Display panel

Abstract

The application discloses a display panel, which comprises a power supply interface, a controller, a bleeder circuit and a ground terminal. The bleeder circuit comprises a first end, a second end and a third end. The first end is connected with the power supply interface, the second end is connected with the controller, and the third end is connected with the ground terminal. The controller is used for delivering an enable signal to the second end. The bleeder circuit is used for conducting the power supply interface and the ground terminal according to the enable signal. When the display panel is abnormally powered off, the controller delivers the enable signal to the second end of the bleeder circuit. The bleeder circuit conducts the first end and the second end according to the enable signal, thereby conducting the power supply interface and the ground terminal of the display panel. The residual input voltage at the power supply interface can be quickly discharged through the ground terminal. The display panel provided by the application can completely cut off the backlight power supply of the display panel before the red light of KSF fluorescent powder appears, thereby eliminating the red flash phenomenon and greatly improving the visual experience of users in abnormal conditions.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display panel. Background Technology

[0002] Traditional liquid crystal displays (LCDs) rely on blue light-emitting diodes (LEDs) to excite yellow phosphors to produce white light. However, the insufficient red light wavelength limits the color gamut displayed by LCDs. Current technology typically uses KSF phosphors (chemical formula: K2SiF6:Mn). 4+ KSF phosphor's narrowband red light emission characteristics are used to expand the color gamut of the display. KSF phosphor can emit high-purity red light when excited by blue light, but due to its inherent characteristics, the red light has an 8.4ms delay. This may cause the red signal to be out of sync with other color signals, resulting in a flickering red phenomenon, which reduces the user experience. Summary of the Invention

[0003] This application provides a display panel that can improve the red flickering phenomenon.

[0004] The display panel includes a power interface, a controller, a bleed circuit, and a ground terminal. The bleed circuit includes a first terminal, a second terminal, and a third terminal. The first terminal is connected to the power interface, the second terminal is connected to the controller, and the third terminal is connected to the ground terminal. The controller is used to send an enable signal to the second terminal, and the bleed circuit is used to connect the power interface and the ground terminal according to the enable signal.

[0005] In some feasible implementations, the discharge circuit includes a first logic gate, a first field-effect transistor (FET), and a second FET. The first logic gate includes a first input terminal, a second input terminal, and a first output terminal. The power interface is electrically connected to the first input terminal and the drain of the first FET, respectively. The controller is electrically connected to the second input terminal and the source of the second FET, respectively. The first output terminal is electrically connected to the gate of the first FET. The source of the first FET is electrically connected to the drain of the second FET. The source of the second FET is connected to the ground terminal.

[0006] In some feasible implementations, the bleeder circuit includes a first comparator, which includes a third input terminal, a fourth input terminal, and a second output terminal. The third input terminal is connected to a power interface, and the fourth input terminal is connected to a controller. The controller is used to send a first voltage value to the fourth input terminal. The first comparator is used to output a first signal based on the input voltage of the power interface and the first voltage value. The bleeder circuit is used to connect the power interface and the ground terminal based on the enable signal and the first signal.

[0007] In some feasible implementations, the discharge circuit also includes a second logic gate, a third field-effect transistor, and a fourth field-effect transistor. The second logic gate includes a fifth input terminal, a sixth input terminal, and a third output terminal. The fifth input terminal is electrically connected to the controller, and the sixth input terminal is connected to the second output terminal. The fifth input terminal is used to receive an enable signal, and the sixth input terminal is used to receive a first signal. The third output terminal is connected to the gate of the third field-effect transistor and the gate of the fourth field-effect transistor, respectively. The third field-effect transistor and the fourth field-effect transistor are connected in series between the power interface and the ground terminal.

[0008] In some feasible implementations, the discharge circuit also includes a first resistor and a second resistor, with the first resistor connected in series between the fourth field-effect transistor and the ground terminal, and the second resistor connected in parallel with the fourth field-effect transistor and the first resistor.

[0009] In some feasible implementations, the bleeder circuit further includes a second comparator, which includes a seventh input terminal, an eighth input terminal, and a fourth output terminal. The seventh input terminal is connected to the power interface, and the eighth input terminal is connected to the controller. The controller is used to send a second voltage value to the eighth input terminal. The second comparator is used to output a second signal based on the input voltage of the power interface and the second voltage value. The bleeder circuit is used to turn on the power interface and the ground terminal based on the enable signal, the first signal, and the second signal.

[0010] In some feasible implementations, the discharge circuit also includes a third logic gate, a fourth logic gate, a fifth field-effect transistor, and a third resistor. The third logic gate includes a ninth input, a tenth input, and a fifth output. The fourth logic gate includes an eleventh input, a twelfth input, and a sixth output. The ninth input is connected to the controller and is used to receive an enable signal. The tenth input is connected to the second output and is used to receive a first signal. The eleventh input is connected to the fourth output and is used to receive a second signal. The twelfth input is connected to the fifth output. The sixth output is connected to the gate of the fifth field-effect transistor. The fifth field-effect transistor and the third resistor are connected in series between the power supply interface and the ground terminal.

[0011] In some feasible implementations, the discharge circuit includes a sub-controller and a field-effect transistor. The field-effect transistor is connected between the power interface and the ground terminal. The sub-controller is connected to the power interface, the controller, and the gate of the field-effect transistor. The sub-controller is used to compare the input voltage of the power interface with a first preset value, and to conduct the power interface and the ground terminal when the input voltage is greater than the first preset value.

[0012] In some feasible implementations, there are multiple field-effect transistors connected in parallel between the power interface and the ground terminal. The sub-controller is also used to compare the input voltage, a first preset value, and a second preset value, and control the number of field-effect transistors turned on according to the comparison result to turn on the power interface and the ground terminal; and / or The display panel includes multiple field-effect transistors connected in parallel between the power interface and the ground terminal. The display panel also includes a temperature sensor for detecting the temperature of the display panel. A sub-controller is connected to the temperature sensor and controls the number of field-effect transistors turned on based on the temperature of the display panel to turn on the power interface and the ground terminal.

[0013] In some feasible implementations, the display panel includes a data line, a sub-controller is connected to the data line, the data line is used to output waveforms to the sub-controller, and when the waveform output by the data line is cut off, the sub-controller is used to turn on the power interface and the ground terminal according to the enable signal.

[0014] The first terminal of the bleeder circuit is connected to the power interface of the display panel, and the second terminal is connected to the ground terminal of the display panel. When the display panel is abnormally powered off, the controller sends an enable signal to the second terminal of the bleeder circuit. The bleeder circuit then conducts both the first and second terminals according to the enable signal, thereby connecting the power interface and the ground terminal of the display panel. This allows any residual input voltage at the power interface to be quickly discharged through the ground terminal. The display panel provided in this application can completely cut off the backlight power supply of the display panel before the red light of the KSF phosphor appears, thus eliminating the red flickering phenomenon and greatly improving the user's visual experience under abnormal conditions. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0016] Figure 1 A schematic diagram of the display panel provided in this application; Figure 2 A schematic diagram of a discharge circuit is provided for this application; Figure 3 for Figure 2 The diagram shows the operating logic of the discharge circuit. Figure 4 This is a simulation waveform diagram of a display panel used in existing technology. Figure 5 For including Figure 2 The simulation waveform diagram of the display panel of the discharge circuit shown; Figure 6 A schematic diagram of another discharge circuit provided in this application; Figure 7 for Figure 6 The diagram shows the operating logic of the discharge circuit. Figure 8 For including Figure 6 The simulation waveform diagram of the display panel of the discharge circuit shown; Figure 9 A schematic diagram of another discharge circuit provided in this application; Figure 10 for Figure 9 The diagram shows the operating logic of the discharge circuit. Figure 11 A schematic diagram of the operating logic of the sub-controller provided in this application; Figures 12-15 For including Figure 9 The simulation waveform diagram of the display panel of the discharge circuit shown.

[0017] Attached image annotations: 1000 - Display panel, 100 - Power interface, 200 - Controller, 300 - Ground terminal, 400 - Discharge circuit, 401 - First terminal, 402 - Second terminal, 403 - Third terminal, 410 - First logic gate, 411 - First input terminal, 412 - Second input terminal, 413 - First output terminal, 420 - First field-effect transistor, 430 - Second field-effect transistor, 440 - First comparator, 441 - Third input terminal, 442 - Fourth input terminal, 443 - Second output terminal, 450 - Second logic gate, 451 - Fifth input terminal, 452 - Sixth input terminal, 453 - Third output terminal, 460 - Third... Field-effect transistor (FET), 470 - Fourth FET, 480 - First resistor, 481 - Second resistor, 482 - Third resistor, 490 - Second comparator, 491 - Seventh input, 492 - Eighth input, 493 - Fourth output, 500 - Third logic gate, 501 - Ninth input, 502 - Tenth input, 503 - Fifth output, 510 - Fourth logic gate, 511 - Eleventh input, 512 - Twelfth input, 513 - Sixth output, 520 - Fifth FET, 600 - Sub-controller, 610 - FET, 620 - Temperature sensor, 630 - Data line. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0019] Please see Figure 1The display panel 1000 provided in this application includes a power interface 100, a controller 200, a discharge circuit 400, and a ground terminal 300. The discharge circuit 400 includes a first terminal 401, a second terminal 402, and a third terminal 403. The first terminal 401 is connected to the power interface 100, the second terminal 402 is connected to the controller 200, and the third terminal 403 is connected to the ground terminal 300. The controller 200 is used to send an enable signal to the second terminal 402, and the discharge circuit 400 is used to turn on the power interface 100 and the ground terminal 300 according to the enable signal.

[0020] When the display panel 1000 is working normally, the discharge circuit 400 is in the off state. At this time, the power interface 100 and the ground terminal 300 of the display panel 1000 are disconnected, and the residual voltage at the power interface 100 is released normally through the circuit. When the display panel 1000 is malfunctioning, the controller 200 sends an enable signal to the discharge circuit 400. After receiving the enable signal, the discharge circuit 400 conducts the power interface 100 and the ground terminal 300, causing the residual input voltage at the power interface 100 to discharge rapidly. This enable signal can be a high-level signal or a low-level signal. For example, when the display panel 1000 flashes red after being turned off, the controller 200 sends a high-level signal to the discharge circuit 400. At this time, the discharge circuit 400 conducts the first terminal 401 and the third terminal 403 to conduct the power interface 100 and the ground terminal 300. The residual charge on the power interface 100 flows rapidly to ground through this low-impedance path, causing the residual input voltage at the power interface 100 to drop rapidly. It should be noted that the backlight driving circuit within the display panel 1000 typically has an operating voltage range; for example, it requires an input voltage greater than 3V to function. When the input voltage at the power interface 100 is rapidly pulled down below this operating threshold by the bleeder circuit 400, the driver chip will instantly shut down due to undervoltage protection, ceasing power supply to the blue LED. Because the power supply to the blue LED is instantly cut off, the KSF phosphor loses its excitation source, and its faint red light becomes almost invisible. The entire screen cleanly and crisply turns off, avoiding the flickering red phenomenon where the blue light goes out first, followed by the red light.

[0021] The display panel 1000 provided in this application uses a discharge circuit 400 to quickly discharge the residual input voltage after the power interface 100 is turned off through the ground terminal 300, so as to completely cut off the backlight power supply of the display panel 1000 before the red light of KSF phosphor appears, thereby eliminating the red flickering phenomenon and greatly improving the user's visual experience under abnormal conditions.

[0022] Please see Figure 2The discharge circuit 400 includes a first logic gate 410, a first field-effect transistor 420, and a second field-effect transistor 430. The first logic gate 410 includes a first input terminal 411, a second input terminal 412, and a first output terminal 413. The power interface 100 is electrically connected to the first input terminal 411 and the drain of the first field-effect transistor 420. The controller 200 is electrically connected to the second input terminal 412 and the source of the second field-effect transistor 430. The first output terminal 413 is electrically connected to the gate of the first field-effect transistor 420. The source of the first field-effect transistor 420 is electrically connected to the drain of the second field-effect transistor 430. The source of the second field-effect transistor 430 is connected to the ground terminal 300. The first logic gate 410 can be an AND gate, NOT gate, NAND gate, etc. The first field-effect transistor 420 and the second field-effect transistor 430 can be P-type or N-type field-effect transistors.

[0023] The first logic gate 410 detects the input voltage and enable signal at the power interface 100 in real time. When the display panel 1000 is abnormally shut down, the first logic gate 410 controls the first field-effect transistor 420 to conduct, and the enable signal output by the controller 200 controls the second field-effect transistor 430 to conduct, so as to conduct the power interface 100 and the ground terminal 300, thereby enabling the input voltage at the power interface 100 to flow to ground quickly, realizing rapid voltage discharge. Such a discharge circuit 400 has a simple structure, low cost and easy implementation. The first field-effect transistor 420 and the second field-effect transistor 430 act as a double insurance to effectively avoid the short circuit to ground of the power interface 100 under unstable circuit conditions, effectively improving the problem of the backlight flickering red of the display panel 1000.

[0024] For example, please see Figure 3The first logic gate 410 is an AND gate, and the first field-effect transistor 420 and the second field-effect transistor 430 are both P-type field-effect transistors. When the display panel 1000 is normally powered off, the residual input voltage at the power interface 100 is high, the enable signal is high, and the output of the first logic gate 410 is high. At this time, both the first field-effect transistor 420 and the second field-effect transistor 430 are turned off. In this state, the first field-effect transistor 420 and the second field-effect transistor 430 act as a double safety device between the power interface 100 and the ground terminal 300, ensuring that the power interface 100 and the ground terminal 300 are disconnected. When the display panel 1000 is abnormally powered off, the residual input voltage at the power interface 100 is high, the enable signal turns low, and the second field-effect transistor 430 turns on. At the same time, the output of the first logic gate 410 becomes low, and the first field-effect transistor 420 also turns on. When both the first field-effect transistor 420 and the second field-effect transistor 430 are turned on, the power interface 100 and the ground terminal 300 are connected, enabling rapid discharge of residual voltage at the power interface 100. Please refer to [link / reference]. Figure 4 and Figure 5 , Figure 4 This is a simulation waveform diagram of the display panel 1000 used in existing technology. Figure 5 For including Figure 2 The simulation waveform diagram of the display panel 1000 of the discharge circuit 400 shown can be verified by experiments. It can be seen that the display panel 1000 provided in this application can quickly discharge the residual input voltage at the power interface 100.

[0025] In some feasible implementations, the discharge circuit 400 provided in this application can also determine the magnitude of the discharge current by comparing the input voltage with different voltage values, and control the conduction of field-effect transistors in different branches accordingly, so as to change the discharge speed of the voltage at the power interface 100. The following is a detailed description of the structure of the discharge circuit 400.

[0026] Please see Figure 6The discharge circuit 400 includes a first comparator 440, which has a third input terminal 441, a fourth input terminal 442, and a second output terminal 443. The third input terminal 441 is connected to the power interface 100, and the fourth input terminal 442 is connected to the controller 200. The controller 200 is used to supply a first voltage value to the fourth input terminal 442. The first comparator 440 is used to output a first signal based on the input voltage of the power interface 100 and the first voltage value. The discharge circuit 400 is used to turn on the power interface 100 and the ground terminal 300 based on the enable signal and the first signal. The first voltage value is the turn-off voltage of the power integrated circuit. When the input voltage at the power interface 100 is higher than the first voltage value, it indicates that the residual voltage at the power interface 100 is large, and a large discharge current is required to quickly discharge the residual voltage. When the input voltage at the power interface 100 is lower than the first voltage value, the power integrated circuit stops working.

[0027] For example, the first comparator 440 can be an operational amplifier, the third input terminal 441 is the non-inverting input terminal of the first comparator 440, and the third input terminal 441 is used to receive the input voltage at the power interface 100 in real time, and the fourth input terminal 442 is the inverting input terminal of the first comparator 440, and the fourth input terminal 442 is used to receive the first voltage value. When the input voltage at the power interface 100 is greater than the first voltage value, the first signal output by the first comparator 440 is a high-level signal; when the input voltage at the power interface 100 is less than the first voltage value, the first signal output by the first comparator 440 is a low-level signal. If the enable signal corresponding to the abnormal shutdown state of the display panel 1000 is a low-level signal, then when the first signal output by the first comparator 440 is a high-level signal and the enable signal is a low-level signal, the discharge circuit 400 turns on the field-effect transistor on the high-current branch to turn on the power interface 100 and the ground terminal 300, thereby making the voltage at the power interface 100 discharge more quickly, reliably solving the flashing red problem under the abnormal shutdown state of the display panel 1000, and significantly improving the stability and safety of the entire system.

[0028] Please see Figure 6Specifically, the discharge circuit 400 also includes a second logic gate 450, a third field-effect transistor 460, and a fourth field-effect transistor 470. The second logic gate 450 includes a fifth input terminal 451, a sixth input terminal 452, and a third output terminal 453. The fifth input terminal 451 is electrically connected to the controller 200, and the sixth input terminal 452 is connected to the second output terminal 453. The fifth input terminal 451 is used to receive an enable signal, and the sixth input terminal 452 is used to receive a first signal. The third output terminal 453 is connected to the gate of the third field-effect transistor 460 and the gate of the fourth field-effect transistor 470, respectively. The third field-effect transistor 460 and the fourth field-effect transistor 470 are connected in series between the power interface 100 and the ground terminal 300. When the first signal output by the first comparator 440 is a high-level signal and the enable signal is a low-level signal, the signal output by the second logic gate 450 turns on the third field-effect transistor 460 and the fourth field-effect transistor 470, thereby turning on the power interface 100 and the ground terminal 300.

[0029] For example, the second logic gate 450 is an AND gate, and the third field-effect transistor 460 and the fourth field-effect transistor 470 are N-type field-effect transistors. The enable signal output by the controller 200 is sent to the fifth input terminal 451 of the second logic gate 450 after passing through an NOT gate. The first signal output by the first comparator 440 is sent to the sixth input terminal 452 of the second logic gate 450. When the display panel 1000 is normally powered off, the enable signal is high, the input voltage is greater than the first voltage value, and the second logic gate 450 outputs a low-level signal. At this time, the third field-effect transistor 460 and the fourth field-effect transistor 470 are both cut off, and the power interface 100 and the ground terminal 300 are disconnected. When the display panel 1000 is abnormally powered off, the enable signal is low, the input voltage value is greater than the first voltage value, and the second logic gate 450 outputs a high-level signal. At this time, the third field-effect transistor 460 and the fourth field-effect transistor 470 are both turned on, so that the power interface 100 and the ground terminal 300 are connected.

[0030] Please see Figure 6The discharge circuit 400 also includes a first resistor 480 and a second resistor 481. The first resistor 480 is connected in series between the fourth field-effect transistor 470 and the ground terminal 300. The second resistor 481 is connected in parallel with the fourth field-effect transistor 470 and the first resistor 480. The series connection of the third field-effect transistor 460, the fourth field-effect transistor 470, and the first resistor 480, along with the second resistor 481 connected in parallel with the fourth field-effect transistor 470 and the first resistor 480, forms a branch that allows a large discharge current to pass through, i.e., a high-current branch. The circuit containing the second resistor 481 is a shunt circuit. When both the third field-effect transistor 460 and the fourth field-effect transistor 470 are turned on, the input voltage discharge path is divided into two paths: one is discharged to ground through the third field-effect transistor 460, the fourth field-effect transistor 470, and the first resistor 480, and the other is discharged to ground through the third field-effect transistor 460 and the second resistor 481. The magnitude of the current shunt in the shunt circuit is determined by the resistance value of the second resistor 481. It should be noted that both the first resistor 480 and the second resistor 481 are low-resistance resistors, but the second resistor 481 is slightly larger than the first resistor 480 to prevent the current in the display panel 1000 from discharging too quickly and causing the display panel 1000 to malfunction. This high-current branch allows the remaining charge at the power interface 100 to decrease as quickly as possible, effectively solving the flickering red problem.

[0031] Please see Figure 6 The bleeder circuit 400 also includes a second comparator 490, which includes a seventh input terminal 491, an eighth input terminal 492, and a fourth output terminal 493. The seventh input terminal 491 is connected to the power interface 100, and the eighth input terminal 492 is connected to the controller 200. The controller 200 is used to supply a second voltage value to the eighth input terminal 492. The second comparator 490 is used to output a second signal based on the input voltage and the second voltage value of the power interface 100. The bleeder circuit 400 is used to connect the power interface 100 and the ground terminal 300 based on the enable signal, the first signal, and the second signal. The second voltage value is the cutoff voltage of the bleeder circuit 400. The turn-off voltage of the power integrated circuit is greater than the cutoff voltage of the bleeder circuit 400, that is, the first voltage value is greater than the second voltage value. When the input voltage is less than the first voltage value and greater than the second voltage value, the power integrated circuit is in a turned-off state. The main power consumption units such as the backlight in the display panel 1000 are turned off, and a large discharge current is no longer needed. A small discharge current can be used to gradually reduce the residual voltage at the power interface 100.

[0032] For example, the second comparator 490 can be an operational amplifier, with the seventh input terminal 491 being a non-inverting input terminal used to receive the input voltage at the power interface 100 in real time. The eighth input terminal 492 is an inverting input terminal used to receive the second voltage value. When the input voltage is less than the first voltage value and greater than the second voltage value, the first signal is low and the second signal is high; when the input voltage is greater than the second voltage value, the second signal is low. If the enable signal of the display panel 1000 in an abnormal shutdown state is low, then when the enable signal is low, the first signal is low, and the second signal is high, the bleeder circuit 400 turns off the field-effect transistor on the high-current branch and turns on the field-effect transistor on the low-current branch, so that the power interface 100 and the ground terminal 300 are connected, thereby smoothly discharging the less residual voltage at the power interface 100, improving the system stability and reducing electromagnetic interference.

[0033] Please see Figure 6 Specifically, the discharge circuit 400 also includes a third logic gate 500, a fourth logic gate 510, a fifth field-effect transistor 520, and a third resistor 482. The third logic gate 500 includes a ninth input terminal 501, a tenth input terminal 502, and a fifth output terminal 503. The fourth logic gate 510 includes an eleventh input terminal 511, a twelfth input terminal 512, and a sixth output terminal 513. The ninth input terminal 501 is connected to the controller 200 and is used to receive an enable signal. The tenth input terminal 502 is connected to the second output terminal 443 and is used to receive a first signal. The eleventh input terminal 511 is connected to the fourth output terminal 493 and is used to receive a second signal. The twelfth input terminal 512 is connected to the fifth output terminal 503. The sixth output terminal 513 is connected to the gate of the fifth field-effect transistor 520. The fifth field-effect transistor 520 is connected in series between the power interface 100 and the ground terminal 300. The branch containing the fifth field-effect transistor 520 and the third resistor 482 is a low-current branch. It should be noted that the resistance of the third resistor 482 is greater than that of the first resistor 480 and the second resistor 481. When the input voltage is greater than the second voltage value but less than the first voltage value, the fifth field-effect transistor 520 is turned on to connect the power interface 100 and the ground terminal 300, thereby causing the small amount of residual voltage at the power interface 100 to drop slowly.

[0034] For example, the third logic gate 500 is an AND gate, the fourth logic gate 510 is an AND gate, the fifth field-effect transistor 520 is an N-type field-effect transistor, the enable signal output by the controller 200 is sent to the ninth input terminal 501 of the third logic gate 500 after passing through an NOT gate, and the first signal output by the first comparator 440 is sent to the tenth input terminal 502 of the third logic gate 500 after passing through an NOT gate.

[0035] When the display panel 1000 is working normally, the input voltage is greater than the first voltage value and the second voltage value. The first signal and the second signal are both at a high level, and the enable signal is at a high level. At this time, the third logic gate 500 outputs a low level signal, the fourth logic gate 510 outputs a low level signal, the fifth field-effect transistor 520 is cut off, and the power interface 100 and the ground terminal 300 are disconnected.

[0036] When the display panel 1000 malfunctions and the input voltage is less than the first voltage value but greater than the second voltage value, the first signal is low, the second signal is high, the enable signal is low, the third logic gate 500 outputs a high-level signal, the fourth logic gate 510 outputs a high-level signal, the fifth field-effect transistor 520 is turned on, and the power interface 100 and the ground terminal 300 are connected.

[0037] When the input voltage is less than the second voltage value, the first signal is low, the second signal is low, the enable signal is low, the third logic gate 500 outputs a high-level signal, the fourth logic gate 510 outputs a low-level signal, the fifth field-effect transistor 520 is cut off, and the power interface 100 and the ground terminal 300 return to the disconnected state.

[0038] Please see Figure 7 When the input voltage is less than the second voltage value, i.e., less than the cutoff voltage of the bleeder circuit 400, the third field-effect transistor 460, the fourth field-effect transistor 470, and the fifth field-effect transistor 520 are all turned off, and the trace voltage remaining at the power interface 100 stops discharging and is naturally dissipated through the circuit. Please refer to [link to relevant documentation]. Figure 8 Experimental verification shows that when the display panel 1000 is in an abnormal shutdown state, the discharge circuit 400 can rapidly discharge the input voltage with a large discharge current when the input voltage is greater than the first voltage value. When the input voltage drops to between the first and second voltage values, it can slowly discharge with a smaller discharge current. When the input voltage drops below the second voltage value, the discharge circuit 400 shuts down, and the trace amount of input voltage remaining at the power interface 100 is naturally dissipated. By discharging the residual input voltage at the power interface 100 in a tiered manner, the abnormality of the display panel 1000 caused by excessively rapid input voltage discharge is effectively avoided. The discharge speed of the input voltage is significantly greater than the normal power-off speed, effectively improving the backlight flickering red problem of the display panel 1000.

[0039] This application also provides another discharge circuit 400, which can directly send a signal to the gate of the field-effect transistor through the sub-controller 600 to turn on the field-effect transistor, thereby turning on the power interface 100 and the ground terminal 300. The following is a detailed description of the structure of the discharge circuit 400 including the sub-controller 600.

[0040] Please see Figure 9 and Figure 10 The discharge circuit 400 includes a sub-controller 600 and a field-effect transistor (FET). The FET is connected between the power interface 100 and the ground terminal 300. The sub-controller 600 is connected to the power interface 100, the controller 200, and the gate of the FET 610. The sub-controller 600 compares the input voltage of the power interface 100 with a first preset value, and conducts the power interface 100 and the ground terminal 300 when the input voltage is greater than the first preset value. The sub-controller 600 can be a microcontroller or a single-chip microcomputer, and the first preset value is set by the user. When the display panel 1000 is working or normally powered off, the sub-controller 600 is in standby mode. When the display panel 1000 is abnormally powered off, the sub-controller 600 switches to working mode. When the sub-controller 600 is in working state, it continuously detects the input voltage of the power interface 100 and compares the detected input voltage with a first preset value. Based on the comparison result, it outputs a control signal and outputs the control signal to the gate of the field-effect transistor 610 to turn on the field-effect transistor 610, thereby turning on the power interface 100 and the ground terminal 300.

[0041] For example, when the display panel 1000 is abnormally powered off, the enable signal is low, and the sub-controller 600 switches to the working state. The field-effect transistor 610 is an N-type field-effect transistor. When the input voltage is greater than a first preset value, the sub-controller 600 outputs a high-level signal to the gate of the N-type field-effect transistor to turn it on, thereby turning on the power interface 100 and the ground terminal 300, so that the input voltage can be quickly discharged.

[0042] Please see Figure 9 The field-effect transistor 610 has multiple transistors, which are connected in parallel between the power interface 100 and the ground terminal 300. The sub-controller 600 is also used to compare the input voltage, the first preset value and the second preset value, and control the number of field-effect transistors 610 that are turned on according to the comparison result to turn on the power interface 100 and the ground terminal 300.

[0043] For example, please see Figure 11 When the display panel 1000 is working normally or powered off, the enable signal is high, and the sub-controller 600 is in standby mode. When the display panel 1000 is malfunctioning, the enable signal is low, and the sub-controller 600 is in working mode.

[0044] When the first preset value is greater than the second preset value, and the display panel 1000 is in an abnormal shutdown state while the input voltage is greater than the first preset value, the input voltage starts to drop from the normal operating voltage but remains at a relatively high level. The sub-controller 600 turns on all or most of the field-effect transistors 610 to quickly discharge the high input voltage. Since multiple field-effect transistors 610 are connected in parallel, their total on-resistance is very small, forming an extremely low impedance path. At this time, a large discharge current is generated to achieve rapid discharge.

[0045] After rapid discharge, the input voltage drops to between the first and second preset values. At this point, the discharge rate of the input voltage can be slowed down. The sub-controller 600 turns off some of the field-effect transistors 610, turning on only a small number of them. The reduced number of turned-on transistors 610 increases the total on-resistance, significantly reducing the discharge current, and the circuit enters a low-current slow-discharge phase. Please refer to [link / reference]. Figure 12 and Figure 13 During this stage, the input voltage decreases relatively quickly.

[0046] When the input voltage drops below the second preset value, it is determined that the input voltage does not need to be discharged through ground. At this time, the sub-controller 600 can turn off all field-effect transistors 610, and the discharge circuit 400 completely stops working, preventing unnecessary discharge of the already near-zero voltage and avoiding a small waste of energy. Please refer to [link to relevant documentation]. Figure 14 and Figure 15 During this stage, the rate of decrease in input voltage slows down.

[0047] The sub-controller 600 compares the input voltage with a first preset value and a second preset value, and performs graded discharge of the input voltage based on the comparison result. It provides the maximum discharge current in the initial stage when speed is most needed, quickly eliminating the flashover phenomenon. After the voltage decreases, it switches to a low-current mode, avoiding instability or component stress problems that might be caused by continuous high-current surges. Compared to simple on / off control, this graded control is smoother and more intelligent, reducing the impact on the power network and improving system stability.

[0048] Please see Figure 9The display panel 1000 also includes a temperature sensor 620, which detects the temperature of the display panel 1000. A sub-controller 600 is connected to the temperature sensor 620 and controls the number of field-effect transistors 610 that are turned on based on the temperature of the display panel 1000 to enable the power interface 100 and the ground terminal 300. The temperature sensor 620 can be a negative temperature coefficient thermistor (NTC). When the display panel 1000 operates within its normal temperature range, the sub-controller 600 allows a sufficient number of field-effect transistors 610 to be turned on to quickly discharge residual input voltage at the power interface 100. When the temperature of the display panel 1000 is too high, the sub-controller 600 activates a protection mechanism to limit the number of field-effect transistors 610 that are turned on. Through automatic thermal management, the overheating and burnout of the field-effect transistors 610 are prevented, and other temperature-sensitive components in the vicinity are also protected, thereby greatly extending the lifespan and reliability of the entire display panel 1000.

[0049] Please see Figures 9 to 15 The display panel 1000 includes a data line 630, and a sub-controller 600 is connected to the data line 630. The data line 630 is used to output waveforms to the sub-controller 600. When the waveform output by the data line 630 is cut off, the sub-controller 600 is used to turn on the power interface 100 and the ground terminal 300 according to the enable signal. When the display panel 1000 is working normally, high-frequency, periodic data waveforms are continuously transmitted on the data line 630. When the display panel 1000 is abnormally shut down, the waveform output by the data line 630 will immediately stop. When the sub-controller 600 detects that the waveform output by the data line 630 is cut off, it can further determine that the display panel 1000 is in an abnormal shutdown state. When both conditions are met simultaneously—the waveform output by the data line 630 is cut off and the enable signal is low—the sub-controller 600 will switch to the working state and output a drive signal to turn on the field-effect transistor 610 between the power interface 100 and the ground terminal 300, so that the residual input voltage at the power interface 100 can begin to discharge. By requiring both the enable signal to go low and the waveform output from data line 630 to be cut off simultaneously before the input voltage can be discharged, false discharge caused by interference from a single signal is eliminated, ensuring that the display panel 1000 is not interfered with during normal operation.

[0050] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0051] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0054] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display panel, characterized in that, The display panel includes a power interface, a controller, a discharge circuit, and a ground terminal. The discharge circuit includes a first terminal, a second terminal, and a third terminal. The first terminal is connected to the power interface, the second terminal is connected to the controller, and the third terminal is connected to the ground terminal. The controller is used to send an enable signal to the second terminal, and the discharge circuit is used to connect the power interface and the ground terminal according to the enable signal. The discharge circuit includes a first logic gate, a first field-effect transistor (FET), and a second FET. The first logic gate includes a first input terminal, a second input terminal, and a first output terminal. The power interface is electrically connected to the first input terminal and the drain of the first FET. The controller is electrically connected to the second input terminal and the source of the second FET. The first output terminal is electrically connected to the gate of the first FET. The source of the first FET is electrically connected to the drain of the second FET. The source of the second FET is connected to the ground terminal.

2. A display panel, characterized in that, The display panel includes a power interface, a controller, a discharge circuit, and a ground terminal. The discharge circuit includes a first terminal, a second terminal, and a third terminal. The first terminal is connected to the power interface, the second terminal is connected to the controller, and the third terminal is connected to the ground terminal. The controller is used to send an enable signal to the second terminal, and the discharge circuit is used to connect the power interface and the ground terminal according to the enable signal. The discharge circuit includes a first comparator, which includes a third input terminal, a fourth input terminal, and a second output terminal. The third input terminal is connected to the power interface, and the fourth input terminal is connected to the controller. The controller is used to send a first voltage value to the fourth input terminal, and the first comparator is used to connect the power interface input voltage and the ground terminal output voltage. The first voltage value outputs a first signal. The bleeder circuit is used to connect the power interface and the ground terminal according to the enable signal and the first signal. The bleeder circuit also includes a second logic gate, a third field-effect transistor, and a fourth field-effect transistor. The second logic gate includes a fifth input terminal, a sixth input terminal, and a third output terminal. The fifth input terminal is electrically connected to the controller, and the sixth input terminal is connected to the second output terminal. The fifth input terminal is used to receive the enable signal, and the sixth input terminal is used to receive the first signal. The third output terminal is connected to the gate of the third field-effect transistor and the gate of the fourth field-effect transistor, respectively. The third field-effect transistor and the fourth field-effect transistor are connected in series between the power interface and the ground terminal.

3. The display panel as described in claim 2, characterized in that, The discharge circuit further includes a first resistor and a second resistor. The first resistor is connected in series between the fourth field-effect transistor and the ground terminal, and the second resistor is connected in parallel with the fourth field-effect transistor and the first resistor.

4. The display panel as described in claim 2, characterized in that, The bleeder circuit further includes a second comparator, which includes a seventh input terminal, an eighth input terminal, and a fourth output terminal. The seventh input terminal is connected to the power interface, and the eighth input terminal is connected to the controller. The controller is used to send a second voltage value to the eighth input terminal. The second comparator is used to output a second signal based on the input voltage of the power interface and the second voltage value. The bleeder circuit is used to turn on the power interface and the ground terminal based on the enable signal, the first signal, and the second signal.

5. The display panel as described in claim 4, characterized in that, The discharge circuit further includes a third logic gate, a fourth logic gate, a fifth field-effect transistor, and a third resistor. The third logic gate includes a ninth input, a tenth input, and a fifth output. The fourth logic gate includes an eleventh input, a twelfth input, and a sixth output. The ninth input is connected to the controller and is used to receive the enable signal. The tenth input is connected to the second output and is used to receive the first signal. The eleventh input is connected to the fourth output and is used to receive the second signal. The twelfth input is connected to the fifth output. The sixth output is connected to the gate of the fifth field-effect transistor. The fifth field-effect transistor and the third resistor are connected in series between the power interface and the ground terminal.

6. A display panel, characterized in that, The display panel includes a power interface, a controller, a discharge circuit, and a ground terminal. The discharge circuit includes a first terminal, a second terminal, and a third terminal. The first terminal is connected to the power interface, the second terminal is connected to the controller, and the third terminal is connected to the ground terminal. The controller is used to send an enable signal to the second terminal, and the discharge circuit is used to conduct the power interface and the ground terminal according to the enable signal. The discharge circuit includes a sub-controller and a field-effect transistor (FET). The FET is connected between the power interface and the ground terminal. The sub-controller is connected to the power interface, the controller, and the gate of the FET. The sub-controller is used to compare the input voltage of the power interface with a first preset value, and conduct the power interface and the ground terminal when the input voltage is greater than the first preset value. Multiple FETs are connected in parallel between the power interface and the ground terminal. The sub-controller is also used to compare the input voltage with the first preset value and a second preset value, and control the number of FETs that are turned on according to the comparison result to conduct the power interface and the ground terminal; and / or The field-effect transistors are multiple, and the multiple field-effect transistors are connected in parallel between the power interface and the ground terminal. The display panel also includes a temperature sensor for detecting the temperature of the display panel. The sub-controller is connected to the temperature sensor and is used to control the number of field-effect transistors turned on according to the temperature of the display panel to turn on the power interface and the ground terminal.

7. The display panel as claimed in claim 6, characterized in that the display panel includes a data line, the sub-controller is connected to the data line, the data line is used to output a waveform to the sub-controller, and when the waveform output by the data line is cut off, the sub-controller is used to turn on the power interface and the ground terminal according to the enable signal.

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