CN115877168A - Screen detection circuit, device and display screen - Google Patents

Abstract

The invention discloses a screen detection circuit, a screen detection device and a display screen. Wherein, screen detection circuitry includes: the device comprises an output interface and a detection unit, wherein the output interface is used for outputting a detection signal so as to determine the working state of a screen through the detection signal; the detection unit is provided with an output end, a power supply end, a first detection end and/or a second detection end, the first detection end is used for being connected with a first power supply of the screen refreshing circuit, the second detection end is used for being connected with a second power supply of the screen refreshing circuit, the power supply end is connected to a preset power supply, the output end is connected with the output interface, and the detection unit is used for detecting the power supply condition of the first power supply and/or the second power supply and outputting a corresponding detection signal through the output interface. The invention can detect the abnormal screen state caused by the abnormal display panel or the abnormal driving chip, and can be applied to various interface screens, and the universality is strong.

Description

Screen detection circuit, device and display screen

Technical Field

The invention relates to the technical field of electrostatic detection, in particular to a screen detection circuit, a screen detection device and a display screen.

Background

At present, a large screen assembly (generally used in an air conditioner, a flat panel, and a Display) mainly has a screen with 4 interfaces, where the 4 interfaces are LVDS (Low-Voltage Differential Signaling), MIPI (Mobile Industry Processor Interface), EDP (Embedded Display Interface), and HDMI (High Definition Multimedia Interface), respectively. The MIPI, EDP and HDMI screens cannot be detected in a software mode because the driving chips of partial screens do not support software readback. Even if the detection is carried out in a software mode, the state of the screen driving chip can only be detected, and the detection capability of the working state of the display panel is limited; the LVDS screen has no software read-back mechanism, namely the main control circuit can not read the working state of the screen in a software mode. When the screen is interfered by an Electro-Static discharge (ESD), such as a screen splash and a screen blackout, the main control circuit cannot restart the screen and cannot recover the display.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present invention is to provide a screen detection circuit for detecting abnormal screen status caused by abnormal display panel or abnormal driver chip, which is applicable to various interface screens and has strong versatility.

The second purpose of the invention is to provide a screen detection device.

A third object of the invention is to provide a display screen.

In order to achieve the above object, an embodiment of a first aspect of the present invention provides a screen detecting circuit, including: the output interface is used for outputting a detection signal, wherein the detection signal is used for determining the working state of a screen; the detection unit is provided with an output end, a power supply end and a first detection end and/or a second detection end, the first detection end is used for being connected with a first power supply of the screen refreshing circuit, the second detection end is used for being connected with a second power supply of the screen refreshing circuit, the power supply end is connected to a preset power supply, the output end is connected with the output interface, and the detection unit is used for detecting the power supply condition of the first power supply and/or the second power supply and outputting a corresponding detection signal through the output interface.

According to the screen detection circuit provided by the embodiment of the invention, the power supply conditions of the first power supply and the second power supply of the screen refreshing circuit are detected through the detection unit, and the corresponding detection signals are output through the output interface according to the power supply conditions of the first power supply and the second power supply, so that the external circuit can determine the working state of the screen according to the detection signals, thereby realizing the detection of the screen state abnormity caused by the abnormity of the display panel or the abnormity of the driving chip, and simultaneously detecting the power supply conditions of the first power supply and the second power supply, and improving the reliability of the screen abnormity detection.

In order to achieve the above object, a second embodiment of the present invention provides a screen detecting apparatus, including: the screen detection circuit described above; and the main control circuit is connected with the output interface of the screen detection circuit and is used for determining the working state of the screen according to the detection signal output by the output interface.

According to the screen abnormity detection device disclosed by the embodiment of the invention, after the screen detection circuit outputs the detection signal, the working state of the screen can be determined according to the detection signal through the main control circuit, so that the detection of the abnormal state of the screen caused by the abnormity of the display panel or the abnormity of the driving chip can be realized.

In order to achieve the above object, a third embodiment of the present invention provides a display screen, including the above screen detecting device.

According to the display screen provided by the embodiment of the invention, the screen detection device can be used for detecting the abnormal screen state caused by the abnormal display panel or the abnormal driving chip, and the screen detection device is suitable for detecting various interface screens, so that the universality is strong.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a block diagram of a screen detection circuit according to one embodiment of the present invention;

FIG. 2 is a topology diagram of a screen detection circuit according to one embodiment of the present invention;

FIG. 3 is a block diagram of a screen detecting device according to an embodiment of the present invention;

fig. 4 is a block diagram of a display screen according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As described in the background art, currently, a large-screen component (generally used in an air conditioner, a flat panel, and a display) mainly has a screen with 4 interfaces, and the 4 interfaces are LVDS, MIPI, EDP, and HDMI interfaces, respectively. The MIPI, EDP and HDMI screens cannot be detected in a software mode due to the fact that the driving chips of the MIPI, EDP and HDMI screens do not support software readback. Even if the detection is carried out in a software mode, the state of the screen driving chip can only be detected, and the detection capability of the working state of the display panel is limited; the LVDS screen has no software read-back mechanism, namely the main control circuit can not read the working state of the screen in a software mode. When the screen is interfered by ESD and has soft failure, such as screen blooming and screen blacking, the main control circuit cannot restart the screen and cannot recover display, which is fatal to electrostatic design.

Therefore, the invention provides a detection circuit, when the screen state is abnormal due to static electricity, no matter the screen display panel is abnormal or the driving chip is abnormal, the positive and negative power supplies provided for the screen refreshing circuit can be changed, so that the positive and negative power supplies provided for the screen refreshing circuit can be detected by the screen detection circuit of the invention, and a low level signal is output, so that after the main control circuit receives the low level signal, the current state of the screen is judged to be abnormal, and the screen is restarted, so that the normal display of the screen is recovered, and the influence on a user is reduced. The screen detection circuit can realize the detection of the working state of the screen of MIPI, EDP and HDMI or other types of screens, and can detect whether the screen display panel is abnormal or the screen state is abnormal due to the abnormality of the driving chip so as to remove the soft failure of the screen.

The screen detection circuit, apparatus and display screen of the embodiment of the present invention are described below with reference to fig. 1 to 4.

As shown in fig. 1-2, the screen sensing circuit 100 may include an output interface 10 and a sensing unit 20. The output interface 10 is configured to output a detection signal, which is used to determine an operating state of the screen. The detecting unit 20 has an output terminal (not shown), a power supply terminal (not shown), and a first detecting terminal A1 and/or a second detecting terminal A2, the first detecting terminal A1 is used for connecting a first power supply VGH of the screen refresh circuit, the second detecting terminal A2 is used for connecting a second power supply VGL of the screen refresh circuit, the power supply terminal is connected to a preset power supply, the output terminal is connected to the output interface 10, the detecting unit 20 is used for detecting the power supply condition of the first power supply VGH and/or the second power supply VGL, and outputting a corresponding detecting signal through the output interface 10.

Specifically, the detection circuit of this embodiment may be applicable to screens with LVDS, MIPI, EDP, HDMI interfaces, or other screens, and VGH and VGL power supply circuits are distributed in all the interface screens. VGH and VGL in this embodiment are generated by a charge pump or a DC-DC conversion circuit inside the panel driving chip, which is used to provide a positive power supply and a negative power supply to the refresh circuit of the panel display panel. For example, VGH is used to provide a positive power supply and VGL is used to provide a negative power supply. The refresh circuit in this embodiment is distributed in the frame and the internal pixel circuit of the screen display panel. When the screen fails due to electrostatic interference, such as a black screen, a stuck screen and a patterned screen, the voltages of the positive and negative power supplies change. Therefore, the detection circuit of this embodiment can detect the positive power supply VGH and the negative power supply VGL through the A1 terminal and/or the A2 terminal, respectively, to output a detection signal according to the detected high and low levels of VGH and/or VGL, so that an external circuit such as a main control circuit obtains the current operating state of the screen according to the detection signal. In this embodiment, when the detection signal is a low level signal, it may be determined that the current operating state of the screen is an abnormal state, and when the detection signal is a high level signal, it may be determined that the current operating state of the screen is a normal state.

It should be noted that the voltage of the preset power supply in this embodiment may be an interface voltage for communication between the main control circuit and the screen, and the voltage value is generally 1.8V or 3.3V. In this embodiment, when the screen operating state is a normal state, the positive power supply VGH provided to the refresh circuit of the screen display panel is located in the first interval, and the negative power supply VGL provided to the refresh circuit of the screen display panel is located in the second interval; the lower limit value of the second interval is the opposite number of the upper limit value of the first interval, and the upper limit value of the second interval is the opposite number of the lower limit value of the first interval. For example, when the screen operating state is a normal 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 operating state is abnormal, the voltage values of VGH and VGL change and cannot be maintained in the above-mentioned interval, wherein the voltage becomes 0 when the driving chip stops operating.

In an embodiment of the present invention, as shown in fig. 2, the detecting unit 20 may include a first detecting sub-circuit, wherein the first detecting sub-circuit has a first detecting terminal A1, a first power terminal VI1 and a first output terminal P1, the first power terminal VI1 is connected to the power terminal, the first output terminal P1 is connected to the output terminal, and the first detecting sub-circuit is configured to detect a power supply condition of the first power supply VGH.

Further, as shown in fig. 2, the first detection sub-circuit may include: the circuit comprises a first resistor R1, a second resistor R2, a second switch S2 and a third switch S3, wherein the first resistor R1 and the second resistor R2 are connected between a first detection end A1 and the ground in series; the first end of the S2 is connected with the first power supply end VI1 through a third resistor R3, the control end of the S2 is connected with a node between the first resistor R1 and the second resistor R2, and the second end of the S2 is grounded; the first end of S3 links to each other with P1, and the first end of S3 still links to each other with first power supply terminal VI1 through fourth resistance R4, and the control end of S3 links to each other with the first end of S2, and the second end ground of S3.

Specifically, when the first detection sub-circuit is used for detection, whether the screen state is abnormal or not can be detected through the level state of the VGH. Specifically, when VGH is at a low level, the second switch S2 is turned off, and the voltage at the first end of the second switch S2 is pulled high, so that the third switch S3 is turned on, the voltage at the output end is pulled low, and 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 the current working state of the screen to be an abnormal state according to the low level signal. Therefore, as long as the first detection sub-circuit detects that VGH is low level, the main control circuit can determine that the screen is abnormal. In the embodiment, whether the screen is detected abnormally can be realized through the first detection sub-circuit, so that the topological structure of the screen detection circuit is effectively simplified, and the hardware cost is saved.

Optionally, the detecting unit 20 may further include a first switch S1 and a second detecting sub-circuit, wherein a first end of the first switch S1 is connected to the output end, and a second end of the first switch S1 is grounded; the second detection sub-circuit is provided with 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 with the power supply end, the second output end P2 is connected with the control end of the first switch S1, the second detection sub-circuit is used for detecting the power supply condition of the second power supply source, wherein when the working state of the screen is normal, the voltage of the first power supply source, namely VGH, is high level voltage, and the voltage of the second power supply source, namely VGL, is low level voltage.

The power supply voltages of VI2 and VI1 are the same, and are both interface voltages for communication between the main control circuit and the screen, and the voltage value is generally 1.8V or 3.3V.

Further, as shown in fig. 2, 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; the first end of the S4 is connected with the second power supply end VI2 through a seventh resistor R7, the control end of the S4 is connected with a node between the R5 and the R6, and the second end of the S4 is connected with the A2 end; the first end of S5 is connected with the second output end P2, the first end of S5 is also connected with the second power supply end VI2 through an eighth resistor R8, the control end of S5 is connected with the first end of S4, and the second end of S5 is grounded.

The first to fifth switches are at least one of NMOS tube, triode, switch IC and programmable gate array.

Specifically, the detecting unit 20 may only include the first switch S1 and the second detecting sub-circuit, wherein the VGL may be detected through the detecting terminal A2, and a high-low level signal is output through the output interface 10 according to a variation of the VGL, so that the external circuit can determine the current operating state of the screen according to the high-low level signal.

For example, when VGL is at a high level, the fourth switch S4 is turned on, the voltage at the first end of the fourth switch S4 is pulled low, the fifth switch S5 is turned off, the voltage at the second output end P2 is pulled high, and the first switch S1 is turned on, so that the voltage at the output end is pulled low, and 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 the current working state of the screen to be an abnormal state according to the low level signal. Therefore, as long as the second detection sub-circuit detects that VGL is high level, the main control circuit can determine that the screen is abnormal. In the embodiment, whether the screen is detected abnormally can be realized through the second detection sub-circuit, so that the topological structure of the screen detection circuit is effectively simplified, and the hardware cost is saved.

Certainly, in order to make the abnormality detection of the screen more comprehensive, if the abnormality of the positioning screen is influenced by positive electrostatic interference, negative electrostatic interference or abnormality of the driving chip of the screen, VGH and VGL can be detected through the detection terminal A1 and the detection terminal A2 respectively, and high and low level signals are output through the output interface 10 according to the variation condition of VGH and VGL, so that the external circuit can judge the current working state of the screen according to the high and low level signals. Namely, whether the screen is abnormal or not is detected by the first detection sub-circuit and the second detection sub-circuit at the same time, and the specific reason of the screen abnormality is detected.

As described above, when the operating state of the screen is normal, 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.

Specifically, the high and low level voltages of VGH and VGL in this embodiment correspond to the state of the screen. Specifically, when the screen display is normal, the voltage of the VGH is in a first range, i.e., a normal range of 9 to 15v, and the voltage of the VGL is in a second range, i.e., a normal range of-15 to-9V, i.e., the VGH is at a high level and the VGL is at a low level. As shown in table 1, when the screen display is normal, VGH is high, VGL is low, S2 is turned on, the voltage at the first end of S2 is pulled low, S3 is turned off, then R3 and R5 are adjusted to appropriate resistors, so that S4 is turned off, the first end of S4 is pulled high and pulled up to VI2, S5 is turned on, the output end P2 is pulled low, S1 is turned off, and when S1 and S3 are turned off, the output end is pulled high to VI1, and the output interface 10 outputs a high level signal. When the main control circuit detects a high level signal output from the output interface 10, it is 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, the screen can be determined to be in a normal state.

TABLE 1

When the working state of the screen is an abnormal state, the VGH and the VGL can be detected through the detection end A1 in the first detection sub-circuit and the detection end A2 in the second detection sub-circuit respectively, so as to locate the specific reason causing the screen abnormality according to the VGH and the VGL, wherein the VGH and the VGL have the following three states:

(1) VGH is larger than a first voltage preset value, VGL is larger than a second voltage preset value, wherein the first voltage preset value is larger than or equal to the lower limit value of a first interval, the second voltage preset value is larger than the upper limit value of a second interval, the first interval is 9-15V, and the second interval is-15V to-9V. For example, VGH is larger than 9V, VGL is larger than-8V, namely VGH is high level, VGL is high level, at this time, it indicates that the screen is subjected to positive electrostatic interference, and the screen will display abnormal. Specifically, when VGH and VGL are both at a high level, S2 is turned on, the first end of S2 is pulled down, S3 is turned off, and then R3 and R5 are adjusted to appropriate resistors, so that when VGL is high, S4 is turned on, the first end of S4 is pulled down, S5 is turned off, the output end P2 is pulled up, S1 is turned on, and the output interface 10 outputs a low level signal. Therefore, when the output interface 10 is detected to output a low level signal, the screen abnormality can be determined, and then when the first detection sub-circuit and the second detection sub-circuit respectively detect that VGH and VGL are both at a high level, the screen abnormality can be further determined to be caused by the positive electrostatic interference on the screen.

(2) VGH is smaller than a third voltage preset value, VGL is smaller than a fourth voltage preset value, wherein the third voltage preset value is smaller than a lower limit value of the first interval, and the fourth voltage preset value is smaller than or equal to an upper limit value of the second interval. For example, VGH is less than 8V, VGL is less than-9V, i.e., VGH is low, VGL is low, and this indicates that the screen is subjected to negative electrostatic interference, and the screen may display an abnormality. When VGH and VGL are both at a low level, the resistors R1 and R2 may be adjusted to appropriate resistors, so that S2 is turned off, the first end of S2 is pulled up to VI1, S3 is turned on, the output terminal P1 is pulled down, 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, and then when it is detected that VGH and VGL are at the same low level through the first detection sub-circuit and the second detection sub-circuit, respectively, it can be further determined that the reason for the screen abnormality is that the screen is subjected to negative electrostatic interference.

(3) VGH is less than the third voltage preset value, VGL is greater than the second voltage preset value. The third voltage preset value is smaller than the lower limit value of the first interval, the second voltage preset value is larger than the upper limit value of the second interval, for example, VGH is smaller than 8v, VGL is larger than-8V, namely VGH is low level, VGL is high level, which indicates that the driving chip of the screen does not work, and the display screen is abnormal. When VGH is at a low level, S2 is turned off, the first end of S2 is pulled up to VI1, S3 is turned on, the output end P1 is pulled down, and the output interface 10 outputs a low level signal. Therefore, when the output interface 10 is detected to output a low level signal, the screen abnormality can be determined, and then when the first detection sub-circuit and the second detection sub-circuit respectively detect that VGH is at a low level and VGL is at a high level, the cause of the screen abnormality can be further determined to be the abnormality of the driving chip of the screen.

In this embodiment, when the output interface 10 outputs a low level signal, it can be determined that the screen operating state is abnormal, and when the output interface 10 outputs a high level signal, it can be determined that the screen operating state is normal. Further, when the abnormal screen operating state is determined, the reason for the abnormal screen display can be further analyzed according to the VGH and VGL level states detected by the A1 terminal and the A2 terminal. For example, when it is detected that both VGH and VGL are at a high level, it can be determined that the screen is subjected to positive electrostatic interference, when it is detected that both VGH and VGL are at a low level, it can be determined that the screen is subjected to negative electrostatic interference, and when it is detected that both VGH and VGL are at a low level and VGL is at a high level, it can be determined that the driver chip of the screen is abnormal. Therefore, the screen detection circuit in this embodiment can detect VGH and VGL simultaneously through the first detection sub-circuit and the second detection sub-circuit, and detect the abnormal state of the screen according to the specific states of VGH and VGL, so as to locate the specific reason of the abnormal state of the screen.

Optionally, the output interface 10 may be connected to an external circuit, such as a break port of a main control circuit or a general-purpose input/output port, so that the main control circuit determines whether the screen operates abnormally according to the received high-low level signal, and resets or restarts the screen when it is determined that the operating state of the screen is abnormal, so as to relieve the soft failure of the screen. When a hard failure occurs on the screen, the detection circuit can also detect the hard failure to remove the hard failure and upload a log.

Furthermore, the VGH or VGL has an external capacitor on the printed circuit board of the screen, so the detection circuit does not need to modify the driving chip of the screen display panel and the display panel. The detection circuit is added on a printed circuit board of the screen or a main board where the main control circuit is located, the realization is convenient, the modification period is short, and therefore the problems of long period and high risk of modifying a driving chip and a display panel of the screen display panel are effectively avoided.

As described above, the VGH or VGL power supply circuits are distributed on all interface screens, and the functions are basically the same, namely no matter the LVDS/MIPI/HDMI/DP interface screens or other interface screens, the detection circuit can be used, the universality is strong, and the detection circuit can simultaneously detect 2 paths of power supplies of the VGH/VGL, so that the abnormal detection of the screens is more comprehensive, and the detection is more comprehensive and reliable compared with a common software read-back mechanism.

In summary, in the screen detection circuit according to the embodiment of the invention, the detection unit detects the power supply conditions of the first power supply and the second power supply of the screen refresh circuit, and outputs the corresponding detection signal through the output interface according to the power supply conditions of the first power supply and the second power supply, so that the external circuit can determine the working state of the screen according to the detection signal, thereby detecting the screen state abnormality caused by the display panel abnormality or the driving chip abnormality, and detecting the power supply conditions of the first power supply and the second power supply at the same time, thereby improving the reliability of the screen abnormality detection.

In order to achieve the above object, the present invention further provides a screen detecting device 1000, as shown in fig. 3, the screen detecting device 1000 may include the screen detecting 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 configured to determine the working state of the screen according to the detection signal output by the output interface 10.

Specifically, the output interface 10 may be connected to a middle break port or a general purpose input/output port of the main control circuit 200, so that the main control circuit 200 determines whether the screen works abnormally according to the received high/low level signal, and resets or restarts the screen when it is determined that the working state of the screen is abnormal.

In an embodiment of the present invention, the main control circuit 200 may specifically be configured to: when the detection signal is at a high level, determining that the working state of the screen is normal; and when the detection signal is at a low level, determining that the working state of the screen is abnormal.

According to the screen abnormity detection device disclosed by the embodiment of the invention, after the screen detection circuit outputs the detection signal, the working state of the screen can be determined according to the detection signal through the main control circuit, so that the detection of the abnormal state of the screen caused by the abnormity of the display panel or the abnormity of the driving chip can be realized.

In order to achieve the above purpose, the present invention further provides a display screen 10000, as shown in fig. 4, further comprising the above screen detecting apparatus 1000.

According to the display screen provided by the embodiment of the invention, the screen detection device can be used for detecting the abnormal state of the screen caused by the abnormity of the display panel or the abnormity of the driving chip, and the screen detection device is suitable for detecting various interface screens, so that the universality is high.

It should be noted that the logic and/or steps represented or otherwise described herein, e.g., as a sequential list of executable instructions that may be considered to implement logical functions, may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may 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 an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.

In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may 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 may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. 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, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), among others.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus, the electronic device, and the computer-readable storage medium embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and in relation to the description, reference may be made to some portions of the description of the method embodiments.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. A screen detection circuit, comprising:

the output interface is used for outputting a detection signal, wherein the detection signal is used for determining the working state of a screen;

the detection unit is provided with an output end, a power supply end and a first detection end and/or a second detection end, the first detection end is used for being connected with a first power supply of the screen refreshing circuit, the second detection end is used for being connected with a second power supply of the screen refreshing circuit, the power supply end is connected to a preset power supply, the output end is connected with the output interface, and the detection unit is used for detecting the power supply condition of the first power supply and/or the second power supply and outputting a corresponding detection signal through the output interface.

2. The screen detecting circuit of claim 1, wherein the detecting unit comprises:

the first detection sub-circuit is provided with the first detection end, a first power supply end and a first output end, the first power supply end is connected with the power supply end, the first output end is connected with the output end, and the first detection sub-circuit is used for detecting the power supply condition of the first power supply.

3. The screen detect circuit of claim 2, wherein the first detection subcircuit comprises:

a first resistor and a second resistor connected in series between the first detection terminal and ground;

a first end of the second switch is connected with the first power supply end through a third resistor, a control end of the second switch is connected with a node between the first resistor and the second resistor, and a second end of the second switch is grounded;

and the first end of the third switch is connected with the first output end, the first end of the third switch is also connected with the first power supply end through a fourth resistor, the control end of the third switch is connected with the first end of the second switch, and the second end of the third switch is grounded.

4. The screen detecting circuit of claim 1 or 3, wherein the detecting unit comprises:

a first switch, a first end of which is connected with the output end, and a second end of which is grounded;

the second detection sub-circuit is provided with a second detection end, a second power supply end and a second output end, the second power supply end is connected with the power supply end, the second output end is connected with the control end of the first switch, and the second detection sub-circuit is used for detecting the power supply condition of the second power supply source; when the working state of the screen is normal, the voltage of the first power supply is high level voltage, and the voltage of the second power supply is low level voltage.

5. The screen detection circuit of claim 4, wherein the second detection subcircuit comprises:

a fifth resistor and a sixth resistor connected in series between the second supply terminal and the second detection terminal;

a first end of the fourth switch is connected with the second power supply end through a seventh resistor, a control end of the fourth switch is connected with a node between the fifth resistor and the sixth resistor, and a second end of the fourth switch is connected with the second detection end;

and the first end of the fifth switch is connected with the second output end, the first end of the fifth switch is also connected with the second power supply end through an eighth resistor, the control end of the fifth switch is connected with the first end of the fourth switch, and the second end of the fifth switch is grounded.

6. The screen detecting circuit according to claim 5, wherein the first to fifth switches are at least one of NMOS transistor, triode, switch IC, and programmable gate array.

7. A screen detecting apparatus, comprising:

the screen detection circuit of any one of claims 1-6;

and the main control circuit is connected with the output interface of the screen detection circuit and is used for determining the working state of the screen according to the detection signal output by the output interface.

8. The screen detecting device of claim 7, wherein the main control circuit is specifically configured to:

when the detection signal is at a high level, determining that the working state of the screen is normal;

and when the detection signal is at a low level, determining that the working state of the screen is abnormal.

9. The screen detecting device of claim 7, wherein the main control circuit, when determining that the operating state of the screen is abnormal, is further configured to:

and carrying out reset or restart control on the screen.

10. A display screen comprising the screen detecting device according to claim 9.

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