driving unit and the second driving unit respectively;

[0069] A light emitting unit, wherein the light emitting unit is connected to the first driving unit and the second driving unit respectively.

[0070] In the embodiment of the present application, a pixel circuit is designed based on transistors, light-emitting diodes and capacitors, which can compensate for the influence of the threshold voltage offset of the driving TFT on the brightness of the OLED and meet actual needs.

[0071] Further, the first driving unit includes a first transistor;

[0072] The gate of the first transistor is respectively connected to the output end of the first switch unit and the input end of the first data storage unit;

[0073] One end of the first transistor is connected to a voltage source, and the other end is respectively connected to the output end of the first data storage unit and the input end of the light emitting unit.

[0074] Further, the first switch unit includes a third transistor;

[0075] The gate of the third transistor is connected to a write signal;

[0076] One end of the third transistor serves as a first data receiving end, and the other end is connected to the gate of the first transistor and the input end of the first data storage unit.

[0077] Further, the first data storage unit includes a first capacitor;

[0078] One end of the first capacitor is connected to one end of the third transistor and the gate of the first transistor respectively, serving as an input end of the first data storage unit;

[0079] The other end of the first capacitor is connected to one end of the first transistor and the input end of the light emitting unit to serve as the output end of the first data storage unit.

[0080] Further, the light emitting unit includes a first light emitting diode;

[0081] The input end of the first light emitting diode is connected to one end of the first transistor and the output end of the first data storage unit to serve as the input end of the light emitting unit;

[0082] are respectively connected to the output end of the first switch unit and the input end of the first data storage unit;

[0083] One end of the first transistor is connected to a voltage source, and the other end is respectively connected to the output end of the first data storage unit and the input end of the light emitting unit.

[0084] Further, the reset unit includes a fifth transistor;

[0085] The gate of the fifth transistor is connected to the write signal;

[0086] One end of the fifth transistor is connected to a reference voltage, and the other end is connected to the output end of the first data storage unit, the output end of the second data storage unit, the input end of the light emitting unit, one end of the first driving unit and one end of the second driving unit.

[0087] Further, the second driving unit includes a second transistor;

[0088] The gate of the second transistor is respectively connected to the output end of the second switch unit and the input end of the second data storage unit;

[0089] One end of the second transistor is connected to a voltage source, and the other end is respectively connected to the output end of the second data storage unit and the input end of the light emitting unit.

[0090] Further, the second switch unit includes a fourth transistor;

[0091] The gate of the fourth transistor is connected to a write signal;

[0092] One end of the fourth transistor serves as a second data receiving end, and the other end is connected to the gate of the second transistor and the input end of the second data storage unit.

[0093] Further, the second data storage unit includes a second capacitor;

[0094] One end of the second capacitor is connected to one end of the fourth transistor and the gate of the second transistor respectively, serving as an input end of the second data storage unit;

[0095] The other end of the second capacitor is connected to one end of the second transistor and the input end of the light emitting unit to serve as the output end of the first data storage unit.

[0096] Based on the technical solution of the embodiment of the present application, combined with the accompanying drawings of the specification Figure 1 To explain in detail:

[0097] Figure 1 is a schematic diagram of the circuit architecture. Figure 2 This is a schematic diagram of the circuit architecture partition. Figure 3 is a schematic diagram of the circuit structure. Figure 4 is a schematic diagram of amplitude, Figure 5 is the signal timing diagram, Figure 6 is a schematic diagram of the state and value. Figure 7 It is a schematic diagram of signal timing comparison. Figure 8 is a schematic diagram of a traditional pixel circuit;

[0098] In the drawings of the specification: T1a is a first transistor, T1b is a second transistor, T2a is a third transistor, T2b is a fourth transistor, T3 is a fifth transistor, Cst1 is a first capacitor, Cst2 is a second capacitor, and LED is a first light emitting diode;

[0099] Data1 is a first data signal corresponding to the first data receiving end;

[0100] Data2 is a second data signal corresponding to the second data receiving end;

[0101] WR(n) is the write signal;

[0102] VDD is the voltage source;

[0103] Verf is the reference voltage;

[0104] gnd is ground.

[0105] The pixel circuit of traditional AMOLED / mini-led / micro-led active light-emitting display is as follows Figure 8 As shown, the pixel circuit architecture of the present invention is as follows Figure 1 As shown, this application includes:

[0106] A first switching unit, a second switching unit, a first data storage unit, a second data storage unit, a first driving unit, a second driving unit, a reset unit, and a light emitting unit.

[0107] The function of the first switch unit is to selectively store the data signal in the first data storage unit;

[0108] The function of the second switch unit is to selectively store the data signal in the second data storage unit;

[0109] The first data storage unit is used to store a first data signal;

[0110] The second data storage unit is used to store the second data signal;

[0111] The first driving unit and the second driving unit function to alternately generate current as a current source for the light emitting unit.

[0112] The reset unit is used to reset the anode voltage of the OLED (Organic Light-Emitting Diode).

[0113] The function of the light emitting unit is to generate light within the pixel.

[0114] Among them, within one frame time, the first drive unit and the second drive unit work alternately. Within 1 frame time, the working time of the first drive unit and the second drive unit each accounts for half. When the first drive unit is working, the internal TFT is affected by PBTS (positive bias temperature stress) and current stress, and the threshold voltage will gradually become positively biased. The TFT of the second drive unit will be affected by NBTS (negative bias temperature radiation stress), and Vth will shift negatively. The threshold voltage of the TFT of the second drive unit will gradually return to its initial state. When the second drive unit is working, the internal TFT is affected by PBTS and current stress, and the threshold voltage will gradually become positively biased. The TFT of the first drive unit will be affected by NBTS, and Vth will shift negatively. The threshold voltage of the TFT of the first drive unit will gradually return to its initial state.

[0115] It should be noted that the technical solution of the embodiment of the present application is mainly divided into four stages when working: 1. the first data writing stage, 2. the first light-on stage, 3. the second data writing stage, 4. the second light-on stage;

[0116] First data writing stage: WR rises to high potential, Data1 data is written to the first storage capacitor, the S point potential is reset by Vref, the potential of Vgs1 is 5V; the negative potential of Data2 is written to the second storage capacitor, the potential of Vgs2 is -6V.

[0117] The first lighting stage: the potentials of G1, G2 and S point rise simultaneously, T1a generates current; T1b is affected by NBTS stress.

[0118] Second data writing stage: WR rises to high potential, Data2 data is written to the second storage capacitor, the S point potential is reset by Vref, the potential of Vgs2 is 5V; the negative potential of Data1 is written to the second storage capacitor, and the potential of Vgs1 is -6V.

[0119] The second lighting stage: the potentials of G1, G2 and S point rise simultaneously, T1b generates current; T1a is affected by NBTS stress.

[0120] In terms of driving mode, unlike LCD, AMOLED is current driven and is more sensitive to the electrical variation of TFT. The Vth uniformity of the panel and the drift of Vth under stress both affect the accuracy and uniformity of the picture display. In order to solve this problem, a pixel compensation circuit is introduced. The present invention proposes a novel 5T2C pixel compensation circuit, which can compensate for the influence of the threshold voltage offset of the driving TFT on the brightness of the OLED.

[0121] It should be noted that the technical solution of the embodiment of the present application can be applied to OLED, mini-LED and micro-LED for display.

[0122] To sum up, in terms of driving mode, unlike LCD, AMOLED is current-driven and is more sensitive to electrical variations in TFT. The Vth uniformity of the panel and the drift of Vth under stress both affect the accuracy and uniformity of the picture display. In order to solve this problem, a pixel compensation circuit is introduced. This application proposes a new 5T2C pixel compensation circuit that can compensate for the impact of the threshold voltage offset of the driving TFT on the brightness of the OLED.

[0123] Second, refer to Figure 3 As shown, an embodiment of the present application provides a pixel circuit that is beneficial to brightness stability, the pixel circuit comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a first capacitor, a second capacitor, and a first light emitting diode;

[0124] The gate of the third transistor is connected to a write signal, one end of the third transistor serves as a first data receiving end, and the other end is connected to the gate of the first transistor and the input end of the first capacitor;

[0125] One end of the first transistor is connected to a voltage source, and the other end is connected to the output end of the first capacitor and the input end of the first light emitting diode respectively;

[0126] The output end of the first light emitting diode is grounded;

[0127] The gate of the fifth transistor is connected to the write signal;

[0128] One end of the fifth transistor is connected to a reference voltage, and the other end is connected to the output end of the first capacitor, the output end of the second capacitor, the input end of the first light-emitting diode, one end of the first transistor, and one end of the second transistor;

[0129] The gate of the fourth transistor is connected to the write signal, one end of the fourth transistor serves as a second data receiving end, and the other end is connected to the gate of the second transistor and the input end of the second capacitor;

[0130] One end of the second transistor is connected to a voltage source, and the other end is connected to the output end of the second capacitor and the input end of the first light emitting diode.

[0131] In the embodiment of the present application, the pixel circuit design is based on transistors, light-emitting diodes and capacitors, which can compensate for the influence of the threshold voltage offset of the driving TFT on the brightness of the OLED and meet the actual needs.

[0132] The pixel circuit that is beneficial to brightness stability provided in the embodiment of the present application and the pixel module that is beneficial to brightness stability mentioned in the first aspect have the same technical solutions, technical problems solved, and technical effects obtained at the technical principle level, and will not be elaborated here.

[0133] In the description of the present application, it should be noted that the terms "upper", "lower", etc. 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. 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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0134] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0135] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A pixel module that is beneficial to brightness stability, characterized in that: The pixel module comprises: A first switch unit, a first data storage unit and a first drive unit connected in sequence; A second switch unit, a second data storage unit and a second drive unit connected in sequence; a reset unit, wherein the reset unit is connected to the first driving unit and the second driving unit respectively; A light emitting unit, wherein the light emitting unit is connected to the first driving unit and the second driving unit respectively.

2. The pixel module for stabilizing brightness according to claim 1, wherein: The first driving unit includes a first transistor; The gate of the first transistor is respectively connected to the output end of the first switch unit and the input end of the first data storage unit; One end of the first transistor is connected to a voltage source, and the other end is respectively connected to the output end of the first data storage unit and the input end of the light emitting unit.

3. The pixel module for stabilizing brightness as claimed in claim 2, characterized in that: The first switch unit includes a third transistor; The gate of the third transistor is connected to a write signal; One end of the third transistor serves as a first data receiving end, and the other end is connected to the gate of the first transistor and the input end of the first data storage unit.

4. The pixel module for stabilizing brightness as claimed in claim 3, characterized in that: The first data storage unit includes a first capacitor; One end of the first capacitor is connected to one end of the third transistor and the gate of the first transistor respectively, serving as an input end of the first data storage unit; The other end of the first capacitor is connected to one end of the first transistor and the input end of the light emitting unit to serve as the output end of the first data storage unit.

5. The pixel module for stabilizing brightness as claimed in claim 4, characterized in that: The light emitting unit comprises a first light emitting diode; The input end of the first light emitting diode is connected to one end of the first transistor and the output end of the first data storage unit to serve as the input end of the light emitting unit; are respectively connected to the output end of the first switch unit and the input end of the first data storage unit; One end of the first transistor is connected to a voltage source, and the other end is respectively connected to the output end of the first data storage unit and the input end of the light emitting unit.

6. The pixel module for stabilizing brightness as claimed in claim 5, characterized in that: The reset unit includes a fifth transistor; The gate of the fifth transistor is connected to the write signal; One end of the fifth transistor is connected to a reference voltage, and the other end is connected to the output end of the first data storage unit, the output end of the second data storage unit, the input end of the light emitting unit, one end of the first driving unit and one end of the second driving unit.

7. The pixel module for stabilizing brightness according to claim 6, wherein: The second driving unit includes a second transistor; The gate of the second transistor is respectively connected to the output end of the second switch unit and the input end of the second data storage unit; One end of the second transistor is connected to a voltage source, and the other end is respectively connected to the output end of the second data storage unit and the input end of the light emitting unit.

8. The pixel module for stabilizing brightness according to claim 7, wherein: The second switch unit includes a fourth transistor; The gate of the fourth transistor is connected to a write signal; One end of the fourth transistor serves as a second data receiving end, and the other end is connected to the gate of the second transistor and the input end of the second data storage unit.

9. The pixel module for stabilizing brightness as claimed in claim 8, characterized in that: The second data storage unit includes a second capacitor; One end of the second capacitor is connected to one end of the fourth transistor and the gate of the second transistor respectively, serving as an input end of the second data storage unit; The other end of the second capacitor is connected to one end of the second transistor and the input end of the light emitting unit to serve as the output end of the first data storage unit.

10. A pixel circuit that is beneficial to brightness stability, characterized in that: The pixel circuit includes a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a first capacitor, a second capacitor and a first light emitting diode; The gate of the third transistor is connected to a write signal, one end of the third transistor serves as a first data receiving end, and the other end is connected to the gate of the first transistor and the input end of the first capacitor; One end of the first transistor is connected to a voltage source, and the other end is connected to the output end of the first capacitor and the input end of the first light emitting diode respectively; The output end of the first light emitting diode is grounded; The gate of the fifth transistor is connected to the write signal; One end of the fifth transistor is connected to a reference voltage, and the other end is connected to the output end of the first capacitor, the output end of the second capacitor, the input end of the first light-emitting diode, one end of the first transistor, and one end of the second transistor; The gate of the fourth transistor is connected to the write signal, one end of the fourth transistor serves as a second data receiving end, and the other end is connected to the gate of the second transistor and the input end of the second capacitor; One end of the second transistor is connected to a voltage source, and the other end is respectively connected to the output end of the second capacitor and the input end of the first light emitting diode.

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