A display parameter updating method, a driver chip and a display device

Abstract

The embodiment of the present invention provides a display parameter update method, a driver chip and a display device, wherein the method is applied to the driver chip of the display, the driver chip is connected to the transmission interface of the display, and the method includes: receiving a configuration write command input by the transmission interface, the configuration write command is used to trigger the driver chip to update data to the memory of the display; after receiving the configuration write command, matching the target configuration file in the memory to obtain a matching result; based on the matching result, updating the configuration data input by the transmission interface to the memory. Compared with the prior art, during the update process, the embodiment of the present invention monitors the write configuration parameter command and transmits the configuration data from the existing transmission interface of the display, without the need to disassemble the display, and the configuration update is faster and more convenient.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display parameter updating method, a driver chip and a display device. Background Art

[0002] With the popularity of electronic products, more and more monitors are used. However, the usage scenarios of monitors are complex and changeable, and even the same product may appear in different usage environments. When the product leaves the factory, the configuration parameters of its monitor are all unified standards, which cannot be applied to different usage environments. Therefore, in some cases, the monitor needs to be re-debugged or reconfigured to adapt to different usage environments. In the prior art, the monitor needs to be disassembled from the overall device during configuration, and then the configuration data is written on the test point of the PCBA (Printed Circuit Board Assembly); after writing the configuration data, the monitor is assembled back to the original device. The update process is complicated and has high technical requirements.

[0003] It can be seen that currently updating the display configuration parameters requires disassembly of the screen, which leads to inconvenient updating. Summary of the invention

[0004] In view of this, an object of the embodiments of the present invention is to provide a display parameter update method, a driver chip and a display device, which can update the configuration file of the display without disassembling the display, and the update is faster and more convenient.

[0005] In the first aspect, the present application provides the following technical solution through an embodiment:

[0006] A display parameter updating method is applied to a driver chip of a display, wherein the driver chip is connected to a transmission interface of the display, and the method comprises:

[0007] Receive a configuration write command input by the transmission interface; wherein the configuration write command is used to trigger the driver chip to update data to the memory of the display; after receiving the configuration write command, match the target configuration file in the memory to obtain a matching result; based on the matching result, update the configuration data input by the transmission interface to the memory.

[0008] Optionally, the target configuration file is a first configuration file, and the matching result indicates that the first configuration file is matched; and updating the configuration data input by the transmission interface to the memory of the display based on the matching result includes:

[0009] Determine whether the first configuration file to be updated is in use; if not, update the first configuration file based on the configuration data; if so, jump to execute the step of receiving the configuration write command input by the transmission interface.

[0010] Optionally, the determining whether the first configuration file to be updated is in use includes:

[0011] Obtain an identification parameter in the driver chip; wherein the identification parameter is used to identify a configuration file currently in use; determine whether the identification parameter matches the first configuration file; if so, determine that the first configuration file is in use; if not, determine that the first configuration file is not in use.

[0012] Optionally, the target configuration file is a second configuration file, and the matching result indicates that the second configuration file is not matched; and updating the configuration data input by the transmission interface to the memory of the display based on the matching result includes:

[0013] A second configuration file is newly created in the memory; and the configuration data is written into the second configuration file.

[0014] Optionally, after writing the configuration data into the second configuration file, the method further includes:

[0015] A read instruction of the second configuration file is received from the transmission interface; based on the read instruction, a verification address of the second configuration file is read; based on the verification address, verification data of the second configuration file is read, the verification data being used to verify whether the second configuration file is correct; when it is determined that the second configuration file is correct based on the verification data, the configuration parameters of the second configuration file are stored in the register of the driver chip.

[0016] Optionally, the driver chip is connected to the memory via an I2C interface, and the step of updating the configuration data inputted by the transmission interface into the memory of the display comprises:

[0017] Acquire status information of the I2C interface; and update the configuration data into the memory based on the status information.

[0018] Optionally, before receiving the configuration write command input by the transmission interface, the method further includes:

[0019] Reading configuration parameters of a first configuration file in the memory; the first configuration file is a configuration file preset in the memory; storing the configuration parameters of the first configuration file in a register of the driver chip, and starting the display based on the configuration parameters.

[0020] Optionally, the transmission interface is an embedded display interface eDP.

[0021] In the second aspect, based on the same inventive concept, the present application provides the following technical solution through an embodiment:

[0022] A driver chip comprises: a memory for storing program codes; and a processor connected to the memory and used to read the program codes from the memory to execute the method described in any one of the claims in the first aspect above.

[0023] In the third aspect, based on the same inventive concept, the present application provides the following technical solution through an embodiment:

[0024] A display device comprises: a driving chip, a transmission interface and a memory, wherein the driving chip is connected to the transmission interface and the memory respectively, and the driving chip is used to execute any one of the methods described in the first aspect above.

[0025] In the fourth aspect, based on the same inventive concept, the present application provides the following technical solution through an embodiment:

[0026] A storage medium having program code stored thereon, wherein the program code, when executed by a processor, implements the method described in any one of the claims in the first aspect above.

[0027] In an embodiment of the present invention, a display parameter update method, a driver chip, and a display device are provided, wherein the method is applied to a driver chip of a display, the driver chip is connected to a transmission interface of the display, and the method comprises: receiving a configuration write command input by the transmission interface, the configuration write command is used to trigger the driver chip to update data to a memory of the display; after receiving the configuration write command, matching a target configuration file in the memory to obtain a matching result; based on the matching result, updating the configuration data input by the transmission interface to the memory. Compared with the prior art, in the updating process, the embodiment of the present invention monitors the write configuration parameter command and transmits the configuration data from the existing transmission interface of the display, and does not need to disassemble the display, so the configuration update is faster and more convenient.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A flow chart of a display parameter updating method provided by a preferred embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the principle of reading the first configuration file when the display is started in a preferred embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the storage structure of the first configuration file and the second configuration file in a preferred embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the principle of reading the second configuration file according to the external system command in a preferred embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the conversion principle of the configuration data into data storable in the EEPROM in a preferred embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of components that can be expanded and connected to the Tcon IC in a preferred embodiment of the present invention;

[0036] Figure 7 The figure is a schematic diagram of the structure of a driving chip provided in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0038] Please refer to Figure 1 In this embodiment, a display parameter updating method is provided. The method can be applied to a display driver chip, and the driver chip is connected to a transmission interface of the display. The method comprises the following steps:

[0039] Step S10: receiving a configuration write command input by the transmission interface; wherein the configuration write command is used to trigger the driver chip to update data to the memory of the display.

[0040] In step S10, when the configuration data of the display needs to be upgraded, an external system can be connected through the transmission interface of the display, and the external system can be a PC (Personal Computer) or a special tooling for display configuration. The external system can send a configuration write command to the display driver chip and transmit the configuration data used to update the configuration of the display, and control the driver chip to perform the update action. The driver chip can be a Tcon IC (Timing Controller Integrated Circuit). The transmission interface may be different in displays of different types or configurations, and the transmission interface may be an interface such as eDP (embedded DisplayPort) and miniDP (mini DisplayPort). The external system can use the AUX CH (AUX Channel) in the transmission interface to transmit commands and configuration data to the Tcon IC, which can ensure that the normal image data transmission of the transmission interface is not affected. Therefore, when monitoring the transmission interface, the AUX CH channel of the transmission interface can be monitored.

[0041] For example, in a car display, a set of display configuration parameters are usually debugged at room temperature of 25°C as fixed settings for the display when the vehicle leaves the factory. However, the vehicle usage environment is complex and changeable, and a set of fixed configuration parameters often cannot fully exert the performance of the display, or cannot be well adapted to the usage environment. At this time, it is necessary to update the parameter data of the car display. An external system can be connected to the eDP interface reserved for the display, and the Tcon IC can be controlled to listen to the configuration write command of the AUX CH channel. When executing the command, the Tcon IC can be controlled by the MCU (Microcontroller Unit) therein.

[0042] Step S20: after monitoring the configuration write command, updating the configuration data input by the transmission interface into the memory of the display.

[0043] In step S20, the configuration data may include: DGC table (Digital Gamma Curve table) data, setting parameters in PGAMA (Programmable Gamma Buffer), setting parameters in PMIC (Power Management IC), etc. In the following text of this embodiment, DGC table data is taken as an example for detailed description, and the update of other configuration data can also be performed with reference to it.

[0044] Tcon IC is connected to the memory through an I2C (Inter-Integrated Circuit) interface. When the configuration data is DGC table data, the memory corresponds to an EEPROM (Electrically ErasableProgrammable read only memory) memory. When Tcon IC listens to the configuration write command, the configuration data input by the external system can be written into the EEPROM through the I2C master (I2C controller) to achieve updating during the normal display of the screen. In other embodiments, the I2C interface can also be replaced by the same type of interface.

[0045] Furthermore, since the I2C interface of Tcon IC may be used during the normal display process of the display, the configuration data cannot be written from the I2C interface to the memory during the use of the I2C interface. Therefore, in the present embodiment, the working state of the I2C master controller in TconIC can be obtained to determine the state information of the I2C interface, and the state information is divided into a use state and an unused state. Then, based on the state information, the configuration data is updated to the memory in a time-sharing multiplexing manner. When the I2C interface is in an unused state, the I2C master controller can be controlled to write the configuration data to the EEPROM memory through the I2C interface. The state information is used to determine whether the I2C interface is being used, thereby realizing the time-sharing multiplexing update configuration file, which can ensure that the normal display of the display is not affected during the update process.

[0046] When writing configuration data to the memory, it is necessary to match the target configuration file in the memory according to the configuration write command to obtain a matching result. Specifically, the configuration write command carries the file identifier of the configuration file to be updated, and the corresponding target file is searched in the memory based on the file identifier. The target file is the configuration file that currently needs to be updated. The file identifier can be the name of the configuration file, the number of the configuration file, the starting address of the configuration file, etc., without limitation. The matching result can include two situations, one is matching the corresponding target file, which will be explained below by taking the target file as the first configuration file as an example; the other is not matching the corresponding target file, which will be explained below by taking the target file as the second configuration file as an example.

[0047] 1. The matching result is to match the target configuration file (the first configuration file), that is, the original configuration file is updated.

[0048] The configuration file corresponds to the configuration data. For example, when the configuration data is DGC table data, the updated configuration file also corresponds to the DGC table file. Before writing the configuration data to the EEPROM memory of the display, the configuration file is stored in the EEPROM memory, where the number of configuration files is at least 1. When the display is started, the DGC table file in the EEPROM needs to be read into the register of the Tcon IC, and then started based on the DGC table. At this time, after the display is started, at least one of the configuration files in the EEPROM memory is in use, and it is not writable when the configuration file is in use.

[0049] It should be noted that in this embodiment, the first configuration file can be used by default when the display is started, and the first configuration file can be the original configuration file, so as to achieve normal startup of the display. Avoid errors in other configuration files causing the display to fail to start; or avoid other configuration files being applicable to fewer scenarios, resulting in poor display effects and poor user experience. Specifically, first, when starting the display, the first configuration file in the memory can be read by default, and the configuration parameters corresponding to the first configuration file can be stored in the register of the Tcon IC; then, based on the configuration parameters stored in the register, the display is started. Figure 2 As shown, DCG1 represents the first configuration file.

[0050] Therefore, when updating the original configuration file in the EEPROM memory, it is necessary to determine whether the first configuration file to be updated is being used. When the first configuration file to be updated is in use, the DGC table data is not written to the EEPROM memory, and the step of receiving the configuration write command input by the transmission interface is jumped to execute, that is, step S10; when the updated first configuration file is in use, the I2C master controller is controlled to write the DGC table data to the EEPROM memory through the I2C interface and in a time-division multiplexing manner to implement the update of the first configuration file. The specific method for determining whether the first configuration file is being used can be: reading the identification parameter in the Tcon IC register, and using the identification parameter to feedback the DGC table file used, and each DGC table file can correspond to a unique identification parameter; the specific implementation steps are as follows:

[0051] First, obtain the identification parameter in the Tcon IC; wherein the identification parameter is used to identify the configuration file currently in use. Then, determine whether the identification parameter matches the first configuration file. If the identification parameter matches the first configuration file, it means that the configuration parameters stored in the register of the Tcon IC are read from the first configuration file, and it can be determined that the first configuration file is in use. If the identification parameter does not match the first configuration file, it means that the configuration parameters stored in the register of the Tcon IC are from other configuration files, and it is determined that the first configuration file is not in use.

[0052] For example, if the identification parameter read at the Tcon IC specified address is 0, it can be determined that the current Tcon IC is using the first configuration file; if the identification parameter read at the Tcon IC specified address is 1, it can be determined that the current Tcon IC is using the second configuration file. This can ensure that the configuration data can be effectively written to the EEPROM memory during the normal display of the display, avoiding write failures or writes that affect the normal display of the display during the use of the configuration file.

[0053] During the process of updating the first configuration file, if the first configuration file is being used, the external system can also issue a command to enable the Tcon IC to selectively read other configuration files for use, thereby ensuring that the updated first configuration file is not in use. At this time, there are at least two configuration files.

[0054] 2. The matching result is that the target configuration file (second configuration file) is not matched, that is, a new configuration file needs to be added.

[0055] In some implementations, in order to make the display more applicable to more environments or scenarios, a new configuration file may be added to the display. At this time, the process of updating the configuration data input by the transmission interface to the memory of the display is:

[0056] First, a new second configuration file is created in the memory; then, the configuration data is written into the second configuration file. Specifically, the I2C master controller is controlled to write the DGC table data into the EEPROM memory through the I2C interface in a time-division multiplexing manner, so as to write data into the newly created second configuration file, thereby realizing the addition of the second configuration file.

[0057] Furthermore, after updating the second configuration file, the Tcon IC may receive a read instruction for the second configuration file from the transmission interface. Then, based on the read instruction, the verification address of the second configuration file is read; based on the verification address, the verification data of the second configuration file is read, and the verification data is used to verify whether the second configuration file is correct; when the second configuration file is determined to be correct based on the verification data, the configuration parameters of the second configuration file are stored in the register of the Tcon IC. For example, in an example of this embodiment, when the verification data is 0xE1, 0x00, 0x00, it means that the second configuration file is a correct configuration file and can be read into the register by the Tcon IC; otherwise, a relevant prompt of the configuration file error may be issued to prompt the operator to re-update or reconfigure the second configuration file; the storage structure of the DGC table file in the EEPROM memory is as follows: Figure 3 As shown, a is the first configuration file and b is the second configuration file.

[0058] After reading the second configuration file, the first configuration file can be put in an unused state. At this time, the first configuration file can be updated, such as Figure 4 As shown, DGC1 represents the first configuration file and DGC2 represents the second configuration file.

[0059] In order to achieve convenient control and update of the display configuration file, a communication protocol can be established between the external system and the Tcon IC. In some embodiments, the following communication protocol is provided:

[0060] Table 1. Communication protocol between external system and Tcon IC

[0061]

[0062] Through the communication protocol in Table 1 above, the following functions can be realized:

[0063] 1. Through the command "EEPROM" of the external system, the external system controls the I2Cmaster controller of the Tcon IC through the eDP interface to write to the EEPROM memory and create a second configuration file.

[0064] 2. Through the command "TCON" of the external system, the external system controls the Tcon IC to selectively read the DGC table of the EEPROM memory through the eDP interface.

[0065] 3. Through the command "STATUS" of the external system, the external system controls the Tcon IC through the eDP interface to feedback the status of the currently used DGC table file and the working status of the I2C master controller.

[0066] The above communication protocol can be used to realize the communication control of the Tcon IC by the external system, ensure the time of writing data into the EEPROM is controllable, and determine the working status of the Tcon IC in real time.

[0067] If the configuration data to be written is DGC table data, the DGC table data contains the gamma primary color data of R, G, and B. Each primary color data is divided into 256 levels, and the grayscale value is 12 bits. Since the EEPROM memory uses 8 bits as the storage unit, the R, G, and B data must be converted to 8-bit storage. After the external system establishes communication with the Tcon IC, the 12-bit is converted to 8-bit according to the data format specified in the protocol and transmitted to the EEPROM. Please refer to Figure 5 , which gives an example of DGCtable data conversion, showing how two 12-bit binary data (corresponding to 0 and 16 in DGC R at positions 0 and 1 in Input Data) are decomposed and recombined, and encoded to form three 8-bit data (corresponding to address0, address1, address2, data is 00, 00, 10 in binary R) for storage; after sequential conversion, 256*3RGB data can be converted to 384*3RGB data for storage. Packing the converted data in the preset format can be obtained as follows Figure 3 The storage structure shown. The format of the data packet is shown in Table 2 below:

[0068] Table 2 Data packet format

[0069]

[0070] Converting 12-bit data to 8-bit data for storage can ensure that the configuration data can be effectively written into the EEPROM. At the same time, using the above data packet format to store in the EEPROM can facilitate verification of the integrity or correctness of the file when the Tcon IC reads the configuration parameters of the configuration file.

[0071] In this embodiment, the Tcon IC can be connected to one or more devices through the I2C bus or other interfaces to update different types of configurations. For example, the Tcon IC can be connected to an MCU outside the Tcon IC through an SPI (Serial Peripheral Interface) to update or monitor the configuration of the external MCU; the Tcon IC can be connected to a PMIC through an I2C bus to update or monitor the configuration of the PMIC; the Tcon IC can be connected to a PGAMA through an I2C bus to update or monitor the configuration of the PGAMA, such as Figure 6 shown.

[0072] This embodiment provides a display parameter update method, which receives a configuration write command input from a transmission interface; after receiving the configuration write command, matches a target configuration file in a memory to obtain a matching result; based on the matching result, updates the configuration data input from the transmission interface to the memory, thereby completing the configuration update of the display. During the update process, the configuration data is transmitted from the existing transmission interface of the display, and the display does not need to be disassembled, so the configuration update is faster and more convenient.

[0073] See also Figure 7 Based on the same inventive concept, in another embodiment, a driver chip 800 is provided, comprising: a memory 801 for storing program codes; a processor 803 connected to the memory 801, for reading the program codes from the memory 801 to execute:

[0074] Receive a configuration write command input by the transmission interface; wherein the configuration write command is used to trigger the driver chip to update data to the memory of the display; after receiving the configuration write command, match the target configuration file in the memory to obtain a matching result; based on the matching result, update the configuration data input by the transmission interface to the memory.

[0075] Regarding a driver chip 800 in the above embodiment, the specific manner in which the processor 803 performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0076] Based on the same inventive concept, in another embodiment, a display device is provided, including a driving chip, a transmission interface and a memory, wherein the driving chip is connected to the transmission interface and the memory respectively, and the driving chip is used for:

[0077] Receive a configuration write command input by the transmission interface; wherein the configuration write command is used to trigger the driver chip to update data to the memory of the display; after receiving the configuration write command, match the target configuration file in the memory to obtain a matching result; based on the matching result, update the configuration data input by the transmission interface to the memory.

[0078] Regarding the display device in the above embodiment, the specific manner in which the driving chip performs the operation has been described in detail in the embodiment of the method, and will not be elaborated here.

[0079] Based on the same inventive concept, in another exemplary embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the steps of the following method are implemented:

[0080] Receive a configuration write command input by the transmission interface; wherein the configuration write command is used to trigger the driver chip to update data to the memory of the display; after receiving the configuration write command, match the target configuration file in the memory to obtain a matching result; based on the matching result, update the configuration data input by the transmission interface to the memory.

[0081] Regarding the computer-readable storage medium in the above embodiment, the specific manner of the method when the program is executed by the processor has been described in detail in the embodiment of the method, and will not be elaborated here.

[0082] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in this disclosure. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0083] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0084] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art 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. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A display parameter updating method, characterized in that: A driving chip applied to a display, the driving chip being connected to a transmission interface of the display, the method comprising: Receiving a configuration write command input by the transmission interface; wherein the configuration write command is used to trigger the driver chip to update data to the memory of the display; After receiving the configuration write command, matching the target configuration file in the memory to obtain a matching result; Based on the matching result, updating the configuration data input by the transmission interface into the memory; The target configuration file is a second configuration file, and the matching result indicates that the second configuration file is not matched; and based on the matching result, updating the configuration data input by the transmission interface to the memory of the display comprises: Creating a new second configuration file in the memory; Writing the configuration data into the second configuration file; receiving a read instruction of the second configuration file from the transmission interface; Based on the read instruction, read the verification address of the second configuration file; Based on the verification address, reading verification data of the second configuration file, the verification data being used to verify whether the second configuration file is correct; When it is determined that the second configuration file is correct based on the verification data, the configuration parameters of the second configuration file are stored in the register of the driver chip.

2. The method according to claim 1, characterized in that The target configuration file is a first configuration file, and the matching result indicates that the first configuration file is matched; The updating of the configuration data input by the transmission interface into the memory of the display based on the matching result comprises: Determining whether the first configuration file to be updated is in use; If not, updating the first configuration file based on the configuration data; If yes, jump to execute the step of receiving the configuration write command input by the transmission interface.

3. The method according to claim 2, characterized in that The determining whether the first configuration file to be updated is in use includes: Obtaining identification parameters in the driver chip; wherein the identification parameters are used to identify the configuration file currently in use; Determining whether the identification parameter matches the first configuration file; If yes, it is determined that the first configuration file is in use; If not, it is determined that the first configuration file is not in use.

4. The method according to claim 1, characterized in that: The driver chip is connected to the memory via an I2C interface, and the configuration data inputted from the transmission interface is updated to the memory of the display, comprising: Obtaining status information of the I2C interface; Based on the status information, the configuration data is updated in the memory.

5. The method according to claim 1, characterized in that Before receiving the configuration write command input by the transmission interface, the method further includes: Reading configuration parameters of a first configuration file in the memory; the first configuration file is a configuration file preset in the memory; The configuration parameters of the first configuration file are stored in the register of the driver chip, and the display is started based on the configuration parameters.

6. The method according to any one of claims 1 to 5, characterized in that: The transmission interface is an embedded display interface.

7. A driver chip, characterized in that: include: A memory for storing program codes; A processor is connected to the memory and is used to read the program code from the memory to execute the method described in any one of claims 1 to 6.

8. A display device, characterized in that: include: A driving chip, a transmission interface and a memory, wherein the driving chip is connected to the transmission interface and the memory respectively, and the driving chip is used to execute the method described in any one of claims 1 to 6.

9. A storage medium having a program code stored thereon, characterized in that: When the program code is executed by a processor, the method described in any one of claims 1 to 6 is implemented.

Images