Pixel circuit, control method thereof and display panel

Abstract

The invention discloses a pixel circuit and a control method thereof and a display panel, and mainly relates to the technical field of display, the pixel circuit comprises a data line, a scanning line, a first light-emitting unit, a second light-emitting unit and a control unit, the data line is connected with the first light-emitting unit, the second light-emitting unit and the control unit at the same time, and the scanning line is connected with the data line. The scanning lines are connected through the control unit, and the control unit is connected with the first light-emitting unit and the second light-emitting unit. The control unit is used for comparing the data voltage with a preset standard voltage, and when the data voltage is greater than the preset standard voltage, the first light emitting unit is controlled to work; when the data voltage is smaller than the preset standard voltage, the second light-emitting unit is controlled to work; through the design, the service life of the first light-emitting unit and the second light-emitting unit is prolonged.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a pixel circuit and a control method thereof, and a display panel. Background Art

[0002] The pixel circuit of the traditional OLED display panel is composed of 2T1C circuit, see Figure 1 The 2T1C circuit includes two active switches and a storage capacitor. Reference numeral 10 represents a switching transistor, 20 represents a driver transistor, 30 represents a storage capacitor, 40 represents an organic light-emitting diode (OLED), 50 represents an anode voltage input terminal, and 60 represents a cathode voltage input terminal. Scan line VGate activates the switching transistor, and data voltage Vdata charges the storage capacitor. During the light-emitting period, the switching transistor is turned off, and the voltage stored on the capacitor keeps the driver transistor on, conducting current and causing the OLED to emit light. Currently, a common technique for OLEDs is to precisely control the anode power supply voltage VDD and cathode power supply voltage VSS based on the displayed grayscale brightness, applying a suitable voltage across the OLED to drive the OLED to emit light. This reduces the lifespan of the OLED. Summary of the Invention

[0003] The purpose of the present application is to provide a pixel circuit and a control method thereof, and a display panel, which extend the service life of a first light-emitting unit and a second light-emitting unit.

[0004] The present application discloses a pixel circuit, which includes a data line, a scan line, a first light-emitting unit, a second light-emitting unit, and a control unit. The data line is connected to the first light-emitting unit, the second light-emitting unit, and the control unit at the same time. The scan line is connected through the control unit, and the control unit is connected to the first light-emitting unit and the second light-emitting unit respectively.

[0005] The control unit is used to compare the data voltage with a preset standard voltage, and when the data voltage is greater than the preset standard voltage, control the first light-emitting unit to work; when the data voltage is less than the preset standard voltage, control the second light-emitting unit to work.

[0006] Optionally, the first light-emitting unit includes a first control switch, the second light-emitting unit includes a second control switch, the control unit includes a peak voltage detection module, a voltage comparison module, and a selection module, the data line, the peak voltage detection module, the voltage comparison module, and the selection module are connected in sequence, and the scan line is connected to the selection module;

[0007] The peak voltage detection module is used to convert the data signal into a data voltage;

[0008] The voltage comparison module is used to compare the data voltage with a preset standard voltage to control the output of the first gate voltage or the second gate voltage;

[0009] The selection module is configured to control the first control switch to be turned on or the second control switch to be turned on according to the received first gate voltage or the received second gate voltage.

[0010] Optionally, the selection module includes a first selection active switch and a second selection active switch, the first selection active switch is an N-type active switch, the second selection active switch is a P-type active switch, the first gate voltage is only used to turn on the first selection active switch, and the second gate voltage is only used to turn on the second selection active switch;

[0011] The output of the voltage comparison module is simultaneously connected to the gate of the first selection active switch and the gate of the second selection active switch, the scan line is simultaneously connected to the source of the first selection active switch and the source of the second selection active switch, the drain of the first selection active switch is connected to the gate of the first control switch, and the drain of the second selection active switch is connected to the gate of the second control switch. Optionally, the first control switch is an N-type active switch, and the second control switch is a P-type active switch. The first gate voltage is only used to turn on the first control switch, and the second gate voltage is only used to turn on the second control switch.

[0012] The selection module includes a third selection active switch, the output end of the voltage comparison module is connected to the source of the third selection active switch, the scan line is connected to the gate of the third selection active switch, and the drain of the third selection active switch is connected to the gate of the first control switch and the gate of the second control switch.

[0013] Optionally, it is characterized in that the peak voltage detection module includes a detection module operational amplifier, a detection module diode and a detection module storage capacitor, the positive input terminal of the detection module operational amplifier is connected to the data line, the output terminal of the detection module operational amplifier is connected to the positive electrode of the detection module diode, one end of the detection module storage capacitor is simultaneously connected to the negative electrode of the negative input terminal of the detection module operational amplifier and the positive electrode of the detection module diode, and the other end is grounded;

[0014] The voltage comparison module includes a voltage comparator, the positive input terminal of the voltage comparator is connected to the cathode of the detection module diode, the reverse input terminal of the voltage comparator is used to receive a preset standard voltage, the first gate voltage input terminal of the voltage comparator is used to receive a first gate voltage, the second gate voltage input terminal of the voltage comparator is used to receive a second gate voltage, and the output terminal of the voltage comparator is connected to the selection module.

[0015] The present application also discloses a method for controlling a pixel circuit, which comprises the following steps:

[0016] Get data voltage;

[0017] Comparing the data voltage with a preset standard voltage;

[0018] When the data voltage is greater than a preset standard voltage, the first light emitting unit is controlled to operate; when the data voltage is less than the preset standard voltage, the second light emitting unit is controlled to operate.

[0019] Optionally, the step of controlling the first light-emitting unit to operate when the data voltage is greater than a preset standard voltage; and controlling the second light-emitting unit to operate when the data voltage is less than the preset standard voltage includes: controlling the scan line to be connected to the gate of a first control switch in the first light-emitting unit when the data voltage is greater than the preset standard voltage;

[0020] When the data voltage is lower than a preset standard voltage, the control scan line is connected to the gate of the second control switch in the second light emitting unit.

[0021] Optionally, the step of controlling the first light-emitting unit to operate when the data voltage is greater than a preset standard voltage; and controlling the second light-emitting unit to operate when the data voltage is less than the preset standard voltage includes: when the data voltage is greater than the preset standard voltage, outputting a first gate voltage to the first light-emitting unit and the second light-emitting unit, wherein the first gate voltage only controls the first light-emitting unit to operate;

[0022] When the data voltage is lower than a preset standard voltage, a second gate voltage is output to the first light emitting unit and the second light emitting unit, and the second gate voltage only controls the second light emitting unit to operate.

[0023] Optionally, the preset standard voltage is greater than a median of the range of the data voltage.

[0024] The present application also discloses a display panel, which includes a pixel circuit.

[0025] Compared with the existing pixel circuit, the present application provides a control unit, a first light-emitting unit, and a second light-emitting unit. The control unit can be used to compare the data voltage with a preset standard voltage. When the data voltage is greater than the preset standard voltage, the first light-emitting unit is controlled to operate; when the data voltage is less than the preset standard voltage, the second light-emitting unit is controlled to operate. In this way, both the first organic light-emitting diode in the first light-emitting unit and the second organic light-emitting diode in the second light-emitting unit can avoid the situation where the anode power supply voltage varies greatly, thereby extending the service life of the first light-emitting unit and the second light-emitting unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0027] Figure 1 This is a schematic diagram of a 2T1C circuit;

[0028] Figure 2 is a schematic diagram of a pixel circuit according to the first embodiment of the present application;

[0029] Figure 3 is a schematic diagram of a control unit of the first embodiment of the present application;

[0030] Figure 4 is a schematic diagram of a repair line of a pixel circuit according to the first embodiment of the present application;

[0031] Figure 5 is a schematic diagram of a pixel circuit according to a second embodiment of the present application;

[0032] Figure 6 is a schematic diagram of a repair line of a pixel circuit according to the second embodiment of the present application;

[0033] Figure 7 is a schematic diagram of a pixel circuit according to the third embodiment of the present application;

[0034] Figure 8 is a schematic diagram of a selection module according to the third embodiment of the present application;

[0035] Figure 9 is a schematic diagram of a method for controlling a pixel circuit according to an embodiment of the present application;

[0036] Figure 10is a schematic diagram of another pixel circuit control method according to an embodiment of the present application;

[0037] Figure 11 is a schematic diagram of a display panel according to an embodiment of the present application.

[0038] Among them, 10, switch tube; 20, drive tube; 30, storage capacitor; 40, organic light emitting diode; 50, anode voltage input terminal; 60, cathode voltage input terminal; 100, display panel; 200, pixel circuit; 210, data line; 220, scan line; 310, first light emitting unit; 311, first control switch; 312, first storage capacitor; 313, first drive switch; 314, first organic light emitting diode; 315, first anode voltage input terminal; 316, first cathode voltage input terminal Terminal; 320, second light-emitting unit; 321, second control switch; 322, second storage capacitor; 323, second drive switch; 324, second organic light-emitting diode; 325, second anode voltage input terminal; 326, second cathode voltage input terminal; 400, control unit; 410, peak voltage detection module; 411, detection module operational amplifier; 412, detection module diode; 413, detection module storage capacitor; 420, voltage comparison module; 421, voltage comparator; 422, first gate 423, first gate voltage input terminal; 424, positive input terminal of voltage comparator; 425, negative input terminal of voltage comparator; 430, selection module; 431, first selection active switch; 432, second selection active switch; 433, third selection active switch; 510, preset standard voltage output module; 520, first gate voltage output module; 530, second gate voltage output module; 610, first repair line; 620, second repair line; 711, first power supply voltage input terminal; 712, second power supply voltage input terminal; 720, first gate voltage input terminal; 730, second gate voltage input terminal; 740, level conversion output terminal; 750, scan line signal input terminal; 760, inverter; 771, first active switch; 772, second active switch; 773, third active switch; 774, fourth active switch; 775, fifth active switch; 776, sixth active switch; 777, seventh active switch; 778, eighth active switch; 779, ninth active switch. DETAILED DESCRIPTION

[0039] It should be understood that the terms used herein, the specific structures and functional details disclosed are only for describing specific embodiments and are representative. However, the present application can be implemented in many alternative forms and should not be construed as being limited to the embodiments described herein.

[0040] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate relative importance or implicitly specify the quantity of the technical features indicated. Therefore, unless otherwise specified, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features; "plurality" means two or more. The term "comprising" and any variations thereof are intended to be non-exclusive inclusion, and one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0041] In addition, terms indicating orientation or positional relationships such as “center,” “lateral,” “up,” “down,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inside,” and “outside” are described based on the orientation or relative positional relationships shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present application.

[0042] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0043] The present application is described in detail below with reference to the accompanying drawings and optional embodiments.

[0044] This application discloses a pixel circuit 200, which can be used in the display panel 100 described above. For the pixel circuit 200, this application provides the following design, which is specifically introduced through several embodiments:

[0045] Example 1:

[0046] Figure 1 This is a schematic diagram of a 2T1C circuit. Figure 2 This is a schematic diagram of a pixel circuit according to the first embodiment of the present application, Figure 1 and Figure 2As shown, the present application discloses a pixel circuit 200, which includes a data line 210, a scan line 220, a first light-emitting unit 310, a second light-emitting unit 320 and a control unit 400. The data line 210 is connected to the first light-emitting unit 310, the second light-emitting unit 320 and the control unit 400 at the same time, the scan line 220 is connected through the control unit 400, and the control unit 400 is connected to the first light-emitting unit 310 and the second light-emitting unit 320 respectively.

[0047] The control unit 400 is used to compare the data voltage with a preset standard voltage, and when the data voltage is greater than the preset standard voltage, control the first light-emitting unit 310 to work; when the data voltage is less than the preset standard voltage, control the second light-emitting unit 320 to work.

[0048] The pixel circuit 200 is used in the OLED display panel 100, and mainly displays by connecting an anode power supply voltage and a cathode power supply voltage to the anode and cathode of the organic light-emitting diode 40, respectively. However, in the current OLED display panel 100, the control of the display grayscale is achieved by precisely controlling the anode power supply voltage and the cathode power supply voltage to provide a suitable voltage to the anode and cathode of the organic light-emitting diode 40. As a result, when the organic light-emitting diode 40 displays different grayscales, the anode power supply voltage varies greatly, resulting in a shortened lifespan of the organic light-emitting diode 40. Figure 3 This is a schematic diagram of a control unit according to the first embodiment of the present application, Figure 3 As shown, exemplarily, the first light-emitting unit 310 includes a first control switch 311, a first storage capacitor 312, a first drive switch 313, a first organic light-emitting diode 314, a first anode voltage input terminal 315 and a first cathode voltage input terminal 316; the source of the first control switch 311 is connected to the scan line 220, the drain of the first control switch 311 is connected to the gate of the first drive switch 313, the source of the first drive switch 313 is connected to the first anode voltage input terminal 315, the drain of the first drive switch 313 is connected to the anode of the first organic light-emitting diode 314, the cathode of the first organic light-emitting diode 314 is connected to the first cathode voltage input terminal 316, and the first storage capacitor 312 is respectively connected to the gate of the first drive switch 313 and the source of the first drive switch 313; the first anode voltage input terminal 315 is used to receive an anode power supply voltage, and the first cathode voltage input terminal 316 is used to receive a cathode power supply voltage.

[0049] It should be understood that the first anode voltage input terminal 315 of the first light emitting unit 310 is in operation and is conductive to the anode of the first organic light emitting diode 314 , so that the anode power supply voltage can be input to the anode of the first organic light emitting diode 314 .

[0050] Exemplarily, the second light-emitting unit 320 includes a second control switch 321, a second storage capacitor 322, a second drive switch 323, a second organic light-emitting diode 324, a second anode voltage input terminal 325, and a second cathode voltage input terminal 326; the source of the second control switch 321 is connected to the scan line 220, the drain of the second control switch 321 is connected to the gate of the second drive switch 323, the source of the second drive switch 323 is connected to the second anode voltage input terminal 325, the drain of the second drive switch 323 is connected to the anode of the second organic light-emitting diode 324, the cathode of the second organic light-emitting diode 324 is connected to the second cathode voltage input terminal 326, and the second storage capacitor 322 is respectively connected to the gate of the second drive switch 323 and the source of the second drive switch 323; the second anode voltage input terminal 325 is used to receive an anode power supply voltage, and the second cathode voltage input terminal 326 is used to receive a cathode power supply voltage.

[0051] It should be understood that when the second light emitting unit 320 is working, the second anode voltage input terminal 325 and the anode of the second organic light emitting diode 324 are conductive, so that the anode power supply voltage can be input to the anode of the second organic light emitting diode 324 .

[0052] Compared with the existing pixel circuit 200, the present application provides a control unit 400, a first light-emitting unit 310, and a second light-emitting unit 320. The control unit 400 can be used to compare the data voltage with a preset standard voltage. When the data voltage is greater than the preset standard voltage, the first light-emitting unit 310 is controlled to operate; when the data voltage is less than the preset standard voltage, the second light-emitting unit 320 is controlled to operate. In this way, both the first organic light-emitting diode 314 in the first light-emitting unit 310 and the second organic light-emitting diode 324 in the second light-emitting unit 320 can avoid the situation where the anode power supply voltage changes greatly, thereby extending the service life of the first light-emitting unit 310 and the second light-emitting unit 320.

[0053] Moreover, compared with the method of setting two organic light-emitting diodes 40 to work in turn, since the higher the grayscale, the corresponding anode power supply voltage is larger, and the voltage value of the data voltage is also larger, the present application judges the data voltage of the current pixel. When the data voltage is greater than the preset standard voltage, the first light-emitting unit 310 is controlled to work; when the data voltage is less than the preset standard voltage, the second light-emitting unit 320 is controlled to work.

[0054] It can be understood that the first organic light-emitting diode 314 works in the high grayscale range, and the second organic light-emitting diode 324 works in the low grayscale range. In this way, the variation of the anode power supply voltage of the first organic light-emitting diode 314 is small, and the variation of the anode power supply voltage of the second organic light-emitting diode 324 is also relatively small, thereby improving the service life of each organic light-emitting diode 40, which is longer than the service life of the two organic light-emitting diodes 40 working in turn.

[0055] The first light emitting unit 310 or the second light emitting unit 320 may be controlled to operate by turning on the first control switch 311 or the second control switch 321, as follows:

[0056] The first light-emitting unit 310 includes a first control switch 311, the second light-emitting unit 320 includes a second control switch 321, the control unit 400 includes a peak voltage detection module 410, a voltage comparison module 420 and a selection module 430, the data line 210, the peak voltage detection module 410, the voltage comparison module 420 and the selection module 430 are connected in sequence, and the scan line 220 is connected to the selection module 430.

[0057] The peak voltage detection module 410 is used to convert the data signal into a data voltage; the voltage comparison module 420 is used to compare the data voltage with the preset standard voltage to control the output of the first gate voltage or the second gate voltage; the selection module 430 is used to control the first control switch 311 to open or the second control switch 321 to open according to the received first gate voltage or the second gate voltage.

[0058] Exemplarily, the first gate voltage is VGH, and the second gate voltage is VGL.

[0059] Simply put, the voltage comparison module 420 can output a first gate voltage or a second gate voltage. When the voltage comparison module 420 outputs the first gate voltage, the first control switch 311 will be turned on and the second control switch 321 will not be turned on. At this time, the first light-emitting unit 310 works and the second light-emitting unit 320 does not work; when the voltage comparison module 420 outputs the second gate voltage, the second control switch 321 will be turned on and the first control switch 311 will not be turned on. At this time, the second light-emitting unit 320 works and the first light-emitting unit 310 does not work.

[0060] In this embodiment, the connection between the scan line 220 and the gate of the first control switch 311 or the scan line 220 and the gate of the second control switch 321 is controlled by the selection module 430, specifically as follows; the selection module 430 includes a first selection active switch 431 and a second selection active switch 432, the first selection active switch 431 is an N-type active switch, and the second selection active switch 432 is a P-type active switch, the first gate voltage is only used to turn on the first selection active switch 431, and the second gate voltage is only used to turn on the second selection active switch 432.

[0061] The output end of the voltage comparison module 420 is connected to the gate of the first selection active switch 431 and the gate of the second selection active switch 432 at the same time. The scan line 220 is connected to the source of the first selection active switch 431 and the source of the second selection active switch 432 at the same time. The drain of the first selection active switch 431 is connected to the gate of the first control switch 311, and the drain of the second selection active switch 432 is connected to the gate of the second control switch 321.

[0062] The first control switch 311 and the second control switch 321 are control switches of the same type. Exemplarily, the first control switch 311 and the second control switch 321 are both N-type active switches. When the first control switch 311 and the second control switch 321 are both N-type active switches, the scan signal of the scan line 220 is VGH. Exemplarily, the first control switch 311 and the second control switch 321 are both P-type active switches. When the first control switch 311 and the second control switch 321 are both P-type active switches, the scan signal of the scan line 220 is VGL.

[0063] The peak voltage detection module 410 includes a detection module operational amplifier 411, a detection module diode 412 and a detection module storage capacitor 413. The positive input end of the detection module operational amplifier 411 is connected to the data line 210, the output end of the detection module operational amplifier 411 is connected to the positive electrode of the detection module diode 412, one end of the detection module storage capacitor 413 is simultaneously connected to the reverse input end of the detection module operational amplifier 411 and the negative electrode of the detection module diode 412, and the other end is grounded.

[0064] The voltage comparison module 420 includes a voltage comparator 421, the positive input terminal 424 of the voltage comparator is connected to the cathode of the detection module diode 412, the reverse input terminal 425 of the voltage comparator is used to receive a preset standard voltage, the first gate voltage input terminal 720 of the voltage comparator 421 is used to receive a first gate voltage, the second gate voltage input terminal 730 of the voltage comparator 421 is used to receive a second gate voltage, and the output terminal of the voltage comparator 421 is connected to the selection module 430.

[0065] In this embodiment, the output terminal of the voltage comparator 421 is connected to the gate of the first selection active switch 431 and the gate of the second selection active switch 432 at the same time.

[0066] The data signal of the data line 210 is received through the positive input terminal of the detection module operational amplifier 411. When the data signal voltage rises, due to the "virtual short" characteristic of the detection module operational amplifier 411, the voltage of the reverse input terminal of the detection module operational amplifier 411 will be infinitely close to the voltage of the data signal. At this time, the output terminal voltage of the detection module operational amplifier 411 rises synchronously. When the output terminal voltage of the detection module operational amplifier 411 rises to the conduction threshold voltage of the detection module diode 412, the detection module diode 412 is turned on and the detection module storage capacitor 413 is charged at the same time.

[0067] When the voltage of the data signal continues to be at a high level for a period of time and begins to decrease, the output voltage of the detection module operational amplifier 411 decreases synchronously. Since the detection module storage capacitor 413 stores charge, the cathode potential of the detection module diode 412 can be maintained unchanged, that is, the anode voltage of the detection module diode 412 decreases, and the cathode voltage of the detection module diode 412 remains unchanged. Due to the unidirectional conduction characteristic of the detection module diode 412, that is, the anode and cathode voltages of the detection module diode 412 must be greater than its conduction threshold voltage to be normally conductive. When the voltages across the anode and cathode of the detection module diode 412 are less than its threshold voltage, it is reversely cut off; due to the action of the detection module storage capacitor 413, the output end of the detection module can be maintained at the peak voltage state maintained before, thereby converting the data signal voltage into a DC data voltage and outputting the data voltage.

[0068] The positive input terminal 424 of the voltage comparator in the voltage comparison module 420 receives the data voltage, the reverse input terminal 425 of the voltage comparator receives the preset standard voltage, the first gate voltage input terminal 720 of the voltage comparator 421 receives the first gate voltage, and the second gate voltage input terminal 730 of the voltage comparator 421 receives the second gate voltage. When the data voltage is greater than the preset standard voltage, the output terminal of the voltage comparator 421 outputs the first gate voltage, namely VGH; when the data voltage is less than the preset standard voltage, the output terminal of the voltage comparator 421 outputs the second gate voltage, namely VGL.

[0069] Since the first selection active switch 431 of the selection module 430 is an N-type active switch and the second selection active switch 432 is a P-type active switch, when the gates of the first selection active switch 431 and the second selection active switch 432 both receive the first gate voltage, the first selection active switch 431 will be turned on, while the second selection active switch 432 will not be turned on. At this time, the scan line 220 is connected to the gate of the first control switch 311 in the first light-emitting unit 310, and the scan signal on the corresponding scan line 220 will turn on the first control switch 311, while the second control switch 321 will not be turned on. is turned on; then when the gates of the first selection active switch 431 and the second selection active switch 432 both receive the second gate voltage, the second selection active switch 432 will be turned on, and the first selection active switch 431 will not be turned on. At this time, the scan line 220 is connected to the gate of the second control switch 321 in the second light-emitting unit 320, and the scan signal on the corresponding scan line 220 will turn on the second control switch 321, while the first control switch 311 will not be turned on, thereby realizing the selection of the first light-emitting unit 310 or the second light-emitting unit 320 to work according to the size of the data voltage.

[0070] Figure 4 Schematic diagram of a repair line of a pixel circuit according to the first embodiment of the present application. Figure 4 As shown, because the first organic light-emitting diode 314 in the first light-emitting unit 310 is used to display a relatively high grayscale, and the second organic light-emitting diode 324 in the second light-emitting unit 320 is used to display a relatively low grayscale, the service life of the first organic light-emitting diode 314 and the second organic light-emitting diode 324 is uneven. The pixel circuit 200 includes a first repair line 610 and a second repair line 620. One end of the first repair line 610 is connected to the drain of the first selection active switch 431, and one end of the second repair line 620 is connected to the drain of the second selection active switch 432. The other end of the first repair line 610 overlaps with the other end of the second repair line 620, and the other end of the first repair line 610 is used to weld the other end of the second repair line 620.

[0071] Thus, when the first organic light-emitting diode 314 in the first light-emitting unit 310 is unusable, the voltage comparison module 420 outputs the first gate voltage, and the scan line 220 can still be connected to the second control switch 321 to turn on the second control switch 321, allowing the second light-emitting unit 320 to operate, thereby avoiding the problem of black spots appearing at the location corresponding to the unusable first organic light-emitting diode 314 in the first light-emitting unit 310. Furthermore, if one of the first organic light-emitting diode 314 or the second organic light-emitting diode 324 becomes unusable during production, the first repair line 610 and the second repair line 620 can be used to simultaneously connect the scan line 220 to the first control switch 311 and the second control switch 321, regardless of whether the voltage comparison module 420 outputs the first gate voltage or the second gate voltage.

[0072] Example 2:

[0073] Figure 5 is a schematic diagram of a pixel circuit according to the second embodiment of the present application. Figure 5 As shown, the present application also discloses another pixel circuit 200, which is different from the first embodiment in that only one third selection active switch 433 is provided in the selection module 430, specifically as follows: the first control switch 311 is an N-type active switch, the second control switch 321 is a P-type active switch, the first gate voltage is only used to open the first control switch 311, and the second gate voltage is only used to open the second control switch 321.

[0074] The selection module 430 includes a third selection active switch 433. The output end of the voltage comparison module 420 is connected to the source of the third selection active switch 433. The scan line 220 is connected to the gate of the third selection active switch 433. The drain of the third selection active switch 433 is simultaneously connected to the gate of the first control switch 311 and the gate of the second control switch 321.

[0075] Compared to the first embodiment, this embodiment configures the first control switch 311 as an N-type active switch and the second control switch 321 as a P-type active switch, thereby reducing the number of active selection switches within the selection module 430, simplifying the structure of the selection module 430, and improving product yield. Furthermore, in this embodiment, the peak voltage detection module 410 includes a detection module operational amplifier 411, a detection module diode 412, and a detection module storage capacitor 413. The positive input of the detection module operational amplifier 411 is connected to the data line 210, the output of the detection module operational amplifier 411 is connected to the anode of the detection module diode 412, and one end of the detection module storage capacitor 413 is connected to the negative input of the detection module operational amplifier 411, and the other end is grounded.

[0076] The voltage comparison module 420 includes a voltage comparator 421. The positive input terminal 424 of the voltage comparator is connected to the cathode of the detection module diode 412. The negative input terminal 425 of the voltage comparator is used to receive a preset standard voltage. The first gate voltage input terminal 720 of the voltage comparator 421 is used to receive a first gate voltage. The second gate voltage input terminal 730 of the voltage comparator 421 is used to receive a second gate voltage. The output terminal of the voltage comparator 421 is connected to the selection module 430. The output terminal of the voltage comparator 421 is connected to the source of the third selection active switch 433.

[0077] Since the peak voltage detection module 410 and the voltage comparison module 420 are the same as those in the first embodiment, they are not described in detail.

[0078] Since the first control switch 311 is an N-type active switch and the second control switch 321 is a P-type active switch, when the voltage comparison module 420 outputs the first gate voltage, the gates of the first control switch 311 and the second control switch 321 both receive the first gate voltage, the first control switch 311 will be turned on, and the second control switch 321 will not be turned on; then, when the voltage comparison module 420 outputs the second gate voltage, the gates of the first control switch 311 and the second control switch 321 both receive the second gate voltage, the second control switch 321 will be turned on, and the first control switch 311 will not be turned on, thereby realizing the selection of the first light-emitting unit 310 or the second light-emitting unit 320 to work according to the size of the data voltage.

[0079] Moreover, since the on-resistance of the N-type active switch is lower than that of the P-type active switch, setting the first control switch 311 as an N-type active switch and the second control switch 321 as a P-type active switch can avoid display abnormalities in high-grayscale images, while low-grayscale images are not affected because the grayscale is originally relatively low.

[0080] Figure 6 This is a schematic diagram of a repair line of a pixel circuit according to the second embodiment of the present application. Figure 6 As shown, the pixel circuit 200 also includes a first repair line 610 and a second repair line 620. Different from the first embodiment, one end of the first repair line 610 is connected to the drain of the first control switch 311, and one end of the second repair line 620 is connected to the drain of the second control switch 321. The other end of the first repair line 610 is overlapped with the other end of the second repair line 620, and the other end of the first repair line 610 is used to weld the other end of the second repair line 620.

[0081] In this way, when the first organic light emitting diode 314 in the first light emitting unit 310 cannot be used, the voltage comparison module 420 outputs the first gate voltage, the third control switch of the scan line 220 is turned on to open the first control switch 311, and the data signal is input to the second light emitting unit 320 through the repair line, thereby avoiding the problem of black spots and dark spots appearing at the position corresponding to the unusable first organic light emitting diode 314 in the first light emitting unit 310.

[0082] Figure 7 is a schematic diagram of a pixel circuit according to the third embodiment of the present application. Figure 8 This is a schematic diagram of a selection module of the third embodiment of the present application, combined with Figure 7 and Figure 8As shown, different from the first embodiment, the first control switch 311 is an N-type active switch, the second control switch 321 is a P-type active switch, the voltage comparison module 420 includes a voltage comparator 421, the positive input terminal 424 of the voltage comparator is connected to the cathode of the detection module diode 412, the reverse input terminal 425 of the voltage comparator is used to receive a preset standard voltage, the first power supply voltage input terminal 711 of the voltage comparator 421 is used to receive a first power supply voltage, the second power supply voltage input terminal 712 of the voltage comparator 421 is used to receive a second power supply voltage, and the output terminal of the voltage comparator 421 is connected to the selection module 430.

[0083] The selection module 430 includes a first power supply voltage input terminal 711, a first gate voltage input terminal 720, a second gate voltage input terminal 730, a level conversion output terminal 740, a scan line signal input terminal 750, an inverter 760, a first active switch 771, a second active switch 772, a third active switch 773, a fourth active switch 774, a fifth active switch 775, a sixth active switch 776, a seventh active switch 777, an eighth active switch 778 and a ninth active switch 779.

[0084] The first active switch 771 , the second active switch 772 , the fifth active switch 775 and the sixth active switch 776 are all P-type active switches, and the third active switch 773 , the fourth active switch 774 , the seventh active switch 777 and the eighth active switch 778 are all N-type active switches.

[0085] The first power supply voltage input terminal 711 is used to receive a first power supply voltage. The gate of the first active switch 771 is connected to the output of the voltage comparator 421. The input and output of the inverter 760 are respectively connected to the gate of the first active switch 771 and the gate of the second active switch 772. The first power supply voltage input terminal 711 is simultaneously connected to the source of the first active switch 771 and the source of the second active switch 772. The drain of the first active switch 771 is simultaneously connected to the source of the third active switch 773, the gate of the fourth active switch 774, and the gate of the eighth active switch 778. The drain of the second active switch 772 is simultaneously connected to the gate of the third active switch 773, the source of the fourth active switch 774, and the gate of the seventh active switch 777.

[0086] The second gate voltage input terminal 730 is simultaneously connected to the drain of the third active switch 773, the drain of the fourth active switch 774, the source of the seventh active switch 777, and the source of the eighth active switch 778. The first gate voltage input terminal 720 is simultaneously connected to the source of the fifth active switch 775 and the source of the sixth active switch 776. The drain of the fifth active switch 775 is connected to the drain of the seventh active switch 777 and the gate of the sixth active switch 776. The drain of the sixth active switch 776 is simultaneously connected to the drain of the eighth active switch 778 and the gate of the fifth active switch 775, and the level shifter output terminal 740. The first power supply voltage is VDD, the second power supply voltage is VSS, the first gate voltage is VGH, and the second gate voltage is VGL.

[0087] The source of the ninth active switch 779 is connected to the level conversion output terminal 740, the gate of the ninth active switch 779 is connected to the scan line 220, and the drain of the ninth active switch 779 is connected to the first control switch 311 and the second control switch 321. The ninth active switch 779 is used to determine whether the selection module 430 outputs a signal based on the scan signal.

[0088] When the ninth active switch 779 is turned on and the voltage comparison module 420 outputs the first power supply voltage, the first active switch 771 is turned off, the second active switch 772 is turned on, the third active switch 773 is turned on, the fourth active switch 774 is turned off, the fifth active switch 775 is turned off, the sixth active switch 776 is turned on, the seventh active switch 777 is turned on, and the eighth active switch 778 is turned off. The first gate voltage is output from the level conversion output terminal 740 to the gates of the first control switch 311 and the second control switch 321 via the first gate voltage input terminal 720 and the sixth active switch 776. The first control switch 311 is turned on and the second control switch 321 is turned off. At this time, the first organic light emitting diode 314 in the first light emitting unit 310 emits light.

[0089] When the voltage comparison module 420 outputs the second power supply voltage, the first active switch 771 is turned on, the second active switch 772 is turned off, the third active switch 773 is turned off, the fourth active switch 774 is turned on, the fifth active switch 775 is turned on, the sixth active switch 776 is turned off, the seventh active switch 777 is turned off, and the eighth active switch 778 is turned on. The second gate voltage is output from the level conversion output terminal 740 to the gates of the first control switch 311 and the second control switch 321 via the second gate voltage input terminal 730 and the eighth active switch 778. The second control switch 321 is turned on and the first control switch 311 is turned off. At this time, the second organic light emitting diode 324 in the second light emitting unit 320 emits light.

[0090] Figure 9 is a schematic diagram of a method for controlling a pixel circuit according to an embodiment of the present application. Figure 9 As shown, the present application also discloses a method for controlling a pixel circuit. The method for controlling the pixel circuit 200 includes the following steps:

[0091] S1: Get data voltage;

[0092] S2: Compare the data voltage with the preset standard voltage;

[0093] S3: When the data voltage is greater than the preset standard voltage, the first light emitting unit is controlled to operate; when the data voltage is less than the preset standard voltage, the second light emitting unit is controlled to operate.

[0094] In the present application, when the data voltage is greater than a preset standard voltage, the first light-emitting unit 310 is controlled to operate; when the data voltage is less than the preset standard voltage, the second light-emitting unit 320 is controlled to operate. In this way, both the first organic light-emitting diode 314 in the first light-emitting unit 310 and the second organic light-emitting diode 324 in the second light-emitting unit 320 can avoid a large change in the anode power supply voltage, thereby extending the service life of the first light-emitting unit 310 and the second light-emitting unit 320.

[0095] The step S3: when the data voltage is greater than the preset standard voltage, controlling the first light emitting unit to operate; when the data voltage is less than the preset standard voltage, controlling the second light emitting unit to operate includes:

[0096] S311: When the data voltage is greater than a preset standard voltage, controlling the scan line to be connected to the gate of the first control switch in the first light-emitting unit;

[0097] S312: When the data voltage is lower than a preset standard voltage, the scan line is controlled to be connected to the gate of the second control switch in the second light-emitting unit.

[0098] The operation of the first light-emitting unit 310 or the second light-emitting unit 320 is controlled by controlling the on / off connection of the scanning line 220 with the gate of the first control switch 311 or the gate of the second control switch 321. In this way, there is no need to change the first control switch 311 in the first light-emitting unit 310 and the second control switch 321 in the second light-emitting unit 320, thereby ensuring the normal display of the display data of the screen.

[0099] Figure 10 FIG. 1 is a schematic diagram of another method for controlling a pixel circuit according to an embodiment of the present application. Figure 10As shown, the step of S3: when the data voltage is greater than the preset standard voltage, controlling the first light emitting unit to work; when the data voltage is less than the preset standard voltage, controlling the second light emitting unit to work may also include:

[0100] S321: When the data voltage is greater than a preset standard voltage, outputting a first gate voltage to the first light emitting unit and the second light emitting unit, wherein the first gate voltage only controls the first light emitting unit to operate;

[0101] S322: When the data voltage is lower than a preset standard voltage, outputting a second gate voltage to the first light emitting unit and the second light emitting unit, wherein the second gate voltage only controls the second light emitting unit to operate.

[0102] By controlling the scanning line 220 to control the on / off connection between the selection module 430 and the gate of the first control switch 311 and the gate of the second control switch 321, and at the same time, the gate of the first control switch 311 and the gate of the second control switch 321 output the first gate voltage or the second gate voltage, the number of active switches selected in the selection module 430 can be reduced, thereby simplifying the structure of the pixel circuit 200 and improving the production yield.

[0103] Since the first organic light-emitting diode 314 in the first light-emitting unit 310 is used to display a relatively high grayscale, and the second organic light-emitting diode 324 in the second light-emitting unit 320 is used to display a relatively low grayscale, the service life of the first organic light-emitting diode 314 and the second organic light-emitting diode 324 is uneven. Therefore, the present application also adjusts the preset standard voltage.

[0104] Different grayscales correspond to different data voltages, and the preset standard voltage is greater than the median of the data voltage range. The data voltage range represents a set of different data voltages corresponding to the minimum and maximum displayable grayscales. Compared to using the preset standard voltage equal to the median of the data voltage range, the preset standard voltage being greater than the median of the data voltage range can significantly reduce the operating frequency of the first organic light-emitting diode 314, thereby balancing the service life of the first organic light-emitting diode 314 and the second organic light-emitting diode 324.

[0105] For example, the OLED display panel 100 has an 8-bit display, which can display grayscales from 0 to 255. The preset standard voltage corresponds to grayscale 192. This increases the light-emission duration of the second organic light-emitting diode 324 and reduces the light-emission duration of the first organic light-emitting diode 314, thereby balancing the service life of the first organic light-emitting diode 314 and the second organic light-emitting diode 324.

[0106] Figure 11 is a schematic diagram of a display panel according to an embodiment of the present application. Figure 11 As shown, the present application further discloses a display panel 100 , which includes a pixel circuit 200 .

[0107] The display panel 100 further includes a preset standard voltage output module 510, a first gate voltage output module 520, and a second gate voltage output module 530. The preset standard voltage output module 510, the first gate voltage output module 520, and the second gate voltage output module 530 are all connected to the pixel circuit 200. Specifically, the output terminal of the preset standard voltage output module 510 is connected to the inverting input terminal 425 of the voltage comparator, and the preset standard voltage output module 510 is configured to output a preset standard voltage; the first gate voltage output module 520 is connected to the first gate voltage input terminal 720 of the voltage comparator 421, and the first gate voltage output module 520 is configured to output a first gate voltage; and the second gate voltage output module 530 is connected to the second gate voltage input terminal 730 of the voltage comparator 421, and the second gate voltage output module 530 is configured to output a second gate voltage.

[0108] It should be noted that the limitations on the steps involved in this solution do not limit the order of the steps without affecting the implementation of the specific solution. The steps written in front can be executed first, later, or even simultaneously. As long as this solution can be implemented, it should be deemed to fall within the scope of protection of this application.

[0109] It should be noted that the inventive concept of this application can form a large number of embodiments, but the length of the application document is limited and it is impossible to list them one by one. Therefore, under the premise of no conflict, the various embodiments or technical features described above can be arbitrarily combined to form new embodiments. After the various embodiments or technical features are combined, the original technical effects will be enhanced.

[0110] The above content is a further detailed description of the present application in conjunction with specific optional implementation methods, and the specific implementation of the present application cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, they can make several simple deductions or substitutions without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A pixel circuit, characterized in that: The pixel circuit includes a data line, a scan line, a first light-emitting unit, a second light-emitting unit, and a control unit, wherein the data line is connected to the first light-emitting unit, the second light-emitting unit, and the control unit at the same time, the scan line is connected through the control unit, and the control unit is connected to the first light-emitting unit and the second light-emitting unit respectively; The control unit is used to compare the data voltage with a preset standard voltage, and when the data voltage is greater than the preset standard voltage, control the first light-emitting unit to work; when the data voltage is less than the preset standard voltage, control the second light-emitting unit to work.

2. The pixel circuit according to claim 1, wherein: The first light-emitting unit includes a first control switch, the second light-emitting unit includes a second control switch, the control unit includes a peak voltage detection module, a voltage comparison module and a selection module, the data line, the peak voltage detection module, the voltage comparison module and the selection module are connected in sequence, and the scan line is connected to the selection module; The peak voltage detection module is used to convert the data signal into a data voltage; The voltage comparison module is used to compare the data voltage with a preset standard voltage to control the output of the first gate voltage or the second gate voltage; The selection module is configured to control the first control switch to be turned on or the second control switch to be turned on according to the received first gate voltage or the received second gate voltage.

3. The pixel circuit according to claim 2, wherein: The selection module includes a first selection active switch and a second selection active switch, the first selection active switch is an N-type active switch, the second selection active switch is a P-type active switch, the first gate voltage is only used to turn on the first selection active switch, and the second gate voltage is only used to turn on the second selection active switch; The output end of the voltage comparison module is connected to the gate of the first selection active switch and the gate of the second selection active switch at the same time, the scan line is connected to the source of the first selection active switch and the source of the second selection active switch at the same time, the drain of the first selection active switch is connected to the gate of the first control switch, and the drain of the second selection active switch is connected to the gate of the second control switch.

4. The pixel circuit according to claim 2, wherein: The first control switch is an N-type active switch, the second control switch is a P-type active switch, the first gate voltage is only used to turn on the first control switch, and the second gate voltage is only used to turn on the second control switch; The selection module includes a third selection active switch, the output end of the voltage comparison module is connected to the source of the third selection active switch, the scan line is connected to the gate of the third selection active switch, and the drain of the third selection active switch is connected to the gate of the first control switch and the gate of the second control switch.

5. The pixel circuit according to any one of claim 2, wherein: The peak voltage detection module includes a detection module operational amplifier, a detection module diode, and a detection module storage capacitor, wherein the positive input terminal of the detection module operational amplifier is connected to the data line, the output terminal of the detection module operational amplifier is connected to the anode of the detection module diode, one end of the detection module storage capacitor is simultaneously connected to the negative electrode of the negative input terminal of the detection module operational amplifier and the anode of the detection module diode, and the other end is grounded; The voltage comparison module includes a voltage comparator, the positive input terminal of the voltage comparator is connected to the cathode of the detection module diode, the reverse input terminal of the voltage comparator is used to receive a preset standard voltage, the first gate voltage input terminal of the voltage comparator is used to receive a first gate voltage, the second gate voltage input terminal of the voltage comparator is used to receive a second gate voltage, and the output terminal of the voltage comparator is connected to the selection module.

6. A method for controlling a pixel circuit, characterized in that: The control method of the pixel circuit comprises the steps of: obtaining a data voltage; Comparing the data voltage with a preset standard voltage; When the data voltage is greater than a preset standard voltage, controlling the first light emitting unit to operate; When the data voltage is lower than the preset standard voltage, the second light emitting unit is controlled to operate.

7. The method for controlling a pixel circuit according to claim 6, wherein: When the data voltage is greater than a preset standard voltage, controlling the first light emitting unit to operate; When the data voltage is less than a preset standard voltage, the step of controlling the second light emitting unit to operate includes: When the data voltage is greater than a preset standard voltage, the scan line is controlled to be connected to the gate of the first control switch in the first light-emitting unit; When the data voltage is lower than a preset standard voltage, the control scan line is connected to the gate of the second control switch in the second light emitting unit.

8. The method for controlling a pixel circuit according to claim 6, wherein: When the data voltage is greater than a preset standard voltage, controlling the first light emitting unit to operate; When the data voltage is less than a preset standard voltage, the step of controlling the second light emitting unit to operate includes: When the data voltage is greater than a preset standard voltage, a first gate voltage is output to the first light emitting unit and the second light emitting unit, wherein the first gate voltage only controls the first light emitting unit to operate; When the data voltage is lower than a preset standard voltage, a second gate voltage is output to the first light emitting unit and the second light emitting unit, and the second gate voltage only controls the second light emitting unit to operate.

9. The method for controlling a pixel circuit according to claim 6, wherein: The preset standard voltage is greater than a median of a range of the data voltage.

10. A display panel, characterized in that: The display panel comprises the pixel circuit according to any one of claims 1 to 5.

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