Control circuit and control method of display panel, and display device

Abstract

The application discloses a display panel control circuit and control method, and a display device. The display panel control circuit comprises a first detection sub-circuit, a second detection sub-circuit, and a common voltage detection sub-circuit. The first detection sub-circuit is used for detecting a first voltage value of a first voltage signal end and generating a first control signal based on a detection result. The second detection sub-circuit is used for detecting a second voltage value of a second voltage signal end and generating a second control signal based on a detection result. The common voltage detection sub-circuit is used for detecting a common voltage value of a common voltage signal end based on the first voltage value of the first voltage signal end and the second voltage value of the second voltage signal end and generating a third control signal based on a detection result. The first switching sub-circuit is used for controlling the output of a switching voltage based on the first control signal, the second control signal, and the third control signal.

Description

Technical Field

[0001] This application generally relates to the field of display technology, and specifically to a control circuit and control method for a display panel, and a display device. Background Technology

[0002] TFT-LCD (Thin Film Transistor Liquid Crystal Display) is increasingly being used in high-performance display fields due to its small size, low power consumption, no radiation, and relatively low manufacturing cost.

[0003] In existing technologies, due to factors such as the arrangement of connectors and COF (chip flip-flop) traces on the display device, foreign objects during the production process, or ESD during the assembly of the entire device, the voltage amplitude of the GMA (gamma-band voltage) and VCOM (common voltage) signals changes when they are short-circuited with their side traces. This can lead to abnormalities in the display image when the panel is illuminated, including full-screen whitening, full-screen blacking, uneven gradients, and noise in some grayscale levels. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a control circuit and control method for a display panel, and a display device, which can improve the panel protection effect and prevent display malfunctions.

[0005] In a first aspect, this application provides a control circuit for a display panel, comprising:

[0006] The first detection sub-circuit is used to detect the first voltage value of the first voltage signal terminal and generate a first control signal based on the detection result.

[0007] The second detection sub-circuit is used to detect the second voltage value at the second voltage signal terminal and generate a second control signal based on the detection result.

[0008] A common voltage detection sub-circuit is used to detect the common voltage value of the common voltage signal terminal based on the first voltage value of the first voltage signal terminal and the second voltage value of the second voltage signal terminal, and to generate a third control signal based on the detection result;

[0009] The first switching sub-circuit is used to control the output of the switching voltage based on the first control signal, the second control signal, and the third control signal.

[0010] Optionally, the first voltage value is a positive voltage, the first detection sub-circuit includes a first comparator, the positive input terminal of the first comparator is electrically connected to the first voltage signal terminal, the negative input terminal of the first comparator is electrically connected to the first comparison voltage terminal, the output terminal of the first comparator is electrically connected to the first switch sub-circuit, the power supply terminal of the first comparator is electrically connected to the power supply signal terminal, and the ground terminal of the first comparator is grounded.

[0011] Optionally, the second voltage value is a negative voltage, the second detection sub-circuit includes a second comparator, the negative input terminal of the second comparator is electrically connected to the second voltage signal terminal, the positive input terminal of the second comparator is electrically connected to the second comparison voltage terminal, the output terminal of the second comparator is electrically connected to the first switch sub-circuit, the power supply terminal of the second comparator is electrically connected to the power supply signal terminal, and the ground terminal of the second comparator is grounded.

[0012] Optionally, the common voltage detection sub-circuit includes a third comparator, the positive input terminal of the third comparator being electrically connected to the common voltage signal terminal, the negative input terminal of the third comparator being electrically connected to the first voltage signal terminal, the output terminal of the third comparator being electrically connected to the first switching sub-circuit, the power supply terminal of the third comparator being electrically connected to the power supply signal terminal, and the ground terminal of the third comparator being grounded.

[0013] Optionally, the common voltage detection sub-circuit includes a fourth comparator, the positive input terminal of the fourth comparator being electrically connected to the second voltage signal terminal, the negative input terminal of the fourth comparator being electrically connected to the common voltage signal terminal, the output terminal of the fourth comparator being electrically connected to the first switch sub-circuit, the power supply terminal of the fourth comparator being electrically connected to the power supply signal terminal, and the ground terminal of the fourth comparator being grounded.

[0014] Optionally, the first switching sub-circuit includes a switching transistor, and the control terminal of the switching transistor is electrically connected to the output terminal of the first comparator, the output terminal of the second comparator, the output terminal of the third comparator, and the output terminal of the fourth comparator.

[0015] The first terminal of the switching transistor is electrically connected to the switching voltage terminal, and the second terminal of the switching transistor is grounded.

[0016] Optionally, the output terminal of the first comparator is electrically connected to the control terminal of the switching transistor via a first diode; the output terminal of the second comparator is electrically connected to the control terminal of the switching transistor via a second diode; the output terminal of the third comparator is electrically connected to the control terminal of the switching transistor via a third diode; and the output terminal of the fourth comparator is electrically connected to the control terminal of the switching transistor via a fourth diode.

[0017] Optionally, it further includes a timing controller and a drive controller, wherein the timing controller and the drive controller are electrically connected through a second switching sub-circuit, and the second switching sub-circuit is used to control the conduction and disconnection between the timing controller and the drive controller based on the switching voltage provided by the switching voltage terminal.

[0018] Secondly, this application provides a method for controlling a display panel, employing a control circuit for a display panel as described in any of the above descriptions, the method comprising:

[0019] The first detection sub-circuit detects the first voltage value at the first voltage signal terminal and generates a first control signal based on the detection result;

[0020] The second detection sub-circuit detects the second voltage value at the second voltage signal terminal and generates a second control signal based on the detection result;

[0021] The common voltage detection sub-circuit detects the common voltage value of the common voltage signal terminal based on the first voltage value of the first voltage signal terminal and the second voltage value of the second voltage signal terminal, and generates a third control signal based on the detection result;

[0022] The first switching sub-circuit controls the output of the switching voltage based on the first control signal, the second control signal, and the third control signal.

[0023] Thirdly, this application provides a display device including a control circuit for a display panel as described in any of the above.

[0024] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0025] The display panel control circuit provided in this application embodiment can detect positive polarity signals, negative polarity signals, and common voltage signals. When an abnormal signal occurs, it can judge the abnormal signal. When a signal that causes display abnormality occurs, it controls the first switch sub-circuit to perform display panel protection, which can improve the panel protection effect and prevent display failure. This application can also effectively avoid problems such as white light when the lamp is lit and abnormal screen shaking caused by abnormal VCOM voltage. Attached Figure Description

[0026] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 A schematic diagram of the structure of a control circuit for a display panel provided in an embodiment of this application;

[0028] Figure 2A schematic diagram of the connection of a control circuit for a display panel provided for an embodiment of this application;

[0029] Figure 3 A schematic diagram of the connection of a control circuit for a display panel provided for an embodiment of this application;

[0030] Figure 4 A schematic diagram illustrating the principle of a display panel control method provided in an embodiment of this application;

[0031] Figure 5 A waveform diagram of the first control signal output of a first detection sub-circuit provided for an embodiment of this application;

[0032] Figure 6 This is a waveform diagram of the third control signal output of a common voltage detection sub-circuit provided for an embodiment of this application. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Please see details. Figure 1 This application provides a control circuit for a display panel, comprising:

[0036] The first detection sub-circuit 100 is used to detect the first voltage value of the first voltage signal terminal VG1 and generate a first control signal based on the detection result.

[0037] The second detection sub-circuit 200 is used to detect the second voltage value of the second voltage signal terminal VG2 and generate a second control signal based on the detection result.

[0038] A common voltage detection sub-circuit 300 is used to detect the common voltage value of the common voltage signal terminal VCOM based on the first voltage value of the first voltage signal terminal VG1 and the second voltage value of the second voltage signal terminal VG2, and generate a third control signal based on the detection result.

[0039] The first switch sub-circuit 400 is used to control the output of the switch voltage LK based on the first control signal, the second control signal, and the third control signal.

[0040] The type of display panel is not limited in this application embodiment. The display panel can be a liquid crystal display panel (LCD), an organic light-emitting diode (OLED) display panel, an electronic paper display panel (E-paper), etc. An LCD panel is used as an example here, and other types of panels are analogous.

[0041] The TFT-LCD driving circuit may include a power management chip, a timing control circuit (TCON), a grayscale circuit, a source driver IC, and a gate driver IC. The control circuit provided in the embodiments of this application is applied to different driving circuits, and this application is not limited thereto.

[0042] It should be noted that the signal types of the first voltage signal terminal VG1 and the second voltage signal terminal VG2 are not limited in this embodiment. The first voltage signal terminal VG1 and the second voltage signal terminal VG2 can both be binding point voltage, data voltage, etc., and can be set according to the application scenario in different embodiments.

[0043] For example, the source driver further includes a gamma binding point voltage generation circuit and a data voltage generation circuit. The gamma binding point voltage generation circuit is used to generate multiple gamma binding point voltages. The data voltage generation circuit is electrically connected to the gamma binding point voltage generation circuit and is used to obtain a data voltage corresponding to a predetermined gray level based on the gamma binding point voltages, and to provide the data voltage to the data voltage providing display panel.

[0044] The control circuit provided in this embodiment can be electrically connected to the gamma binding point voltage generation circuit for voltage detection of the gamma binding point voltage generated by the gamma binding point voltage generation circuit, and can also be electrically connected to the data voltage generation circuit for voltage detection of the data voltage generated by the data voltage generation circuit.

[0045] It should also be noted that the number of the first detection sub-circuit 100 and the second detection sub-circuit 200 is not limited in this embodiment, and can be adjusted in different embodiments according to the number of signal lines to be detected.

[0046] To improve the display effect of the display panel, it is required that the driving voltages of adjacent pixels maintain opposite polarities. The driving methods that can achieve opposite polarities of adjacent pixels mainly include point inversion, 2H1V inversion, 1H2V inversion, column inversion, and row inversion. This application does not limit this, and adjustments can be made as needed in different embodiments.

[0047] For example, in the row inversion driving mode, in the current frame, the polarity of the data voltage in the nth row and mth column corresponding to the pixel circuit in the nth row and mth column is different from that in the (n+1)th row and mth column corresponding to the pixel circuit in the (n+1)th row and mth column.

[0048] In this embodiment of the invention, the polarity of the data voltage can be positive or negative. When the data voltage is positive, the voltage difference between the positive data voltage and the common electrode voltage Vcom is greater than 0, that is, the positive data voltage is greater than the common electrode voltage Vcom. When the data voltage is negative, the voltage difference between the negative data voltage and the common electrode voltage Vcom is less than 0, that is, the negative data voltage is less than the common electrode voltage Vcom.

[0049] It should also be noted that the reference voltage values ​​of the first comparison voltage terminal Vref1 and the second comparison voltage terminal Vref2 are not limited in this embodiment. They can be adjusted as needed in different embodiments. In different embodiments, the reference voltages of the first comparison voltage terminal Vref1 and the second comparison voltage terminal Vref2 can be provided by adding separate signal lines. In this embodiment, the first comparison voltage terminal Vref1 and the second comparison voltage terminal Vref2 can also be set from the same source as the first voltage signal terminal VG1 and the second voltage signal terminal VG2.

[0050] For example, the gamma-tether voltage generation circuit generates multiple gamma-tether voltages, including signals GMA1, GMA2, GMA6, GMA7, GMA8, GMA9, GMA13, and GMA14. GMA1 and GMA2 are both positive. Due to the wiring arrangement, GMA7 is susceptible to interference from other signals, while GMA6 is relatively stable and less prone to interference. The first voltage signal terminal VG1 can be the GMA7 signal, and the first comparison voltage terminal Vref1 can be the GMA6 signal. The second voltage signal terminal VG2 can be the GMA8 signal, and the second comparison voltage terminal Vref2 can be the GMA9 signal.

[0051] In other embodiments, the first comparison voltage terminal Vref1 and the second comparison voltage terminal Vref2 can also be constant voltage signals, such as the HAVDD signal. This allows the HAVDD voltage to be output directly when the positive GMA voltage is lower than HAVDD, and the HAVDD voltage to be output when the negative GMA voltage is higher than HAVDD. This application does not limit this.

[0052] In this embodiment, the voltage of the first voltage signal terminal VG1 is positive and the voltage of the second voltage signal terminal VG2 is negative, as an example.

[0053] The first voltage value is a positive voltage. The first detection sub-circuit 100 includes a first comparator T1. The positive input terminal + of the first comparator T1 is electrically connected to the first voltage signal terminal VG1. The negative input terminal - of the first comparator T1 is electrically connected to the first comparison voltage terminal Vref1. The output terminal Vout of the first comparator T1 is electrically connected to the first switch sub-circuit 400. The power supply terminal of the first comparator T1 is electrically connected to the power supply signal terminal AVDD. The ground terminal GND of the first comparator T1 is grounded.

[0054] The second voltage value is a negative voltage. The second detection sub-circuit 200 includes a second comparator T2. The negative input terminal - of the second comparator T2 is electrically connected to the second voltage signal terminal VG2. The positive input terminal + of the second comparator T2 is electrically connected to the second comparison voltage terminal Vref2. The output terminal Vout of the second comparator T2 is electrically connected to the first switch sub-circuit 400. The power supply terminal of the second comparator T2 is electrically connected to the power supply signal terminal AVDD. The ground terminal GND of the second comparator T2 is grounded.

[0055] The common voltage detection sub-circuit 300 includes a third comparator T3. The positive input terminal + of the third comparator T3 is electrically connected to the common voltage signal terminal VCOM. The negative input terminal - of the third comparator T3 is electrically connected to the first voltage signal terminal VG1. The output terminal Vout of the third comparator T3 is electrically connected to the first switch sub-circuit 400. The power supply terminal of the third comparator T3 is electrically connected to the power supply signal terminal AVDD. The ground terminal GND of the third comparator T3 is grounded.

[0056] The common voltage detection sub-circuit 300 includes a fourth comparator T4. The positive input terminal + of the fourth comparator T4 is electrically connected to the second voltage signal terminal VG2. The negative input terminal - of the fourth comparator T4 is electrically connected to the common voltage signal terminal VCOM. The output terminal Vout of the fourth comparator T4 is electrically connected to the first switch sub-circuit 400. The power supply terminal of the fourth comparator T4 is electrically connected to the power supply signal terminal AVDD. The ground terminal GND of the fourth comparator T4 is grounded.

[0057] It should be noted that the power management chip (PMIC) is used to generate multiple analog reference voltages, such as an analog voltage for outputting the power signal terminal AVDD and an analog voltage for outputting the ground terminal GND. In the embodiments of this application, the power supply terminals of each comparator can be connected to the power management chip, and the configuration can be adjusted as needed in different embodiments.

[0058] like Figure 2 As shown, the first switch sub-circuit 400 includes a switch transistor DT. The control terminal of the switch transistor DT is electrically connected to the output terminal Vout of the first comparator T1, the output terminal Vout of the second comparator T2, the output terminal Vout of the third comparator T3, and the output terminal Vout of the fourth comparator T4. The first terminal of the switch transistor DT is electrically connected to the switch voltage LK terminal, and the second terminal of the switch transistor DT is grounded.

[0059] The output terminal Vout of the first comparator T1 is electrically connected to the control terminal of the switching transistor DT through the first diode D1, and the power supply terminal of the first comparator T1 is electrically connected to the output terminal Vout through the first resistor R1.

[0060] "Control terminal" specifically refers to the gate of the transistor, "first terminal" specifically refers to the source of the transistor, and "second terminal" specifically refers to the drain of the transistor. Of course, those skilled in the art should know that the "first terminal" and "second terminal" are interchangeable, that is, the "first terminal" specifically refers to the drain of the transistor, and the "second terminal" specifically refers to the source of the transistor.

[0061] In this embodiment, the type of switching transistor DT is not limited. For example, the switching transistor DT can be a transistor, a thin-film switching transistor DT, a field-effect transistor, or other devices with the same characteristics. According to the different semiconductor characteristics of transistors, transistors can be divided into N-type transistors and P-type transistors. Specifically, when a transistor is used as a switching transistor DT, an N-type transistor is turned on by a high-level switching control signal and turned off by a low-level switching control signal; a P-type transistor is turned on by a low-level switching control signal and turned off by a high-level switching control signal.

[0062] Based on this, in the embodiments of this application, the effective level of the first control signal, the second control signal, and the third control signal output can be either a high level H or a low level L. Adjustments can be made based on the different types of the switching transistor DT, and this application does not limit this. In this embodiment, an N-type transistor is used as an example for illustrative purposes.

[0063] In this embodiment of the application, the control signal (effective signal of the switching transistor DT) output by each detection sub-circuit can be high level or low level. For example, the switching transistor DT is an N-type switching transistor DT. When all control signals are high level signals, the switching transistor DT is turned on to output signals. When any of the control signals is low level signals, the switching transistor DT is turned off to stop signal output.

[0064] In addition, in this embodiment of the application, the output terminal Vout of the second comparator T2 is electrically connected to the control terminal of the switching transistor DT through the second diode D2, and the power supply terminal of the second comparator T2 is electrically connected to the output terminal Vout through the second resistor R2.

[0065] The output terminal Vout of the third comparator T3 is electrically connected to the control terminal of the switching transistor DT through the third diode D3, and the power supply terminal of the third comparator T3 is electrically connected to the output terminal Vout through the third resistor R3.

[0066] The output terminal Vout of the fourth comparator T4 is electrically connected to the control terminal of the switching transistor DT through the fourth diode D4, and the power supply terminal of the fourth comparator T4 is electrically connected to the output terminal Vout through the fourth resistor R4.

[0067] The control terminal of the switching transistor DT is electrically connected to the ground terminal GND through the fifth resistor R5.

[0068] It should also be noted that in the embodiments of this application, the third comparator T3 and the fourth comparator T4 can be replaced by a dual-limit comparator (window comparator). In the dual-limit comparator, the third diode D3 and the fourth diode D4 can share the same diode, and the third resistor R3 and the fourth resistor R4 can also share the same resistor and be set between the power signal terminal AVDD and the output terminal Vout. This application does not limit this.

[0069] In this embodiment, by placing a diode between the output terminal Vout of each comparator and the control terminal of the switching transistor DT, current backflow can be prevented and detection accuracy can be improved.

[0070] like Figure 3 As shown, in another embodiment of this application, the control circuit further includes a timing controller 500 and a drive controller 600. The timing controller 500 and the drive controller 600 are electrically connected through a second switch sub-circuit 700. The second switch sub-circuit 700 is used to control the conduction and disconnection between the timing controller 500 and the drive controller 600 based on the switch voltage LK provided by the switch voltage LK terminal.

[0071] It should be noted that, in this embodiment, the drive controller 600 can be a source driver. The timing controller 500 is used to output timing signals to the drive controller 600 to generate gamma binding point voltage and data voltage.

[0072] In this embodiment, the second switch sub-circuit 700 is used to control the connection between the timing controller 500 and the drive controller 600. The switching voltage LK is the handshake signal between the timing controller 500 and the drive controller 600. Of course, in other embodiments, the second switch sub-circuit 700 can also be used to control the connection between the power management chip and the drive controller 600. The power management chip is used to provide power signals to the drive controller 600. The settings are configured as needed in different embodiments.

[0073] In other embodiments of this application, depending on the number of detected voltage signals, the number of the first detection sub-circuit 100 and the second detection sub-circuit 200 may be multiple, and the control circuit further includes:

[0074] A fifth comparator T5 is used to detect positive voltage. The first detection sub-circuit 100 includes a fifth comparator T5. The positive input terminal + of the fifth comparator T5 is electrically connected to the fifth voltage signal terminal VG5. The negative input terminal - of the fifth comparator T5 is electrically connected to the fifth comparison voltage terminal Vref5. The output terminal Vout of the fifth comparator T5 is electrically connected to the first switch sub-circuit 400. The power supply terminal of the fifth comparator T5 is electrically connected to the power supply signal terminal AVDD. The ground terminal GND of the fifth comparator T5 is grounded.

[0075] A sixth comparator T6 is used to detect negative polarity voltage. The second detection sub-circuit 200 includes a sixth comparator T6. The negative input terminal - of the sixth comparator T6 is electrically connected to the sixth voltage signal terminal VG6. The positive input terminal + of the sixth comparator T6 is electrically connected to the sixth comparison voltage terminal Vref6. The output terminal Vout of the sixth comparator T6 is electrically connected to the first switch sub-circuit 400. The power supply terminal of the sixth comparator T6 is electrically connected to the power supply signal terminal AVDD. The ground terminal GND of the sixth comparator T6 is grounded.

[0076] In different embodiments, the number of comparators can be increased or decreased depending on the number of signal lines to be detected, and this application is not limited in this regard. For example, the fifth voltage signal terminal VG5 can be a GMA14 signal, the fifth comparison voltage terminal Vref5 can be a GMA13 signal, the sixth voltage signal terminal VG6 can be a GMA1 signal, and the fifth comparison voltage terminal Vref5 can be a GMA2 signal.

[0077] Based on the same inventive concept, such as Figure 4-6 As shown, this application provides a method for controlling a display panel, employing a control circuit for a display panel as described above, the method comprising:

[0078] The first detection sub-circuit 100 detects the first voltage value of the first voltage signal terminal VG1 and generates a first control signal based on the detection result;

[0079] The second detection sub-circuit 200 detects the second voltage value of the second voltage signal terminal VG2 and generates a second control signal based on the detection result;

[0080] The common voltage detection sub-circuit 300 detects the common voltage value of the common voltage signal terminal VCOM based on the first voltage value of the first voltage signal terminal VG1 and the second voltage value of the second voltage signal terminal VG2, and generates a third control signal based on the detection result;

[0081] The first switch sub-circuit 400 controls the output of the switch voltage LK based on the first control signal, the second control signal, and the third control signal.

[0082] During signal detection, the voltage at the first voltage signal terminal VG1 of the first comparator T1 is compared with the voltage at the first comparison voltage terminal Vref1 of the first comparator T1. If VG1 is lower than Vref1, the first comparator T1 outputs L; if VG1 is higher than Vref1, the first comparator T1 outputs H. Similarly, the voltage at the second voltage signal terminal VG2 of the second comparator T2 is compared with the voltage at the second comparison voltage terminal Vref2 of the second comparator T2. If VG2 is higher than Vref2, the second comparator T2 outputs L; if VG2 is lower than Vref2, the second comparator T2 outputs H. Finally, the voltage at the second voltage signal terminal VG2 of the fourth comparator T4 is compared with the voltage at the common voltage signal terminal VCOM of the third comparator T3. If VCOM is lower than VG1, the fourth comparator T4 outputs L; if VCOM is higher than VG1, the fourth comparator T4 outputs H.

[0083] It is understood that in the embodiments of this application, the high-level signal H output by each comparator is the voltage VAVDD of the power supply signal terminal AVDD, and the low-level signal L is the voltage 0V of the ground terminal GND. Other settings may be used as needed in different embodiments, and this application does not limit them.

[0084] It should be noted that in this embodiment, the first voltage signal of the first voltage signal terminal VG1 is a positive voltage. When the first voltage signal terminal VG1 is abnormally low compared to the normal voltage, the display will not be significantly affected and no obvious abnormality will occur. When the first voltage signal terminal VG1 is abnormally high compared to the normal voltage, obvious problems such as abnormal display brightness, uneven gradation, and noise will occur.

[0085] The second voltage signal of the second voltage signal terminal VG2 is a negative voltage. When the second voltage signal terminal VG2 is abnormally high compared to the normal voltage, the display will not be significantly affected and no obvious abnormalities will occur. When the second voltage signal terminal VG2 is abnormally low compared to the normal voltage, obvious problems such as abnormal display brightness, uneven gradation, and noise will occur.

[0086] The VCOM signal requires simultaneous comparison of the first and second voltage signals. It is only displayed normally when VG1 > VCOM > VG2, and the display effect will not be significantly affected. However, when other voltages are abnormal, the display will show obvious problems such as abnormal brightness, uneven gradation, and noise.

[0087] In addition, in this embodiment of the application, the output terminal Vout of each comparator is connected in parallel to the control terminal of the switching transistor DT. When the output terminal Vout of any comparator is at a high level H (i.e. when the display is abnormal), the switching transistor DT is turned on, the switching voltage LK terminal is grounded, and the switching voltage LK output of the switching voltage LK terminal is a low level signal.

[0088] In this embodiment, when display anomaly protection is performed, a second switching sub-circuit 700 is provided between the timing controller 500 and the drive controller 600. The second switching sub-circuit 700 connects the timing controller 500 and the drive controller 600 based on a normal switching voltage LK (high-level signal) provided by the switching voltage LK terminal. The timing controller 500 then normally provides timing signals to the drive controller 600, and the display panel displays normally. Conversely, the second switching sub-circuit 700 disconnects the electrical connection between the timing controller 500 and the drive controller 600 based on a low-level switching voltage LK provided by the switching voltage LK terminal, thereby shutting down the display panel's display operation.

[0089] This application also provides a display device, including a control circuit for a display panel as described in any of the above descriptions. This display device can be applied to any product or component with a display function, such as mobile phones, tablets, televisions, monitors, laptops, digital photo frames, and navigators.

[0090] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0092] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for descriptive purposes only and is not intended to limit the invention. Terms such as “set” appearing herein can refer to either a component being directly attached to another component or a component being attached to another component via an intermediary. A feature described in one embodiment herein may be applied, alone or in combination with other features, to another embodiment, unless that feature is not applicable in that other embodiment or is otherwise stated.

[0093] The present invention has been described through the above embodiments; however, it should be understood that the above embodiments are for illustrative purposes only and are not intended to limit the present invention to the described embodiments. Those skilled in the art will understand that many variations and modifications can be made based on the teachings of the present invention, and all such variations and modifications fall within the scope of protection claimed by the present invention.

Claims

1. A control circuit for a display panel, characterized in that, include: The first detection sub-circuit is used to detect the first voltage value at the first voltage signal terminal and generate a first control signal based on the detection result. The second detection sub-circuit is used to detect the second voltage value at the second voltage signal terminal and generate a second control signal based on the detection result. A common voltage detection sub-circuit is used to detect the common voltage value of the common voltage signal terminal based on the first voltage value of the first voltage signal terminal and the second voltage value of the second voltage signal terminal, and to generate a third control signal based on the detection result; A first switching sub-circuit is used to control the output of the switching voltage based on the first control signal, the second control signal, and the third control signal. The common voltage detection sub-circuit includes a third comparator, the positive input terminal of which is electrically connected to the common voltage signal terminal, and the negative input terminal of which is electrically connected to the first voltage signal terminal. The common voltage detection sub-circuit includes a fourth comparator, the positive input terminal of which is electrically connected to the second voltage signal terminal, and the negative input terminal of which is electrically connected to the common voltage signal terminal. The first voltage value is a positive voltage that is greater than the common voltage value; the second voltage value is a negative voltage that is less than the common voltage value.

2. The control circuit for the display panel according to claim 1, characterized in that, The first detection sub-circuit includes a first comparator, the positive input terminal of the first comparator is electrically connected to the first voltage signal terminal, the negative input terminal of the first comparator is electrically connected to the first comparison voltage terminal, the output terminal of the first comparator is electrically connected to the first switch sub-circuit, the power supply terminal of the first comparator is electrically connected to the power supply signal terminal, and the ground terminal of the first comparator is grounded.

3. The control circuit for the display panel according to claim 2, characterized in that, The second detection sub-circuit includes a second comparator. The negative input terminal of the second comparator is electrically connected to the second voltage signal terminal, the positive input terminal of the second comparator is electrically connected to the second comparison voltage terminal, the output terminal of the second comparator is electrically connected to the first switch sub-circuit, the power supply terminal of the second comparator is electrically connected to the power supply signal terminal, and the ground terminal of the second comparator is grounded.

4. The control circuit for the display panel according to claim 3, characterized in that, The output terminal of the third comparator is electrically connected to the first switch sub-circuit, the power supply terminal of the third comparator is electrically connected to the power signal terminal, and the ground terminal of the third comparator is grounded.

5. The control circuit for the display panel according to claim 4, characterized in that, The output terminal of the fourth comparator is electrically connected to the first switch sub-circuit, the power supply terminal of the fourth comparator is electrically connected to the power signal terminal, and the ground terminal of the fourth comparator is grounded.

6. The control circuit for the display panel according to claim 5, characterized in that, The first switching sub-circuit includes a switching transistor, and the control terminal of the switching transistor is electrically connected to the output terminal of the first comparator, the output terminal of the second comparator, the output terminal of the third comparator, and the output terminal of the fourth comparator. The first terminal of the switching transistor is electrically connected to the switching voltage terminal, and the second terminal of the switching transistor is grounded.

7. The control circuit for the display panel according to claim 6, characterized in that, The output terminal of the first comparator is electrically connected to the control terminal of the switching transistor through a first diode; the output terminal of the second comparator is electrically connected to the control terminal of the switching transistor through a second diode; the output terminal of the third comparator is electrically connected to the control terminal of the switching transistor through a third diode; and the output terminal of the fourth comparator is electrically connected to the control terminal of the switching transistor through a fourth diode.

8. The control circuit for the display panel according to claim 6, characterized in that, It also includes a timing controller and a drive controller. The timing controller and the drive controller are electrically connected through a second switching sub-circuit. The second switching sub-circuit is used to control the conduction and disconnection between the timing controller and the drive controller based on the switching voltage provided by the switching voltage terminal.

9. A method for controlling a display panel, characterized in that, The method, employing the control circuit of the display panel as described in any one of claims 1-8, comprises: The first detection sub-circuit detects the first voltage value at the first voltage signal terminal and generates a first control signal based on the detection result; The second detection sub-circuit detects the second voltage value at the second voltage signal terminal and generates a second control signal based on the detection result; The common voltage detection sub-circuit detects the common voltage value of the common voltage signal terminal based on the first voltage value of the first voltage signal terminal and the second voltage value of the second voltage signal terminal, and generates a third control signal based on the detection result; The first switching sub-circuit controls the output of the switching voltage based on the first control signal, the second control signal, and the third control signal.

10. A display device, characterized in that, Includes the control circuit of the display panel as described in any one of claims 1-8.

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