Display driving circuit, display driving method and display panel

Abstract

The present application belongs to the field of display, and specifically relates to a display driving circuit, a display driving method and a display panel. The display driving circuit includes a data writing unit, a first transistor, a compensation unit, a storage unit and an initialization unit. The data writing unit is connected to a first scan line, a data line and a control end of the first transistor. The compensation unit is connected to a second scan line, a first power supply and a first end of the first transistor. The control end of the first transistor is connected to the data writing unit through a first node. The second end of the first transistor is connected to an anode of a display light-emitting unit through a second node. The storage unit is connected to a first node and a second node. The initialization unit is connected to a third scan line, a second scan line and a second node. The compensation unit controls the threshold voltage of the first transistor to be written into the storage unit, and also serves as a light-emitting control unit to control the light-emitting unit to emit light, thereby eliminating the light-emitting control unit, reducing the space occupied by the display panel, and improving the aperture ratio of the display panel.

Description

Technical Field

[0001] The present application belongs to the field of display, and specifically relates to a display driving circuit, a display driving method and a display panel. Background Art

[0002] OLED (Organic Light-Emitting Diode) display panel has the advantages of self-luminescence, flexibility, thin thickness, high brightness, low power consumption, fast response, and wide color gamut, and has broad development prospects.

[0003] The display driving circuit of the organic light emitting diode includes a driving transistor. When the scanning signal arrives, the data signal is written into the gate of the driving transistor to control the degree of opening of the driving transistor, thereby controlling the driving current through the organic light emitting diode and the brightness of the organic light emitting diode. In the production process of the display panel, it is difficult to achieve absolute uniformity of the film quality at each position, resulting in different threshold voltages (Vth) of different driving transistors.

[0004] In order to compensate for the display unevenness caused by the difference in threshold voltage, the existing display panel is provided with a complex display driving circuit. However, the more complex the display driving circuit is, the more space the signal wiring and transistors occupy in the display panel, which reduces the aperture ratio of the display panel. Summary of the invention

[0005] The purpose of the present application is to provide a display driving circuit, a display driving method and a display panel, so as to simplify the display driving circuit and improve the aperture ratio of the display panel.

[0006] In order to achieve the above object, the present application provides a display panel, including a data writing unit and a first transistor, wherein the data writing unit is connected to a first scan line, a data line and a control end of the first transistor, and is used to write a data voltage of the data line in response to the first scan line signal, and the display driving circuit further includes:

[0007] a compensation unit connected to the second scan line, the first power supply and the first end of the first transistor, and configured to write the first power supply voltage in response to the second scan line signal;

[0008] A storage unit, wherein the control end of the first transistor is connected to the data writing unit through a first node, the second end of the first transistor is connected to the anode of the display light-emitting unit through a second node, the cathode of the display light-emitting unit is connected to a second power supply, the first power supply voltage is greater than the second power supply voltage, and the storage unit is connected to the first node and the second node;

[0009] An initialization unit is connected to the third scan line, the second scan line and the second node, and is used to write the second scan line signal in response to the third scan line signal.

[0010] Optionally, the compensation unit includes a second transistor, a control end of the second transistor is connected to the second scan line, a first end of the second transistor is connected to the first power supply, and a second end of the second transistor is connected to the first transistor.

[0011] Optionally, the data writing unit includes a third transistor, a control end of the third transistor is connected to the first scan line, a first end of the third transistor is connected to the data line, and a second end of the third transistor is connected to the first node;

[0012] The initialization unit includes a fourth transistor, a control terminal of the fourth transistor is connected to the third scan line, a first terminal of the fourth transistor is connected to the second scan line, and a second terminal of the fourth transistor is connected to the second node.

[0013] Optionally, the first transistor, the second transistor, the third transistor and the fourth transistor are all N-type thin film transistors.

[0014] Optionally, the data voltage includes a non-display voltage Vd1 or a display voltage Vd2, the low level voltage of the second scan line signal is Vgl, the threshold voltage of the first transistor is Vth, and Vd1-Vgl>Vth.

[0015] Optionally, a difference between the low level voltage of the second scan line signal and the second power supply voltage is smaller than a turn-on voltage of the display light emitting unit.

[0016] Optionally, the low level voltage of the second scan line signal is less than the second power supply voltage.

[0017] Optionally, the data voltage includes a non-display voltage Vd1 or a display voltage Vd2, a threshold voltage of the first transistor is Vth, a voltage of the second power supply is Vss, and Vd1 - Vth < Vss.

[0018] The present application also provides a display driving method, the display driving method is used to drive the display driving circuit, the display driving method comprises:

[0019] In the initialization stage, the compensation unit is controlled to be turned off and the data writing unit and the initialization unit are controlled to be turned on, the data voltage is maintained as a non-display voltage, so that the low level voltage of the second scan line is written into the second node, and the first transistor is turned on;

[0020] In the compensation stage, the compensation unit and the data writing unit are controlled to be turned on and the initialization unit is controlled to be turned off, the data voltage is maintained as a non-display voltage, so that the threshold voltage of the first transistor is written into the storage unit and the first transistor is turned off;

[0021] In the data writing stage, the compensation unit and the initialization unit are controlled to be turned off and the data writing unit is controlled to be turned on, the data voltage is switched to the display voltage, and the first transistor is turned on again;

[0022] In the light-emitting stage, the compensation unit is controlled to be turned on and the data writing unit and the initialization unit are controlled to be turned off, so that the display light-emitting unit emits light.

[0023] The present application also provides a display panel, comprising:

[0024] The display driving circuit;

[0025] The display light emitting unit is connected to the display driving circuit.

[0026] The display driving circuit, display driving method and display panel disclosed in the present application have the following beneficial effects:

[0027] In the present application, the display driving circuit includes a first transistor, a compensation unit, a data writing unit, an initialization unit and a storage unit. The data writing unit is used to write the data voltage of the data line in response to the first scan line signal, the compensation unit is used to write the first power supply voltage in response to the second scan line signal, the control end of the first transistor is connected to the data writing unit through a first node, the second end of the first transistor is connected to the anode of the display light-emitting unit through a second node, the storage unit is connected to the first node and the second node, and the initialization unit is used to write the second scan line signal to the second node in response to the third scan line signal. The compensation unit controls the threshold voltage of the first transistor to be written into the storage unit, and also serves as a light-emitting control unit to control the light-emitting unit to emit light, thereby eliminating the light-emitting control unit, reducing the complexity of the display driving circuit, reducing the space occupied by the signal routing and transistors on the display panel, and improving the aperture ratio of the display panel.

[0028] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of the display driving circuit in the first embodiment of the present application.

[0032] Figure 2 It is a timing diagram of the scan signal and the data signal in the first embodiment of the present application.

[0033] Figure 3 This is a schematic diagram of the initialization phase in Example 1 of the present application.

[0034] Figure 4 This is a schematic diagram of the compensation stage in Example 1 of the present application.

[0035] Figure 5 This is a schematic diagram of the data writing phase in Example 1 of the present application.

[0036] Figure 6 This is a schematic diagram of the light-emitting stage in Example 1 of the present application.

[0037] Figure 7 It is a flow chart of the display driving method in the second embodiment of the present application.

[0038] Figure 8 It is a result schematic diagram of the display panel in the third embodiment of the present application.

[0039] Description of reference numerals:

[0040] 100, display driving circuit; 110, first transistor; 120, compensation unit; 121, second transistor; 130, data writing unit; 131, third transistor; 140, initialization unit; 141, fourth transistor; 150, storage unit;

[0041] 200. Display light-emitting unit. DETAILED DESCRIPTION

[0042] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0043] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0044] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0045] Embodiment 1

[0046] See also Figure 1 As shown, the display driving circuit 100 in this embodiment includes a first transistor 110, a compensation unit 120, a data writing unit 130, an initialization unit 140 and a storage unit 150, wherein the first transistor 110 is a driving transistor, and the storage unit 150 includes a capacitor.

[0047] The data writing unit 130 is connected to the first scan line, the data line and the control end of the first transistor 110, and is used to write the data voltage Vdata of the data line in response to the first scan line signal G1 (i.e., the first scan signal). The compensation unit 120 is connected to the second scan line, the first power supply and the first end of the first transistor 110, and is used to write the first power supply voltage Vdd in response to the second scan line signal G2 (i.e., the second scan signal).

[0048] The control end of the first transistor 110 is connected to the data writing unit 130 through the first node A, the second end of the first transistor 110 is connected to the anode of the display light emitting unit 200 through the second node B, the cathode of the display light emitting unit 200 is connected to the second power supply, and the storage unit 150 is connected to the first node A and the second node B. The display light emitting unit 200 includes an organic light emitting diode, and the first power supply voltage Vdd is greater than the second power supply voltage Vss. The initialization unit 140 is connected to the third scan line, the second scan line and the second node B, and is used to write the second scan line signal G2 to the second node B in response to the third scan line signal G3 (i.e., the third scan signal).

[0049] See 2 and Figure 6 As shown, when the display driving circuit 100 works:

[0050] In the initialization stage T1, the initialization unit 140 responds to the third scan line signal G3 to write the second scan line signal G2 into the second node B, completes the initialization of the display light emitting unit 200, and turns on the first transistor 110;

[0051] In the compensation stage T2, the compensation unit 120 is turned on in response to the second scan line signal G2, so that the first power supply voltage Vdd can be written into the second node B until the first transistor 110 is turned off, thereby writing the threshold voltage Vth of the first transistor 110 into the storage unit 150;

[0052] In the compensation stage T3, the data writing unit 130 writes the data voltage Vdata of the data line into the first node A in response to the first scan line signal G1;

[0053] In the light-emitting stage T4, the compensation unit 120 is turned on in response to the second scan line signal G2, and the first power supply is turned on through the compensation unit 120, the first transistor 110, the display light-emitting unit 200 and the second power supply, so that the driving circuit flows through the display light-emitting unit 200, driving the display light-emitting unit 200 to emit light, that is, the display light-emitting unit 200 is controlled to emit light through the compensation unit 120.

[0054] In order to compensate for the display unevenness caused by the difference in threshold voltage, the existing display panel is provided with a complex display driving circuit. The display driving circuit includes a driving transistor, a data writing unit, a storage unit, a compensation unit, a reset unit and a light emitting control unit, etc. The driving circuit structure is complex, and the signal wiring and transistors occupy a large space of the display panel, which reduces the aperture ratio of the display panel.

[0055] In this embodiment, the display driving circuit 100 includes a first transistor 110, a compensation unit 120, a data writing unit 130, an initialization unit 140 and a storage unit 150. The data writing unit 130 is used to write a data voltage Vdata of a data line in response to a first scan line signal G1. The compensation unit 120 is used to write a first power supply voltage Vdd in response to a second scan line signal G2. The control end of the first transistor 110 is connected to the data writing unit 130 through a first node A. The second end of the first transistor 110 is connected to the anode of the display light emitting unit 200 through a second node B. The storage unit 150 is connected to the first node A and the second node B. The initialization unit 140 is used to write the second scan line signal G2 into the second node B in response to a third scan line signal G3. The compensation unit 120 controls the threshold voltage Vth of the first transistor 110 to be written into the storage unit 150, and also serves as a light emitting control unit to control the light emitting unit 200 to emit light. The light emitting control unit is omitted, the complexity of the display driving circuit 100 is reduced, the space occupied by the signal routing and transistors on the display panel is reduced, and the aperture ratio of the display panel is improved.

[0056] See also Figure 1 As shown, the compensation unit 120 includes a second transistor 121 , a control end of the second transistor 121 is connected to the second scan line, a first end of the second transistor 121 is connected to the first power supply, and a second end of the second transistor 121 is connected to the first end of the first transistor 110 .

[0057] The compensation unit 120 is a transistor (i.e., the second transistor 121), and the control of the threshold voltage Vth writing and the display light-emitting unit 200 emitting light are both completed by the second transistor 121. The compensation unit 120 has a simple structure, which reduces the complexity of the display driving circuit 100, reduces the signal routing and transistor occupied display panel space, and improves the aperture ratio of the display panel.

[0058] See also Figure 1 As shown, the data writing unit 130 includes a third transistor 131, a control end of the third transistor 131 is connected to the first scan line, a first end of the third transistor 131 is connected to the data line, and a second end of the third transistor 131 is connected to the first node A. The initialization unit 140 includes a fourth transistor 141, a control end of the fourth transistor 141 is connected to the third scan line, a first end of the fourth transistor 141 is connected to the second scan line, and a second end of the fourth transistor 141 is connected to the second node B.

[0059] The data writing unit 130 and the initialization unit 140 are each a transistor, and the display driving circuit 100 is composed of four transistors and one capacitor, that is, the display driving circuit 100 is a 4T1C circuit. The display driving circuit 100 has a simple structure, reduces the signal routing and transistors occupying the display panel space, and improves the aperture ratio of the display panel.

[0060] In some embodiments, the first transistor 110, the second transistor 121, the third transistor 131 and the fourth transistor 141 are all N-type thin film transistors. The control terminal, the first terminal and the second terminal of the first transistor 110, the second transistor 121, the third transistor 131 and the fourth transistor 141 may be the gate, the drain and the source thereof, respectively.

[0061] When the four transistors of the display driving circuit 100 are all N-type thin film transistors, the manufacturing cost of the display driving circuit 100 is lower.

[0062] It should be noted that the first transistor 110, the second transistor 121, the third transistor 131 and the fourth transistor 141 may all be N-type thin film transistors, but are not limited thereto. Some or all of the first transistor 110, the second transistor 121, the third transistor 131 and the fourth transistor 141 may also be P-type thin film transistors, depending on the specific circumstances.

[0063] In some embodiments, the data voltage Vdata includes a non-display voltage Vd1 or a display voltage Vd2, the non-display voltage Vd1 controls the voltage of the first node A, and the display voltage Vd2 is used to control the opening degree of the first transistor 110, that is, to control the brightness of the display light-emitting unit 200. The low-level voltage of the second scan line signal is Vgl, the threshold voltage of the first transistor 110 is Vth, and Vd1-Vgl>Vth. For ease of calculation, the non-display voltage Vd1 can be 0, that is, -Vgl>Vth. For example, the threshold voltage Vth of the first transistor 110 is 0.5V~2V, and the low-level voltage Vgl of the second scan line signal is -6V~-3V.

[0064] In the initialization stage T1, the first scan line signal G1 and the third scan line signal G3 are at a high level, the second scan line signal G2 is at a low level, and the data voltage Vdata is the non-display voltage Vd1, then the third transistor 131 and the fourth transistor 141 are turned on, and the second transistor 121 is turned off. For the first transistor 110, its gate voltage is the voltage Va of the first node A, and its source voltage is the voltage Vb of the second node B. Its gate-source voltage difference Vgs=Va-Vb=Vd1-Vgl. Since Vd1-Vgl>Vth, the first transistor 110 is turned on.

[0065] In some embodiments, the difference between the low level voltage Vgl of the second scan line signal and the second power voltage Vss is smaller than the turn-on voltage Vo of the display light emitting unit 200 .

[0066] In the initialization stage T1, the fourth transistor 141 is turned on, and the voltage Vb of the second node B is equal to the low level voltage Vgl of the second scan line signal. The difference between the low level voltage Vgl of the second scan line signal and the second power supply voltage Vss is smaller than the turn-on voltage Vo of the display light-emitting unit 200, so that the voltage difference between the anode and cathode of the display light-emitting unit 200 is smaller than its turn-on voltage Vo, thereby ensuring that the display light-emitting unit 200 does not emit light.

[0067] In some embodiments, the low level voltage Vgl of the second scan line signal G2 is less than the second power supply voltage Vss. For example, the second power supply voltage Vss is 0, and the low level voltage Vgl of the second scan line signal is -6V to -3V.

[0068] When the display light-emitting unit 200 is driven by direct current, the light-emitting material of the display light-emitting unit 200 is always subjected to a forward bias voltage, and defects in the light-emitting material will capture space charges. As the light-emitting time increases, a built-in electric field will be formed inside the light-emitting material due to the accumulation of space charges, and the light-emitting efficiency of the display light-emitting unit 200 will decrease.

[0069] In the initialization stage T1, the fourth transistor 141 is turned on, the voltage Vb of the second node B is equal to the low-level voltage Vgl of the second scan line signal, and the low-level voltage Vgl of the second scan line signal G2 is less than the second power supply voltage Vss, so that the cathode and anode potentials of the display light-emitting unit 200 are reversed, that is, the built-in electric field formed by the forward bias of the display light-emitting unit 200 is eliminated, thereby improving the luminous efficiency of the display light-emitting unit 200.

[0070] In some embodiments, the data voltage Vdata includes a non-display voltage Vd1 or a display voltage Vd2, the threshold voltage of the first transistor is Vth, the voltage of the second power supply is Vss, and Vd1-Vth<Vss. For ease of calculation, the non-display voltage Vd1 can be 0, that is, -Vth<Vss. For example, the threshold voltage Vth of the first transistor 110 is 0.5V~2V, and the second power supply voltage Vss is 0.

[0071] In the compensation stage T2, the first scan line signal G1 and the second scan line signal G2 are at a high level, the third scan line signal G3 is at a low level, the second transistor 121 and the third transistor 131 are turned on, and the fourth transistor 141 is turned off. Since the first transistor 110 is turned on in the initialization stage T1, the first power supply voltage Vdd is written into the second node B through the second transistor 121 and the first transistor 110 to charge the storage unit 150 until the first transistor 110 is turned off when Vgs=Va-Vb=Vth. Since the voltage Vb of the second node B is -Vth, and -Vth<Vss, the display light-emitting unit 200 does not emit light.

[0072] In summary, when the display driving circuit 100 is working:

[0073] In the initialization stage T1, the first scan line signal G1 and the third scan line signal G3 are at a high level, the second scan line signal G2 is at a low level, and the data voltage Vdata is the non-display voltage Vd1, then the third transistor 131 and the fourth transistor 141 are turned on, and the second transistor 121 is turned off. For the first transistor 110, its gate-source voltage difference Vgs=Va-Vb=Vd1-Vgl, because Vd1=0, -Vgl>Vth, the first transistor 110 is turned on, and because Vgl<Vss, the cathode and anode potentials of the display light-emitting unit 200 are reversed, and the initialization of the display light-emitting unit 200 is completed;

[0074] In the compensation stage T2, the first scan line signal G1 and the second scan line signal G2 are at a high level, the third scan line signal G3 is at a low level, the second transistor 121 and the third transistor 131 are turned on, and the fourth transistor 141 is turned off. Since the first transistor 110 is turned on in the initialization stage T1, the first power supply voltage Vdd is written into the second node B via the second transistor 121 and the first transistor 110 to charge the storage unit 150 until Vgs=Va-Vb=Vth, and the first transistor 110 is turned off. The voltage difference across the storage unit 150 is the threshold voltage Vth of the first transistor 110, that is, the threshold voltage Vth of the first transistor 110 is written into the storage unit 150.

[0075] In the data writing phase T3, the first scan line signal G1 is at a high level, the second scan line signal G2 and the third scan line signal G3 are at a low level, the third transistor 131 is turned on, the second transistor 121 and the fourth transistor 141 are turned off, the data voltage Vdata is the display voltage Vd2, the first node A voltage Va changes from Vd1 to Vd2, according to the capacitive coupling and charge conservation, the second node B voltage Vb changes to -Vth+(C / (C+Co))×Vd2, where C is the capacitance value of the storage unit 150, and Co is the capacitance value of the display light emitting unit 200. For the first transistor 110, Vgs=Va-Vb=Vd2-(-Vth+(C / (C+Co))×Vd2)=Vth+(Co / (C+Co))×Vd2>Vth, and the first transistor 110 is turned on again;

[0076] In the light-emitting stage T4, the second scan line signal G2 is at a high level, the first scan line signal G1 and the third scan line signal G3 are at a low level, the second transistor 121 is turned on, the third transistor 131 and the fourth transistor 141 are turned off, the storage unit 150 maintains the first transistor 110 turned on, and the current flows through the display light-emitting unit 200 through the second transistor 121 and the first transistor 110, driving the display light-emitting unit 200 to emit light.

[0077] In the light-emitting stage T4, the second power supply voltage Vss is 0, the second node B voltage Vb becomes Vo, and according to capacitive coupling and charge conservation, the first node A voltage Va is:

[0078] Va=Vth+(Co / (C+Co))×Vd2+Vo.

[0079] The driving current Io flowing through the display light emitting unit 200 is:

[0080] Io=1 / 2×k×(Vgs-Vth) 2 .

[0081] Taking into account the gate-source voltage difference Vgs of the first transistor 110, the driving current Io is:

[0082] Io=1 / 2×k×(Va-Vb-Vth) 2 .

[0083] Taking the voltage Va of the first node A and the voltage Vb of the second node B into consideration, the driving current Io is:

[0084] Io=1 / 2×k×(Vth+(Co / (C+Co))×Vd2+Vo-Vo-Vth) 2 .

[0085] Simplified, the driving current Io is:

[0086] Io=1 / 2×k×((Co / (C+Co))×Vd2) 2 .

[0087] Wherein, k=μ×Cox×W / L, μ is the electron mobility, Cox is the gate insulation layer capacitance, and W and L are the channel width and length of the first transistor 110 respectively.

[0088] According to the calculation formula of the driving current Io, when the display light-emitting unit 200 finally emits light, the driving current Io is not affected by the power supply voltage, the threshold voltage Vth of the first transistor 110, and the turn-on voltage Vo of the display light-emitting unit 200, thereby eliminating the influence of the power supply voltage, the threshold voltage Vth of the first transistor 110, and the turn-on voltage Vo of the display light-emitting unit 200 on the uniformity of the light-emitting brightness. At the same time, the capacitance value C of the storage unit 150 can be designed to be small, at the pF level, so that it is much smaller than the capacitance value Co (nF level) of the display light-emitting unit 200, so that Io≈1 / 2×k×Vd2 2 , thereby further eliminating the influence of the capacitance value Co of the display light emitting unit 200.

[0089] Embodiment 2

[0090] The present application also provides a display driving method for driving the display driving circuit 100. Figure 7 As shown, the display driving method includes:

[0091] S100: In the initialization stage, the compensation unit 120 is controlled to be turned off and the data writing unit 130 and the initialization unit 140 are controlled to be turned on, and the data voltage is maintained as a non-display voltage, so that the low level voltage of the second scan line is written into the second node B, and the first transistor 110 is turned on;

[0092] S200: In the compensation stage, the compensation unit 120 and the data writing unit 130 are controlled to be turned on and the initialization unit 140 is controlled to be turned off, and the data voltage is maintained as a non-display voltage, so that the threshold voltage of the first transistor 110 is written into the storage unit 150, and the first transistor 110 is turned off;

[0093] S300: In the data writing stage, the compensation unit 120 and the initialization unit 140 are controlled to be turned off and the data writing unit 130 is controlled to be turned on, the data voltage is switched to the display voltage, and the first transistor 110 is turned on again;

[0094] S400: In the light-emitting stage, the compensation unit 120 is controlled to be turned on and the data writing unit 130 and the initialization unit 140 are controlled to be turned off, and the data voltage is switched to a non-display voltage, so that the display light-emitting unit 200 emits light.

[0095] In the compensation stage, the compensation unit 120 is controlled to be turned on so that the threshold voltage Vth of the first transistor 110 can be written into the storage unit. In the light-emitting stage, the compensation unit 120 is controlled to be turned on. The compensation unit 120 also serves as a light-emitting control unit to control the display light-emitting unit 200 to emit light, thereby eliminating the light-emitting control unit, reducing the complexity of the display driving circuit 100, reducing the space occupied by signal routing and transistors on the display panel, and improving the aperture ratio of the display panel.

[0096] Embodiment 3

[0097] See also Figure 8 As shown, the display panel in this embodiment includes the display driving circuit 100 and the display light emitting unit 200 disclosed in the first embodiment, and the display light emitting unit 200 is connected to the display driving circuit 100 .

[0098] In this embodiment, the display panel includes a display driving circuit 100, which includes a first transistor 110, a compensation unit 120, a data writing unit 130, an initialization unit 140 and a storage unit 150. The data writing unit 130 is used to write a data voltage Vdata of a data line in response to a first scan line signal G1, the compensation unit 120 is used to write a first power supply voltage Vdd in response to a second scan line signal G2, the control end of the first transistor 110 is connected to the data writing unit 130 through a first node A, the second end of the first transistor 110 is connected to an anode of a display light emitting unit 200 through a second node B, the storage unit 150 is connected to the first node A and the second node B, and the initialization unit 140 is used to write the second scan line signal G2 into the second node B in response to a third scan line signal G3. The compensation unit 120 controls the threshold voltage Vth of the first transistor 110 to be written into the storage unit 150 and also serves as a light emitting control unit to control the display light emitting unit 200 to emit light, thereby eliminating the light emitting control unit, reducing the complexity of the display driving circuit 100, reducing the space occupied by signal routing and transistors in the display panel, and improving the aperture ratio of the display panel.

Claims

1. A display driving circuit, comprising a data writing unit and a first transistor, wherein the data writing unit is connected to a first scan line, a data line and a control end of the first transistor, and is used to write a data voltage of the data line in response to a signal of the first scan line, wherein: The display driving circuit further includes: a compensation unit connected to the second scan line, the first power supply and the first end of the first transistor, and configured to write the first power supply voltage in response to the second scan line signal during a compensation phase and a light emitting phase; A storage unit, wherein the control end of the first transistor is connected to the data writing unit through a first node, the second end of the first transistor is connected to the anode of the display light-emitting unit through a second node, the cathode of the display light-emitting unit is connected to a second power supply, the first power supply voltage is greater than the second power supply voltage, and the storage unit is connected to the first node and the second node; an initialization unit, connected to the third scan line, the second scan line and the second node, and used to write the second scan line signal in response to the third scan line signal in an initialization phase, so that the first transistor is turned on, and the low level voltage of the second scan line signal is less than the second power supply voltage; The data voltage includes a non-display voltage and a display voltage, and the data writing unit is used to respond to the first scan line signal, write the non-display voltage in the initialization stage and the compensation stage, and write the display voltage in the data writing stage.

2. The display driving circuit according to claim 1, characterized in that: The compensation unit includes a second transistor, a control end of the second transistor is connected to the second scan line, a first end of the second transistor is connected to the first power supply, and a second end of the second transistor is connected to the first transistor.

3. The display driving circuit according to claim 2, characterized in that: The data writing unit comprises a third transistor, a control end of the third transistor is connected to the first scan line, a first end of the third transistor is connected to the data line, and a second end of the third transistor is connected to the first node; The initialization unit includes a fourth transistor, a control terminal of the fourth transistor is connected to the third scan line, a first terminal of the fourth transistor is connected to the second scan line, and a second terminal of the fourth transistor is connected to the second node.

4. The display driving circuit according to claim 3, characterized in that: The first transistor, the second transistor, the third transistor and the fourth transistor are all N-type thin film transistors.

5. The display driving circuit according to claim 1, characterized in that: The non-display voltage is Vd1, the display voltage is Vd2, the low level voltage of the second scan line signal is Vgl, the threshold voltage of the first transistor is Vth, and Vd1-Vgl>Vth.

6. The display driving circuit according to claim 1, characterized in that: The non-display voltage is Vd1, the display voltage is Vd2, the threshold voltage of the first transistor is Vth, the voltage of the second power supply is Vss, and Vd1-Vth<Vss.

7. A display driving method, characterized in that: The display driving method is used to drive the display driving circuit according to any one of claims 1 to 6, and the display driving method comprises: In the initialization stage, the compensation unit is controlled to be turned off and the data writing unit and the initialization unit are controlled to be turned on, the data voltage is maintained as a non-display voltage, so that the low level voltage of the second scan line is written into the second node, and the first transistor is turned on; In the compensation stage, the compensation unit and the data writing unit are controlled to be turned on and the initialization unit is controlled to be turned off, the data voltage is maintained as a non-display voltage, so that the threshold voltage of the first transistor is written into the storage unit and the first transistor is turned off; In the data writing stage, the compensation unit and the initialization unit are controlled to be turned off and the data writing unit is controlled to be turned on, the data voltage is switched to the display voltage, and the first transistor is turned on again; In the light-emitting stage, the compensation unit is controlled to be turned on and the data writing unit and the initialization unit are controlled to be turned off, so that the display light-emitting unit emits light.

8. A display panel, characterized in that: include: The display driving circuit according to any one of claims 1 to 6; The display light emitting unit is connected to the display driving circuit.

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