CN117831436B - Display panel, repairing method and display device - Google Patents
Display panel, repairing method and display device Download PDFInfo
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Abstract
The invention discloses a display panel, a repairing method and a display device, and relates to the technical field of display, wherein the display panel comprises: the flip chip film is arranged on the non-display area of the display panel, is connected with the repair line arranged on the periphery of the display area of the display panel and is used for converting the repair digital signal on the repair line into a repair analog signal; the circuit compensation module is arranged in the non-display area and is used for accessing the repairing analog signal, compensating the repairing analog signal according to the input control signal to obtain a target repairing signal, transmitting the target repairing signal to the repairing line, and transforming the waveform of the repairing analog signal through the circuit compensation module, so that the transformed waveform can be driven by a precursor and then reduce the voltage, compensating the voltage of the repairing line, counteracting the load influence on the repairing line, improving the charging rate which can be achieved by the repairing line, reducing the charging rate to a certain extent, and even eliminating the defect of uneven display brightness of a display picture.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a repairing method and a display device.
Background
When the breakpoint problem occurs to the data line in the display panel, the position of the breakpoint can be repaired through the repair line, so that the breakpoint position in the data line can be charged continuously, and the repair of the data line is completed.
However, since the repair lines are disposed on two sides of the display panel, the repair lines have a longer path than the data lines, so that the load on the repair lines is larger, and the charging rate on the repair lines is insufficient, so that the display brightness of the data lines repaired by the repair lines is lower than that of the data lines in a normal state, and the display screen has a defect of uneven display brightness.
Disclosure of Invention
The invention mainly aims to provide a display panel, a repairing method and a display device, and aims to solve the technical problem of uneven display brightness caused by a data line repaired by a repairing line.
To achieve the above object, the present invention provides a display panel including:
the flip chip film is arranged on the non-display area of the display panel, is connected with a repair line arranged on the periphery of the display area of the display panel and is used for converting a repair digital signal on the repair line into a repair analog signal;
the circuit compensation module is arranged in the non-display area and is used for accessing the repair analog signal, compensating the repair analog signal according to the input control signal to obtain a target repair signal and transmitting the target repair signal to the repair line;
the repair line is used for compensating a voltage value according to the target repair signal so as to pull up the charging rate.
Optionally, the display panel further includes a controller, where the controller is connected to the circuit compensation module and is configured to transmit the control signal to the circuit compensation module;
The output state of the control signal is determined based on a frame start pulse signal, a data mark signal and a reset signal which are output by the controller, and when the controller detects a first time sequence point on the falling edge of a target data mark signal, the controller starts to output the control signal, wherein the target data mark signal is the first data mark signal after the falling edge of the frame start pulse signal;
When the controller detects a second timing point on the falling edge of the reset signal, the controller stops outputting the control signal.
Optionally, the circuit compensation module includes:
the phase shifting module is used for converting the square wave waveform of the repair analog signal and converting the square wave waveform into a sine waveform;
The input end of the inverting module is connected with the output end of the phase shifting module and is used for inverting the negative polarity waveform in the accessed sine waveform;
And the input end of the amplifying module is connected with the output end of the inverting module, and the output end of the amplifying module is connected with the repair line and is used for amplifying the repair analog signal after conversion and inversion and outputting the amplified repair analog signal as the target repair signal.
Optionally, the phase shifting module comprises a plurality of groups of phase shifting circuits which are sequentially connected in series, and the phase shifting circuit comprises a first capacitor and a first power which are connected in series;
the inverting module comprises an inverting control circuit, and the inverting control circuit comprises a first compensating switch tube, a second compensating switch tube and an inverter;
The input end of the first compensation switch tube and the input end of the second compensation switch tube are connected with the output end of the phase shifting module in a sharing way, the output end of the second compensation switch tube is connected with the input end of the phase inverter, and the output end of the phase inverter and the output end of the first compensation switch tube are connected with the input end of the amplifying module in a sharing way;
the amplifying module comprises an amplifying circuit, and the amplifying circuit comprises a first triode;
The base electrode of the first triode is connected to the connecting line of the first compensation switch tube and the inverter, the collector electrode of the first triode is connected to the positive signal output end of the circuit compensation module and the positive signal input end of the circuit compensation module respectively, and the emitter electrode of the first triode is connected to the negative signal output end of the circuit compensation module.
Optionally, the first compensation switch tube and the second compensation switch tube are respectively connected with the control signal, and based on the level state of the control signal, the first compensation switch tube and the second compensation switch tube respectively enter corresponding conducting states so as to selectively control the sine waveform in opposite phases;
When the control signal is in a high-level state, the first compensation switching tube enters a conducting state, the second compensation switching tube enters a cut-off state, and the positive polarity waveform in the sine waveform is directly connected through the conducting first compensation switching tube and is transmitted to the amplifying module;
When the control signal is in a low-level state, the first compensation switch tube enters an off state, the second compensation switch tube enters an on state, the negative polarity waveform in the sine waveform is transmitted into the inverter for inversion through the second compensation switch tube which is conducted, and the inverted negative polarity waveform is transmitted into the amplifying module.
Optionally, after the positive polarity waveform and the negative polarity waveform after the inversion are amplified by the base electrode of the first triode, the target repair signal is output from the collector electrode of the first triode, and the target repair signal is returned to the repair line.
Optionally, the repair line is configured to pull up the voltage value on a positive half-axis waveform of the positive polarity waveform and decrease the voltage value on a negative half-axis waveform of the positive polarity waveform according to the positive polarity waveform of the target repair signal;
And pulling up the voltage value on a negative half-axis waveform of the negative polarity waveform and reducing the voltage value on a positive half-axis waveform of the negative polarity waveform according to the negative polarity waveform of the target repair signal.
The invention also provides a method for repairing the display panel, which is applied to the display panel, and comprises the following steps:
transmitting a repair analog signal converted based on the flip chip film and a control signal generated by the controller into the circuit compensation module, compensating the repair analog signal according to the control signal through the circuit compensation module, and outputting a target repair signal;
Transmitting the target repair signal to the repair line, compensating the voltage value on the repair line according to the target repair signal, and increasing the charging rate on the repair line.
Optionally, the step of compensating the repair analog signal according to the control signal by the circuit compensation module and outputting a target repair signal includes:
the phase shifting module converts the square waveform of the accessed repair analog signal into a sine waveform, and then transmits the sine waveform into the inverting module;
the inverting module is used for carrying out selective inverting control on the sine waveform according to the received control signal, outputting a positive polarity waveform in the sine waveform to the amplifying module based on the selective inverting control, inverting a negative polarity waveform in the sine waveform and outputting the inverted positive polarity waveform to the amplifying module;
and amplifying the accessed positive polarity waveform and the negative polarity waveform after the inversion by the amplifying module, and outputting the amplified positive polarity waveform and the negative polarity waveform as the target repair signal.
In addition, in order to achieve the above object, the present invention also provides a display device, which includes the display panel and the backlight module, wherein the display panel is disposed on the light emitting side of the backlight module;
the display device further includes a memory, a processor, and a computer processing program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the repair method as described above.
The present invention provides a display panel of a display device, the display panel comprising: the flip chip film is arranged on the non-display area of the display panel, is connected with the repair line arranged on the periphery of the display area of the display panel and is used for converting the repair digital signal on the repair line into a repair analog signal so as to carry out compensation treatment on the signal on the repair line; the circuit compensation module is arranged in the non-display area and is used for accessing the repair analog signal, compensating the repair analog signal according to the input control signal to obtain a target repair signal, transmitting the target repair signal to the repair line, converting the waveform of the repair analog signal through the circuit compensation module, leading the converted waveform to be capable of driving and reducing the voltage again, compensating the voltage of the repair line, counteracting the load influence on the repair line, improving the charging rate achieved by the repair line, counteracting at least part of the voltage difference between the voltage value achieved by the repair line and the voltage value of the data line in the normal state, counteracting the display brightness difference between the display brightness achieved by the data line repaired by the repair line and the display brightness achieved by the data line in the normal state, and reducing the display brightness non-uniformity of the display picture to a certain extent.
Drawings
FIG. 1 is a schematic diagram of a terminal structure of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a display panel according to the present invention;
FIG. 3 is a schematic diagram of the connection of the controller and the circuit compensation module and the connection of the repair analog signals included in the display panel of the present invention;
FIG. 4 is a timing diagram of signals output by the controller according to the present invention;
FIG. 5 is a schematic diagram of a circuit compensation module according to the present invention;
FIG. 6 is a schematic circuit diagram of the circuit compensation module of the present invention;
FIG. 7 is a schematic diagram showing a comparison of a sinusoidal waveform and a square waveform outputted by the phase shifting module;
FIG. 8 is a schematic diagram showing a comparison of a sinusoidal waveform and a square waveform outputted by the inverting module;
FIG. 9 is a schematic diagram showing a comparison of a sinusoidal waveform and a square waveform outputted by the amplifying module;
FIG. 10 is a schematic diagram of the charging rate of a repair line based on a repair signal before compensation;
FIG. 11 is a schematic diagram of the charging rate of the repair line based on the compensated target repair signal;
fig. 12 is a flowchart of a repairing method of a display panel according to an embodiment of the invention.
Reference numerals illustrate:
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, fig. 1 is a schematic diagram of a terminal structure of a hardware running environment according to an embodiment of the present invention.
The terminal of the present invention is a display device, as shown in fig. 1, where the display device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
Optionally, the display device may also include an RF (Radio Frequency) circuit, a sensor, a WiFi module, and the like. Among them, sensors such as light sensor, motion sensor and others are not described herein.
It will be appreciated by those skilled in the art that the display device structure shown in fig. 1 is not limiting of the display device and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a computer processing program may be included in the memory 1005, which is a type of computer storage medium.
In the display device shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to call a computer processing program stored in the memory 1005 and perform the following operations:
transmitting a repair analog signal converted based on the flip chip film and a control signal generated by the controller into the circuit compensation module, compensating the repair analog signal according to the control signal through the circuit compensation module, and outputting a target repair signal;
Transmitting the target repair signal to the repair line, compensating the voltage value on the repair line according to the target repair signal, and increasing the charging rate on the repair line.
Further, the processor 1001 may call a computer processing program stored in the memory 1005, and further perform the following operations:
The step of compensating the repair analog signal according to the control signal through the circuit compensation module and outputting a target repair signal comprises the following steps: the phase shifting module converts the square waveform of the accessed repair analog signal into a sine waveform, and then transmits the sine waveform into the inverting module;
the inverting module is used for carrying out selective inverting control on the sine waveform according to the received control signal, outputting a positive polarity waveform in the sine waveform to the amplifying module based on the selective inverting control, inverting a negative polarity waveform in the sine waveform and outputting the inverted positive polarity waveform to the amplifying module;
and amplifying the accessed positive polarity waveform and the negative polarity waveform after the inversion by the amplifying module, and outputting the amplified positive polarity waveform and the negative polarity waveform as the target repair signal.
Referring to fig. 2, fig. 2 is a schematic structural view of a display panel of the present invention, the display panel including:
The COF is composed of a flexible substrate circuit with a driving chip, and is arranged on a non-display area of the display panel, and the driving chip is connected with a repair line L arranged at the periphery (30 in FIG. 2) of the display area of the display panel and used for converting a repair digital signal into a repair analog signal. When the breakpoint occurs on the data line, the data line of the breakpoint is independently led out for charging by connecting the repair line L to the breakpoint position.
The circuit compensation module 10 is disposed in the non-display area (i.e., the circuit board 40 in fig. 2), and is configured to access the repair analog signal, compensate the repair analog signal according to the incoming control signal, obtain a target repair signal, and transmit the target repair signal to the repair line L.
The repair line L is configured to compensate a voltage value according to the target repair signal to pull up a charging rate.
As shown in fig. 2, after the pixel at the point a is abnormal due to the influence of some foreign matters, and the breakpoint at the point a is performed by using the laser, in order to ensure that the upper half section of the breakpoint a can still be accessed to the data signal for displaying, the upper half section is accessed to the connection 12 by the laser at this time so as to be connected to the repair line L by the connection 12, so as to form a repaired data line L', and specific repair paths are ①、②, L and ③. Because the repair path of the repair line L is longer, the load on the repair path is larger, and the voltage output to the ③ is pulled down, that is, the charging rate on the repaired data line L 'is pulled down as a whole, so that the display brightness of the light emitting device driven by the repaired data line L' is smaller than the display brightness of the light emitting device driven by the data line 11 in a normal state, and the display brightness of the display screen is uneven. Because the voltage is transmitted from bottom to top in a normal state, when the display abnormality indication voltage at the point A caused by the poor data line is transmitted from bottom to top, the transmission can be normally performed on a section below the point A, and therefore the condition of display abnormality does not exist in the lower half section of the breakpoint A, and the lower half section of the breakpoint A does not need to be repaired.
Based on the above-described problems, the present embodiment proposes a display panel capable of solving the defect of uneven display brightness caused by the problems of the repair line L. The method comprises the following steps: the generated repair digital signals are converted into repair analog signals through the driving chip on the COF so that the circuit compensation module 10 included in the display panel can compensate the repair analog signals, and the compensated repair analog signals (namely target repair signals) can compensate the voltage on the repair line L, so that the charging rate on the data line repaired by the repair line L is increased, and the defect of uneven display brightness is avoided.
In fig. 2, 20 is a display panel, and in fig. 2, the connection 12 is used for repairing the trace of the laser connection of the line L, and when the upper half section is cut at the point a in fig. 2, the data signal is lost, so that the upper half section is laser-irradiated to the connection 12 to connect the repairing line L.
Specifically, referring to fig. 3, the display panel further includes a controller TCON, where the controller TCON is connected to the circuit compensation module 10 and is configured to transmit the control signal to the circuit compensation module 10, where the Repair signal in fig. 3 is a Repair analog signal;
The output state of the control signal is determined based on a frame start pulse signal, a data mark signal and a reset signal which are output by the controller TCON, and when the controller TCON detects a first time sequence point on the falling edge of a target data mark signal, the controller TCON starts to output the control signal, wherein the target data mark signal is the first data mark signal after the falling edge of the frame start pulse signal; when the controller TCON detects a second timing point on a falling edge of the reset signal, the controller TCON stops outputting the control signal.
The display panel in this embodiment further includes a controller TCON for controlling the compensation process of the circuit compensation module 10 for repairing the analog signal, where the controller TCON controls the waveform inversion of the repairing analog signal by transmitting a control signal to the circuit compensation module 10, so as to increase the charging rate of the target analog signal at a low level, and avoid the problem of uneven display brightness after voltage compensation, where the charging rate of the target analog signal at a low level is low.
In order to ensure that the output target repair signal can achieve effective voltage amplification, the output control signal and the data signal need to be synchronized, that is, the control signal and the data signal start to be output synchronously and stop to be output synchronously, which is described specifically with reference to fig. 4.
The control signal output by the controller TCON in this example is determined based on the frame start pulse signal (i.e., STV in fig. 4) output by itself, the data flag signal (i.e., TP signal in fig. 4), and the reset signal (i.e., REST in fig. 4). When the controller TCON starts outputting a frame start pulse signal and detects a falling edge of the outputted frame start pulse signal, a first falling edge of a data flag signal outputted after the falling edge of the frame start pulse signal is detected, and since the data flag signal can reflect an output state of the data signal, the first falling edge is determined as an output identification of the controller TCON starting outputting the control signal, and synchronous output of the control signal and the data signal can be ensured.
Meanwhile, after the controller TCON detects the falling edge of the output reset signal, it means that the display of the current frame picture is finished, and the data signal stops outputting, so that the falling edge of the reset signal is determined as the output identifier of the control signal stopping outputting by the controller TCON, and synchronous stopping of the control signal and the data signal can be ensured.
Note that CK in fig. 4 is a clock signal, and a portion where a high level of the clock signal overlaps a high level of the control signal is a charging time.
Specifically, referring to fig. 5, the circuit compensation module 10 includes:
and the phase shifting module 101 is used for transforming the square wave waveform of the repair analog signal and transforming the square wave waveform into a sine wave waveform. Because the square waveform has flat characteristics, the voltage output by the repair analog signal of the square waveform is constant and has no trend of pulling up and down, so the repair analog signal of the square waveform cannot well compensate the voltage of the repair line L, and the sine waveform can monotonically increase or decrease in a certain time. The present example thus provides the phase shift module 101 in the circuit compensation module 10, so that the repair analog signal of the square waveform is phase shifted by the phase shift module 101, and the square waveform is converted into a sinusoidal waveform that is advantageous for compensating the voltage on the repair line L.
And the input end of the inverting module 102 is connected with the output end of the phase shifting module 101, and is used for inverting the negative polarity waveform in the accessed sine waveform. Because the sinusoidal waveform generated after the phase shift based solely on the phase shift module 101 is a continuous and periodically recurring waveform. As is clear from this, the negative polarity waveform of the sinusoidal waveform is stepped down, and the sinusoidal waveform when the negative polarity waveform is output (i.e., the low level is output) may lower the voltage value on the repair line L. Therefore, in order to avoid this situation, the present example connects an inverting module 102 to the output end of the phase shifting module 101, and performs an inverting operation on the negative polarity waveform by the inverting module 102, so that the negative polarity waveform is amplified downward, so that the voltage value of the repair line L can be pulled up.
And the input end of the amplifying module 103 is connected with the output end of the inverting module 102, and the output end of the amplifying module 103 is connected with the repairing line L and is used for amplifying the repairing analog signal after conversion and inversion and outputting the repairing analog signal as the target repairing signal. Since there is some attenuation of the repair analog signal after passing through the phase shifting module 101, the driving force of the repair analog signal is reduced, so in order to avoid the attenuation, the present example is used for amplifying the repair analog signal by connecting the amplifying module 103 to the output end of the inverting module 102, so as to ensure the driving force thereof.
Specifically, referring to fig. 6, the phase shift module 101 includes a plurality of groups of phase shift circuits 1011 connected in series in sequence, and the phase shift circuits 1011 include a first capacitor C1 and a first resistor R1 connected in series.
Taking the single phase shift circuit 1011 as an example, the single phase shift circuit 1011 shows a single stage RC filter using a single first capacitor C1 and a single first resistor R1, the first capacitor C1 is charged according to the state of the square wave waveform, the first capacitor C1 will be charged if the square wave waveform in the input is high, and the first capacitor C1 will be discharged if the square wave waveform in the input is low.
While this example uses a three-stage phase shift circuit 1011 to phase shift the recovered analog signal. After the square wave waveform is output into a parabolic waveform through the first-stage phase shifting circuit 1011, the parabolic waveform is input into the second-stage phase shifting circuit 1011, the triangular waveform is output through the second-stage phase shifting circuit 1011 and then is taken as the input of the third-stage phase shifting circuit 1011, and the triangular waveform is changed through the third-stage phase shifting circuit 1011 to be bent and output into a sine waveform, so that the conversion from the square wave waveform to the sine waveform is completed. A waveform schematic of a specific square waveform output as a sine waveform is illustrated in fig. 7.
Further, the inverter module 102 includes an inverter control circuit 1021, where the inverter control circuit 1021 includes a first compensation switch tube Q1, a second compensation switch tube Q2, and an inverter INV;
The input end of the first compensation switch tube Q1 and the input end of the second compensation switch tube Q2 are connected to the output end of the phase shifting module 101 in a sharing way, the output end of the second compensation switch tube Q2 is connected to the input end of the inverter INV, and the output end of the inverter INV and the output end of the first compensation switch tube Q1 are connected to the input end of the amplifying module 103 in a sharing way.
In order to realize the targeted inversion of the negative polarity waveform, the inversion module 102 in this example sets different conduction channels for the positive polarity waveform and the negative polarity waveform on the sinusoidal waveform, so that the positive polarity waveform is directly output when the positive polarity waveform is connected, and the negative polarity waveform is subjected to the inversion operation when the negative polarity waveform is connected, so that the situation that the charging rate of the target repair signal at the high level is reduced due to the wrong inversion operation of the positive polarity waveform is avoided.
It should be noted that, in this example, the first compensation switch tube Q1 is a PMOS tube, the second compensation switch tube Q2 is an NMOS tube, and based on the high-level conduction characteristic of the PMOS tube, the first compensation switch tube Q can be turned on according to the control signal of the high level when the connected positive waveform is the positive waveform, and the positive waveform can be directly output; based on the characteristic of low-level conduction of the NMOS tube, the negative-polarity waveform can be conducted according to a control signal of low level when the negative-polarity waveform is connected, the negative-polarity waveform is transmitted into the inverter INV connected to the rear end of the NMOS tube, and the negative-polarity waveform is subjected to inversion operation through the inverter INV. The sinusoidal waveform output by the inverting module 102 may be exemplified by the waveform shown in fig. 8, wherein the square waveform in fig. 8 is used for comparative reference.
Further, the first compensation switch tube Q1 and the second compensation switch tube Q2 are respectively connected to the control signals, and based on the level state of the control signals, the first compensation switch tube Q1 and the second compensation switch tube Q2 respectively enter corresponding on states so as to selectively perform inverse control on the sine waveforms.
In this example, the negative polarity waveform in the sinusoidal waveform can be controlled in opposite phase, but the positive polarity waveform in the sinusoidal waveform is not controlled in opposite phase, because the control signals for controlling the first compensation switch Q1 and the second compensation switch Q2 to be turned on are synchronous with the data signal, and because the repair signal on the repair line L corresponds to the data signal, the control signals for controlling the first compensation switch Q1 and the second compensation switch Q2 to be turned on can be synchronous with the repair signal (i.e. the repair analog signal), the control signal in the high level state corresponds to the positive polarity waveform in the repair analog signal, and the control signal in the low level state corresponds to the negative polarity waveform in the repair analog signal, so that the first compensation switch Q1 and the second compensation switch Q2 can be controlled in opposite phase selectively based on the corresponding control signals, thereby realizing the increase of the charging rate of the target repair signal when the high level state is maintained, and the increase of the charging rate of the target repair signal when the target repair signal in the low level state is maintained.
The method comprises the following steps: when the control signal is in a high-level state, the first compensation switch Q1 is turned on, the second compensation switch Q2 is turned off, and the positive polarity waveform in the sinusoidal waveform is directly connected to the amplifying module 103 through the turned-on first compensation switch Q1.
When the control signal is in a low-level state, the first compensation switch Q1 is turned off, the second compensation switch Q2 is turned on, the negative polarity waveform in the sinusoidal waveform is transferred into the inverter INV for inversion through the turned-on second compensation switch Q2, and the inverted negative polarity waveform is transferred to the amplifying module 103.
Further, the amplifying module 103 includes an amplifying circuit 1031, and the amplifying circuit 1031 includes a first triode BJT;
The base electrode of the first triode BJT is connected to the connection line between the first compensation switch Q1 and the inverter INV, the collector electrode of the first triode BJT is connected to the positive signal output end (i.e. the Repair out+ in fig. 6) of the circuit compensation module 10 and the positive signal input end (i.e. the Repair in+ in fig. 6) of the circuit compensation module 10, and the emitter electrode of the first triode BJT is connected to the negative signal output end (i.e. the Repair out+ in fig. 6) of the circuit compensation module 10, wherein the Repair in-in fig. 6 is the negative signal input end of the circuit compensation module 10.
It should be noted that, the resistor connected in series on the base of the first triode BJT is used for stabilizing bias, the resistor connected in series on the collector of the first triode BJT is used for impedance matching, and the emitter of the first triode BJT is connected in series with the RC circuit 50 for providing bias voltage.
In addition, in order to avoid the distortion of the sinusoidal waveform caused by the amplifying operation of the first triode BJT, the amplifying module 103 in this example is further provided with a negative feedback circuit, that is, a lead-out connection line on the collector of the first triode BJT is connected to the positive signal input end (i.e., the pair in+) of the phase shifting module 101, so as to reduce the distortion of the sinusoidal waveform.
Specifically, the positive polarity waveform and the negative polarity waveform after the inversion are amplified by the base electrode of the first triode BJT, and then output as the target repair signal from the collector electrode of the first triode BJT, and return to the repair line L. The sine waveform output by the amplifying module 103 may be exemplified by the waveform shown in fig. 9, wherein the square waveform in fig. 9 is used for comparison reference.
Specifically, referring to fig. 10 and 11, fig. 10 is a schematic diagram of the charging rate of the Repair line L based on the Repair signal before compensation (i.e., repair in fig. 10), as can be obtained from fig. 10, the overlapping area of the voltage value of the Repair signal before compensation (i.e., V' in fig. 10) and the clock signal (i.e., CK in fig. 10) is small, i.e., the voltage value that can be reached in the charging time t is small, and the charging rate is low.
Fig. 11 is a schematic diagram of the charging rate of the Repair line L based on the compensated target Repair signal (i.e., the Repair out in fig. 11), wherein the voltage value is pulled up on the positive half-axis waveform of the positive waveform according to the positive polarity waveform of the target Repair signal, and the voltage value is reduced on the negative half-axis waveform of the positive polarity waveform, wherein the overlapping area of the voltage value (i.e., the Repair out in fig. 11) and the clock signal (i.e., the V in fig. 11) is larger than that shown in fig. 10, i.e., the voltage value that can be reached in the charging time (i.e., the V in fig. 11) is larger, so that the pulled-up charging rate increases the voltage on the pixel corresponding to the data line repaired based on the Repair line L, thereby reducing the brightness difference between the pixel and the pixel driven based on the data line in the normal state, and avoiding the problem of uneven display brightness to some extent.
To be specific, taking fig. 2 as an example, the voltage is raised and then lowered to ensure that the voltage near the near end of the point B tends to be consistent with the display brightness at the same level after charging when the line corresponding to the point B is driven, so as to avoid the problem of uneven display brightness still existing due to excessive brightness in the raised state of the voltage.
When driving the row corresponding to the a point based on the repaired data line L', there is a certain voltage drop in the voltage output to the a point because there is an RC influence from the B point to the a point.
Referring to fig. 12, fig. 12 is a flowchart of an embodiment of a method for repairing a display panel according to the present invention, where the method for repairing a display panel includes the following steps:
Step S10, transmitting a repair analog signal converted based on the flip chip film and a control signal generated by the controller into the circuit compensation module, compensating the repair analog signal according to the control signal through the circuit compensation module, and outputting a target repair signal;
and step S20, transmitting the target repair signal to the repair line, compensating the voltage value on the repair line according to the target repair signal, and pulling up the charging rate on the repair line.
The specific implementation process of step S10 to step S20 is described with reference to fig. 2, and is not repeated here.
Optionally, in step S20, the step of compensating, by the circuit compensation module, the repair analog signal according to the control signal, and outputting a target repair signal includes:
Step S201, after the square waveform of the accessed repair analog signal is converted into a sine waveform by the phase shifting module, the sine waveform is transmitted into the inverting module;
Step S202, selectively inverting the sinusoidal waveform according to the received control signal by the inverting module, outputting a positive polarity waveform in the sinusoidal waveform to the amplifying module based on the selectively inverting control, inverting a negative polarity waveform in the sinusoidal waveform, and outputting the inverted positive polarity waveform to the amplifying module;
and step 203, amplifying the accessed positive polarity waveform and the negative polarity waveform after the inversion by the amplifying module, and outputting the amplified positive polarity waveform and the inverted negative polarity waveform as the target repair signal.
The specific implementation process of step S201 to step S203 is described with reference to fig. 5, and is not repeated here.
In addition, the invention also provides a display device, which comprises the display panel and the backlight module, wherein the display panel is arranged on the light emitting side of the backlight module;
the display device further includes a memory, a processor, and a computer processing program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the repair method as described above.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method of the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (8)
1. A display panel, the display panel comprising:
the flip chip film is arranged on the non-display area of the display panel, is connected with a repair line arranged on the periphery of the display area of the display panel and is used for converting a repair digital signal on the repair line into a repair analog signal;
the circuit compensation module is arranged in the non-display area and is used for accessing the repair analog signal, compensating the repair analog signal according to the input control signal to obtain a target repair signal and transmitting the target repair signal to the repair line;
the repair line is used for compensating a voltage value according to the target repair signal so as to raise the charging rate;
Wherein, the circuit compensation module includes:
the phase shifting module is used for converting the square wave waveform of the repair analog signal and converting the square wave waveform into a sine waveform;
The input end of the inverting module is connected with the output end of the phase shifting module and is used for inverting the negative polarity waveform in the accessed sine waveform;
And the input end of the amplifying module is connected with the output end of the inverting module, and the output end of the amplifying module is connected with the repair line and is used for amplifying the repair analog signal after conversion and inversion and outputting the amplified repair analog signal as the target repair signal.
2. The display panel of claim 1, further comprising a controller coupled to the circuit compensation module for inputting the control signal to the circuit compensation module;
The output state of the control signal is determined based on a frame start pulse signal, a data mark signal and a reset signal which are output by the controller, and when the controller detects a first time sequence point on the falling edge of a target data mark signal, the controller starts to output the control signal, wherein the target data mark signal is the first data mark signal after the falling edge of the frame start pulse signal;
When the controller detects a second timing point on the falling edge of the reset signal, the controller stops outputting the control signal.
3. The display panel of claim 1, wherein the phase shift module comprises a plurality of groups of phase shift circuits connected in series in sequence, the phase shift circuits comprising a first capacitor and a first resistor connected in series;
the inverting module comprises an inverting control circuit, and the inverting control circuit comprises a first compensating switch tube, a second compensating switch tube and an inverter;
The input end of the first compensation switch tube and the input end of the second compensation switch tube are connected with the output end of the phase shifting module in a sharing way, the output end of the second compensation switch tube is connected with the input end of the phase inverter, and the output end of the phase inverter and the output end of the first compensation switch tube are connected with the input end of the amplifying module in a sharing way;
the amplifying module comprises an amplifying circuit, and the amplifying circuit comprises a first triode;
The base electrode of the first triode is connected to the connecting line of the first compensation switch tube and the inverter, the collector electrode of the first triode is connected to the positive signal output end of the circuit compensation module and the positive signal input end of the circuit compensation module respectively, and the emitter electrode of the first triode is connected to the negative signal output end of the circuit compensation module.
4. The display panel according to claim 3, wherein the first compensation switching tube and the second compensation switching tube are respectively connected to the control signal, and based on a level state of the control signal, the first compensation switching tube and the second compensation switching tube are respectively connected to corresponding on states to selectively perform inverse control on the sine waveform;
When the control signal is in a high-level state, the first compensation switching tube enters a conducting state, the second compensation switching tube enters a cut-off state, and the positive polarity waveform in the sine waveform is directly connected through the conducting first compensation switching tube and is transmitted to the amplifying module;
When the control signal is in a low-level state, the first compensation switch tube enters an off state, the second compensation switch tube enters an on state, the negative polarity waveform in the sine waveform is transmitted into the inverter for inversion through the second compensation switch tube which is conducted, and the inverted negative polarity waveform is transmitted into the amplifying module.
5. The display panel of claim 4, wherein the positive polarity waveform and the negative polarity waveform after inversion are amplified by the base of the first transistor, respectively, and output from the collector of the first transistor as the target repair signal, and return to the repair line.
6. The display panel of claim 5, wherein the repair line is configured to pull up the voltage value on a positive half-axis waveform of the positive polarity waveform and to decrease the voltage value on a negative half-axis waveform of the positive polarity waveform according to the positive polarity waveform of the target repair signal;
And pulling up the voltage value on a negative half-axis waveform of the negative polarity waveform and reducing the voltage value on a positive half-axis waveform of the negative polarity waveform according to the negative polarity waveform of the target repair signal.
7. A repair method of a display panel, wherein the repair method of the display panel is applied to the display panel according to any one of claims 1 to 6, the display panel comprises a flip chip film, a controller, a circuit compensation module and repair lines, and the repair method comprises the following steps:
transmitting a repair analog signal converted based on the flip chip film and a control signal generated by the controller into the circuit compensation module, compensating the repair analog signal according to the control signal through the circuit compensation module, and outputting a target repair signal;
transmitting the target repair signal to the repair line, compensating the voltage value on the repair line according to the target repair signal, and increasing the charging rate on the repair line;
The circuit compensation module comprises a phase shifting module, an inverting module and an amplifying module, and the step of compensating the repairing analog signal according to the control signal and outputting a target repairing signal through the circuit compensation module comprises the following steps:
the phase shifting module converts the square waveform of the accessed repair analog signal into a sine waveform, and then transmits the sine waveform into the inverting module;
the inverting module is used for carrying out selective inverting control on the sine waveform according to the received control signal, outputting a positive polarity waveform in the sine waveform to the amplifying module based on the selective inverting control, inverting a negative polarity waveform in the sine waveform and outputting the inverted positive polarity waveform to the amplifying module;
and amplifying the accessed positive polarity waveform and the negative polarity waveform after the inversion by the amplifying module, and outputting the amplified positive polarity waveform and the negative polarity waveform as the target repair signal.
8. A display device, characterized in that the display device comprises the display panel according to any one of claims 1 to 6 and a backlight module, the display panel being arranged on a light-emitting side of the backlight module;
the display device further comprises a memory, a processor, and a computer processing program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the repair method of claim 7.
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| CN114360438B (en) * | 2020-09-30 | 2022-12-16 | 荣耀终端有限公司 | Display device, driving chip and electronic equipment |
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| KR20080020877A (en) * | 2006-09-01 | 2008-03-06 | 삼성전자주식회사 | Display device |
| KR20100120819A (en) * | 2009-05-07 | 2010-11-17 | 주식회사 동부하이텍 | Source driver and liquid crystal display device |
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