Driving circuit of display screen and display screen system

Abstract

The invention discloses a display screen driving circuit and a display screen system, and the driving circuit comprises a statistical circuit which is used for carrying out the statistics of the use information of a display screen; the comparison circuit is electrically connected with the statistical circuit and is used for comparing the use information with a preset condition and outputting a judgment signal when the use information reaches the preset condition; the verification circuit is used for acquiring the client secret key and a preset secret key, verifying the client secret key according to the preset secret key and outputting a verification result; and the control circuit is electrically connected with the comparison circuit and the verification circuit and is used for controlling the output enabling of the driving circuit according to the verification result and the judgment signal. Whether the output of the driving circuit is enabled or not is controlled according to whether the display screen is full of the trial period or not and the verification result of the client key and the preset key, and the problem that the client can still normally use the display screen without paying the tail money when the trial period is full can be avoided.

Description

Technical Field

[0001] The present invention relates to the field of display screens, and in particular to a display screen driving circuit and a display screen system. Background Art

[0002] With the development of science and technology, electronic devices with display functions emerge in an endless stream, especially large-size LED display screens, which are widely used in road entrances and exits, public parking lots and other places due to their advantages such as high brightness, high reliability and simple installation.

[0003] After the display manufacturer has debugged the display and handed it over to the customer, the customer usually pays a deposit in advance and pays the balance after using it for a period of time without any problems. However, if the customer does not pay the balance and the display can still be used normally, it will be difficult for the manufacturer to collect the balance. Summary of the invention

[0004] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0005] In view of the existing problems, an embodiment of the present invention provides a driving circuit of a display screen, including:

[0006] A statistical circuit, used for collecting statistics of usage information of the display screen;

[0007] A comparison circuit, electrically connected to the statistical circuit, for comparing the usage information with a preset condition and outputting a judgment signal indicating whether the driving circuit has been used for the full trial period according to the comparison result;

[0008] A verification circuit, used to obtain a client key and a preset key, verify the client key according to the preset key, and output a verification result;

[0009] The control circuit is electrically connected to the comparison circuit and the verification circuit respectively, and is used to control whether the drive circuit outputs a signal according to the verification result and the judgment signal.

[0010] In some embodiments, the control circuit is further configured to:

[0011] After the trial period of the driving circuit expires, the output of the driving circuit is turned off, and after the customer key verification is passed, the output of the driving circuit is restored;

[0012] or,

[0013] After the trial period of the driving circuit expires, the output of the driving circuit is turned off only when the customer key verification fails or the customer key is not verified within a timeout period.

[0014] In some embodiments, the control circuit is further configured to:

[0015] Before the trial period of the driving circuit expires, if the customer key verification is passed, the statistical circuit and / or the comparison circuit and / or the verification circuit are controlled to stop working.

[0016] In some embodiments, the control circuit is further configured to:

[0017] Before the trial period of the driving circuit expires, if the customer key verification fails, the output of the driving circuit is turned off.

[0018] In some embodiments, the control circuit is further configured to:

[0019] If the customer key verification fails before the trial period of the driving circuit expires, the output of the driving circuit is turned off after the trial period expires.

[0020] In some embodiments, the statistical circuit includes a usage duration statistical circuit and / or a usage times statistical circuit;

[0021] The usage time counting circuit is used to count the usage time of the display screen;

[0022] The usage count circuit is used to count the usage times of the display screen;

[0023] The usage information includes the usage duration and / or the number of uses; the driving circuit having completed the trial period means that at least one of the following conditions is met: the usage duration reaches the preset duration, and the number of uses reaches the preset number of times.

[0024] In some embodiments, the usage duration statistics circuit includes:

[0025] The protocol analysis circuit is used to receive the display-related data sent by the control card to the drive circuit and analyze the periodic signal therefrom;

[0026] The usage duration counting circuit is used to count the periodic signal and update the usage duration according to the counting situation.

[0027] In some embodiments, the periodic signal includes any one of a frame change signal, a line change signal, a latch signal, and a clock signal.

[0028] In some embodiments, the usage count circuit includes:

[0029] A power-on reset circuit, used to generate a reset signal when power is turned on;

[0030] The usage count circuit is used to update the usage count after receiving the reset signal.

[0031] Another aspect of the present invention provides a display screen system, including a control card, a display screen, and the driving circuit as described above; wherein:

[0032] The display screen includes a plurality of lamp beads arranged in an array, and the control card is used to send display-related data to the drive circuit;

[0033] The driving circuit is connected between the control card and the constant current driving circuit, and is used to receive display-related data sent by the control card and output it to the constant current driving circuit;

[0034] The constant current driving circuit lights up the lamp beads of the display screen according to display-related data.

[0035] The driving circuit and display screen system provided by the present invention controls whether the output of the driving circuit is enabled according to whether the use period has expired and the verification result of the customer key and the preset key. This can avoid the problem that the customer can still use the display screen normally when the trial period expires but has not paid the balance, and helps the manufacturer to recover the balance. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following drawings of the present invention are used to understand the present invention as part of the present invention. The embodiments of the present invention are shown in the drawings and the description thereof is used to explain the principle of the present invention.

[0037] In the attached figure:

[0038] Figure 1 A schematic block diagram of a driving circuit according to an embodiment of the present invention is shown;

[0039] Figure 2 A schematic block diagram of a display screen system according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present invention more obvious, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present invention.

[0041] The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

[0042] The embodiment of the present invention provides a display screen driving circuit and display screen system, which controls whether the output of the driving circuit is enabled according to a judgment signal indicating whether the trial period has expired and the verification result of the customer key and the preset key, thereby avoiding the problem that the customer can still use the display screen normally when the trial period expires without paying the balance, and helps manufacturers to collect the balance. Figure 1 and Figure 2 , Figure 1 A schematic diagram of a module of an implementation scheme of a display screen driving circuit provided by an embodiment of the present invention. Figure 2 A schematic diagram of modules of an implementation scheme of a display screen system provided by an embodiment of the present invention.

[0043] like Figure 1 As shown, the present invention provides a driving circuit 100 for a display screen, including: a statistical circuit 110, used for counting usage information of the display screen; a comparison circuit 120, electrically connected to the statistical circuit 110, used for comparing the usage information with a preset condition, and outputting a judgment signal indicating whether the driving circuit (or display screen) has been used for the full trial period according to the comparison result; a verification circuit 130, used for obtaining a customer key and a preset key, verifying the customer key according to the preset key, and outputting a verification result; a control circuit 140, electrically connected to the comparison circuit 120 and the verification circuit 130, respectively, for controlling whether the driving circuit 100 outputs a signal according to the verification result of the verification circuit 130 and the judgment signal output by the comparison circuit 120.

[0044] The driving circuit 100 may be a bus driving circuit, which is used as a buffer for the display screen and the control card, and can improve the driving capability of the signal. Figure 2As shown, in the display screen system 200, the driving circuit 100 (bus driving circuit) is connected between the control card 210 of the display screen and the constant current driving circuit 220 (constant current driving circuit or column driving circuit), and is used to receive the display-related data sent by the control card 210 and output it to the constant current driving circuit 220. The constant current driving circuit 220 is used to light up the LED lamp beads according to the display-related data. Exemplarily, the driving circuit 100 is connected to M constant current driving circuits 220; further, M constant current driving circuits 220 are connected to the circuit back end of the driving circuit 100 in a cascade form. Among them, the constant current driving circuit 220 can be a constant current driving circuit for outputting a constant current according to the image data to light up the LED lamp beads; or, the constant current driving circuit 220 can also be a driving circuit that integrates rows (row drive) and columns (column drive, that is, constant current drive). Of course, the driving circuit 100 can also be a constant current driving circuit, a row driving circuit, or a driving circuit that integrates rows and columns. The following description of the application takes the driving circuit 100 as a bus driving circuit.

[0045] Since the clock signal and other display-related data sent by the control card 210 to the constant current drive circuit 220 are broadcast, when the number of constant current drive circuits 220 on the display system is large, the load of the clock signal is heavy, and there is only one clock signal input by the control card 210, at this time, the drive circuit 100 can be used to convert the clock and other broadcast signals 1 to N to improve the driving ability of the broadcast signal. When the output enable of the drive circuit 100 is turned off (that is, the drive circuit does not output a signal), the display-related data sent by the control card 210 to the drive circuit 100 will not be forwarded to the constant current drive circuit 220, so the embodiment of the present invention determines whether the display screen can be used normally by controlling the output enable of the drive circuit 100.

[0046] In some embodiments, the driving circuit 100 further includes a data acquisition circuit for acquiring display-related data from the control card 210. The display-related data includes image data, such as grayscale data. The grayscale data corresponds to the time when the LED lamp beads are lit, and the time when the lamp beads are lit determines the brightness of the lamp beads.

[0047] The driving circuit 100 includes a statistical circuit 110 for counting usage information of the display screen 230. Exemplarily, the usage information includes the usage time and / or the number of times the display screen 230 (which can also be considered as the driving circuit 100) is used, and the statistical circuit 110 includes a usage time statistical circuit 111 and / or a usage number statistical circuit 112, wherein the usage time statistical circuit 111 is used to count the usage time of the display screen, and the usage number statistical circuit 112 is used to count the number of times the display screen is used. Among them, the full trial period of the driving circuit 100 refers to satisfying at least one of the following conditions: the usage time reaches a preset time, and the number of times the usage reaches a preset number of times.

[0048] Exemplarily, the usage time statistics circuit 111 includes: a protocol parsing circuit, which is used to receive display-related data sent by the control card 210 to the constant current driving circuit 220, and parse out periodic signals therefrom; and a usage time counting circuit, which is used to count periodic signals and update the usage time according to the counting situation.

[0049] Exemplarily, when the count value of counting the periodic signal reaches a preset number, the usage time stored in the memory 150 is updated. The memory 150 may be a non-volatile memory. The memory 150 may be external to the drive circuit 100, or encapsulated in the drive circuit 100.

[0050] Among them, a periodic signal refers to a signal that recurs at a certain time interval, and this repeated time interval is the time period of the signal. Exemplarily, the periodic signal parsed from the display-related data includes any one of a frame change signal, a line break signal, a latch signal, and a clock signal. Since the periodic signal is periodic in time, the use time of the display screen can be determined according to the number of periodic signals and the period of the periodic signal. Based on this, the use time counting circuit 111 calculates the use time of the display screen 230 by counting the periodic signal. When the count value of the periodic signal reaches a preset number, the statistical circuit 110 reads the previous use time of the display from a specific address in the memory 150, adds the time corresponding to the preset number to the previous use time to obtain the current use time, and writes the current use time into the memory 150 to complete the update of the use time stored in the memory 150.

[0051] It should be noted that the unit of the usage duration stored in the memory 150 may be time (in seconds or milliseconds, etc.). Assuming that the periodic signal is counted 10 times, it means that the duration has increased by 2 seconds. If the data originally stored in the memory 150 is 10 seconds, when the periodic signal is counted 10 times, the data stored in the memory 150 is updated from 10 seconds to 12 seconds.

[0052] The unit of the usage duration stored in the memory 150 may also be a number, which is the number of times the usage duration is updated, which is different from the number of periodic signals. For example, assuming that the periodic signal is counted 10 times, it means that the duration has increased by 2 seconds. If the data originally stored in the memory 150 is 5, indicating that the previous usage duration of the display screen is 5*2=10 seconds, then when the periodic signal is counted 10 times, the usage duration stored in the memory 150 is updated to 6, indicating that the current usage duration of the display screen is 6*2=12 seconds.

[0053] The usage count counted by the usage count counting circuit 112 includes the number of times the display screen 230 is powered on. Exemplarily, the usage count counting circuit 112 includes: a power-on reset circuit, which is used to generate a reset signal when powered on; and a usage count counting circuit, which is used to update the usage count (stored in the memory 150) after receiving the reset signal. Specifically, the usage count circuit 112 reads the previous usage count of the display screen from a specific address of the memory 150, adds 1 to the previous usage count, and writes it to the specific address of the memory 150 to replace the previous usage count. For example, the number of usages originally stored in the memory 150 is 10 times. When the usage count circuit receives the reset signal, the number of usages stored in the memory 150 is updated to 11 times.

[0054] In some embodiments, the driving circuit 100 further includes a memory read / write circuit 160. The statistical circuit 110 reads the previous usage information stored in the memory 150 through the memory read / write circuit 160, and writes the current usage information into the memory 150 through the memory read / write circuit 160 after updating. Specifically, when the statistical circuit 110 includes a usage duration statistical circuit 111, the memory read / write circuit 160 is respectively connected to the usage duration counting circuit 111 and the memory 150, the usage duration counting circuit 111 reads the previous usage duration in the memory 150 through the memory read / write circuit 160, and writes the current usage duration into the memory 150 through the memory read / write circuit 160. When the statistical circuit 110 includes a usage count statistical circuit 112, the memory read / write circuit 160 is respectively connected to the usage count circuit 112 and the memory 150, the usage count circuit 112 reads the previous usage count in the memory 150 through the memory read / write circuit 160, and writes the current usage count into the memory 150 through the memory read / write circuit 160.

[0055] The comparison circuit 120 is electrically connected to the statistical circuit 110, and is used to compare the usage information with the preset conditions after receiving the usage information output by the statistical circuit 110, and output a judgment signal indicating whether the driving circuit (or display screen) has been used for the full trial period according to the comparison result.

[0056] Exemplarily, when the usage information reaches a preset condition, a trial expiration signal is output. For example, the judgment signal output is 1, indicating that the trial expiration has occurred.

[0057] The usage information reaches the preset condition / the driving circuit has reached the full trial period, which means that at least one of the following conditions is met: the usage time reaches the preset time, and the number of times of use reaches the preset number of times. If the statistical circuit 110 only includes the usage time statistical circuit 111, then when the usage time reaches the preset time, the statistical circuit 110 outputs a trial expiration signal, for example, the judgment signal output is 1. If the statistical circuit 110 only includes the usage time and number of times circuit 112, then when the number of times of use reaches the preset number of times, the statistical circuit 110 outputs a trial expiration signal, for example, the judgment signal output is 1. If the statistical circuit 110 includes both the usage time statistical circuit 111 and the usage number statistical circuit 112, any one of the following methods can be used: when any one of the conditions of the usage time reaching the preset time and the number of times of use reaching the preset number of times is met, the comparison circuit 120 outputs a trial expiration signal; or, when both the usage time reaching the preset time and the number of times of use reaching the preset number of times are met, the comparison circuit 120 outputs a trial expiration signal.

[0058] Exemplarily, the comparison circuit 120 is electrically connected to the memory 150 through the memory read / write circuit 160, so that the preset conditions (preset duration and / or preset number of times) stored in the memory 150 are read through the memory read / write circuit 160. The comparison circuit 120 can read the current usage information from the memory 150, the statistical circuit 110 updates the data in the memory 150 as the current usage information after statistics, and the comparison circuit 120 reads the current usage information from the memory 150; or, the comparison circuit 120 can also directly obtain the current usage information from the memory read / write circuit 160.

[0059] Exemplarily, the driving circuit 100 may further include a condition preset circuit 170. The condition preset circuit 170 is electrically connected to the comparison circuit 120 and is used to set a preset condition (preset duration and / or preset number of times).

[0060] The verification circuit 130 is used to obtain the customer key and the preset key, verify the customer key according to the preset key, and output the verification result. The preset key can be a string pre-stored in the display screen system 200 when it leaves the factory, and can specifically include numbers, letters, Chinese characters, symbols, etc. The customer key is the string input by the customer. After the customer pays the balance, the factory or seller of the display screen system 200 will give the customer the customer key.

[0061] Verifying the client key according to the preset key may include comparing the preset key with the client key to determine whether the two are consistent, if the two are consistent, outputting a verification result indicating that the verification is passed, and if the two are inconsistent, outputting a verification result indicating that the verification fails. The verification circuit 130 may use any feasible key verification method to verify whether the client key matches the preset key, such as performing a certain operation on the client key and the preset key and then comparing the operation results to see whether they are consistent.

[0062] Exemplarily, the verification circuit 130 can read the customer key and the preset key stored in the memory 150 through the memory read / write circuit 160. The preset key is pre-stored in the memory 150 before leaving the factory, and the customer key is stored in the memory 150 after being input by the customer. The customer can input the customer key after the trial period expires, and the display screen system 200 can provide the customer with an interface for inputting the customer key in response to the trial expiration signal (the judgment signal is 1); or, the display screen system 200 can also receive the customer key actively input by the customer before the trial period expires.

[0063] Exemplarily, the control circuit 140 is configured as follows:

[0064] After the trial period of the driving circuit 100 (or display screen) expires, the output of the driving circuit 100 is turned off, and after the customer key verification is passed, the output of the driving circuit 100 is restored;

[0065] That is, after receiving the signal indicating the trial period has expired, the driving circuit 100 of this embodiment will respond to the signal and shut down the output of the driving circuit 100, preventing the driving circuit 100 from outputting signals, thereby preventing the display screen from continuing to display. After the user enters the secret key and passes the verification, the display screen can continue to display normally.

[0066] Exemplarily, the control circuit 140 is configured to shut down the output of the driving circuit only when the trial period of the driving circuit 100 (or display screen) expires and the customer key verification fails or the customer key is not verified within a timeout period.

[0067] In this embodiment, the output of the driving circuit 100 is not directly turned off after the trial period expires, that is, the display screen can still display. However, if the customer key verification is still not detected within a preset time (such as half an hour) after the trial period expires, the output of the driving circuit 100 will be turned off. Alternatively, after the trial period expires, if the customer key verification fails, the output of the driving circuit 100 will be turned off.

[0068] Exemplarily, the control circuit 140 is further configured to:

[0069] Before the trial period of the driving circuit 100 expires, if the customer key verification is passed, the statistical circuit 110 and / or the comparison circuit 120 and / or the verification circuit 130 are controlled to stop working.

[0070] In this application, the user can proactively perform key verification in advance. If the verification is successful, there is no need to perform statistics, verification, and judgment later. Therefore, the statistics circuit 110 and / or the comparison circuit 120 and / or the verification circuit 130 can be turned off to save system power consumption.

[0071] Exemplarily, the control circuit 140 is further configured to:

[0072] Before the trial period of the driving circuit 100 expires, if the customer key verification fails, the output of the driving circuit 100 is turned off, or, after the trial period expires, the output of the driving circuit 100 is turned off.

[0073] That is to say, if the secret key verification fails, the output can be directly closed even if the trial period has not expired; of course, you can also choose to give the customer a certain amount of time and then close it after the trial period expires.

[0074] The control circuit 140 is electrically connected to the comparison circuit 120 and the verification circuit 130, respectively, and is used to control the output enable of the drive circuit 100 according to the verification result of the verification circuit 130 and the judgment signal output by the comparison circuit 120. When the output enable of the drive circuit 100 is turned off, the drive circuit 100 no longer outputs the display-related data sent by the control card 210 to the constant current drive circuit 220, so that the display screen 230 no longer displays an image, and the customer needs to pay the balance to obtain the correct customer key, so as to use the display screen 230 normally again, thereby avoiding the problem that the display screen 230 can still be used normally after the trial period expires, making the customer unwilling to pay the balance.

[0075] The above exemplary shows the driving circuit 100 for the display screen system 200 according to the embodiment of the present invention. Based on the above description, the driving circuit 100 for the display screen system 200 according to the embodiment of the present invention controls the output enable of the driving circuit 100 according to the use expiration signal and the verification result of the customer key and the preset key, which can avoid the problem that the customer can still use the display screen normally when the trial period expires without paying the balance, which is helpful for the manufacturer to collect the balance.

[0076] Another aspect of the present invention provides a display screen system. Figure 2 Give a description. Figure 2 A schematic structural block diagram of a display screen system 200 according to an embodiment of the present invention is shown.

[0077] like Figure 2As shown, the display screen system 200 includes a control card 210, a constant current drive circuit 220, a display screen 230 and a drive circuit 100; wherein the display screen 230 includes a plurality of lamp beads arranged in an array, the control card 210 is used to send display-related data to the constant current drive circuit 220, and the constant current drive circuit 220 lights up the lamp beads of the display screen 230 according to the display-related data; the drive circuit 100 is connected between the control card 210 and the constant current drive circuit 220, and is used to receive the display-related data sent by the control card 210 and output it to the constant current drive circuit 220.

[0078] In this embodiment, the driving circuit 100, as described above, includes a statistical circuit 110, a comparison circuit 120, a verification circuit 130, and a control circuit 140, etc., which are used to control the output enable of the driving circuit 100 according to the verification result and the judgment signal between the customer key and the preset key. The function and structure of the driving circuit 100 can be found above and will not be described in detail here.

[0079] The constant current driving circuit 220 is used to output a constant current according to the image data to light up the LED lamp beads. The display screen system 200 may also include multiple row driving circuits. Taking the common anode display screen as an example, the row driving circuit includes multiple row channels, each channel is connected to the anode of a row of lamp beads, and the column driving circuit includes multiple constant current output channels, each channel is connected to the cathode of a column of lamp beads. The display method is row by row display. Specifically, for example, the first row is displayed first, then the row driving circuit supplies power to the anode of the first row of lamp beads through the first channel, and the other rows are not powered, and then the column driving circuit provides a constant current to the column where the first row of lamp beads is located through the channel, so that the first row of lamp beads is lit. The duration of the current supply is determined according to the received grayscale data, thereby determining the lighting time. Then, the second row of lamp beads is lit in the same way. The control card 210 sends display-related data such as grayscale data and configuration data to the constant current driving circuit through the driving circuit 100; the constant current driving circuit determines whether to light up the lamp beads according to the received data. When the driving circuit 100 turns off the output enable, the constant current driving single channel cannot receive display-related data, and thus the lamp beads of the display screen 230 will not be lit.

[0080] Alternatively, the constant current driving circuit 220 may also be a driving circuit that integrates rows (row drive) and columns (column drive, i.e., constant current drive). The driving circuit that integrates rows and columns, i.e., the functions of the row driving circuit and the column driving circuit are unified in one circuit or chip, which can save costs and facilitate miniaturization of the device compared to the situation where the row driving circuit and the column driving circuit are independent of each other.

[0081] Based on the above description, the display screen system 200 according to the embodiment of the present invention controls the output enable of the driving circuit 100 according to the expiration signal and the verification result of the customer key and the preset key, which can avoid the problem that the customer can still use the display screen normally when the trial period expires without paying the balance, and helps the manufacturer to recover the balance.

[0082] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present invention thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as required by the appended claims.

[0083] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0084] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed.

[0085] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0086] Similarly, it should be understood that in order to streamline the present invention and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present invention should not be interpreted as reflecting the following intention: the claimed invention requires more features than the features explicitly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby expressly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present invention.

[0087] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0088] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0089] The various component embodiments of the present invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or digital signal processor (DSP) may be used in practice to implement some or all of the functions of some modules in the article analysis device according to an embodiment of the present invention. The present invention may also be implemented as a device program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program implementing the present invention may be stored on a computer-readable medium, or may be in the form of one or more signals. Such a signal may be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0090] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0091] The above is only a specific embodiment or description of a specific embodiment of the present invention, and the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A driving circuit for a display screen, characterized in that: include: A statistical circuit, used for collecting statistics of usage information of the display screen; A comparison circuit, electrically connected to the statistical circuit, for comparing the usage information with a preset condition and outputting a judgment signal indicating whether the driving circuit has been used for a full trial period according to the comparison result; A verification circuit, used to obtain a client key and a preset key, verify the client key according to the preset key, and output a verification result; The control circuit is electrically connected to the comparison circuit and the verification circuit respectively, and is used to control whether the drive circuit outputs a signal according to the verification result and the judgment signal.

2. The driving circuit according to claim 1, characterized in that: The control circuit is further configured to: After the trial period of the driving circuit expires, the output of the driving circuit is turned off, and after the customer key verification is passed, the output of the driving circuit is restored; or, After the trial period of the driving circuit expires, the output of the driving circuit is turned off only when the customer key verification fails or the customer key is not verified within a timeout period.

3. The driving circuit according to claim 1, wherein: The control circuit is further configured to: Before the trial period of the driving circuit expires, if the customer key verification is passed, the statistical circuit and / or the comparison circuit and / or the verification circuit are controlled to stop working.

4. The driving circuit according to claim 1, wherein: The control circuit is further configured to: Before the trial period of the driving circuit expires, if the customer key verification fails, the output of the driving circuit is turned off.

5. The driving circuit according to claim 1, characterized in that: The control circuit is further configured to: If the customer key verification fails before the trial period of the driving circuit expires, the output of the driving circuit is turned off after the trial period expires.

6. The driving circuit according to any one of claims 1 to 5, characterized in that: The statistical circuit includes a usage duration statistical circuit and / or a usage times statistical circuit; The usage time counting circuit is used to count the usage time of the display screen; The usage count circuit is used to count the usage times of the display screen; The usage information includes the usage duration and / or the number of uses; the driving circuit having completed the trial period means that at least one of the following conditions is met: the usage duration reaches the preset duration, and the number of uses reaches the preset number of times.

7. The driving circuit according to claim 6, characterized in that: The usage time statistics circuit comprises: The protocol analysis circuit is used to receive the display-related data sent by the control card to the drive circuit and analyze the periodic signal therefrom; The usage duration counting circuit is used to count the periodic signal and update the usage duration according to the counting situation.

8. The driving circuit according to claim 7, characterized in that: The periodic signal includes any one of a frame change signal, a line change signal, a latch signal, and a clock signal.

9. The driving circuit according to claim 5, characterized in that: The usage count counting circuit comprises: A power-on reset circuit, used to generate a reset signal when power is turned on; The usage count circuit is used to update the usage count after receiving the reset signal.

10. A display screen system, characterized in that: It comprises a control card, a constant current drive circuit, a display screen and a drive circuit as described in any one of claims 1 to 9; wherein, The display screen includes a plurality of lamp beads arranged in an array, and the control card is used to send display-related data to the drive circuit; The driving circuit is connected between the control card and the constant current driving circuit, and is used to receive display-related data sent by the control card and output it to the constant current driving circuit; The constant current driving circuit lights up the lamp beads of the display screen according to display-related data.

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