Screen detection circuit, device and display screen

Abstract

The present invention discloses a screen detection circuit, device and display screen. The screen detection circuit includes: an output interface and a detection unit, wherein the output interface is used to output a detection signal to determine the working state of the screen through the detection signal; the detection unit has an output end, a power supply end, and a first detection end and / or a second detection end, the first detection end is used to connect to the first power supply of the screen refresh circuit, the second detection end is used to connect to the second power supply of the screen refresh circuit, the power supply end is connected to a preset power supply, the output end is connected to the output interface, the detection unit is used to detect the power supply status of the first power supply and / or the second power supply, and output a corresponding detection signal through the output interface. The present invention can detect screen status abnormalities caused by display panel abnormalities or driver chip abnormalities, and can be applied to screens with multiple interfaces, with strong versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of electrostatic detection, and in particular to a screen detection circuit, device and display screen. Background Art

[0002] Currently, large-screen components (commonly used in air conditioners, flat-panel computers, and monitors) primarily utilize four types of interfaces: LVDS (Low-Voltage Differential Signaling), MIPI (Mobile Industry Processor Interface), EDP (Embedded Display Port), and HDMI (High Definition Multimedia Interface). MIPI, EDP, and HDMI screens cannot be tested via software because some driver chipsets do not support software readback. Even if software testing is available, it only checks the status of the driver chip, limiting its ability to determine the operating status of the display panel. LVDS screens lack a software readback mechanism, meaning the main control circuitry cannot read the screen's operating status via software. When the screen experiences soft failures such as distorted or black screens due to ESD (electrostatic discharge) interference, the main control circuitry cannot restart the screen or restore the display. Summary of the Invention

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, a first object of the present invention is to provide a screen detection circuit that can detect screen status abnormalities caused by display panel or driver chip abnormalities. The circuit is applicable to screens with various interfaces and has high versatility.

[0004] A second objective of the present invention is to provide a screen detection device.

[0005] A third object of the present invention is to provide a display screen.

[0006] To achieve the above-mentioned purpose, an embodiment of the first aspect of the present invention provides a screen detection circuit, including: an output interface for outputting a detection signal, wherein the detection signal is used to determine the working status of the screen; a detection unit, wherein the detection unit has an output end, a power supply end, and a first detection end and / or a second detection end, the first detection end is used to connect to the first power supply of the screen refresh circuit, the second detection end is used to connect to the second power supply of the screen refresh circuit, the power supply end is connected to a preset power supply, the output end is connected to the output interface, and the detection unit is used to detect the power supply status of the first power supply and / or the second power supply, and output the corresponding detection signal through the output interface.

[0007] According to the screen detection circuit of an embodiment of the present invention, the power supply conditions of the first power supply and the second power supply of the screen refresh circuit are detected by a detection unit, and a corresponding detection signal is output through an output interface according to the power supply conditions of the first power supply and the second power supply, so that an external circuit can determine the working status of the screen according to the detection signal, thereby realizing the detection of screen status abnormalities caused by display panel abnormalities or driver chip abnormalities, and simultaneously detecting the power supply conditions of the first power supply and the second power supply, thereby improving the reliability of screen abnormality detection.

[0008] To achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes a screen detection device, comprising: the screen detection circuit described above; a main control circuit, wherein the main control circuit is connected to the output interface of the screen detection circuit, and is used to determine the working status of the screen based on the detection signal output by the output interface.

[0009] According to the screen abnormality detection device of an embodiment of the present invention, after the screen detection circuit outputs a detection signal, the main control circuit can determine the working status of the screen based on the detection signal, thereby realizing the detection of screen status abnormalities caused by display panel abnormalities or driver chip abnormalities.

[0010] To achieve the above-mentioned object, a third embodiment of the present invention provides a display screen, comprising the above-mentioned screen detection device.

[0011] According to the display screen of the embodiment of the present invention, the above-mentioned screen detection device can realize the detection of screen state abnormality caused by display panel abnormality or driver chip abnormality, and the screen detection device thereon is suitable for the detection of various interface screens and has strong versatility.

[0012] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1is a structural block diagram of a screen detection circuit according to an embodiment of the present invention;

[0014] Figure 2 is a topological diagram of a screen detection circuit according to an embodiment of the present invention;

[0015] Figure 3 is a structural block diagram of a screen detection device according to an embodiment of the present invention;

[0016] Figure 4 FIG. 4 is a structural block diagram of a display screen according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] Embodiments of the present invention are described in detail below. Examples of the embodiments described below are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0018] As described in the background technology, at present, there are mainly four types of screen interfaces for large-screen components (commonly used for air conditioners, flat panels, and monitors), namely LVDS, MIPI, EDP, and HDMI interfaces. Among them, MIPI, EDP, and HDMI screens cannot be detected by software because their driver chips do not support software readback. Even if there is a software detection method, it can only detect the status of the screen driver chip, and the ability to detect the working status of the display panel is limited; the LVDS screen has no software readback mechanism, that is, the main control circuit cannot read the working status of the screen by software. When the screen is interfered with by ESD and a soft failure occurs, such as a flowery screen or a black screen, the main control circuit cannot restart the screen or restore the display, which is fatal to the electrostatic design.

[0019] To this end, the present invention provides a detection circuit. When static electricity is generated and causes the screen state to be abnormal, whether it is an abnormal screen display panel or an abnormal driver chip, the positive and negative power supplies provided to the screen refresh circuit will change, so that the positive and negative power supplies provided to the screen refresh circuit can be detected by the screen detection circuit of the present invention, and a low-level signal can be output so that after the main control circuit receives the low-level signal, it can determine that the current state of the screen is an abnormal state and restart the screen to restore the normal display of the screen and reduce the impact on the user. The screen detection circuit of the present invention can detect the working state of screens with MIPI, EDP, HDMI interfaces or other types of screens, and whether the screen state is abnormal due to an abnormal screen display panel or an abnormal driver chip, it can be detected by the detection circuit to resolve the soft failure of the screen.

[0020] Please refer to the following Figure 1-4The screen detection circuit, device and display screen according to the embodiments of the present invention are described.

[0021] like Figure 1-2 As shown, the screen detection circuit 100 may include an output interface 10 and a detection unit 20. The output interface 10 is used to output a detection signal, which is used to determine the working state of the screen. The detection unit 20 has an output terminal (not shown), a power supply terminal (not shown), and a first detection terminal A1 and / or a second detection terminal A2. The first detection terminal A1 is used to connect to the first power supply VGH of the screen refresh circuit, and the second detection terminal A2 is used to connect to the second power supply VGL of the screen refresh circuit. The power supply terminal is connected to a preset power supply, and the output terminal is connected to the output interface 10. The detection unit 20 is used to detect the power supply status of the first power supply VGH and / or the second power supply VGL, and output a corresponding detection signal through the output interface 10.

[0022] Specifically, the detection circuit of this embodiment can be applied to screens with LVDS, MIPI, EDP, HDMI interfaces or other screens. All of the above interface screens are equipped with VGH and VGL power supply circuits. The VGH and VGL in this embodiment are generated by the charge pump or DC-DC conversion circuit inside the screen driver chip, which are used to provide positive and negative power supplies to the refresh circuit of the screen display panel. For example, VGH is used to provide positive power supply, and VGL is used to provide negative power supply. The refresh circuit in this embodiment is distributed in the frame and internal pixel circuit of the screen display panel. When the screen fails due to electrostatic interference, such as black screen, stuck screen and distorted screen, the voltage of both positive and negative power supplies will change. Therefore, the detection circuit of this embodiment can detect the positive power supply VGH and negative power supply VGL through the A1 terminal and / or A2 terminal respectively, and output a detection signal based on the high and low levels of the detected VGH and / or VGL, so that the external circuit, such as the main control circuit, can obtain the current working status of the screen based on the detection signal. In this embodiment, when the detection signal is a low-level signal, it can be determined that the current working state of the screen is an abnormal state, and when the detection signal is a high-level signal, it can be determined that the current working state of the screen is a normal state.

[0023] It should be noted that the voltage of the preset power supply in this embodiment can be the interface voltage for communication between the main control circuit and the screen, and its voltage value is generally 1.8V or 3.3V. In this embodiment, when the screen is in a normal working state, the positive power supply VGH provided to the refresh circuit of the screen display panel is in a first range, and the negative power supply VGL provided to the refresh circuit of the screen display panel is in a second range; wherein the lower limit value of the second range is the opposite of the upper limit value of the first range, and the upper limit value of the second range is the opposite of the lower limit value of the first range. For example, when the screen is in a normal working state, the voltage values ​​of the positive power supply VGH and the negative power supply VGL provided to the refresh circuit of the screen display panel are 9 to 15V and -15 to -9V, respectively. When the screen is in an abnormal working state, the voltage values ​​of VGH and VGL change and cannot be maintained within the above ranges, wherein the voltage becomes 0 when the driver chip stops working.

[0024] In one embodiment of the present invention, Figure 2 As shown, the detection unit 20 may include a first detection sub-circuit, wherein the first detection sub-circuit has a first detection terminal A1, a first power supply terminal VI1 and a first output terminal P1, the first power supply terminal VI1 is connected to the power supply terminal, the first output terminal P1 is connected to the output terminal, and the first detection sub-circuit is used to detect the power supply status of the first power supply VGH.

[0025] Further, such as Figure 2 As shown, the first detection subcircuit may include: a first resistor R1, a second resistor R2, a second switch S2 and a third switch S3, wherein R1 and R2 are connected in series between the first detection terminal A1 and the ground; a first end of S2 is connected to the first power supply terminal VI1 through the third resistor R3, a control end of S2 is connected to the node between the first resistor R1 and the second resistor R2, and a second end of S2 is grounded; a first end of S3 is connected to P1, and a first end of S3 is also connected to the first power supply terminal VI1 through a fourth resistor R4, a control end of S3 is connected to the first end of S2, and a second end of S3 is grounded.

[0026] Specifically, when the first detection sub-circuit is used for detection, the level state of VGH can be used to detect whether the screen state is abnormal. Specifically, when VGH is at a low level, the second switch S2 is closed, and the voltage at the first end of the second switch S2 is pulled high, thereby turning on the third switch S3, and the output end voltage is pulled low. The output end outputs a low-level signal, that is, the detection signal output by the output interface 10 is a low-level signal. The main control circuit can determine that the current working state of the screen is abnormal based on the low-level signal. Therefore, as long as the first detection sub-circuit detects that VGH is at a low level, the main control circuit can determine that the screen is abnormal. In this embodiment, the first detection sub-circuit can be used to detect whether the screen is abnormal, which effectively simplifies the topology of the screen detection circuit and saves hardware costs.

[0027] Optionally, the detection unit 20 may also include a first switch S1 and a second detection sub-circuit, wherein the first end of the first switch S1 is connected to the output end, and the second end of the first switch S1 is grounded; the second detection sub-circuit has a second detection end A2, a second power supply end VI2 and a second output end P2, the second power supply end VI2 is connected to the power supply end, and the second output end P2 is connected to the control end of the first switch S1, and the second detection sub-circuit is used to detect the power supply status of the second power supply, wherein when the screen is in normal working condition, the voltage of the first power supply, i.e., VGH, is a high-level voltage, and the voltage of the second power supply, i.e., VGL, is a low-level voltage.

[0028] It should be noted that the power supply voltage of VI2 is the same as that of VI1, both of which are interface voltages used for communication between the main control circuit and the screen, and their voltage values ​​are generally 1.8V or 3.3V.

[0029] Further, such as Figure 2 As shown, the second detection sub-circuit may include: a fifth resistor R5, a sixth resistor R6, a fourth switch S4 and a fifth switch S5, wherein R5 and R6 are connected in series between the second power supply terminal VI2 and the second detection terminal A2; a first end of S4 is connected to the second power supply terminal VI2 through a seventh resistor R7, a control end of S4 is connected to a node between R5 and R6, and a second end of S4 is connected to the A2 end; a first end of S5 is connected to the second output terminal P2, a first end of S5 is also connected to the second power supply terminal VI2 through an eighth resistor R8, a control end of S5 is connected to the first end of S4, and a second end of S5 is grounded.

[0030] The first to fifth switches are at least one of an NMOS tube, a transistor, a switch IC, and a programmable gate array.

[0031] Specifically, the detection unit 20 may only include a first switch S1 and a second detection sub-circuit, wherein VGL can be detected through the detection terminal A2, and high and low level signals can be output through the output interface 10 according to the changes of VGL, so that the external circuit can determine the current working status of the screen according to the high and low level signals.

[0032] For example, when VGL is at a high level, the fourth switch S4 is turned on, the voltage at the first terminal of the fourth switch S4 is pulled down, the fifth switch S5 is turned off, the voltage at the second output terminal P2 is pulled up, and the first switch S1 is turned on, the output terminal voltage is pulled down, and the output terminal outputs a low-level signal. That is, the detection signal output by the output interface 10 is a low-level signal. The main control circuit can determine that the current operating state of the screen is abnormal based on this low-level signal. Therefore, as long as the second detection sub-circuit detects that VGL is at a high level, the main control circuit can determine that the screen is abnormal. In this embodiment, the second detection sub-circuit can be used to detect whether the screen is abnormal, effectively simplifying the topology of the screen detection circuit and saving hardware costs.

[0033] Of course, to make screen abnormality detection more comprehensive, such as determining whether the screen abnormality is caused by positive electrostatic interference, negative electrostatic interference, or an abnormality in the screen driver chip, detection terminals A1 and A2 can respectively detect VGH and VGL, and output high and low level signals through output interface 10 based on the changes in VGH and VGL, so that an external circuit can determine the current operating status of the screen based on the high and low level signals. In other words, the first detection sub-circuit and the second detection sub-circuit simultaneously detect whether the screen is abnormal and detect the specific cause of the screen abnormality.

[0034] As described above, when the screen is in a normal working state, the voltage of the first power supply VGH is a high-level voltage, and the voltage of the second power supply VGL is a low-level voltage.

[0035] Specifically, the high and low voltage levels of VGH and VGL in this embodiment correspond to the state of the screen. Specifically, when the screen displays normally, the voltage of VGH is within the first interval, i.e., the normal range of 9 to 15V, and the voltage of VGL is within the second interval, i.e., the normal range of -15 to -9V, i.e., VGH is high and VGL is low. As shown in Table 1, when the screen displays normally, VGH is high and VGL is low. At this time, S2 is turned on, the voltage at the first terminal of S2 is pulled low, and S3 is turned off. Then, R3 and R5 are adjusted to appropriate resistances to turn off S4, and the first terminal of S4 is pulled high and pulled up to VI2. S5 is turned on, the output terminal P2 is pulled low, and S1 is turned off. When S1 and S3 are turned off, the output terminal is pulled high to VI1, and the output interface 10 outputs a high-level signal. When the main control circuit detects the high-level signal output by the output interface 10, it can be determined that the screen is normal. Therefore, when the first detection sub-circuit and the second detection sub-circuit respectively detect that VGH is at a high level and VGL is at a low level, it can be determined that the screen is in a normal state.

[0036] Table 1

[0037]

[0038]

[0039] When the working state of the screen is abnormal, the detection terminal A1 in the first detection sub-circuit and the detection terminal A2 in the second detection sub-circuit can be used to detect VGH and VGL respectively, so as to locate the specific cause of the screen abnormality according to VGH and VGL. Among them, VGH and VGL have the following three states:

[0040] (1) VGH is greater than a first voltage preset value, and VGL is greater than a second voltage preset value, wherein the first voltage preset value is greater than or equal to the lower limit value of the first interval, and the second voltage preset value is greater than the upper limit value of the second interval, wherein the first interval is 9 to 15V as described above, and the second interval is -15 to -9V. For example, VGH is greater than 9V and VGL is greater than -8V, that is, VGH is at a high level and VGL is at a high level. At this time, it indicates that the screen is subjected to positive electrostatic interference and the screen will display abnormally. Specifically, when VGH and VGL are both at a high level, S2 is turned on, the first end of S2 is pulled low, and S3 is turned off. Then, R3 and R5 are adjusted to appropriate resistances so that when VGL is high, S4 is turned on, the first end of S4 is pulled low, S5 is turned off, the output terminal P2 is pulled high, S1 is turned on, and the output interface 10 outputs a low-level signal. Therefore, when it is detected that the output interface 10 outputs a low-level signal, it can be determined that the screen is abnormal. Then, when the first detection sub-circuit and the second detection sub-circuit respectively detect that VGH and VGL are both high levels, it can be further determined that the cause of the screen abnormality is that the screen is subjected to positive electrostatic interference.

[0041] (2) VGH is less than the third voltage preset value, and VGL is less than the fourth voltage preset value, wherein the third voltage preset value is less than the lower limit value of the first interval, and the fourth voltage preset value is less than or equal to the upper limit value of the second interval. For example, VGH is less than 8V, and VGL is less than -9V, that is, VGH is low level, and VGL is low level. At this time, it indicates that the screen is subject to negative electrostatic interference, and the screen will display abnormally. When VGH and VGL are both low levels, the resistors R1 and R2 can be adjusted to appropriate resistances so that S2 is closed, the first end of S2 is pulled up to VI1, S3 is turned on, the output end P1 is pulled low, and the output interface 10 outputs a low-level signal. Therefore, when it is detected that the output interface 10 outputs a low-level signal, it can be determined that the screen is abnormal. Then, when the first detection sub-circuit and the second detection sub-circuit respectively detect that VGH and VGL are both low levels, it can be further determined that the cause of the screen abnormality is that the screen has been subject to negative electrostatic interference.

[0042] (3) VGH is less than the third voltage preset value, and VGL is greater than the second voltage preset value. The third voltage preset value is less than the lower limit of the first interval, and the second voltage preset value is greater than the upper limit of the second interval. For example, VGH is less than 8V, and VGL is greater than -8V, that is, VGH is low and VGL is high, indicating that the driver chip of the screen is not working and the display screen is abnormal. When VGH is low, S2 is closed, the first end of S2 is pulled up to VI1, S3 is turned on, the output end P1 is pulled low, and the output interface 10 outputs a low-level signal. Therefore, when it is detected that the output interface 10 outputs a low-level signal, it can be determined that the screen is abnormal. Then, when the first detection sub-circuit and the second detection sub-circuit respectively detect that VGH is low and VGL is high, it can be further determined that the cause of the screen abnormality is an abnormality in the driver chip of the screen.

[0043] In this embodiment, when the output interface 10 outputs a low-level signal, the screen can be determined to be operating abnormally. When the output interface 10 outputs a high-level signal, the screen can be determined to be operating normally. Furthermore, when the screen is determined to be operating abnormally, the cause of the screen display abnormality can be analyzed based on the VGH and VGL levels detected at terminals A1 and A2. For example, when both VGH and VGL are detected to be high, it can be determined that the screen is experiencing positive electrostatic interference. When both VGH and VGL are detected to be low, it can be determined that the screen is experiencing negative electrostatic interference. When VGH is low and VGL is high, it can be determined that the screen driver chip is abnormal. Therefore, the screen detection circuit in this embodiment can simultaneously detect VGH and VGL through the first detection sub-circuit and the second detection sub-circuit, and detect the abnormal screen state based on the specific states of VGH and VGL, thereby locating the specific cause of the screen abnormality. Compared to a screen detection circuit that only includes the first detection sub-circuit or the second detection sub-circuit, this can further improve the reliability and comprehensiveness of screen status detection.

[0044] Optionally, the output interface 10 can be connected to an external circuit, such as an interrupt port or a general-purpose input / output port of a main control circuit, so that the main control circuit can determine whether the screen is operating abnormally based on the received high and low level signals. If the screen's operating state is determined to be abnormal, the main control circuit can reset or restart the screen to resolve the soft failure of the screen. It should be noted that when a hard failure of the screen occurs, this detection circuit can also be used to detect it, resolve the hard failure, and upload a log.

[0045] Furthermore, because VGH or VGL have external capacitors on the screen's printed circuit board, this detection circuit doesn't require modifications to the screen's display panel driver chip or display panel. The detection circuit can simply be added to the screen's printed circuit board or the mainboard housing the main control circuit, making it easy to implement and requiring minimal modification, thus effectively avoiding the long and risky process of modifying the screen's display panel driver chip and display panel.

[0046] As mentioned above, since the VGH or VGL power supply circuit is distributed on all interface screens and has basically the same functions, that is, whether it is an LVDS / MIPI / HDMI / DP interface screen or other interface screen, the detection circuit can be used, and has strong versatility. In addition, since the detection circuit can simultaneously detect the VGH / VGL two-way power supply, the abnormal detection of the screen is more comprehensive and more comprehensive and reliable than the commonly used software readback mechanism.

[0047] To summarize, the screen detection circuit of the embodiment of the present invention detects the power supply conditions of the first power supply and the second power supply of the screen refresh circuit through a detection unit, and outputs a corresponding detection signal through an output interface according to the power supply conditions of the first power supply and the second power supply, so that an external circuit can determine the working state of the screen according to the detection signal, thereby realizing the detection of screen state abnormalities caused by display panel abnormalities or driver chip abnormalities, and simultaneously detecting the power supply conditions of the first power supply and the second power supply, thereby improving the reliability of screen abnormality detection.

[0048] In order to achieve the above object, the present invention also proposes a screen detection device 1000, such as Figure 3 As shown, the screen detection device 1000 may include the above-mentioned screen detection circuit 100 and the main control circuit 200. The main control circuit 200 is connected to the output interface 10 of the screen detection circuit 100 and is used to determine the working status of the screen according to the detection signal output by the output interface 10.

[0049] Specifically, the output interface 10 can be connected to the interrupt port or general input and output port of the main control circuit 200, so that the main control circuit 200 can determine whether the screen is working abnormally based on the high and low level signals received, and reset or restart the screen when it is determined that the working state of the screen is abnormal.

[0050] In one embodiment of the present invention, the main control circuit 200 can be specifically configured to: determine that the working state of the screen is normal when the detection signal is at a high level; and determine that the working state of the screen is abnormal when the detection signal is at a low level.

[0051] According to the screen abnormality detection device of an embodiment of the present invention, after the screen detection circuit outputs a detection signal, the main control circuit can determine the working status of the screen based on the detection signal, thereby realizing the detection of screen status abnormalities caused by display panel abnormalities or driver chip abnormalities.

[0052] To achieve the above object, the present invention also proposes a display screen 10000, such as Figure 4 As shown, the above-mentioned screen detection device 1000 is also included.

[0053] According to the display screen of the embodiment of the present invention, the above-mentioned screen detection device can realize the detection of screen state abnormality caused by display panel abnormality or driver chip abnormality, and the screen detection device thereon is suitable for the detection of various interface screens and has strong versatility.

[0054] It should be noted that the logic and / or steps represented or otherwise described herein, which can be considered, for example, as a sequenced list of executable instructions for implementing the logical functions, can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection having one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0055] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0056] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood 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 at least one of such features. In the description of the present invention, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined. Relational terms such as first and second are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise," "include," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. Without further limitation, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0059] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0060] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0061] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0062] Each embodiment in this specification is described in a related manner. Similar portions between the various embodiments can be referenced to each other. Each embodiment focuses on the differences between the other embodiments. In particular, the device, electronic device, and computer-readable storage medium embodiments are generally similar to the method embodiments, so their descriptions are relatively simple. For related portions, reference can be made to the descriptions of the method embodiments.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A screen detection circuit, characterized in that: include: An output interface, configured to output a detection signal, wherein the detection signal is used to determine the working status of the screen; a detection unit having an output end, a power supply end, and a first detection end and a second detection end, wherein the first detection end is used to connect to a first power supply of a screen refresh circuit, and the second detection end is used to connect to a second power supply of the screen refresh circuit, the power supply end is connected to a preset power supply, the output end is connected to the output interface, and the detection unit is used to detect the power supply status of the first power supply and / or the second power supply, and output a corresponding detection signal through the output interface; The detection unit comprises: a first detection subcircuit, the first detection subcircuit having the first detection end, a first power supply end, and a first output end, the first power supply end being connected to the power supply end, the first output end being connected to the output end, the first detection subcircuit being configured to detect a power supply condition of the first power supply; The first detection sub-circuit includes: a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series between the first detection terminal and ground; a second switch, wherein a first end of the second switch is connected to the first power supply end via a third resistor, a control end of the second switch is connected to a node between the first resistor and the second resistor, and a second end of the second switch is grounded; a third switch, wherein a first end of the third switch is connected to the first output end, a first end of the third switch is further connected to the first power supply end via a fourth resistor, a control end of the third switch is connected to the first end of the second switch, and a second end of the third switch is grounded.

2. The screen detection circuit according to claim 1, wherein: The detection unit comprises: a first switch, wherein a first end of the first switch is connected to the output end, and a second end of the first switch is grounded; The second detection sub-circuit has a second detection end, a second power supply end and a second output end, the second power supply end is connected to the power supply end, and the second output end is connected to the control end of the first switch. The second detection sub-circuit is used to detect the power supply status of the second power supply; wherein, when the working state of the screen is normal, the voltage of the first power supply is a high-level voltage, and the voltage of the second power supply is a low-level voltage.

3. The screen detection circuit according to claim 2, wherein: The second detection sub-circuit includes: a fifth resistor and a sixth resistor, wherein the fifth resistor and the sixth resistor are connected in series between the second power supply terminal and the second detection terminal; a fourth switch, wherein a first end of the fourth switch is connected to the second power supply end via a seventh resistor, a control end of the fourth switch is connected to a node between the fifth resistor and the sixth resistor, and a second end of the fourth switch is connected to the second detection end; a fifth switch, wherein a first end of the fifth switch is connected to the second output end, a first end of the fifth switch is also connected to the second power supply end through an eighth resistor, a control end of the fifth switch is connected to the first end of the fourth switch, and a second end of the fifth switch is grounded.

4. The screen detection circuit according to claim 3, wherein: The first to fifth switches are at least one of an NMOS tube, a transistor, a switch IC, and a programmable gate array.

5. A screen detection device, characterized in that: include: The screen detection circuit according to any one of claims 1 to 4; A main control circuit is connected to the output interface of the screen detection circuit and is used to determine the working state of the screen according to the detection signal output by the output interface.

6. The screen detection device according to claim 5, wherein: The main control circuit is specifically used for: When the detection signal is at a high level, determining that the working state of the screen is normal; When the detection signal is at a low level, it is determined that the working state of the screen is abnormal.

7. The screen detection device according to claim 5, wherein: When the main control circuit determines that the working state of the screen is abnormal, the main control circuit is further configured to: Reset or restart control is performed on the screen.

8. A display screen, characterized in that: The device comprises the screen detection device as claimed in claim 7.

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