CN115509477B

CN115509477B - Method, device, equipment and medium for dynamically displaying character images in vehicle-mounted display screen

Info

Publication number: CN115509477B
Application number: CN202211106017.6A
Authority: CN
Inventors: 王良清; 邓峰; 郭军
Original assignee: Shanghai Guowei Core Semiconductor Co ltd
Current assignee: Shanghai Guowei Core Semiconductor Co ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2024-04-09
Anticipated expiration: 2042-09-09
Also published as: CN115509477A

Abstract

The application provides a method, a device, equipment and a medium for dynamically displaying character images in a vehicle-mounted display screen, which are applied to the technical field of vehicle-mounted display and comprise the following steps: step 1: dividing the character image into a plurality of character image groups according to pixel data of the character image and a display position area of the character image in the vehicle-mounted display screen; step 2: and dynamically displaying the character images on the vehicle-mounted display screen according to the plurality of character image groups. By simplifying dynamic display control on real-time information such as vehicle speed in a vehicle-mounted display screen system, dynamic display is carried out by taking a character image group as a unit, the average update frequency of associated configuration of character images and corresponding system operation power consumption are reduced, and the capability of a main control safety MCU system for simultaneously displaying more character images is improved.

Description

Method, device, equipment and medium for dynamically displaying character images in vehicle-mounted display screen

Technical Field

The application relates to the technical field of vehicle-mounted display, in particular to a method, a device, equipment and a medium for dynamically displaying character images in a vehicle-mounted display screen.

Background

In addition to displaying application information such as entertainment and navigation for a driver or a passenger, the vehicle-mounted display screen has an important function of displaying current state data of an automobile in real time, such as key information of instantaneous speed, residual oil quantity, braking condition, automobile lamp condition, tire pressure condition and the like. Generally, the vehicle-mounted intelligent system can send the key information to the graphic processor (Graphics Processing Unit, GPU) for video processing and to the micro control unit (MicroController Unit, MCU) for safety monitoring chip; the GPU combines the key information and the application information and outputs the key information and the application information to the display screen; after the display screen receives the image data transmitted by the GPU, application information and key information are displayed on the screen and are generally displayed in a designated area of the display screen.

If the GPU works abnormally, or the transmission path of the GPU image data is abnormal, the display subsystem cannot receive the correct image data, or the display black screen or the key information image is lost, so that a driver cannot obtain the correct automobile state, and potential safety hazards are brought. Therefore, in order to eliminate the potential safety hazard, a screen display safety link chip is introduced into the vehicle-mounted intelligent system and is used for detecting whether the GPU image data are normal or not; or when the abnormality occurs, the safety monitoring chip MCU is informed, warning information and key information are displayed on the screen under the management of the MCU, a driver is reminded of adopting a safe driving mode, and the driver is prevented from being panicked due to the loss of the key information, so that dangerous consequences are avoided. The On-Screen safety link chip is to add safety related abnormality detection and processing hardware logic On an On-Screen Display (OSD) chip for detecting whether the GPU image data is normal.

The screen display safety link chip can adopt different methods to detect whether the image transmission is abnormal or not. Common detection methods include: detecting physical connection faults of a communication interface, checking a cyclic redundancy check (Cyclic Redundancy Check, CRC) value of an image, detecting whether data of a hidden area of the image are normal, and detecting whether character images of an appointed area where key information is located are normal. When abnormality is detected, the screen display safety link chip informs the MCU; under the management of MCU, the screen display safety link chip modifies the image frame data, displays critical information which is vital to the driver, such as speed, direction, lamp condition and the like, on the vehicle-mounted display screen, and displays necessary warning information.

Currently, the on-screen security link chip utilizes character image technology to display these key information. The related data of a character image at least contains two parts, one part is pixel value data, namely pixel information of specific numbers, letters, special symbols or icons to be displayed in a small image block; the other part is configuration information for assisting the accompanying property, and is generally used for defining the pixel image size of the character image, that is, the size of the pixel as granularity, and the expected position area in the image frame.

Taking the example of displaying the instantaneous vehicle speed, such as the vehicle speed of 120 km/h, the hundred, ten and units respectively display character images of '1', '2' and '0'; and when the vehicle speed is 81 km/h, hundred, ten and one are respectively displayed with blank characters or character images of '0', '8', '1'.

However, in the prior art, for each target dynamic display information, the frequency of the configuration update performed by the MCU for the character image to be displayed is much more than 1 time in any time window exceeding 1 frame, for example, the detection time precision of the vehicle speed sensor is 1 second, but at least 5 times of the above-mentioned configuration cycles of "1", "2", and "0" are necessary in 1 second, which increases the communication overhead and the system power consumption of the MCU. In addition, the related configuration operation is performed by taking the character image as a unit, so when more character images related to dynamic display information are needed, such as the information of the vehicle speed, the residual mileage, the residual oil quantity/electric quantity and the like are needed to be displayed together at the same time or more warning words are needed to be displayed with a certain dynamic effect, if the watching effect which is needed to be seen by a driver can display all partial information continuously, not all the information to be displayed is divided into two parts, even more partial information is needed to be displayed in a more-than-one manner, and the related configuration of the character images of all the information is needed to be completed within a time window which is as short as possible; otherwise, if the associated configuration cannot be ensured to be completed within a short time window, the persistence effect of human vision may result in an abrupt, split-type viewing effect. However, many associated configurations are completed within a time window as short as possible, or may not be completed at all, because the MCU communication time of the associated configuration of a single character image is established; or marginally done but exacerbates the communication overhead and system power consumption of the MCU. In addition, due to the increased implementation delay of the associated configuration of a certain information to be displayed, the display information may be updated in an untimely or burry manner, so that the driver loses good grasp of the real-time vehicle condition, and the driver may react and misjudge in a moment, for example, when the updated untimely information collides with some other information, which may further cause serious risk of consequences.

Therefore, a new technical solution for dynamically displaying character images in an on-screen safe link chip is needed.

Disclosure of Invention

In view of this, the embodiments of the present disclosure provide a method, an apparatus, a device, and a medium for dynamically displaying a character image on a vehicle-mounted display screen, so as to solve the problem that in the prior art, the dynamic display of the character image on the vehicle-mounted display screen increases the communication overhead of the MCU and the system power consumption, and the technical problem that when the character image is dynamically displayed in units of character image, the display of the character image is not consistent, or the driver may have serious consequences due to an instant misjudgment of response, such as when the information that is not timely updated collides with some other information, caused by the untimely update of the information.

The embodiment of the specification provides the following technical scheme:

the embodiment of the specification provides a method for dynamically displaying character images in a vehicle-mounted display screen, which comprises the following steps:

step 1: dividing the character image into a plurality of character image groups according to pixel data of the character image and a display position area of the character image in the vehicle-mounted display screen;

step 2: and dynamically displaying the character images on the vehicle-mounted display screen according to the plurality of character image groups.

Preferably, step 1 comprises:

step 11: according to the display application of the character image, the pixel data and the display position area of the character image belonging to the same display application are divided into one character image group, so as to obtain a plurality of character image groups.

Preferably, step 11 comprises:

step 110: carrying out serial numbering on the display position area of the character image in the image frame to obtain a position number;

step 111: carrying out serial numbering on pixel data of the character image to obtain a pixel number;

step 112: and dividing pixel data and a display position area of the character image belonging to the same display purpose into one character image group according to the position number and the pixel number to obtain a plurality of character image groups.

Preferably, different character images are displayed in the same display position area in different image frames by the pixel number and the position number.

Preferably, the same character image is displayed in different display position areas in the same image frame by the pixel number and the position number.

Preferably, in step 2, the mapping relationship between the display position area in the character image group and the pixel data of the character image is updated by a mapping relationship update command, so that the character image is dynamically displayed on the vehicle-mounted display screen.

Preferably, the mapping relation update command includes: command word code, start position number, update position number, expected pixel number of updated character images, and communication check value.

Preferably, step 2 comprises:

step 21: and in one image frame section, dynamically displaying the pixel data of the character image corresponding to the display position area in the same character image group on the vehicle-mounted display screen.

Preferably, the display position area includes a vehicle speed area, and step 2 further includes:

step 22: if the running speed of the vehicle is in the high-speed section, displaying pixel data corresponding to the high speed in a first display position area of the image frame in the corresponding image frame section, and displaying pixel data corresponding to the running speed in a second display position area;

step 23: if the running speed of the vehicle is in the overspeed section, pixel data corresponding to overspeed is displayed in a first display position area of an image frame during a corresponding image frame section, and pixel data corresponding to the running speed is displayed in a second display position area.

Preferably, in step 22, displaying the pixel data corresponding to the running speed in the second display position area includes: and displaying the pixel data corresponding to the running speed in the second display position area at different display positions during different image frame segments so that the pixel data corresponding to the running speed is displayed in a scrolling mode during the corresponding image frame segments.

Preferably, in step 23, displaying the pixel data corresponding to the running speed in the second display position area includes: and highlighting pixel data corresponding to the driving speed in the second display position area during different image frame segments.

The embodiment of the specification also provides a character image dynamic display device in a vehicle-mounted display screen, which comprises:

module M1: dividing the character image into a plurality of character image groups according to pixel data of the character image and a display position area of the character image in the vehicle-mounted display screen;

module M2: and dynamically displaying the character images on the vehicle-mounted display screen according to the plurality of character image groups.

Preferably, the module M1 comprises:

sub-module M11: according to the display application of the character image, the pixel data and the display position area of the character image belonging to the same display application are divided into one character image group, so as to obtain a plurality of character image groups.

Preferably, the doing module M11 includes:

unit D110: carrying out serial numbering on the display position area of the character image in the image frame to obtain a position number;

unit D111: carrying out serial numbering on pixel data of the character image to obtain a pixel number;

Unit D112: and dividing pixel data and a display position area of the character image belonging to the same display purpose into one character image group according to the position number and the pixel number to obtain a plurality of character image groups.

Preferably, in the module M2, the mapping relationship between the display position area in the character image group and the pixel data of the character image is updated by a mapping relationship update command, so as to realize dynamic display of the character image on the vehicle-mounted display screen.

Preferably, the module M2 comprises:

sub-module M21: and in one image frame section, dynamically displaying the pixel data of the character image corresponding to the display position area in the same character image group on the vehicle-mounted display screen.

Preferably, the display position area includes a vehicle speed area, and the module M2 further includes:

sub-module M22: if the running speed of the vehicle is in the high-speed section, displaying pixel data corresponding to the high speed in a first display position area of the image frame in the corresponding image frame section, and displaying pixel data corresponding to the running speed in a second display position area;

sub-module M23: if the running speed of the vehicle is in the overspeed section, pixel data corresponding to overspeed is displayed in a first display position area of an image frame during a corresponding image frame section, and pixel data corresponding to the running speed is displayed in a second display position area.

Preferably, in the sub-module M22, displaying the pixel data corresponding to the running speed in the second display position area includes: and displaying the pixel data corresponding to the running speed in the second display position area at different display positions during different image frame segments so that the pixel data corresponding to the running speed is displayed in a scrolling mode during the corresponding image frame segments.

Preferably, in the sub-module M23, displaying the pixel data corresponding to the running speed in the second display position area includes: and highlighting pixel data corresponding to the driving speed in the second display position area during different image frame segments.

The embodiment of the specification also provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can execute the method for dynamically displaying character images in the vehicle-mounted display screen.

The embodiment of the specification also provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions execute the method for dynamically displaying the character images in the vehicle-mounted display screen when being executed by a processor.

Compared with the prior art, the beneficial effects that above-mentioned at least one technical scheme that this description embodiment adopted can reach include at least: the dynamic display control of real-time information such as vehicle speed in the vehicle-mounted display screen system is simplified, the dynamic display is carried out by taking the character image group as a unit, the average update frequency of the associated configuration of the character images and the corresponding system operation power consumption are reduced, and the capability of the master control safety MCU system for simultaneously displaying more character images is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a vehicle-mounted display screen system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a distribution of character images according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a text warning message display according to an embodiment of the present application;

FIG. 4a is a schematic waveform diagram of a human eye persistence effect according to an embodiment of the present application;

FIG. 4b is a schematic diagram of displaying a character image according to an embodiment of the present disclosure;

FIG. 5a is a schematic diagram of a dynamic display of a character image according to the prior art according to an embodiment of the present application;

fig. 5b is a schematic diagram of dynamic display of a character image group in a vehicle-mounted display screen according to an embodiment of the present application;

FIG. 6a is a schematic diagram of a dynamic display of vehicle speed information according to an embodiment of the present application;

fig. 6b is a schematic diagram of dynamic display of vehicle speed information using character image groups according to an embodiment of the present application.

Detailed Description

Embodiments of the present application are described in detail below with reference to the accompanying drawings.

Other advantages and effects of the present application will become apparent to those skilled in the art from the present disclosure, when the following description of the embodiments is taken in conjunction with the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. The present application may be embodied or carried out in other specific embodiments, and the details of the present application may be modified or changed from various points of view and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, apparatus may be implemented and/or methods practiced using any number and aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the application by way of illustration, and only the components related to the application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the present invention may be practiced without these specific details.

As shown in fig. 1, the in-vehicle display screen system includes: GPU1, screen display safety link chip 2, MCU3, external memory 4 and display screen 5, wherein, screen display safety link chip 2 includes: an image processing unit 21 and a character image management unit 20.

The screen display safety link chip realizes the display of key information by using a character image technology. The related data of one character image at least comprises two parts, one part is pixel data, and the other part is configuration information for assisting the accompanying property. Take a character image showing the instantaneous vehicle speed as an example. The vehicle speed information in km/h generally contains 3 Arabic numerals, hundred, ten and units, and the character image displayed on each gear is the same in size, but the numerical value is instantaneously changed, especially two gears of ten and unit. The character image displayed on each gear at least comprises 10 conditions, and the numbers 0-9 are displayed; optionally, when the vehicle speed is less than 100 km/h, the hundred gear can be displayed in a digital mode 0 or a blank mode, for example, when the vehicle speed is 120 km/h, the hundred, ten and units respectively display character images of 1, 2 and 0; and when the vehicle speed is 81 km/h, hundred, ten and one are respectively displayed with blank characters or character images of '0', '8', '1'. As shown in fig. 2, the display position areas of the plurality of character images on the vehicle-mounted display screen are the character images in the display position areas, and the display position areas are respectively from top to bottom: the remaining mileage is 541km; the oil consumption per hundred kilometers is 17.8L; currently in the P gear; the accumulated mileage (odometer, ODO) was 54km.

Even when the same basic character image is displayed in different position areas of the image frame, it belongs to different character images, for example, if hundred, ten and one bit are all simultaneously "1", then three different character images are also displayed. Therefore, in order to achieve display of the vehicle speed, it is necessary in the prior art to define 30 character images, wherein it is assumed that the percentage may be greater than or equal to 2. If the 30 character images are to be stored completely, the overhead of the corresponding amount of storage resources is still relatively large.

Typically, the on-screen safety link chip stores 11 basic character images related to the display vehicle speed, where the 11 basic character images include: the MCU dynamically modifies the configuration information of a character image, such as modifying the position information of a character image between image frames, and associates different basic character images to realize the vehicle speed display. For example, only a vehicle speed of 120 km/h needs to be dynamically displayed on a display screen, and the following is a possible display control strategy: assume that each frame segment contains N image frames, where N is a positive integer; during the first frame segment, the display character image is expected to point to the hundred-position gear and is associated with the base character image of "1", so that the frame segment image will display "1" in the hundred-position gear; during the second frame segment, the display character image is expected to point to the ten-position range, and the base character image of "2" is associated, so that the frame segment image will display "2" in ten positions; during the third frame segment, the display character image is expected to point to the bit file and is associated with a base character image of "0", so that the frame segment image will display "0" in the bit; and in the fourth/fifth/sixth/… frame section, the vehicle speed of 120 km/h is dynamically displayed on the display screen in a circulating way.

Because the interval time of the image frames is very short, and the N value is properly selected according to the current screen display image frame rate, the persistence effect of human vision can lead a driver to see clear and coherent 120 characters on a display screen instead of intermittent single 1 or 2 or 0 characters on a certain display gear. It can also be seen that "dynamic display" means that in a relatively small time window, such as a time window of several image frames, on the premise that the human eye has a persistence of vision, the mapping association between the on-screen display positions of the different target character images and the base character images can be configured to take effect and fail accordingly, so that the different target character images can be correspondingly display-driven during the different image frame segments, without having to display-drive all the target character images during all the image frames.

Based on this, the embodiment of the present specification proposes a processing scheme: aiming at the dynamic control of real-time information such as vehicle speed in a vehicle-mounted display screen system, the character image group is used as a unit for dynamic display, the average update frequency of the associated configuration of the character images and the corresponding system operation power consumption are reduced, the capability of the main control safety MCU system for displaying more character images is improved, and the vehicle-mounted display screen system can display the running state information of the vehicle, such as speed, direction, lamp condition and the like, in a set area of the display screen more quickly.

The following describes the technical solutions provided by the embodiments of the present application with reference to the accompanying drawings.

step 1: the character image is divided into a plurality of character image groups according to pixel data of the character image and a display position area of the character image in the vehicle-mounted display screen.

The display position area is an area where the character image occupies when displayed on the display screen. For example, the vehicle speed and the lamp condition are displayed in different display position areas. The display position area of the vehicle speed can at least comprise three display positions, namely hundred, ten and one, respectively.

Further, the character image group may be a set of several character images for the same display purpose from the viewpoint of application purpose. For example, three-digit vehicle speed character images are defined as A groups, and corresponding display positions are sequentially numbered as #1, #2 and #3; and simultaneously, defining the residual mileage character image of the three digits as a B group, and orderly editing corresponding display positions as #4, #5 and #6. The storage number of the pixel data of the character image is denoted by @ prefix, which is actually an index of the storage location. The configuration of the association map of #i and @ j is to associate the area and size of the position to be displayed of the character image with the content to be displayed, i.e. the pixel data of the character image.

In the embodiment of the present specification, the manner of dividing the character image into the plurality of character image groups is not limited, and exemplary character images of hundred, ten and one-step for displaying the vehicle speed are divided into the same character image group, and similarly, the division of all the character images is completed to obtain the plurality of character image groups.

In an alternative embodiment, the character images to be displayed macroscopically and simultaneously can be divided into the same character image group, and synchronous dynamic display can be performed in the vehicle-mounted display screen.

In the embodiment of the present specification, step 1 includes: step 11: according to the display application of the character image, the pixel data and the display position area of the character image belonging to the same display application are divided into one character image group, so as to obtain a plurality of character image groups.

The setting of the display application in the embodiment of the present specification is not limited, and may be set according to a specific case, and exemplary display applications may include a vehicle speed, a lamp condition, and the like.

In an alternative embodiment, step 11 includes: step 110: carrying out serial numbering on the display position area of the character image in the image frame to obtain a position number; step 111: carrying out serial numbering on pixel data of the character image to obtain a pixel number; step 112: and dividing pixel data and a display position area of the character image belonging to the same display purpose into one character image group according to the position number and the pixel number to obtain a plurality of character image groups.

In the embodiment of the present specification, different character images are displayed in the same display position area and in different image frames by the pixel number and the position number. Further, the same character image is displayed in different display position areas in the same image frame by the pixel number and the position number.

Specifically, in the embodiment of the present disclosure, the possible display position areas of the character image in the image frame are sequentially numbered to obtain the position numbers, the pixel data of the character image is also sequentially numbered to obtain the pixel numbers, the pixel data represents the digitized representation of the character image, and by specific association mapping of the position numbers and the pixel numbers, different character images can be displayed in different image frames for the same display position area, and the same character image can be displayed in different display position areas in the same image frame.

Specifically, in step 2, the mapping relation between the display position area in the character image group and the pixel data of the character image is updated through the mapping relation update command, so that the character image is dynamically displayed on the vehicle-mounted display screen.

In the embodiment of the present specification, a mapping relation update command of the MCU for the display position area of the character image and the character image is designed. The MCU can change the display positions of a plurality of character images in a certain character image group and the mapping relation of the character images by sending out a mapping relation update command, so that the dynamic display of the character images can be controlled rapidly, efficiently and with lower power consumption.

Wherein the mapping relation update command includes: command word code, start position number, update position number, expected pixel number of updated character images, and communication check value.

Table 1 is a description of a mapping relation update command provided in the embodiment of the present disclosure, and as shown in table 1, the MCU may modify mapping correspondence relation between N consecutive display positions and its character image starting from the start position P0 by triggering execution of the mapping relation update command at a time. As shown in Table 1, the command format of the mapping relation update command is very concise, which is very convenient for the dynamic display and efficient control of a group of numerous character images.

In one embodiment, if the vehicle speed of "120" is to be displayed, the display positions of hundred, ten and one bit are numbered 4, 5 and 6, and the index numbers of the three character images of "0", "1" and "2" are set to 0, 1 and 2; the character images of "1", "2", "0" can be mapped to the hundred, ten and one-step positions of the vehicle speed display area in sequence by a mapping relation update command of "cmd_map_up (0 x05,4,3,0x010200,0x279 b)". In a time window with constant vehicle speed, the MCU does not need to update the mapping relation during each image frame; only when the vision persistence effect of human eyes is required to be maintained or the vehicle speed is changed, the mapping relation updating command is required to be triggered once again.

Wherein CMD in cmd_map_up is an english abbreviation for command (command), map is a meaning of map, and up is an english abbreviation for update (update). Cmd_map_up represents one possible naming of the "map update command"; 0x05 in 0x05,4,3,0x010200,0x279b represents "command word code", this value can be set according to the specific case; in a real system, a certain constant value is selected according to actual requirements to uniquely represent a mapping relation update command; 4 corresponds to the "start position number", i.e., p0=4, indicating that this update first involves the character image pixel map of the 4 th display position; 3 corresponds to the number of updated positions, and the combination of the number of updated positions and the number of updated positions 4 means that the updating can involve the mapping of the 4 th, 5 th and 6 th display positions and the pixels of the character images to be displayed; 0x010200 corresponds to "update expected pixel number of character images", and in combination with the above embodiment of vehicle speed displaying "120", the basic index number is 0x01, and corresponds to "1", and this character image should be displayed in the display position area of the 4 th set of configuration sets, i.e., in the hundred steps; the basic index number is 0x02, and the character image corresponding to '2' is presented in the display position area of the 5 th set of configuration set, namely ten steps; the basic index number is 0x00, and the character image corresponding to 0 is presented in the position area of the 6 th set of configuration set, namely a position file; 0x279B corresponds to a "CRC check value", which in practice should be calculated based on the expected value of the above 4-segment parameter and provided together; thus, the receiving and responding processor of the "mapping update command", such as a logic circuit in the system, may compare the received reference check value with the calculated actual check value, and if a discrepancy is found, it means that the receiving of the above 4-segment parameter is abnormal.

TABLE 1

Where N is a positive integer, the bit width of each command parameter is characterized in table 1 by letters D, S, … C, etc. In a specific embodiment, it may be: d=s=l=i=8, c=16, i.e. there are: the identification code of the mapping relation update command is 8-bit width; the range of the value of the sequence number of the display position area is 0-255; a mapping update command may be more related to the update of 255 display location areas at most; up to 256 base character images mapped by a single display position area; the reference code of the specific selected communication check formula is a 16-bit width. In the embodiment of the present disclosure, the type of the communication check value is not limited, and may be exemplified by a CRC check value, and in fact, the communication check algorithm corresponding to the communication check value may be any custom check algorithm with little complexity.

Step 2 in the embodiment of the present specification includes: step 21: and in one image frame section, dynamically displaying the pixel data of the character image corresponding to the display position area in the same character image group on the vehicle-mounted display screen.

Specifically, in the embodiment of the present specification, pixel data of a character image that needs to be displayed in a certain display position area on the in-vehicle display screen is displayed in one image frame segment according to the character image group. The pixel data of the character image of the vehicle speed 120 and the corresponding display position area are divided into the same character pixel group in the embodiment of displaying the vehicle speed 120 and displayed in one image frame section, so that the problem that misjudgment occurs when the driver loses grasp of real-time vehicle conditions due to incontinuous information or untimely information update or burrs caused by incapability of completing the associated configuration of all the character images in one time window when the number of the character images required to be dynamically displayed in the prior art is large is solved.

Wherein, the display position area includes the speed area, step 2 still includes: step 22: if the running speed of the vehicle is in the high-speed section, displaying pixel data corresponding to the high speed in a first display position area of the image frame in the corresponding image frame section, and displaying pixel data corresponding to the running speed in a second display position area; step 23: if the running speed of the vehicle is in the overspeed section, pixel data corresponding to overspeed is displayed in a first display position area of an image frame during a corresponding image frame section, and pixel data corresponding to the running speed is displayed in a second display position area.

Specifically, in step 22, displaying the pixel data corresponding to the running speed in the second display position area includes: and displaying the pixel data corresponding to the running speed in the second display position area at different display positions during different image frame segments so that the pixel data corresponding to the running speed is displayed in a scrolling mode during the corresponding image frame segments.

Further, in step 23, displaying the pixel data corresponding to the running speed in the second display position area includes: and highlighting pixel data corresponding to the driving speed in the second display position area during different image frame segments.

For example, as shown in fig. 3, it is assumed that the system determines that the vehicle is traveling at a high speed when the vehicle speed value in km/h is in the range of 80 to 119, and that the vehicle speed value is at 120 or more, and that only the integer portion is processed and displayed. The vertical downward coordinate axis in fig. 3 is a time axis (T), and the time axis corresponds to the association configuration of the mapping relationship between the display position area of the character image corresponding to a fixed area on the vehicle-mounted display screen and the character image during each image frame segment. In the period of the frame sections of between% 1 and% 6, assuming that the vehicle speed is always 119, and the character images of high speed and speed with slightly smaller fonts are always associated at the two display positions of #0 and # 1; during the period of between 7 and 10 frame percent, assuming that the vehicle speed reaches 120 and above, two display positions #0 and #1 are changed into the configuration which is associated with more striking character images of super speed with slightly larger fonts; during the% 1 frame segment, the three character images of "119" are sequentially arranged in association with the three display positions #7- # 9; during the% 2 frame segment, no base character image remains in an associated configuration with any display position in #5- # 9; during the% 3 frame segment, the three character images of "119" are sequentially maintained in an associated configuration with the three display positions #6- # 8; during the% 4 frame segment, no character image remains in an associated configuration with any display position in #5- # 9; during the% 5 frame segment, the three base character images of "119" are sequentially in an associated configuration with the three display positions #5- # 7; during the% 6 frame segment, no base character image remains in an associated configuration with any display position in #5- # 9; in the period of the frame periods of the 1 percent to the 6 percent, the rolling dynamic effect of the corresponding warning information can be realized through the controllable updating of the association configuration of the three character images of the 119 percent in the period of the frame periods of the 1 percent, the 3 percent and the 5 percent and the three groups of continuous display positions respectively.

Further, during the period of the frame from the 1% to the 6%, the flicker dynamic effect of the corresponding warning information can be realized by keeping the controllable updating of the associated configuration of the display position areas of the #5- #9 without any character images during the period of the frame from the 2%, the 4% and the 6%.

Further, during the period of the frame section ranging from% 7 to% 10, dynamic display of a vehicle speed value of '12X' is developed at three display positions ranging from #2 to #4 with granularity of a single frame section, wherein X represents unknown data and can be any integer ranging from 0 to 9. To achieve a more striking warning effect, the character images at the positions #2 to #4 may be highlighted with a larger size, or with a higher contrast of the background and numerals, or the like.

The first display position area may represent an area where the display positions #0 to #1 in fig. 3 are located, and the second display position area may represent an area where the display positions #2 to #9 in fig. 3 are located.

It should be noted that, in order to achieve a scrolling and blinking dynamic effect during the%1 to%6 frame segments, and some dynamic display highlighting effect that may be additionally achieved during the%7 to%10 frame segments, the specific durations of these frame segments should be appropriately modulated, the specific modulation values of which are not within the scope of the embodiments of the present specification, but may indeed be achieved by the trigger time control of the mapping update command in the embodiments of the present specification.

In the embodiment of the present specification, the on-screen security link chip may sequence-number character images of specific numbers, letters, symbols or icons. If the character images are large in size and can be spliced by a plurality of repeated or shared general element character images, the element character images can be also numbered in an index way. And in addition, the MCU in the screen display safety link chip can realize dynamic display of various numbers, letters, symbols or icons conveniently, efficiently and with low power consumption by timely triggering and executing the mapping relation updating command, and can achieve the warning display effect on a driver.

In addition, in different image frames, the MCU can also conveniently realize dynamic effects such as rolling, flickering and the like of warning information by changing the mapping relation by adopting a moving mechanism.

[ example 1 ]

As shown in fig. 4a, a waveform diagram of the human eye persistence effect for a character image of a display position area (#i) on one display screen is shown. Wherein, the waveform signal being high indicates that the association configuration of the display position #i and the corresponding arbitrary character image is in an effective state; a low waveform signal indicates that the associated configuration is in a disabled state. The signal waveform representation is about a time axis (T) as a transverse axis, and the coordinates may be in seconds. The simple definition of the human eye persistence of vision effect is: an important characteristic of the human eye is the visual inertia, i.e. once the light image is formed on the retina, the human brain will maintain the sensation of this light image for a limited time, a physiological phenomenon known as persistence of vision. For medium-brightness light stimuli, the persistence time is about 0.1 to 0.4 seconds. Thus, the persistence effect with respect to human eye vision can be briefly described by equation (1) and equation (2):

Hi≥H _min ； (1)

Si≤S _max ； (2)

Wherein H is _min Representing the shortest retention time of the photoperiod on the retina, S _max Indicating the longest sensory persistence time for a light image that has been formed on the retina.

Based on the above description, equation (1) indicates that the light image must be maintained for a minimum period to be successfully formed on the retina of the human eye, and equation (2) indicates the maximum time that the light image can be maintained on the retina of the human eye after the successful formation. Thus, if the time difference between two successful formations of the same light image of the same display position area is too large, i.e. exceeds S _max The human eye may perceive a photo-incoherent viewing effect.

As shown in fig. 4b, the display position area of the same character image group is a schematic diagram in which each character image is dynamically displayed in the prior art, where the same group position is not limited to a specific physical distribution in the image frame, i.e. the concept of the position group is mainly corresponding to a certain group of related configuration with strong correlation, for example, two kinds of information such as a vehicle speed and a residual mileage are wanted to be displayed on the display screen at the same time, two character image groups can be defined, and two "mapping relation update commands" are respectively used to implement targeted content display update, and generally, the update frequency of the residual mileage display value is relatively small, for example, only needs to be updated once every 10 seconds, or the mileage value is updated once after 1 km less, and the update frequency of the vehicle speed is relatively high, for example, needs to be updated once every 0.5 seconds. Therefore, the map update command to update the vehicle speed is repeatedly executed a much larger number of times. In addition, if it is two-purpose per se If the display information can be updated at the same frequency in a certain application scene, the two display information can be combined into a group, and whether the two display information are adjacent to the physical display area or not is not required. As in the previous embodiment of the "120" vehicle speed display, in one particular embodiment, the corresponding character image "1" is displayed at the hundred gear labeled #j1 position, with the index number noted @1; displaying a corresponding character image '2' at a ten-position gear marked as a # J2 position, wherein the index number is marked as @2; displaying a corresponding character image '0' at a position marked as a # J3 position, wherein the index number is marked as @0; if a "1" at #J1 display position does not need to be updated, the latest time at which this "1" association configuration becomes again valid after being disabled should precede t3, where t3=t2+S _max Otherwise, the viewing effect of the hundred gear "1" is not consistent, wherein t1 and t2 respectively represent the configuration effective time and the configuration failure time of the "1" in the first cycle; after the configuration fails, the human eyes can still see a coherent 1 due to the persistence effect; to ensure a consistent visual effect of the human eye on a "1" in the first and second cycles, the configuration of a "1" is re-validated not too late, i.e. not later than t2+S, after time t2 _max Time of day. Therefore, the frequency of the reproduction of the associated configuration of the character image at the display position #j1 must be a predetermined threshold lower limit, for example, the reproduction of the associated configuration must be performed at least 5 times within 1 second; in the period of failure of the associated configuration of the "1" character image of the hundred gear, such as in the { t2-t3} time window shown in fig. 4b, the time window is reserved for ten-position and one-position display gears of the vehicle speed under the dynamic display control strategy in the prior art. Thus, at H _J2 +H _J3 ≤S _max In the case of the three-gear character image, the validation operation and the invalidation operation of the associated configuration do not adversely affect the coherent effect that the driver expects to see. Conversely, when there are more character images to be displayed dynamically, i.e. H _J2 +H _J3 +…>S _max At least the character image at the #J1 display position is provided with a discontinuous viewing effect, wherein H _J2 And H _J3 Respectively representThe retention time for successful formation of the photoperiod on the retina is to be displayed for "2" and "0" for the positional region numbers J2 and J3. In the embodiment of the present disclosure, the period of time from t2 to t3 is neither too long nor too short, and the human eye sees a discontinuous "1" beyond the maximum duration of the persistence effect of the character images of #j1, while being sufficient for the remaining character images of the same group to successfully form a photo image on the retina.

As shown in fig. 4a and 4b, the validation and invalidation of the associated configuration of the display position area of the character image and the mapping relationship of the character image is a schematic description given in an ideal case where the configuration time consumption is not considered. In a system with an MCU participating, there must be a real configuration time. As shown in fig. 5a and 5b, the comparison between the prior art and the character image dynamic display control strategy of the present application is performed in a practical environment.

It should be noted that the primary preconditions for fig. 5a and 5b are: the association configuration of the display position area of the character image and the mapping relationship between the character images is performed by only one system bus master. Although the multiple system bus master devices can synchronously execute the associated configuration of multiple character images, the cost of system bus hardware resources, system power consumption and the like can be multiplied, and the method is not a favorable solution idea of the invention.

On the premise that only one system bus master device executes the association configuration operation, the existing character image dynamic display control strategy is implemented by taking a character image as a unit to realize association configuration switching, and the application is implemented by taking a character image group as a unit.

As shown in fig. 5a, a prior art character image dynamic display control strategy is shown. Assuming that the time taken by the system bus master from the time of the associated configuration trigger of a character image to the time of the actual switch in effect is dA, this time taken typically contains a number of system bus commands, the number of which is assumed to be nA.

Fig. 5b shows a method for dynamically displaying character images in the vehicle-mounted display screen. Assuming that the time taken by the system bus master from the time of triggering the associated configuration of a certain character image group to the time of effecting its actual switching is dB, this time taken typically also contains a number of system bus commands, the number of which is assumed to be nB.

As shown in fig. 5a and 5b, the widest square represents a time window in which the mapping association of the character image with index number K with the display position area with number #i is in an active state, where K is an integer, k=0, 1, 2, 3, 4, 5, 6, 7, 8, …; the value of i can be J ₁ 、J ₂ 、J ₃ 、J ₄ 、J ₅ 、J ₆ 、J ₇ 、J ₈ …. In fig. 5a, t1r represents the actual time of validity of the association configuration of the character image 1; t1f represents an actual failure time indicating the associated configuration of the character image 1; t2r represents the actual effective time of the associated configuration of the character image 2; t2f represents the actual expiration time of the associated configuration of the character image 2; t3r represents the actual effective time of the associated configuration of the character image 3; t3f represents the actual expiration time of the associated configuration of the character image 3; in fig. 5b, t1r represents the actual effective time of the map update command of group 1 of character image groups; t1f represents the actual failure time of the mapping relation update command of group 1 of the character image group; t4r represents the actual effective time of the mapping relation update command of the group 4 of character image groups; t4f represents the actual failure time of the mapping relation update command of the group 4 of character image groups; t6r represents the actual effective time of the mapping relation update command of the group 6 of character image groups; t6f represents the actual failure time of the mapping relation update command of the group 6 of character image groups; in fig. 5b, X is the number of the display position area corresponding to the first character image in the same group, where X is an integer.

In summary, under the existing character image dynamic display control strategy, the number (α) of character images in which the association configuration update can be performed in the time window from the time't 1r' to the time 't1f+smax' is at most: "Smax/(dA+H) _min ) "round down result, add 1 again. Similarly, in the method for displaying character images dynamically in a vehicle-mounted display screen provided in the present application, the number of corresponding character image groups (β) is at most: "Smax/(dB+H _min ) "the result of rounding down, adding 1 again, note that the corresponding number of character images is the arithmetic summation result of all character images in the character image groups, and is denoted as Σ.

In the method for dynamically displaying character images in the vehicle-mounted display screen, dB values are generally similar to dA values, so that the number sigma of character images which can support coherent display in the method is much larger than the number alpha of character images which can support coherent display in the prior art. Therefore, the number of character images which can support the continuous display is remarkably improved.

In this application the nB value can be made equal or similar to the nA value, i.e. nB is slightly larger than nA, so the number of required system bus commands for the associated configuration of a single character image is reduced from 6 x nA/α to 6 x nB/Σ, since α is significantly smaller than Σ and na≡nb, a significant saving is obtained.

As shown in fig. 6a and 6b, in one embodiment, the vehicle speed information, which is formed by three display gear positions of hundred, ten and one position and may change with time, is displayed in three display positions of distribution #4, #5 and #6 during dynamic display to display respective gear position values thereof. In such an application scenario, the unit "Km/h" of the vehicle speed is stable and unchanged, and the character image is fixedly mapped and associated with four display positions #0 to # 3.

As shown in fig. 6a, where X represents a horizontal axis in the coordinates of the display screen, Y represents a vertical axis in the coordinates of the display screen, and any position on the display screen can be located by X and Y, so that a character image is dynamically displayed at a specific position on the display screen, and under the control strategy of dynamic display of the character image in the prior art, character images corresponding to respective numerical values of three display positions, such as "1", "2" and "0", are independently associated in three groups of frame segments that are continuous and cyclic, including configuration validation and invalidation; namely, 3n+0 th, 3n+1 th and 3n+2 th frame segments shown in fig. 6a, n is an integer variable. Because the lengths of the three groups of frame segments are long enough and not too long, under the effect of the visual persistence effect of human eyes, a driver can clearly see a coherent and complete '120' watching effect from a display screen, and the complete character images of all display gears of the vehicle speed can be seen by the driver at the same time. The frame segment may be a minimum of only one frame as long as continuity and integrity of the viewing effect can be ensured, and the specific duration of one frame depends on the on-site screen image refresh frame rate. Aiming at the possibility that the speed value of the vehicle can change at any time, three frame segments are taken as granularity to finish refreshing in a microcosmic way; for example, the vehicle speed is changed from 99 to 100, and the vehicle is finally completed after three frame segments of 'hundred bits from blank to 1', 'ten bits from 9 to 0', 'bits from 9 to 0', and a '199' viewing phenomenon regarded as 'burr' may occur during the final completion.

As shown in fig. 6b, in the method for dynamically displaying character images on a vehicle-mounted display screen provided in the present application, character images corresponding to respective numerical values of three display gear positions of a vehicle speed are configured in a synchronous association manner in the same frame segment, such as the 3n+0 frame segment shown in fig. 6 b. In the 3n+1 frame segment and 3n+2 frame segment shown in fig. 6b, the corresponding associated configuration of the two character images of the remaining mileage digits and the fuel tank margin warning icon may be additionally performed, and in one embodiment, the vehicle speed information, which is formed by three display gears of hundred, ten and one, and may change over time, is distributed in three display positions of #4, #5 and #6 during dynamic display to display respective gear values thereof. In the application scene, the unit Km/h of the vehicle speed is stable and unchanged, and the character image is fixedly mapped and associated with four display positions #0, #1, #2 and # 3; the residual mileage digital information is distributed in three display positions #9, #10 and #11 during dynamic display to display the numerical values of each gear respectively, the unit Km of the residual history is stable and unchanged, and the character image is fixedly mapped and associated with the two display positions #7 and # 8; character images of the mailbox margin alert icon are distributed at four display positions #12, #13, #14 and # 15. Similarly, as long as the three sets of frame segments are of appropriate length, the driver can see three consecutive and complete types of information from the display screen, where complete means that all character images of the three types of information can be seen by the driver at the same time. Similarly, the frame segment may be only one frame at a minimum, as long as continuity and integrity of the viewing effect is ensured. The vehicle speed value is microscopically refreshed with one frame segment as granularity, but the refresh frequency is the same as that in fig. 6a, and can be three frame segments, and no burr phenomenon occurs.

Therefore, in the method for dynamically displaying the character image in the vehicle-mounted display screen, aiming at the control of the dynamic display of the vehicle speed, the triggering execution quantity of related configuration commands on a system bus is effectively saved, the triggering execution quantity is approximately reduced from 3 times to 1 time, and potential burrs can be eliminated incidentally. More importantly, the viewing consistency and integrity of the character images corresponding to more other key information can be supported in the same-length time window.

In summary, under the character image dynamic display control strategy of the present invention, the number of character images that can support coherent display and the number of required system bus commands for the associated configuration of a single character image are both significantly optimized, so that the driving bandwidth level of the character image dynamic display under the given system bus environment and the system power consumption saving are effectively improved.

module M1: the character image is divided into a plurality of character image groups according to pixel data of the character image and a display position area of the character image in the vehicle-mounted display screen.

Wherein, module M1 includes: sub-module M11: according to the display application of the character image, the pixel data and the display position area of the character image belonging to the same display application are divided into one character image group, so as to obtain a plurality of character image groups.

Preferably, the doing module M11 includes: unit D110: carrying out serial numbering on the display position area of the character image in the image frame to obtain a position number; unit D111: carrying out serial numbering on pixel data of the character image to obtain a pixel number; unit D112: and dividing pixel data and a display position area of the character image belonging to the same display purpose into one character image group according to the position number and the pixel number to obtain a plurality of character image groups.

Specifically, different character images are displayed in the same display position area and in different image frames by the pixel number and the position number. Alternatively, the same character image is displayed in different display position areas in the same image frame by the pixel number and the position number.

In the module M2, the mapping relationship between the display position area in the character image group and the pixel data of the character image is updated through the mapping relationship update command, so that the character image is dynamically displayed on the vehicle-mounted display screen.

Specifically, the mapping relation update command includes: command word code, start position number, update position number, expected pixel number of updated character images, and communication check value.

Further, the module M2 includes: sub-module M21: and in one image frame section, dynamically displaying the pixel data of the character image corresponding to the display position area in the same character image group on the vehicle-mounted display screen.

Wherein, the display position area includes the speed area, module M2 still includes: sub-module M22: if the running speed of the vehicle is in the high-speed section, displaying pixel data corresponding to the high speed in a first display position area of the image frame in the corresponding image frame section, and displaying pixel data corresponding to the running speed in a second display position area; sub-module M23: if the running speed of the vehicle is in the overspeed section, pixel data corresponding to overspeed is displayed in a first display position area of an image frame during a corresponding image frame section, and pixel data corresponding to the running speed is displayed in a second display position area.

In an alternative embodiment, the sub-module M22 displays the pixel data corresponding to the running speed in the second display position area, including: and displaying the pixel data corresponding to the running speed in the second display position area at different display positions during different image frame segments so that the pixel data corresponding to the running speed is displayed in a scrolling mode during the corresponding image frame segments.

In an alternative embodiment, in the submodule M23, pixel data corresponding to the running speed is displayed in the second display position area, including: and highlighting pixel data corresponding to the driving speed in the second display position area during different image frame segments.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment focuses on differences from other embodiments. In particular, for the product embodiments described later, since they correspond to the methods, the description is relatively simple, and reference is made to the description of parts of the system embodiments.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A dynamic display method of character images in a vehicle-mounted display screen is characterized by comprising the following steps:

step 1: dividing a character image into a plurality of character image groups according to pixel data of the character image and a display position area of the character image in the vehicle-mounted display screen;

step 2: and dynamically displaying the character images on the vehicle-mounted display screen according to the plurality of character image groups, and carrying out corresponding configuration validation and invalidation operation on the mapping relation between the on-screen display positions of different target character images and the basic character images.

2. The method for dynamically displaying character images on a vehicle-mounted display screen according to claim 1, wherein the step 1 comprises:

step 11: and dividing pixel data of the character images belonging to the same display purpose and the display position area into one character image group according to the display purpose of the character images, so as to obtain a plurality of character image groups.

3. The method for dynamically displaying character images on a vehicle-mounted display screen according to claim 2, wherein the step 11 comprises:

step 110: carrying out serial numbering on the display position area of the character image in an image frame to obtain a position number;

step 111: carrying out serial numbering on the pixel data of the character image to obtain a pixel number;

step 112: and dividing pixel data of the character image belonging to the same display purpose and the display position area into one character image group according to the position number and the pixel number to obtain a plurality of character image groups.

4. A character image dynamic display method in a vehicle-mounted display screen according to claim 3, wherein different character images are displayed in different image frames in the same display position area by the pixel number and the position number.

5. A character image dynamic display method in a vehicle-mounted display screen according to claim 3, wherein the same character image is displayed in different display position areas in the same image frame by the pixel number and the position number.

6. The method according to any one of claims 1 to 5, wherein in step 2, the mapping relationship between the display position area in the character image group and the pixel data of the character image is updated by a mapping relationship update command, so as to realize dynamic display of the character image on the vehicle-mounted display screen.

7. The method for dynamically displaying character images on a vehicle-mounted display screen according to claim 6, wherein the map update command comprises: command word code, start position number, update position number, expected pixel number of updated character images, and communication check value.

8. The method for dynamically displaying character images on a vehicle-mounted display screen according to claim 6, wherein the step 2 comprises:

9. The method for dynamically displaying character images on a vehicle-mounted display screen according to claim 8, wherein the display position area includes a vehicle speed area, and the step 2 further includes:

Step 22: if the running speed of the vehicle is in a high-speed section, displaying the pixel data corresponding to the high speed in a first display position area of an image frame during the corresponding image frame section, and displaying the pixel data corresponding to the running speed in a second display position area;

step 23: and if the running speed of the vehicle is in an overspeed zone, displaying the pixel data corresponding to overspeed in a first display position area of an image frame in the corresponding image frame period, and displaying the pixel data corresponding to the running speed in a second display position area.

10. The method for dynamically displaying character images on a vehicle-mounted display screen according to claim 9, wherein displaying the pixel data corresponding to the traveling speed in the second display position area in step 22 includes: and displaying the pixel data corresponding to the running speed in the second display position area at different display positions during different image frame sections so as to enable the pixel data corresponding to the running speed to be displayed in a scrolling mode during the corresponding image frame sections.

11. The method for dynamically displaying character images on a vehicle-mounted display screen according to claim 9, wherein displaying the pixel data corresponding to the traveling speed in the second display position area in step 23 includes: and highlighting the pixel data corresponding to the driving speed in the second display position area during different image frame sections.

12. A character image dynamic display device in a vehicle-mounted display screen, characterized by comprising:

module M1: dividing a character image into a plurality of character image groups according to pixel data of the character image and a display position area of the character image in the vehicle-mounted display screen;

module M2: and dynamically displaying the character images on the vehicle-mounted display screen according to the plurality of character image groups, and carrying out corresponding configuration validation and invalidation operation on the mapping relation between the on-screen display positions of different target character images and the basic character images.

13. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of dynamically displaying character images in a vehicle-mounted display screen of any one of claims 1-11.

14. A computer storage medium storing computer executable instructions which when executed by a processor perform the method of dynamically displaying character images in a vehicle-mounted display screen according to any one of claims 1 to 11.