CN116364009A - A circuit for eliminating bright spots and a display substrate - Google Patents

Abstract

The embodiment of the present application provides a circuit for eliminating bright spots and a display substrate, which relate to the field of display technology, and there is metal residue, which causes the OLED anode and the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit to form a short circuit , and by connecting the control end of the auxiliary sub-circuit to the control signal line, the first end is connected to the anode of the OLED, and the second end of the auxiliary sub-circuit is connected to the external power line. The circuit can transmit the voltage signal of the external power line to the anode point of the OLED, and the external power line forms a loop with the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit, based on the heat generated when the current passes through. The circuit is shorted and fused, so that the anode point is disconnected from the VDD and/or Vdata short point, thereby eliminating the permanent bright spot caused by the short circuit of the residual metal, and improving the picture quality.

Description

A circuit for eliminating bright spots and a display substrate

technical field

The present application relates to the field of display technology, in particular to a circuit for eliminating bright spots and a display substrate.

Background technique

During the production process of the AMOLED (Active-Matrix Organic Light Emitting Diode, active light-emitting matrix diode) backplane, due to process problems, metal residues will be left in the circuit, so that the OLED (Organic Electroluminescence Display, organic electroluminescence display) anode and VDD ( Signal lines such as the positive pole of the power supply) and/or Data (data signal terminal) are short-circuited by residual metal, which causes the pixels to be always on when the signal is written, which affects the display quality.

Contents of the invention

The purpose of the embodiments of the present application is to provide a circuit for eliminating bright spots and a display substrate to solve the problem of constant bright pixels caused by the short circuit between the OLED anode and signal lines such as VDD and/or Data, and improve the display quality. The specific technical scheme is as follows:

An embodiment of the present application provides a circuit for eliminating bright spots, and the circuit includes:

A pixel subcircuit, an auxiliary subcircuit; the pixel subcircuit includes an organic light emitting diode;

The control terminal of the auxiliary sub-circuit is connected to the control signal line, the first end of the auxiliary sub-circuit is connected to the anode of the organic light emitting diode, and the second end of the auxiliary sub-circuit is connected to an external power line;

Wherein, in the case of the control signal inputting the turn-on signal, the auxiliary sub-circuit transmits the voltage signal of the external power line to the anode point of the organic light emitting diode, so that the anode point and the The first power supply end of the pixel sub-circuit and/or the short circuit of the data signal end of the pixel sub-circuit are fused due to heat generated by the current; wherein, the first power supply end is connected to the positive pole of the power supply.

In a possible implementation manner, the auxiliary subcircuit includes an eleventh transistor, the gate of the eleventh transistor is connected to the control signal line, and the first electrode of the eleventh transistor is connected to the The anode of the organic light emitting diode is connected, and the second electrode of the eleventh transistor is connected to the external power line.

In a possible implementation manner, the auxiliary subcircuit further includes a plurality of switching transistors,

For each switch transistor, the gate of the switch transistor is connected to the control signal line, the first electrode of the switch transistor is connected to the external power supply line, and the second electrode of the switch transistor is connected to the first electrode of the eleventh transistor. The two electrodes are connected.

In a possible implementation manner, the auxiliary subcircuit includes an eighth transistor, a ninth transistor, and a tenth transistor;

The gate of the eighth transistor is connected to the control signal line, the first electrode of the eighth transistor is connected to the external power line, and the second electrode of the eighth transistor is connected to the first electrode of the eleventh transistor. Two electrode connections;

The gate of the ninth transistor is connected to the control signal line, the first electrode of the ninth transistor is connected to the external power line, and the second electrode of the ninth transistor is connected to the first electrode of the eleventh transistor. Two electrode connections;

The gate of the tenth transistor is connected to the control signal line, the first electrode of the tenth transistor is connected to the external power supply line, the second electrode of the tenth transistor is connected to the first electrode of the eleventh transistor The two electrodes are connected.

In a possible implementation manner, the pixel sub-circuit includes:

Storage capacitor, first transistor, second transistor, third transistor, fourth transistor, fifth transistor, sixth transistor, seventh transistor;

The first terminal of the storage capacitor is connected to the first power supply terminal; the second terminal of the storage capacitor is respectively connected to the first terminal of the first transistor, the first terminal of the second transistor, and the first terminal of the second transistor. The gate connections of the three transistors;

The gate of the first transistor is connected to the reset signal control terminal, and the second terminal of the first transistor is respectively connected to the initial signal terminal and the second terminal of the seventh transistor;

The gate of the second transistor is connected to the gate control signal, and the second terminal of the second transistor is respectively connected to the first terminal of the third transistor and the first terminal of the sixth transistor;

The second end of the third transistor is respectively connected to the second end of the fifth transistor and the first end of the fourth transistor;

The gate of the fourth transistor is connected to the gate control signal, and the second terminal of the fourth transistor is electrically connected to the data signal terminal;

The gate of the fifth transistor is connected to the scan control signal, the first end of the fifth transistor is connected to the first power supply end,

The gate of the sixth transistor is electrically connected to the scanning control signal, and the second terminal of the sixth transistor is respectively connected to the anode of the organic light emitting diode and the first terminal of the seventh transistor;

The gate of the seventh transistor is connected to the gate control signal;

The cathode of the organic light emitting diode is connected to the second power supply terminal;

The first power supply terminal is connected to the positive pole of the power supply, and the second power supply terminal is connected to the negative pole of the power supply.

In a possible implementation, during the phase of eliminating bright spots:

The voltage of the second power supply terminal is not less than the voltage of the external power supply line;

The gate of the sixth transistor inputs an off voltage, the gate of the seventh transistor inputs an off voltage, and the gate of the fifth transistor inputs an off voltage; and/or

The gate of the sixth transistor receives an off voltage, the gate of the seventh transistor receives an off voltage, and the gate of the fourth transistor inputs an off voltage.

In a possible implementation manner, the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are all P-type thin film transistors;

The voltage of the external power line is a high-level signal;

The voltage of the first power supply terminal is a low-level signal, and the voltage of the data signal terminal is a low-level signal;

Both the voltage of the gate control signal and the voltage of the scan control signal are equal to the voltage of the external power line;

The voltage of the second power supply terminal is equal to the voltage of the external power supply line.

An embodiment of the present application also provides a display substrate, including a plurality of pixel sub-circuits in any of the circuits for eliminating bright spots described above, and at least one auxiliary sub-circuit.

In a possible implementation manner, all pixel sub-circuits correspond to one auxiliary sub-circuit.

In a possible implementation manner, for each row of pixel subcircuits, the row of pixel subcircuits corresponds to one auxiliary subcircuit.

In a possible implementation manner, the display substrate includes a display area, a left non-display area, and a right non-display area;

For each row of pixel subcircuits, the row of pixel subcircuits includes a left auxiliary subcircuit and a right auxiliary subcircuit, wherein the left auxiliary subcircuit is connected to the anode of the left organic light emitting diode of the row of pixel subcircuits, and the right The side auxiliary subcircuit is connected to the anode of the organic light emitting diode on the right side of the row of pixel subcircuits;

The left auxiliary sub-circuit is located in the left non-display area, the right auxiliary sub-circuit is located in the right non-display area, and the pixel sub-circuit is located in the display area.

In a possible implementation manner, the display substrate includes a display area and a non-display area;

The pixel sub-circuit is located in the display area, and the auxiliary sub-circuit is located in the non-display area.

In a possible implementation manner, the circuit for eliminating bright spots that is applied to the auxiliary subcircuit described above further includes a plurality of switching transistors;

The display substrate includes a display area and a non-display area;

The eleventh transistor is located in the display area, and the switching transistor is located in the non-display area.

Beneficial effects of the embodiment of the application:

The bright spot elimination circuit and the display substrate provided by the embodiment of the present application, due to metal residues, cause the OLED anode and the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit to form a short circuit, and the auxiliary sub-circuit The control end of the control terminal is connected to the control signal line, the first end is connected to the anode of the OLED, and the second end of the auxiliary sub-circuit is connected to the external power line, so that when the control signal is input to open the signal, the auxiliary sub-circuit can connect the external power line The voltage signal is transmitted to the anode point of the OLED, so that the external power line forms a loop with the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit, because heat can be generated when the current passes, based on the generated heat makes The short circuit between the anode point and the first power supply terminal of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit is fused, so that the anode point is disconnected from the VDD and/or Vdata short-circuit point, thereby eliminating the short circuit caused by the residual metal Constant bright spots, improve picture quality.

Of course, implementing any product or method of the present application does not necessarily need to achieve all the above-mentioned advantages at the same time.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present application, and those skilled in the art can also obtain other embodiments according to these drawings.

FIG. 1 is a schematic diagram of the first structure of the bright spot elimination circuit provided by the embodiment of the present application;

FIG. 2 is a schematic diagram of short-circuiting the OLED anode to VDD and/or Data in an OLED pixel circuit in the related art;

FIG. 3 is a second structural schematic diagram of the bright spot elimination circuit provided by the embodiment of the present application;

FIG. 4 is a schematic diagram of the third structure of the bright spot elimination circuit provided by the embodiment of the present application;

FIG. 5 is a schematic diagram of a fourth structure of the bright spot elimination circuit provided by the embodiment of the present application;

FIG. 6 is a schematic diagram of a pixel sub-circuit in a circuit for eliminating bright spots provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of a fifth structure of the bright spot elimination circuit provided by the embodiment of the present application;

FIG. 8 is a first schematic diagram of the current routing of the bright spot elimination circuit provided by the embodiment of the present application;

FIG. 9 is a second schematic diagram of the current routing of the bright spot elimination circuit provided by the embodiment of the present application;

FIG. 10 is a schematic diagram of the first structure of the display substrate provided by the embodiment of the present application;

FIG. 11 is a schematic diagram of the second structure of the display substrate provided by the embodiment of the present application;

FIG. 12 is a schematic diagram of a third structure of a display substrate provided by an embodiment of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art based on this application belong to the scope of protection of this application.

First, the transistors used in all embodiments of this application are described:

The transistors used in all the embodiments of the present application may be TFT (Thin Film Transistor, thin film transistor), field effect transistor or other devices with the same characteristics. In this application, for any transistor, the first terminal of the transistor is the source or the drain, and the second terminal of the transistor is the drain or the source corresponding to the first terminal. In an example, each transistor can be a TFT (Thin Film Transistor, thin film transistor), and specifically, an N-type TFT or a P-type TFT can be selected according to actual conditions. In an example, each transistor in the pixel driving circuit of the present application can be a MOS transistor, and the MOS transistor can be an N-type MOS transistor or a P-type MOS transistor, which can be selected according to the actual situation.

The embodiment of the present application provides a circuit for eliminating bright spots, see Fig. 1, Fig. 1 is a schematic diagram of the first structure of the circuit for eliminating bright spots provided by the embodiment of the present application, the circuit includes:

A pixel subcircuit, an auxiliary subcircuit; the pixel subcircuit includes an organic light emitting diode;

The control terminal of the auxiliary sub-circuit is connected to the control signal line, the first end of the auxiliary sub-circuit is connected to the anode of the organic light emitting diode of the pixel sub-circuit, and the second end of the auxiliary sub-circuit is connected to an external power line;

Wherein, when the above-mentioned control signal is input with a turn-on signal, the above-mentioned auxiliary sub-circuit transmits the voltage signal of the above-mentioned external power line to the anode point of the above-mentioned organic light emitting diode, so that the above-mentioned anode point and the first pixel sub-circuit The short circuit of the power supply terminal and/or the data signal terminal of the above-mentioned pixel sub-circuit is fused due to the heat generated by the current; wherein, the above-mentioned first power supply terminal is connected to the positive pole of the power supply.

The pixel sub-circuit is a circuit structure that controls the current flowing through the pixel sub-circuit OLED by driving the transistors in the pixel sub-circuit. The pixel sub-circuit includes an OLED. The pixel sub-circuit structure can be composed of 7 transistors and 1 storage capacitor The formed 7T1C structure can also be a 2T1C structure, 3T1C structure, 4T1C structure, 5T1C structure, 6T1C structure, 5T2C structure, 8T1C structure, 8T2C structure or 9T2C structure, etc., wherein T represents a transistor, and C represents a storage capacitor. All within the scope of protection of this application.

During the production process of the AMOLED backplane, due to process problems, metal residues will be left in the circuit, so that the OLED anode and VDD and/or Data signal lines are short-circuited through the residual metal, causing the pixels to be always bright when the signal is written, and the 7T1C structure As an example, refer to FIG. 2 , which is a schematic diagram of short-circuiting the OLED anode to VDD and/or Data in an OLED pixel circuit in the related art. Among them, VDD is the positive pole of the power supply, Vss is the negative pole of the power supply, Vdata is the data signal terminal, Reset is the reset signal control terminal, Vinit is the initial signal terminal, Gate is the gate control signal, and EM is the scan control signal. If the anode point is short-circuited with VDD and/or Vdata, when the signal is written, VDD and/or Vdata and Vss form a loop, and the pixel is always on.

The auxiliary sub-circuit can be designed based on the power switch tube. For example, the auxiliary sub-circuit includes a thin film transistor, and the number of the auxiliary sub-circuit can be set based on the actual situation. illustrate.

Due to metal residues, the OLED anode and the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit form a short circuit, and the control end of the auxiliary sub-circuit is connected to the control signal line, and the first end is connected to the control signal line. The anode of the OLED is connected, and the second end of the auxiliary sub-circuit is connected to the external power line, so that when the control signal is input to open the signal, the auxiliary sub-circuit can transmit the voltage signal of the external power line to the anode point of the OLED, thereby making the external The power line forms a loop with the first power terminal of the pixel sub-circuit and/or the data signal terminal of the pixel sub-circuit, because heat can be generated when the current passes through, and the anode point is connected to the first power terminal and the first power terminal of the pixel sub-circuit based on the generated heat. /or the data signal terminal of the pixel sub-circuit is short-circuited and fused, so that the anode point is disconnected from the VDD and/or Vdata short-circuit point, thereby eliminating the permanent bright spot caused by the short-circuit of the residual metal, improving the picture quality, and at the same time, reducing The proportion of bright spots and increase the proportion of shipped products.

In a possible implementation manner, referring to FIG. 3, FIG. 3 is a schematic diagram of a second structure of a circuit for eliminating bright spots provided by the embodiment of the present application. The auxiliary sub-circuit includes an eleventh transistor T11. The gate is connected to the control signal line, the first electrode of the eleventh transistor T11 is connected to the anode of the OLED, and the second electrode of the eleventh transistor T11 is connected to the external power line.

The auxiliary sub-circuit is set as a transistor, because the transistor has three electrodes, by inputting a control signal to the gate of the transistor, the first electrode of the transistor is connected to the anode of the OLED, and the second electrode of the transistor is connected to the external power line, so when the input to the transistor When the signal is turned on and the external power line supplies power, the eleventh transistor T11 can transmit the voltage signal of the external power line to the anode point of the OLED, and the external power line is connected with the first power terminal of the pixel sub-circuit and/or the pixel sub-circuit The data signal end forms a loop, because heat can be generated when the current passes, and based on the generated heat, the short circuit between the anode point and the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit is fused, so that the anode point Bits are disconnected from VDD and/or Vdata short contacts, thereby eliminating the permanent bright spots caused by residual metal short circuits and improving picture quality.

In a possible implementation manner, the auxiliary sub-circuit further includes a plurality of switch transistors, and for each switch transistor, the gate of the switch transistor is connected to the control signal line, and the first electrode of the switch transistor is connected to the external power line connected, the second electrode of the switching transistor is connected to the second electrode of the eleventh transistor.

The first electrodes of all switching transistors are connected to the external power supply line, and the second electrodes are connected to the second electrode of the eleventh transistor, that is to say, all switching transistors are connected in parallel. Therefore, the voltage of the external power supply line Under certain circumstances, the loop current between the anode point and the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit is the sum of the currents of the circuits of each switching transistor, so that the anode point and the pixel sub-circuit The loop current of the first power supply terminal and/or the data signal terminal of the pixel sub-circuit increases, and then the heat generated increases, and the time for the residual metal of the short contact to fuse is shortened.

In a possible implementation mode, refer to FIG. 4, which is a schematic diagram of the third structure of the circuit for eliminating bright spots provided by the embodiment of the present application. The above-mentioned auxiliary sub-circuit includes an eighth transistor T8, a ninth transistor T9, a tenth Transistor T10;

The gate of the eighth transistor T8 is connected to the control signal line, the first electrode of the eighth transistor T8 is connected to the external power line, the second electrode of the eighth transistor T8 is connected to the second electrode of the eleventh transistor T11 connect;

The gate of the ninth transistor T9 is connected to the control signal line, the first electrode of the ninth transistor T9 is connected to the external power supply line, the second electrode of the ninth transistor T9 is connected to the second electrode of the eleventh transistor T11 connect;

The gate of the tenth transistor T10 is connected to the control signal line, the first electrode of the tenth transistor T10 is connected to the external power supply line, the second electrode of the tenth transistor T10 is connected to the second electrode of the eleventh transistor T11 connect.

The auxiliary sub-circuit may include 3 switching transistors, the 3 switching transistors are the eighth transistor T8, the ninth transistor T9, and the tenth transistor T10, and the 3 transistors are connected in parallel. Therefore, when the voltage of the external power line is constant, The loop current between the anode point and the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit is the sum of the currents of the circuits of each switching transistor, so that the anode point and the first power supply end of the pixel sub-circuit And/or the loop current of the data signal terminal stroke of the pixel sub-circuit increases, and then the heat generated increases, and the time for the residual metal of the short contact to fuse is shortened.

In a possible implementation manner, refer to FIG. 5, which is a schematic diagram of a fourth structure of a circuit for eliminating bright spots provided by the embodiment of the present application. The first transistors of the eighth transistor T8, the ninth transistor T9, and the tenth transistor T10 are The electrodes are respectively connected to different external power sources. As shown in FIG. 5 , the first electrode of the eighth transistor T8 is connected to D1, the first electrode of the ninth transistor T9 is connected to D2, and the first electrode of the tenth transistor T10 is connected to D3. The voltage values of the three power supplies can be the same or different, and can be set based on actual conditions. The three transistors are connected to different external power sources, so that the voltage values input to the three power sources can be the same or different, when the anode point is connected to the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit. When the current is small, the voltage value of each external power supply can be adjusted appropriately, so that the loop current between the anode point and the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit increases, and the heat generated Increase, shorten the time for short contact residual metal fusing.

Wherein, T8, T9, T10 and T11 may be P-type thin film transistors, or N-type thin film transistors.

For example, T8, T9, T10 and T11 are all P-type thin film transistors, the OLED anode is connected to T11, the gate of T11 is controlled by EM-N signal, the source of T11 is connected to the drain of T8, T9 and T10, and three external The signal lines (D1, D2, D3) are connected to the sources of T8/T9/T10, and the gates of T8, T9, and T10 are all controlled by EM-N signals.

In a possible implementation manner, refer to FIG. 6, which is a schematic diagram of a pixel sub-circuit in a circuit for eliminating bright spots provided by an embodiment of the present application. The pixel sub-circuit includes:

Storage capacitor Cst, first transistor T1, second transistor T2, third transistor T3, fourth transistor T4, fifth transistor T5, sixth transistor T6, seventh transistor T7;

The first terminal of the storage capacitor Cst is connected to the first power supply terminal VDD; the second terminal of the storage capacitor Cst is connected to the first terminal of the first transistor T1, the first terminal of the second transistor T2 and the third terminal respectively. Gate connection of transistor T3;

The gate of the first transistor T1 is connected to the reset signal control terminal Reset, and the second terminal of the first transistor T1 is respectively connected to the initial signal terminal Vinit and the second terminal of the seventh transistor T7;

The gate of the second transistor T2 is connected to the gate control signal Gate, and the second end of the second transistor T2 is respectively connected to the first end of the third transistor T3 and the first end of the sixth transistor T6;

The second end of the third transistor T3 is respectively connected to the second end of the fifth transistor T5 and the first end of the fourth transistor T4;

The gate of the fourth transistor T4 is connected to the gate control signal Gate, and the second terminal of the fourth transistor T4 is electrically connected to the data signal terminal Vdata;

The gate of the fifth transistor T5 is connected to the scanning control signal EM, the first terminal of the fifth transistor T5 is connected to the first power supply terminal VDD,

The gate of the sixth transistor T6 is electrically connected to the scanning control signal EM, and the second end of the sixth transistor T6 is respectively connected to the anode of the organic light emitting diode OLED and the first end of the seventh transistor T7;

The gate of the seventh transistor T7 is connected to the gate control signal Gate;

The cathode of the organic light emitting diode OLED is connected to the first power supply terminal Vss;

The first power supply terminal VDD is connected to the positive pole of the power supply, and the first power supply terminal Vss is connected to the negative pole of the power supply.

The pixel sub-circuit has a 7T1C structure, as shown in Figure 7. Figure 7 is a schematic diagram of the fifth structure of the circuit for eliminating bright spots provided by the embodiment of the present application. The auxiliary sub-circuit includes 3 switching transistors, and the 3 switching transistors are the eighth transistor T8. Gates of the ninth transistor T9, the tenth transistor T10, T8, T9, and T10 are respectively connected to the control signal line EM-N.

The three transistors are connected to different external power sources, so that the voltage values input to the three power sources can be the same or different, when the anode point is connected to the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit. When the current is small, the voltage value of each external power supply can be adjusted appropriately, so that the loop current between the anode point and the first power supply end of the pixel sub-circuit and/or the data signal end of the pixel sub-circuit increases, and the heat generated Increase, shorten the time for short contact residual metal fusing.

Based on the embodiment shown in Figure 7, in a possible implementation manner, in the stage of eliminating bright spots:

The voltage of the second power supply terminal Vss is not less than the voltage of the external power line;

The gate of the sixth transistor T6 receives a shutdown voltage, the gate of the seventh transistor T7 receives a shutdown voltage, and the gate of the fifth transistor T5 receives a shutdown voltage; and/or

The gate of the sixth transistor T6 receives an off voltage, the gate of the seventh transistor T7 receives an off voltage, and the gate of the fourth transistor T4 receives an off voltage.

If it is determined that the constant bright spot of the pixel is caused by a short circuit caused by a foreign object during the process, the brightness needs to be eliminated. In the stage of eliminating bright spots, the voltage of the external power line is a high-level signal, and the voltage of the second power supply terminal should not be lower than that of the external The voltage of the power line prevents the current from flowing to the Vss end, so that the external power line and the Vss end cannot form a loop. Moreover, when the external power line D1, D2, and D3 output a high-level signal, VDD inputs a low level, and T5, The gate inputs of T6 and T7 are all off voltages, and T5, T6 and T7 are in the off state, then D1, D2, D3 and VDD form a loop at the same time, the connection point of T5 and VDD, the connection point of T6 and OLED anode No current flows through the connection point between T7 and OLED anode. Therefore, when D1, D2, D3 and VDD form a loop, while eliminating residual metal, it can also ensure that the connection point of the pixel sub-circuit is not damaged.

And/or, when the external power lines D1, D2, and D3 output high-level signals, VData inputs low-level, the gate inputs of T4, T6, and T7 are all off voltages, and T4, T6, and T7 are in the off state , while D1, D2, D3 and VData form a loop, no current flows through the connection point between T4 and VData, the connection point between T6 and OLED anode, and the connection point between T7 and OLED anode. When the loop is formed, while eliminating the residual metal, it can ensure that the connection point of the pixel sub-circuit is not damaged.

Based on the above embodiment, in a possible implementation manner, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, and the seventh transistor T7 are all P-type thin film transistors;

The voltage of the above-mentioned external power line is a high-level signal;

The voltage at the first power supply terminal is a low-level signal, and the voltage at the data signal terminal is a low-level signal;

The voltage of the gate control signal and the voltage of the scan control signal are equal to the voltage of the external power line;

The voltage of the second power supply terminal is equal to the voltage of the external power supply line.

The voltage of the gate control signal and the voltage of the scan control signal are equal to the voltage of the external power supply line, so that when the voltage of the external power supply line is a high-level signal, the fourth transistor T4, the fifth transistor T5, the sixth transistor T6, and the fourth transistor T4 The seven transistors T7 are all off, and the voltage of the second power supply terminal is equal to the voltage of the external power supply line, so that the current cannot flow to the Vss terminal, so that the external power supply line and the Vss terminal cannot form a loop. The voltage of the first power supply terminal is a low-level signal, and the voltage of the data signal terminal is a low-level signal, then when the external power supply line forms a loop with VDD and/or VData, the connection point between T5 and VDD and/or the connection between T4 and VData Point, the connection point between T6 and OLED anode, and the connection point between T7 and OLED anode have no current flow, therefore, when D1, D2, D3 forms a loop with VDD and/or VData, while eliminating the residual metal, the pixel sub- The connection points of the circuit are not destroyed.

The display panel generally adopts the driving method of GOA (Gate Driver on Array, array substrate row drive), wherein, the GOA circuit is controlled by the clock signal line, GOA generally includes EM GOA, and EM GOA includes ECB control signal line, ESTV control signal line , the ECK control signal line, the VGH control signal line and the VGL control signal line are mainly used to provide control signals required by the EM to drive at least one row of pixels. Specifically, ESTV represents the row driving clock signal of the EM, ECK represents the first EM clock signal, and ECB represents the second EM clock signal.

In a possible implementation manner, when the pixel sub-circuit has a constant bright spot, the cause of the bright spot can be determined, and the specific determination method is as follows:

Add the EMOFF screen, the voltage settings are as follows:

ESTV, VGH, Vdata, and VDD input high-level signals, and ECK, ECB, VGL, Vss, and Vinit all input low-level signals.

For example, set ESTV=7V, ECK=ECB=-7V, VGH=7V, VGL=-7V, VDD=4.6V, Vss=-2.4V, Vinit=-3V, Vdata=7V;

If the bright spot disappears, the DC0 screen will be judged to determine whether it is the bright spot caused by the breakdown of the T2 tube. If the bright spot still exists, it is judged that the bright spot is caused by the short circuit of the OLED anode caused by the residual metal or the tunneling of the T7 tube. Among them, DC0 screen, the voltage settings are as follows:

VGH=7V, VGL=-7V, VDD=Vss=Vinit=Vdata=0V

At this time, if the bright spot still exists, it is determined that the bright spot is caused by the tunneling of the T7 tube, and if the bright spot disappears, it is determined that the bright spot is caused by a short circuit of the OLED anode.

On the basis of the DC0 screen, pull up the VDD voltage to 4.6V. If a bright spot appears, it is judged that VDD and the OLED anode are short-circuited; on the basis of the DC0 screen, pull up the Vdata voltage to 7V. If the bright spot appears, it is judged that Vdata and the anode are shorted. .

Exemplary:

When VDD and anode are Short, the voltage setting at this time is as follows:

EM is set to DC high level, VGL=Vinit=Vdata=0V, VDD is set to a negative value, D1=D2=D3 is set to a positive value, VGH=EM=D1=D2=D3, Vss=D1=D2=D3.

As shown in Figure 8, the currents passing through D1, D2, and D3 are respectively I ₁ /I ₂ /I ₃ , which are connected in parallel at the source level of the T11 tube, and the current I _total passing through the T11 tube = I ₁ +I ₂ +I ₃ .

According to the voltage setting, at this time, the T7 and T6 tubes are closed, the Vss voltage value is consistent with D1, D2, and D3, and VDD is a negative value. A current loop is formed between D1, D2, D3, and VDD through residual metal. According to the heat formula Q=I ² RT, when the voltage is large enough, that is, the current is large, as time increases, the heat generated increases, the short-circuit foreign object can be fused, and the bright spot can also disappear. Among them, the voltages D1, D2, and D3 are different for different sizes of products. It is necessary to ensure that the heat generated by the current at the residual metal is sufficient to melt the residual metal and not burn the product. The specific voltage selection can be determined according to the type of residual metal. Taking small-sized products as an example, the voltage reference values are as follows:

D1=D2=D3=VGH=EM=Vss=18V, VDD=-13V, other DC signals are set to 0V, and the time can be set to 6min.

If the above reference voltage value cannot be completely eliminated, the voltage value and time can be increased appropriately.

When Vdata is short-circuited with the anode, the voltage is set as follows:

EM is set to DC high level, VGL=Vinit=VDD=0V, Vdata is set to a negative value, D1=D2=D3 is set to a positive value, VGH=EM=D1=D2=D3, Vss=D1=D2=D3.

As shown in Figure 9, the currents passing through D1, D2, and D3 are respectively I ₁ /I ₂ /I ₃ , which are connected in parallel at the source level of the T11 tube, and the current I _total passing through the T11 tube = I ₁ +I ₂ +I ₃ .

According to the voltage setting, at this time, T7 and T6 tubes are closed, the Vss voltage value is consistent with D1, D2, D3, Vdata is negative, and a current loop is formed between D1, D2, D3 and Vdata. According to the heat formula Q=I ² RT, When the voltage is large enough, that is, the current is large, as time goes by, the heat generated increases, the short-circuit foreign object is fused, and the bright spot disappears.

Among them, the voltages D1, D2, and D3 are different for different sizes of products. It is necessary to ensure that the heat generated by the current at the residual metal is sufficient to fuse the residual metal. The specific voltage selection can be determined according to the type of residual metal. Taking small-sized products as an example, the voltage reference values are as follows:

D1＝D2＝D3＝VGH＝EM＝Vss＝18V, Vdata＝-13V, other DC signals are set to 0V, and the time is set to 6min.

If the above reference voltage value cannot be completely eliminated, the voltage value and time can be increased appropriately.

The embodiment of the present application provides a display substrate, see Fig. 10, Fig. 10 is a schematic diagram of the first structure of the display substrate provided by the embodiment of the present application, including a plurality of circuits for eliminating bright spots in any of the above embodiments A pixel subcircuit, and at least one auxiliary subcircuit.

One auxiliary sub-circuit can correspond to one pixel sub-circuit, that is, the first end of one auxiliary sub-circuit is connected to the anode of only one OLED, so as to solve the problem that the OLED is always bright due to short circuit caused by foreign objects during the process. An auxiliary sub-circuit also corresponds to multiple pixel sub-circuits,

In a possible implementation manner, one auxiliary sub-circuit corresponds to all pixel sub-circuits, that is, the first end of one auxiliary sub-circuit is connected to the anodes of all OLEDs, and all OLEDs are normally short-circuited by foreign objects during the process. Brightness problems are resolved by the auxiliary sub-circuit.

In a possible implementation manner, one auxiliary subcircuit corresponds to a row of pixel subcircuits, that is, the first end of one auxiliary subcircuit is connected to the anode of a row of OLEDs, that is, for each row of pixel subcircuits, the The row pixel sub-circuit corresponds to one auxiliary sub-circuit. For each row of pixel sub-circuits, the auxiliary sub-circuit solves the problem of constant brightness of all OLEDs in this row due to foreign object short circuit during the process.

In a possible implementation manner, a row of pixel subcircuits corresponds to multiple auxiliary subcircuits. Specifically, the row of pixel subcircuits is determined according to the number of pixel subcircuits in a row and the threshold value corresponding to the number of pixel subcircuits corresponding to an auxiliary subcircuit. The number of auxiliary sub-circuits corresponding to the circuit, for example, the threshold of the number of pixel sub-circuits corresponding to an auxiliary sub-circuit is n, and the number of pixel sub-circuits in a row is m, then the number of auxiliary sub-circuits corresponding to a row of pixel sub-circuits is The quotient of m and n is rounded up.

After determining the number of auxiliary sub-circuits corresponding to the row of pixel sub-circuits, the pixel sub-circuits corresponding to each auxiliary sub-circuit can be determined. Specifically, the number of pixel sub-circuits corresponding to an auxiliary sub-circuit can be randomly extracted based on the threshold value Threshold pixel sub-circuits in the row to obtain the first target pixel sub-circuit, use the first target pixel sub-circuit as the pixel sub-circuit corresponding to the first auxiliary sub-circuit, and then randomly extract from the remaining pixel sub-circuits in the row The number of threshold pixel sub-circuits in the row is obtained to obtain the second target pixel sub-circuit, and the second target pixel sub-circuit is used as the pixel sub-circuit corresponding to the second auxiliary sub-circuit, and the rest are determined according to the above method until all auxiliary sub-circuits Each sub-circuit has its corresponding pixel sub-circuit determined. Or, according to the arrangement order of each pixel sub-circuit in each row of pixel sub-circuits, the determination is performed sequentially, for example, the threshold number of pixel sub-circuits corresponding to one auxiliary sub-circuit is 5, and the number of pixel sub-circuits in a row is 12, then It can be determined in sequence according to a preset order, for example, in order from left to right, the first five pixel sub-circuits correspond to an auxiliary sub-circuit, the sixth to tenth pixel sub-circuits correspond to an auxiliary sub-circuit, and finally Two correspond to an auxiliary subcircuit.

Alternatively, a row of pixel subcircuits corresponds to two auxiliary subcircuits, specifically, the left auxiliary subcircuit is connected to the anode of the organic light emitting diode OLED on the left side of the row of pixel subcircuits, and the right auxiliary subcircuit is connected to the row of pixel subcircuits The anode of the OLED on the right side is connected.

In a possible implementation manner, the above-mentioned display substrate includes a display area and a non-display area.

The pixel sub-circuit is placed in the display area, the auxiliary circuit is placed in the non-display area, and the wiring is on the same layer as the normal wiring.

In a possible implementation manner, the non-display area includes a left non-display area and a right non-display area; for each row of pixel sub-circuits, the row of pixel sub-circuits includes a left auxiliary sub-circuit and a right auxiliary sub-circuit, Wherein, the left auxiliary subcircuit is connected to the anode of the organic light emitting diode OLED on the left side of the row of pixel subcircuits, and the right auxiliary subcircuit is connected to the anode of the right organic light emitting diode OLED of the row of pixel subcircuits;

The left auxiliary sub-circuit is located in the left non-display area, the right auxiliary sub-circuit is located in the right non-display area, and the pixel sub-circuit is located in the display area.

The display substrate further includes a PAD area, wherein the PAD area is a crimping area, which is an area where the control signal lines and the leads of the external power lines are crimped. As shown in Figure 11, Figure 11 is a second structural schematic diagram of the display substrate provided by the embodiment of the present application, which is applied to the circuit for eliminating bright spots as shown in Figure 5 and Figure 7, wherein a row of pixel sub-circuits corresponds to two auxiliary The sub-circuit, the auxiliary sub-circuit includes T8, T9, T10, T11, the left auxiliary sub-circuit is connected to the anode of the organic light-emitting diode OLED on the left side of the row of pixel sub-circuits, and the right auxiliary sub-circuit is connected to the anode of the row of pixel sub-circuits The anode of the organic light-emitting diode OLED on the right is connected, then all the devices of the left auxiliary sub-circuit are located in the left non-display area, all the devices of the right auxiliary sub-circuit are located in the right non-display area, and the pixel sub-circuit is located in the display area. district.

Since a display substrate includes multiple pixel sub-circuits, if one auxiliary sub-circuit corresponds to all pixel sub-circuits, and if there is only one side of the non-display area, that is, all auxiliary sub-circuits are located on the same side, the wiring of the display substrate It will be very crowded and not conducive to heat dissipation. The non-display area is divided into left and right sides. For each row of pixel sub-circuits, the row of pixel sub-circuits includes a left auxiliary sub-circuit and a right auxiliary sub-circuit, which can optimize the circuit routing of the substrate and improve the safety of the display substrate.

In a possible implementation, it is applied to the circuit for eliminating bright spots as shown in Fig. 5 and Fig. 7;

The above display substrate includes a display area and a non-display area;

The eleventh transistor is located in the display area, and the switching transistor is located in the non-display area.

As shown in Figure 12, Figure 12 is a schematic diagram of the third structure of the display substrate provided by the embodiment of the present application, which is applied to the circuit for eliminating bright spots as shown in Figure 5 and Figure 7, and a row of pixel sub-circuits corresponds to two auxiliary sub-circuits , the auxiliary sub-circuit includes T8, T9, T10, T11, the left auxiliary sub-circuit is connected to the anode of the organic light-emitting diode OLED on the left side of the row of pixel sub-circuits, and the right side auxiliary sub-circuit is connected to the right side of the row of pixel sub-circuits The anode connection of the organic light-emitting diode OLED.

T11 is built into the pixel sub-circuit. That is, T11 of the auxiliary sub-circuit is built in the pixel sub-circuit and located in the display area, and T8, T9 and T10 of the auxiliary sub-circuit are located in the non-display area.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Each embodiment in this specification is described in a related manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiment of the display substrate, since it is basically similar to the embodiment of the circuit for eliminating bright spots, the description is relatively simple, and for relevant parts, please refer to the description of the method embodiment.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application are included within the protection scope of this application.

Claims (13)

1. A circuit for eliminating bright spots, characterized in that said circuit comprises: A pixel subcircuit, an auxiliary subcircuit; the pixel subcircuit includes an organic light emitting diode; The control terminal of the auxiliary sub-circuit is connected to the control signal line, the first end of the auxiliary sub-circuit is connected to the anode of the organic light emitting diode, and the second end of the auxiliary sub-circuit is connected to an external power line; Wherein, in the case of the control signal inputting the turn-on signal, the auxiliary sub-circuit transmits the voltage signal of the external power line to the anode point of the organic light emitting diode, so that the anode point and the The first power supply end of the pixel sub-circuit and/or the short circuit of the data signal end of the pixel sub-circuit are fused due to heat generated by the current; wherein, the first power supply end is connected to the positive pole of the power supply. 2. The circuit according to claim 1, wherein the auxiliary sub-circuit comprises an eleventh transistor, the gate of the eleventh transistor is connected to the control signal line, and the gate of the eleventh transistor The first electrode is connected to the anode of the organic light emitting diode, and the second electrode of the eleventh transistor is connected to the external power line. 3. The circuit according to claim 2, wherein the auxiliary sub-circuit further comprises a plurality of switching transistors, For each switch transistor, the gate of the switch transistor is connected to the control signal line, the first electrode of the switch transistor is connected to the external power supply line, and the second electrode of the switch transistor is connected to the first electrode of the eleventh transistor. The two electrodes are connected. 4. The circuit according to claim 3, wherein the auxiliary sub-circuit comprises an eighth transistor, a ninth transistor, and a tenth transistor; The gate of the eighth transistor is connected to the control signal line, the first electrode of the eighth transistor is connected to the external power line, and the second electrode of the eighth transistor is connected to the first electrode of the eleventh transistor. Two electrode connections; The gate of the ninth transistor is connected to the control signal line, the first electrode of the ninth transistor is connected to the external power line, and the second electrode of the ninth transistor is connected to the first electrode of the eleventh transistor. Two electrode connections; The gate of the tenth transistor is connected to the control signal line, the first electrode of the tenth transistor is connected to the external power supply line, the second electrode of the tenth transistor is connected to the first electrode of the eleventh transistor The two electrodes are connected. 5. The circuit according to claim 1, wherein the pixel sub-circuit comprises: Storage capacitor, first transistor, second transistor, third transistor, fourth transistor, fifth transistor, sixth transistor, seventh transistor; The first terminal of the storage capacitor is connected to the first power supply terminal; the second terminal of the storage capacitor is respectively connected to the first terminal of the first transistor, the first terminal of the second transistor, and the first terminal of the second transistor. The gate connections of the three transistors; The gate of the first transistor is connected to the reset signal control terminal, and the second terminal of the first transistor is respectively connected to the initial signal terminal and the second terminal of the seventh transistor; The gate of the second transistor is connected to the gate control signal, and the second terminal of the second transistor is respectively connected to the first terminal of the third transistor and the first terminal of the sixth transistor; The second end of the third transistor is respectively connected to the second end of the fifth transistor and the first end of the fourth transistor; The gate of the fourth transistor is connected to the gate control signal, and the second terminal of the fourth transistor is electrically connected to the data signal terminal; The gate of the fifth transistor is connected to the scan control signal, the first end of the fifth transistor is connected to the first power supply end, The gate of the sixth transistor is electrically connected to the scanning control signal, and the second terminal of the sixth transistor is respectively connected to the anode of the organic light emitting diode and the first terminal of the seventh transistor; The gate of the seventh transistor is connected to the gate control signal; The cathode of the organic light emitting diode is connected to the second power supply terminal; The first power supply terminal is connected to the positive pole of the power supply, and the second power supply terminal is connected to the negative pole of the power supply. 6. The circuit according to claim 5, characterized in that, in the stage of eliminating bright spots: The voltage of the second power supply terminal is not less than the voltage of the external power supply line; The gate of the sixth transistor inputs an off voltage, the gate of the seventh transistor inputs an off voltage, and the gate of the fifth transistor inputs an off voltage; and/or The gate of the sixth transistor receives an off voltage, the gate of the seventh transistor receives an off voltage, and the gate of the fourth transistor inputs an off voltage. 7. The circuit according to claim 6, wherein the fourth transistor, the fifth transistor, the sixth transistor, and the seventh transistor are all P-type thin film transistors; The voltage of the external power line is a high-level signal; The voltage of the first power supply terminal is a low-level signal, and the voltage of the data signal terminal is a low-level signal; Both the voltage of the gate control signal and the voltage of the scan control signal are equal to the voltage of the external power line; The voltage of the second power supply terminal is equal to the voltage of the external power supply line. 8. A display substrate, characterized in that it comprises a plurality of pixel sub-circuits in the circuit for eliminating bright spots according to any one of claims 1 to 7, and at least one auxiliary sub-circuit. 9. The display substrate according to claim 8, wherein all pixel sub-circuits correspond to one auxiliary sub-circuit. 10. The display substrate according to claim 8, wherein, for each row of pixel subcircuits, the row of pixel subcircuits corresponds to one auxiliary subcircuit. 11. The display substrate according to claim 8, wherein the display substrate comprises a display area, a left non-display area, and a right non-display area; For each row of pixel subcircuits, the row of pixel subcircuits includes a left auxiliary subcircuit and a right auxiliary subcircuit, wherein the left auxiliary subcircuit is connected to the anode of the left organic light emitting diode of the row of pixel subcircuits, and the right The side auxiliary subcircuit is connected to the anode of the organic light emitting diode on the right side of the row of pixel subcircuits; The left auxiliary sub-circuit is located in the left non-display area, the right auxiliary sub-circuit is located in the right non-display area, and the pixel sub-circuit is located in the display area. 12. The display substrate according to claim 8, characterized in that, the display substrate comprises a display area and a non-display area; The pixel sub-circuit is located in the display area, and the auxiliary sub-circuit is located in the non-display area. 13. The display substrate according to claim 8, characterized in that it is applied to the circuit for eliminating bright spots as claimed in claim 3 or 4; The display substrate includes a display area and a non-display area; The eleventh transistor is located in the display area, and the switching transistor is located in the non-display area.

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