CN114801737B - Color matching method of automobile instrument panel and manufacturing method of backlight piece - Google Patents

Color matching method of automobile instrument panel and manufacturing method of backlight piece Download PDF

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Publication number
CN114801737B
CN114801737B CN202210405984.6A CN202210405984A CN114801737B CN 114801737 B CN114801737 B CN 114801737B CN 202210405984 A CN202210405984 A CN 202210405984A CN 114801737 B CN114801737 B CN 114801737B
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color
coordinate
backlight
block
printing
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CN114801737A (en
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吕冬芳
温洪亮
宁新亮
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Heilongjiang Tianyouwei Electronics Co ltd
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Heilongjiang Tianyouwei Electronics Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Arrangement of adaptations of instruments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B60K35/29—
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • B60K2360/188—

Abstract

The invention provides a toning method for a display area of an automobile instrument panel, a manufacturing method of a backlight sheet, the backlight sheet and the instrument panel, wherein the toning method of the display area is used for adjusting the display effect of the display area by adjusting the color of a monochromatic printing area on the backlight sheet, converting the display effect into a CMYK color domain in the toning process, dividing the CMYK color domain into a plurality of unit color lumps, normalizing the color of each unit color lump to obtain a unit color lump corresponding to a coordinate to be toned, setting the single color printing area into a CMYK value of a standard color lump closest to the unit color lump for printing, measuring the toned display area by lightening the backlight source, comparing the toned display area with a color coordinate range, and repeatedly performing printing and testing. The final display effect of the instrument panel obtained by the invention is necessarily closer to that of the final product, so that the instrument panel can better adapt to other interior trims of the vehicle, and the overall effect of the interior trims of the vehicle is improved.

Description

Color matching method of automobile instrument panel and manufacturing method of backlight piece
Technical Field
The invention relates to the technical field of automobile instrument panels, in particular to a color matching method of an automobile instrument panel, a manufacturing method of a backlight piece, the backlight piece and the instrument panel.
Background
The dashboard of a vehicle is a device that reflects the working conditions of various systems of the vehicle, and is provided with various indicator lights or alarm lights, such as a coolant level alarm light, a fuel quantity indicator light, a cleaning liquid indicator light, a high-beam and low-beam variable light indicator light, a driving force control indicator light, an airbag alarm light, and the like, so that a driver can know the vehicle condition at any time. The instrument panel has a display area for displaying these indicator lamps or alarm lamps. Specifically, the instrument panel comprises a backlight source, a backlight piece and a segment code liquid crystal panel, wherein the segment code liquid crystal panel is provided with a plurality of controllable light transmission areas corresponding to the display areas, the backlight piece is attached to the segment code liquid crystal panel and is provided with a plurality of monochromatic printing areas, and when the backlight source is lightened, light rays sequentially penetrate through the corresponding monochromatic printing areas and the controllable light transmission areas, so that colors are displayed on the display areas.
As the requirements of users for the interior of the vehicle are higher, the color of the display area on the dashboard needs to be adapted to the interior. In the prior art, when the backlight sheet is designed, although the color design of each monochromatic printing area on the corresponding backlight sheet picture has good adaptability with other interior trim of the vehicle, the backlight sheet is manufactured and then installed on an instrument panel, the display effect is often greatly deviated, the display effect of the display area on the instrument panel is lower than the harmony feeling of other interior trim of the vehicle, and the overall effect of the interior trim of the vehicle is influenced.
Disclosure of Invention
Based on the above situation, the main objective of the present invention is to provide a color matching method for an automobile dashboard, a method for manufacturing a backlight, a backlight and a dashboard, so that the display effect of a display area when the backlight is turned on can better adapt to other interior of a vehicle, thereby improving the overall effect of the interior of the vehicle.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a color matching method for a display area of an automobile instrument panel, wherein the instrument panel comprises a backlight source, a segment code liquid crystal panel and a backlight sheet which is positioned between the backlight source and the segment code liquid crystal panel and is attached to the back surface of the segment code liquid crystal panel, the backlight sheet comprises a plurality of monochrome printing areas which respectively correspond to a plurality of controllable light transmission areas on the segment code liquid crystal panel, and the controllable light transmission areas are used for forming a plurality of display areas of the instrument panel; the method comprises the following steps:
s100: determining the initial printing color of a corresponding single-color printing area on the backlight picture according to the target color name of the display area to be color-mixed, and printing the backlight picture to obtain a first sample of the backlight; the initial printing color is determined according to a preset color name, and the preset color name is limited with CMYK preset values;
s200: lighting a backlight source on an instrument panel assembled with the first sample, and testing to obtain an initial measurement color coordinate of the display area;
s300: judging whether the initial measurement color coordinate meets the color coordinate range required by the target color name, if so, finishing the color matching of the display area; if not, executing step S400;
s400: determining a coordinate to be color-mixed on a CIE chromaticity diagram according to the initial measurement color coordinate and the color coordinate range, and determining the position of the coordinate to be color-mixed in the CIE chromaticity diagram;
s500: converting the CIE chromaticity diagram into a CMYK color domain, dividing the CMYK color domain into a plurality of unit color blocks, and normalizing the color of each unit color block;
s600: determining a unit color block where the coordinate to be toned is located as a block to be toned, determining a standard color block which is closest to the color of the unit color block in a CMYK standard color card of printing equipment, and taking the standard color block as a selected color block;
s700: printing the monochrome printing area by using the printing equipment according to the CMYK value of the selected color block to obtain a second sample of the backlight piece, installing the second sample of the backlight piece on an instrument panel, lighting the backlight source, and testing to obtain a sample measurement color coordinate of the display area;
s800: judging whether the sample measured color coordinate meets the requirement of the color coordinate range required by the target color name or not, if so, finishing the color mixing of the display area; if not, selecting a standard color block adjacent to the previous selected color block on the CMYK standard color card as a new selected color block, and returning to the step S700; wherein the new selected color block does not include the selected color block of each previous time.
Preferably, the color coordinate range includes one target color coordinate;
the step S100 includes the steps of:
s111: selecting CMYK preset values defined by preset color names consistent with the target color name as basic colors;
s112: adjusting at least one of C, M and Y of the basic color by a preset amount to obtain an adjusted color;
s113: respectively taking the basic color and the adjusting color as initial printing colors of the monochromatic printing area, and printing the backlight picture to obtain a first sample of a plurality of backlight sheets;
a plurality of initial measurement color coordinates are obtained in the step S200;
in the step S300, the step of processing,
as long as the distance between one initial measurement color coordinate and the target color coordinate on the CIE chromaticity diagram is within a preset range, the initial measurement color coordinate meets the requirement of the color coordinate range; if the distance between any initial measurement color coordinate and the target color coordinate on the CIE chromaticity diagram is outside a preset range, the initial measurement color coordinate does not meet the requirement of the color coordinate range;
the method for determining the coordinates to be color-mixed in the step S400 includes: and selecting the initial measurement color coordinate closest to the target color coordinate as the coordinate to be toned.
Preferably, the color coordinate range includes a plurality of target color coordinates;
the S100 includes the steps of:
s120: selecting CMYK preset values defined by preset color names consistent with the target color names as printing colors, and printing a backlight picture to obtain a first sample of the backlight;
obtaining an initial measurement color coordinate in the step S200;
in the step S300, the step of processing,
as long as the distance between the initial measurement color coordinate and one of the target color coordinates on the CIE chromaticity diagram is within a preset range, the initial measurement color coordinate meets the requirement of a color coordinate range; if the distance between the initial measurement color coordinate and any target color coordinate on the CIE chromaticity diagram is outside a preset range, the initial measurement color coordinate does not meet the requirement of a color coordinate range;
the method for determining the coordinates to be color-mixed in the step S400 includes: and selecting the target color coordinate closest to the initial measurement color coordinate as a coordinate to be toned.
Preferably, in the step S600, determining the selected color block includes the steps of:
s601: determining C, M, Y and K values of the unit color blocks;
s602: and determining the positions of the color blocks to be adjusted on the CMYK standard color card according to the larger values of the C, M and Y of the color blocks to be adjusted, and selecting the standard color block closest to the position as the selected color block.
Preferably, each standard color block comprises an edge and an inner area located at the edge; the determination method for selecting the color patch in step S602 includes:
if the position point determined by the larger two values of C, M and Y of the color block to be adjusted is positioned in the inner area of one standard color block, selecting the standard color block where the position point is positioned as the selected color block;
and if the position point determined by the larger two values in the C, M and Y of the color block to be adjusted is positioned at the side line of the standard color block, selecting any standard color block positioned at the side line as the selected color block.
Preferably, in step S800, the one standard color block adjacent to the previous selected color block includes a standard color block having a common edge with the previous selected color block, a standard color block spaced by one row or one column from the previous selected color block, or a standard color block spaced by two rows or two columns from the previous selected color block.
Preferably, in the step S800, if the requirement on the color coordinate range is farther and farther in the multiple loop tests, the selected color block closest to the color coordinate range is selected as a new selected color block, and the step S700 is returned to;
when the backlight sheet is printed in the step S700, the printing device is used to print the monochrome printing area for multiple times according to the CMYK values of the selected color patches, and the transparency of the monochrome printing area is different for each printing.
Preferably, the step S100 further comprises:
s001: determining the display color of a display area corresponding to an indicator light or a warning light according to the display requirement of the indicator light or the warning light required by an instrument panel, taking the name of the display color as a target color name, determining the initial color of a monochrome printing area corresponding to the display area on the backlight picture according to the target color name, wherein the CMYK value of the initial color is a CMYK preset value limited by a preset color name consistent with the target color name;
s002: printing the monochrome printing area according to the CMYK value of the initial color by using the printing equipment to obtain a primary sample of the backlight piece;
s003: and lighting a backlight source of an instrument panel assembled with the primary sample, judging whether the display effect of the display area meets the requirement of the vehicle interior, if not, determining a color coordinate range corresponding to the target color name according to the current display effect and the requirement of the vehicle interior, and executing the step S100.
Preferably, the monochrome printing zone comprises a monochrome colour region, a first end colour region of a gradient colour region or a second end colour region of a gradient colour region.
Preferably, the target color names include red, green, yellow, and blue.
A second aspect of the present invention provides a method for manufacturing a backlight sheet for an instrument panel of an automobile, comprising the steps of:
s10: carrying out color matching on each display area of the instrument panel according to any one of the color matching methods;
s20: and printing the backlight picture by using the printing equipment according to the CMYK value of the single-color printing area determined at the end of color mixing to obtain the backlight.
A third aspect of the present invention provides a backlight for an instrument panel of an automobile, wherein the backlight is manufactured using the manufacturing method described above.
The invention provides an automobile instrument panel, which comprises the backlight sheet.
The color adjusting method of the instrument panel display area adjusts the display effect of the display area by adjusting the color of the monochromatic printing area on the backlight piece, adjusts the color of the monochromatic printing area into the color of a standard color block which can be printed by a printing device, and performs the color-adjusted display effect by lightening the backlight source during testing, so that the final display effect obtained by debugging is inevitably closer to the display effect of a final product, the instrument panel can better adapt to other interior trim of a vehicle, and the overall effect of the interior trim of the vehicle is improved; in addition, the color matching method does not need to purchase backlight sources of a plurality of manufacturers and exchange different resistors for testing, so that the cost of raw materials can be greatly reduced, and the influence of frequent modification of a circuit board on the testing effect can be reduced. Meanwhile, in the color mixing process, the designed RGB color is not directly used for printing, the RGB color domain is converted into a CMYK color domain, the CMYK color domain is divided into a plurality of unit color blocks, the colors of the unit color blocks are normalized, so that the unit color blocks have the same color, namely the same CMYK value, the selected unit color blocks are compared with the colors which can be printed by the printing equipment, the CMYK value of the color which can be printed by the printing equipment is used as the CMYK value of the unit monochrome printing area, namely, the color which can be printed by the printing equipment is directly selected as the color of the monochrome printing area, and therefore, the color difference between the designed RGB color and the converted CMYK color and the color which can be printed by the printing equipment is avoided, the color deviation between the designed backlight piece and the actually printed backlight piece is improved, and the difference between the display effect of the designed display area and the actual display effect is further reduced.
Other advantages of the present invention will be described in the detailed description, which is provided by the technical features and technical solutions.
Drawings
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:
FIG. 1 is a schematic structural diagram of an instrument panel according to a preferred embodiment of the present invention;
fig. 2 is a schematic structural view of a backlight sheet corresponding to the instrument panel shown in fig. 1 in a preferred embodiment of a color matching method for an automobile instrument panel provided by the present invention;
FIG. 3 is a flow chart of a preferred embodiment of a method for toning a dashboard of a vehicle according to the present invention;
FIG. 4 is a schematic diagram of an initial measurement color coordinate and a color coordinate range on a CIE chromaticity diagram in a preferred embodiment of the method for toning an automobile instrument panel according to the present invention;
fig. 5 is a schematic diagram of a CIE chromaticity diagram being converted into CMYK color domains and being divided into a plurality of unit color blocks in an embodiment of the method for toning an automobile dashboard according to the present invention;
FIG. 6 is a schematic diagram of a CMYK standard color chart according to a preferred embodiment of the present invention;
FIG. 7 is a flow chart of a preferred embodiment of a method for manufacturing a backlight unit according to the present invention.
FIG. 8 is a schematic structural diagram of a backlight assembly in accordance with a preferred embodiment of the present invention;
FIG. 9 is a diagram illustrating display states of display regions in a preferred embodiment of a dashboard provided in accordance with the present invention;
fig. 10 is a drawing of a CMYK standard color chart printed by a printing device according to a preferred embodiment of the present invention.
In the figure:
10. a dashboard; 11. a first display area; 12. a second display area; 13. a third display area; 14. a fourth display area; 15. a fifth display area;
20. a backlight sheet; 21. a first monochrome printing zone; 22. a second monochrome printing zone; 23. a third monochrome printing zone; 24. a fourth monochrome print zone; 25. and a fifth monochrome print zone.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the nature of the present invention, well-known methods, procedures, and components have not been described in detail.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
An instrument panel of the automobile is provided with a plurality of display areas, such as a cooling liquid level alarm display area, a fuel quantity display area, a cleaning liquid display area and the like. Specifically, the dashboard comprises a backlight source, a segment code liquid crystal panel and a backlight sheet which is arranged between the backlight source and the segment code liquid crystal panel and is attached to the back of the segment code liquid crystal panel, wherein the segment code liquid crystal panel is provided with a plurality of controllable light transmission areas, and the controllable light transmission areas are used for forming a display area of the dashboard, namely each controllable light transmission area corresponds to one display area on the dashboard. The backlight sheet comprises a plurality of monochromatic printing areas, the plurality of monochromatic printing areas respectively correspond to a plurality of controllable light transmission areas on the segment code liquid crystal plate, namely, the display area is described for the whole instrument panel, the display area corresponds to one controllable light transmission area of the segment code liquid crystal plate and one monochromatic printing area of the backlight sheet, and corresponds to the backlight source behind the monochromatic printing area, namely, the instrument panel is provided with a plurality of display areas, and the plurality of display areas, the plurality of controllable light transmission areas, the plurality of monochromatic printing areas and the backlight source are in one-to-one correspondence. It is to be understood that the backlight may further include a light blocking region outside the monochrome printing region, such as a black light blocking region, to reduce the influence of other regions on the display effect of the display region corresponding to the monochrome printing region as much as possible. The color of the monochrome printing area can be pure color or mixed color. In particular, the backlight may be an LED light source, the color of which may be chosen to coincide as much as possible with the color of the monochromatic print zone. The instrument panel also comprises a circuit board, the backlight source can be arranged on the circuit board, and when the backlight source is lightened, light penetrates through the corresponding monochromatic printing area and the controllable light-transmitting area, so that the display area of the instrument panel has a certain display effect. Herein, the monochrome printing region described herein means that the colors in the region are substantially uniform, with respect to the gradation, the combination of colors, or the R, G, B values or the C, M, Y, K values of the colors in the region are substantially equal everywhere.
Referring to fig. 1, there is shown an embodiment of an instrument panel 10 having a plurality of display areas, such as a first display area 11, a second display area 12, a third display area 13, etc., thereon; the segment code screen (not shown) has a plurality of controllable light-transmitting regions (not shown), such as a first controllable light-transmitting region, a second controllable light-transmitting region, a third controllable light-transmitting region, and so on; the backlight has a monochrome printing area, as shown in fig. 2, fig. 2 shows a backlight 20 for the instrument panel of fig. 1, which has a first monochrome printing area 21, a second monochrome printing area 22, a third monochrome printing area 23, and so on, and a plurality of backlight sources (not shown in the figure), such as a first backlight source, a second backlight source, a third backlight source, and so on, are disposed on a side of the backlight 20 away from the segment code screen. The plurality of monochrome printing areas correspond to the plurality of controllable light-transmitting areas on the segment code liquid crystal panel and the plurality of display areas on the instrument panel, that is, when the instrument panel 10 is assembled, in terms of position, the first backlight source, the first monochrome printing area 21, the first controllable light-transmitting area correspond to the first display area 11, the second backlight source, the second monochrome printing area 22, the second controllable light-transmitting area correspond to the second display area 12, the third backlight source, the third monochrome printing area 23, the third controllable light-transmitting area correspond to the third display area 13, in the formed backlight sheet, each monochrome printing area 21 is a color block, as shown in fig. 2 and fig. 8, the first monochrome printing area 21, the fourth monochrome printing area 24 are green color blocks, the second monochrome printing area 22, the fifth monochrome printing area are red color blocks, the third monochrome printing area 23 is blue color block, and thus, when the corresponding backlight source is lit, the corresponding display areas basically display corresponding colors, as the first display area 11, the fourth monochrome printing area 14, the second monochrome display area 12, the third monochrome display area 13, and the third monochrome display area 13. Here, the color of each display region is only a relatively broad description of the color, for example, green may include a specific color with a plurality of dominant hues of green such as light green and bright green, red may include a specific color with a plurality of dominant hues of red such as dark red and bright red, and blue may include a specific color with a plurality of dominant hues of blue such as light blue and bright blue.
In the production of an instrument panel, after a backlight source is lightened, the display effect of a display area on the instrument panel is often incompatible with the effect of other vehicle interior trim, for example, although red is desirable, the dark red effect in some interior trim is more compatible, and the bright red effect in some interior trim is more compatible, so that the display effect of the display area needs to be adjusted. The existing manufacturers change the backlight sources of different manufacturers or adjust the resistance value of the resistor connected with the backlight sources so as to adjust the display effect of the display area. However, in this way, on one hand, a large number of manufacturers' backlights and resistors with different resistances are required, and especially for display areas with many colors, a large number of backlights and resistors need to be purchased for each color of display area, which undoubtedly increases the raw material cost; on the other hand, the circuit board needs to be disassembled, assembled and welded for many times, so that the stability of the test is influenced, the operation is labor-consuming and time-consuming, and the test cost is increased.
In order to solve these problems, the present application provides a method for toning an instrument panel, which can tone each display area on the instrument panel 10, wherein the color of each display area on the instrument panel can be a relatively wide color such as red, green, yellow or blue (described in detail below and described by a target color name), and the color of each display area can be pure color or mixed color. Because each color is relatively wide, in order to achieve the final desired display effect of the instrument panel, the target color name corresponding to each display area is provided with a color coordinate range, and the color coordinate range may include one target color coordinate or a plurality of target color coordinates.
As shown in fig. 3, the toning method for a single display area includes the steps of:
s100: and determining the initial printing color of the corresponding single-color printing area on the backlight picture according to the target color name of the display area to be color-mixed, and printing the backlight picture to obtain a first sample of the backlight. Wherein the initial print color is determined according to a preset color name, the preset color name being defined by CMYK preset values.
The target color name may include red, green, yellow, and blue, which are derived from basic design requirements of a manufacturer or a designer, and is a rough requirement for color if a certain display area wants to display red, and is a broader color expression, for example, the target color name red may include specific colors such as dark red, bright red, or pink, and RGB and color coordinate values of the specific colors are all different. The manufacturer or designer may set a wide color requirement according to the industry's specifications or regulations, such as displaying in red in the display area for prompting a very serious condition, displaying in yellow in the display area for prompting a general serious condition, displaying in green in the display area for prompting turning on or off, etc., and the color coordinates of the display in the actual display area may be adjusted according to their respective requirements.
Specifically, before step S100, a plurality of preset color names, such as red, green, yellow, blue, etc., may be set in advance, where the preset color names include target color names, and each preset color name is provided with specific CMYK preset values, such as CMYK preset values of red being M100, Y100, CMYK preset values of green being C70, Y100, CMYK preset values of yellow being Y100, CMYK preset values of blue being C100, CMYK preset values of deep blue being C100, M80, where a limited value of the XMYK preset values of the above colors is 0. The initial printing color can directly select a specific color with a preset color name completely consistent with the target color name, namely the CMYK value of the initial printing color is the corresponding CMYK preset value; the initial printing color may also be adjusted according to a specific color of a preset color name completely consistent with the target color name, that is, the CMYK values of the initial printing color are slightly adjusted values of C, M, or Y in the corresponding CMYK values, for example, the target color name is yellow, the CMYK preset value of the preset color name is yellow is Y100, and the other three are 0, then the CMYK values of the initial printing color may be selected to be Y100, and the other three are 0; alternatively, Y is 100, M is 20, C, and K is 0. Wherein, the preset color name can come from some specification standards of a manufacturing plant and the like.
S200: lighting a backlight source on an instrument panel assembled with the first sample, and testing to obtain an initial measurement color coordinate of a display area; that is, the backlight corresponding to the display area to be tested is turned on, and if the first display area 11 is tested, the first backlight is turned on, and at this time, the initial measurement color coordinates of the first display area 11 can be obtained through the test.
S300: judging whether the initial measurement color coordinate meets the color coordinate range required by the target color name or not, if so, finishing color mixing of the display area; if not, go to S400.
S400: and determining a coordinate to be color-mixed on the CIE chromaticity diagram according to the initial measured color coordinate and the color coordinate range, and determining the position of the coordinate to be color-mixed in the CIE chromaticity diagram.
As shown in fig. 4, in step S400, the initially measured color coordinates and the color coordinate range are respectively marked on the CIE chromaticity diagram, then the position of the coordinate to be color-mixed is determined according to the positions of the marked points, the color coordinate corresponding to the position is used as the coordinate to be color-mixed, that is, the specific color at the position is processed.
S500: the CIE chromaticity diagram is converted into a CMYK color domain, and divided into a plurality of unit patches, and the color of each unit patch is normalized, that is, the color of each unit patch is set to the same CMYK value, as shown in fig. 5.
That is, the CIE chromaticity diagram is converted entirely in the CMYK color gamut, that is, the conversion between the RGB color gamut and the CMYK color gamut is realized, and then the serpentine diagram of the CMYK gamut is divided into a plurality of unit color patches, and the CMYK values of each unit color patch are set to be the same, so that the specific color in each unit color patch corresponds to a unique CMYK value.
S600: and determining a unit color block at which the coordinate to be toned is positioned as a block to be toned, determining a standard color block closest to the color of the unit color block from CMYK standard color cards of the printing equipment, and taking the standard color block as a selected color block, wherein the CMYK standard color cards comprise a plurality of standard color blocks printable by the printing equipment.
Specifically, after the CIE chromaticity diagram is converted into the CMYK domain, the coordinate to be toned also corresponds to a unit color block in the converted serpentine diagram, as shown in fig. 4 and 5, the point a determined in the CIE chromaticity diagram is the position of the coordinate to be toned, and then in the CMYK domain of fig. 5, it can be seen that a is located in the unit color block B, and therefore, the unit color block B is the block to be toned.
For each printing device, the specific colors that can be printed are actually limited, each of the specific colors that can be printed is called a standard patch, and these standard patches are combined together to be called a CMYK standard patch, that is, the CMYK standard patch of each printing device includes a plurality of standard patches, as shown in fig. 6, the CMYK standard patch includes a patch of two-color mixture (i.e., two of CMY are mixed), and a patch of three-color mixture (i.e., CMY are mixed at the same time), for example, the three patches from the top to the right are a patch of CM mixture, a patch of MY mixture, and a patch of CY mixture, the lower patch is a patch of 100 of CMY from the left, and is mixed with two other patches of different values, the three patches from the top to the right are a patch of C100 and MY mixture, a patch of M100 and CY, and a patch of Y100 and CM in sequence, and the standard patches of these patches are arranged in a manner of 10 increments, and the values of the color patches below are the first patch of C and the standard patches of Y100 and the color patches are different values. Each standard patch has clear CMYK values, and when a certain print area is set to the CMYK values of the standard patch, the printed color substantially coincides with the color of the standard patch, and the specific color printed substantially coincides with the specific color of the standard patch. In fact, there is often a color difference between the colors of the standard patches printed by different printing devices, so it is preferable that each printing device is printed with a CMYK standard color card, as shown in fig. 10, which is a picture of the CMYK standard color card actually printed by one printing device.
After the CIE chromaticity diagram is directly converted into CMYK domains, the specific colors of the unit color blocks are not necessarily the same as the specific colors which can be printed by printing equipment, and therefore, in the invention, the color blocks to be toned are compared with the standard color blocks of the CMYK standard color card, the standard color blocks which are closest to the specific colors of the color blocks to be toned are selected and serve as the selected color blocks. If the color block to be adjusted is the unit color block B, the specific colors of the unit color block B and the standard color blocks are compared, and if the specific color of the standard color block C is considered to be the closest, the standard color block C is taken as the selected color block, refer to fig. 5 and 6.
S700: and printing the monochrome printing area according to the CMYK value of the selected color block by using printing equipment to obtain a second sample of the backlight piece, installing the second sample on an instrument panel, lighting the backlight source, and testing to obtain a sample measurement color coordinate of the display area. That is, the backlight corresponding to the display area to be tested is turned on, and if the first display area 11 is tested, the first backlight is turned on, and at this time, the sample measurement color coordinates of the first display area 11 can be obtained through the test.
S800: judging whether the measured color coordinates of the sample meet the requirement of the color coordinate range required by the target color name, if so, finishing color mixing of the display area; if not, selecting a standard color block adjacent to the previous selected color block on the CMYK standard color card as a new selected color block, and returning to the step S700; wherein the new selected color block does not include the selected color block of each previous time. That is, for the toned display area, it is determined whether the measured color coordinates of the sample conform to the color coordinate range of the display area, if so, the toning for the display area is finished, and the CMYK values of the printing area on the backlight corresponding to the display area are set as the CMYK values of the last selected color patch for subsequent printing of the backlight product (described in detail below); if not, color matching needs to be continued, at this time, a new selected color block is selected from the standard color blocks again, which may be the standard color block next to the previous selected color block (i.e., the standard color block with the adjacent side to the previous selected color block), or may be the standard color block spaced by one row or one column from the previous selected color block, but the newly selected color block is not repeated with any previous selected color block, and then the step S700 is returned, i.e., the backlight is printed again for testing.
The invention provides a color mixing method of a dashboard display area, which adjusts the display effect of the display area by adjusting the color of a monochromatic printing area on a backlight chip, adjusts the color of the monochromatic printing area into the color of a standard color block which can be printed by a printing device, and lights the backlight source to perform the color mixed display effect during testing, namely, the finally selected color of the backlight chip during design is consistent with the color printed at the end actually, and the state of the dashboard during testing is the same as the state during actual use, therefore, the finally obtained display effect by debugging is inevitably closer to the display effect of a final product, as shown in figure 9, the dashboard can better adapt to other interior trim of a vehicle, and the overall effect of the interior trim of the vehicle is improved; the color matching method does not need to purchase backlight sources of a plurality of manufacturers and exchange different resistors for testing, so that the cost of raw materials can be greatly reduced, and the influence of frequently modifying the circuit board on the testing effect can be reduced. Meanwhile, in the color mixing process, the designed RGB color is not directly used for printing, the RGB color domain is converted into a CMYK color domain, the CMYK color domain is divided into a plurality of unit color blocks, the colors of the unit color blocks are normalized, so that the unit color blocks have the same color, namely the same CMYK value, the selected unit color blocks are compared with the colors which can be printed by the printing equipment, the CMYK value of the color which can be printed by the printing equipment is used as the CMYK value of the unit monochrome printing area, namely, the color which can be printed by the printing equipment is directly selected as the color of the monochrome printing area, so that the color difference between the designed RGB color and the converted CMYK color and the color which can be printed by the printing equipment is avoided, the color deviation between the designed backlight piece and the actually printed backlight piece is improved, and the difference between the display effect of the designed display area and the actual display effect is further reduced.
In addition, the steps S100 to S800 are all for toning the same display area. In the present invention, the steps are not limited to be executed in the order of numbers, and the execution sequence of each step is specifically determined according to the content of each step, for example, step S500 may be executed before step S400, or may be executed after step S400, as long as it is executed before step S600.
The above toning method is described below by way of example of toning the first display area 11, where the name of the target color of the first display area 11 is green, and the required color coordinate range includes four color coordinates: (0.12, 0.67), (0.12, 0.75), (0.23, 0.67). The name of the preset color is green, and the corresponding CMYK preset values are C70 and Y100. The area of the first display area 11 corresponding to the backlight 20 is the first monochrome printing area 21, and the corresponding backlight source is the first backlight source, so that the following color adjustments for the monochrome printing areas are performed for the first monochrome printing area 21, that is, the CMYK values of the first monochrome printing area 21 are adjusted; the backlight that was lit up at the time of the test was the first backlight. The specific toning method comprises the following steps:
s100: the initial printing color is determined according to the CMYK preset values of the preset color name green, for example, the CMYK preset values of green can be directly used as the initial printing color, that is, the initial printing color is set to C70, Y100, and the rest is 0. And then printing a backlight picture to obtain a first sample. Of course, the preset values of C, M, and Y may be adjusted to be used as the initial printing colors; when only one target color coordinate is set, C70, Y100 and CMYK values after adjustment may be simultaneously selected as the initial print colors, respectively.
S200: the first sample is assembled on the instrument panel, the first light source is illuminated, and the test results in an initial measured color coordinate, such as (0.1625, 0.7354).
S300: respectively marking each target color coordinate and each initial measurement color coordinate on a CIE chromaticity diagram, and judging whether the distance between any one target color coordinate and the initial measurement color coordinate is within a preset range, if so, finishing color mixing of the first display area; if not, step S400 is executed. As shown in fig. 4, a (0.23, 0.75), A2 (0.23, 0.67), A3 (0.12, 0.75), and A4 (0.12, 0.67) are four target color coordinates, A0 (0.1625, 0.7354) is the above-mentioned initial measured color coordinate, and the distances between A1, A2, A3, and A4 and A0 are all out of the preset range, so that the color matching of the first display area 11 is not completed, and the process proceeds to step S400.
S400: the target color coordinate closest to the initially measured color coordinate A0 is selected on the CIE chromaticity diagram, and referring to fig. 4, it is apparent that the distance between A3 and A0 is the smallest, and thus the target color coordinate A3 is selected as the coordinate to be toned.
S500: the CIE chromaticity diagram is converted into a CMYK color domain, and is divided into a plurality of unit patches, and the colors of each unit patch are normalized as shown in fig. 5.
S600: with continued reference to fig. 5, the coordinate A0 to be toned is also correspondingly displayed in the CMYK color domain after the normalization process, so that the unit color block where the coordinate A0 to be toned is located can be determined, which is shown as a unit color block B in the figure. The color of the unit patch B is then compared with the unit patch colors in the CMYK standard color card, and the unit patch having the closest color to the unit patch B is taken as the selected patch. If the CMYK values of the unit color patch B in the CMYK color domain are determined, and then the selected color patch is determined in the CMYK standard color patch according to the larger two of the CMY, if the color of the unit color patch B in fig. 5 is C71, Y100, M, and K are all 0, the color patch is approximately at the white circle in the CMYK standard color patch in fig. 6, and therefore, the standard color patch Q0 may be selected as the selected color patch.
S700: and printing the first monochromatic printing area 21 by using C71, Y100, M and K which are all 0 to obtain a second sample, lighting the first backlight source, and testing to obtain the sample measurement colorimetric coordinates of the first display area 11.
S800: judging whether the color coordinate measured by the sample meets the requirement of the color coordinate range, specifically according to the judgment mode provided by any embodiment, if so, finishing the color mixing of the first display area; if not, the standard color block adjacent to the previously selected color block may be selected as a new selected color block, for example, the standard color block Q1, Q2, Q3, or Q4 is selected, and then the process returns to step S700.
It can be seen that in the toning method of the present invention, only the loop of steps S700, S800 is required to substantially determine the final print color (i.e., CMYK value) of the first monochrome print zone 21 on the backlight.
In an alternative embodiment, several standard color patches may be simultaneously selected as the selected color patches in steps S600 and S800, and then tested after being printed in step S700.
Specifically, the initial measured color coordinate or the sample measured color coordinate and each target color coordinate may be marked in a CIE chromaticity diagram, and whether the distance between the initial measured color coordinate or the sample measured color coordinate and the target color coordinate is within a preset range (i.e., whether there is a group of initial measured color coordinates or the distance between the sample measured color coordinate and the target color coordinate is within the preset range) is determined, if yes, the color coordinate range requirement is satisfied, and the color mixing of the display area is finished; if not, step S400 is executed or a new selected color block is reselected, and the process returns to step S700.
Specifically, when the color coordinate range includes one target color coordinate, only one initial print color may be set in step S100, printing one first sample. In this way, in step S300, if the initial measured color coordinate of the first sample is equal to the target color coordinate or the middle distance is within the preset range, the color matching for the display area is finished; if the distance between the initial measured color coordinate and the target color coordinate exceeds a preset range, determining a coordinate to be toned, selecting a certain color coordinate between the initial measured color coordinate and the target color coordinate as the coordinate to be toned, and also directly selecting the initial measured color coordinate as the coordinate to be toned.
In order to determine the coordinates to be toned more accurately in the subsequent steps and reduce the number of cycles of the toning method, a plurality of initial printing colors are preferably set in step S100, so that a plurality of first samples of the backlight sheet can be obtained. Specifically, the step S100 includes the steps of:
s111: selecting CMYK preset values defined by preset color names consistent with the target color name as basic colors;
s112: adjusting at least one of C, M, and Y of the basic color by a preset amount to obtain an adjusted color, for example, adjusting only the value of C, M, or Y, or adjusting the value of C, M, or adjusting the value of C, Y, or adjusting the value of M, Y, or adjusting the value of C, M, and Y simultaneously, so as to obtain a plurality of adjusted colors, where the specific number may be one adjusted color, two adjusted colors, or multiple adjusted colors.
S113: and respectively taking the basic color and the adjusting color as initial printing colors of the monochromatic printing area, and printing the backlight picture to obtain a plurality of first samples of the backlight piece, namely, respectively setting CMYK values of the monochromatic printing area as the basic color and the adjusting color, and then printing the backlight piece, thus obtaining a plurality of first samples.
In this embodiment, in step S200, a plurality of initial measured color coordinates are obtained, that is, in this step, each first sample is mounted on the instrument panel and then tested, so as to obtain the initial measured color coordinates corresponding to the first sample.
Correspondingly, in the step S300, as long as the distance between one initial measured color coordinate and the target color coordinate on the CIE chromaticity diagram is within the preset range, the initial measured color coordinate is considered to meet the requirement of the color coordinate range; and if the distance between any initial measured color coordinate and the target color coordinate on the CIE chromaticity diagram is outside the preset range, the initial measured color coordinate is considered to not meet the requirement of the color coordinate range. Specifically, each initial measured color coordinate and each target color coordinate may be respectively marked on the CIE chromaticity diagram, and then it is determined whether the distance between each initial measured color coordinate and each target color coordinate is less than or equal to a preset range, if at least one distance between one initial measured color coordinate and each target color coordinate is less than or equal to the preset range, the initial measured color coordinate is considered to satisfy the requirement of the color coordinate range, and the color matching for the display area is finished; if the distance between any initial measured color coordinate and the target color coordinate is greater than the preset range, the initial measured color coordinate is considered not to satisfy the requirement of the color coordinate range, and step S400 is executed.
In this embodiment, the method for determining the coordinates to be toned in step S400 includes: and selecting the initial measured color coordinate closest to the target color coordinate as the coordinate to be toned, namely selecting which initial measured color coordinate on the CIE chromaticity diagram has the smallest distance with the target color coordinate, and then selecting which initial measured color coordinate as the coordinate to be toned.
In step S800, it is determined whether the sample measured color coordinate meets the requirement of the color coordinate range required by the target color name, or the determination method in step S300 is adopted, and only the initial measured color coordinate is replaced by the sample measured color coordinate, that is, as long as the distance between the sample measured color coordinate and the target color coordinate on the CIE chromaticity diagram is within the preset range, the sample measured color coordinate is considered to meet the requirement of the color coordinate range; and if the distance between the measured color coordinate of any sample and the target color coordinate on the CIE chromaticity diagram is outside the preset range, determining that the measured color coordinate of the sample does not meet the requirement of the color coordinate range.
In step S300, when the color matching of the display area is finished, if only one set of the distances between the initial measured color coordinates and the target color coordinates is less than or equal to the preset range, taking the CMYK values of the monochrome printing area on the first sample corresponding to the initial color coordinates as the CMYK values of the monochrome printing area on the finished backlight film; and if the distances between the plurality of initial measurement color coordinates and the target color coordinates are less than or equal to the preset range, selecting the CMYK value of the single-color printing area on the first sample corresponding to the initial measurement color coordinate with the minimum distance as the CMYK value of the single-color printing area on the finished backlight film. Similarly, when the color mixing of the display area is finished in step S800, if only one set of the measured color coordinates of the sample is less than or equal to the preset range from the target color coordinate, the CMYK values of the monochrome printing area on the second sample corresponding to the measured color coordinates of the sample are used as the CMYK values of the monochrome printing area on the finished backlight film; and if the distance between the multi-group sample measurement color coordinate and the target color coordinate is less than or equal to the preset range, selecting the CMYK value of the single-color printing area on the second sample corresponding to the sample measurement color coordinate with the minimum distance as the CMYK value of the single-color printing area on the finished backlight film.
When the color coordinate range includes a plurality of target color coordinates, a plurality of first samples may also be printed in the above manner, and a plurality of initial measured color coordinates are obtained in step S200; in step S300, a plurality of initial measured color coordinates are compared with each target color coordinate, and as long as a group of initial measured color coordinates is within a preset range of the distance from the target color coordinate, the toning of the display area is finished, and the initial printing color corresponding to the initial measured color coordinates in the group is used as the printing color of the corresponding monochrome printing area for the finished product printing. If the distance between any set of initial measured color coordinates and the target color coordinates is out of the preset range, the coordinates to be toned are determined first, and at this time, the initial measured color coordinates or the target color coordinates in the set of initial measured color coordinates and the target color coordinates with the closest distance can be selected as the coordinates to be toned.
In a preferred embodiment of the present invention, when a plurality of target color coordinates are included, only one first sample is printed, and specifically, S100 includes the steps of:
s120: and selecting CMYK preset values defined by preset color names consistent with the target color name as printing colors, and printing the backlight picture to obtain a first sample of the backlight.
In this embodiment, an initial measured color coordinate is obtained in step S200, that is, in this step, the obtained first sample is mounted on the instrument panel, and the display effect of the display area on the instrument panel is tested after the backlight corresponding to the display area is lit up, so as to obtain the initial measured color coordinate.
In step S300, as long as the distance between the initial measured color coordinate and one of the target color coordinates on the CIE chromaticity diagram is within the preset range, the initial measured color coordinate is considered to meet the requirement of the color coordinate range; and if the distance between the initial measurement color coordinate and any target color coordinate on the CIE chromaticity diagram is outside the preset range, the initial measurement color coordinate does not meet the requirement of the color coordinate range.
In this embodiment, the method for determining coordinates to be toned in step S400 includes: and selecting the target color coordinate closest to the initial measurement color coordinate as the coordinate to be toned.
In this embodiment, in step S800, it is determined whether the sample measured color coordinate satisfies the requirement of the color coordinate range required by the target color name, and the determination method in step S300 is also adopted, which is only to replace the initial measured color coordinate with the sample measured color coordinate, that is, as long as the distance between the sample measured color coordinate and one of the target color coordinates on the CIE chromaticity diagram is within the preset range, the sample measured color coordinate is considered to satisfy the requirement of the color coordinate range; and if the distances between the measured color coordinates of the sample and any target color coordinate on the CIE chromaticity diagram are outside the preset range, the measured color coordinates of the sample are considered to not meet the requirement of the color coordinate range.
By adopting the mode, the number of the first samples in the step S100 can be reduced, the assembling and measuring times of the samples in the step S200 can be reduced, the number of the initial measurement color coordinates and the target color coordinates in the steps S300 and S400 can be greatly reduced, the procedures of comparing and determining the coordinates to be color-mixed are simplified, and the color mixing efficiency of the whole display area can be improved.
In step S500, the CIE chromaticity diagram, i.e., the RGB color gamut, may be converted into the CMYK color gamut by Photoshop. In the conversion into the CMYK color domain, the cell patches may be manually divided and normalized by themselves, or the CMYK color domain may be divided into a plurality of cell patches by a mosaic function of Photoshop and the color of each cell patch may be normalized. Specifically, the size of the unit color patch may be set according to the need and resolution, such as 5 pixels when using the mosaic function of Photoshop.
In step S600, when the coordinate to be toned is located on a side line of the unit color block, any unit color block with the side line is selected as a block to be toned; and when the coordinate to be toned is positioned in the side line of the unit color block, selecting the unit color block as the block to be toned.
In step S600, in the CMYK standard color chart, as for the determination method of the selected color block, the visible color can be visually compared, and the standard color block with the closest color can be selected. In the embodiment of using Photoshop to convert to CMYK color gamut, the CMYK values of the cell patches may be directly picked up and then compared with the CMYK of each standard patch in the CMYK standard color card, thereby selecting the closest standard patch. In a specific implementation, there may not be a standard patch that completely corresponds to the CMY values of the patch to be toned, and therefore, in a preferred embodiment of the present invention, determining the selected patch includes the steps of:
s601: determining the C, M, Y and K values of the unit color blocks;
s602: the position of the unit color block on the CMYK standard color card is determined according to the larger values of the C, M and Y of the unit color block, and the standard color block closest to the position is selected as the selected color block.
Specifically, each standard color block includes an edge line and an inner region located within the edge line; the determination method for selecting the color patch in step S602 includes:
if the position point determined by the larger two values of C, M and Y of the color block to be mixed is positioned in the inner area of one standard color block, selecting the standard color block where the position point is positioned as the selected color block;
and if the position point determined by the larger two values of C, M and Y of the color block to be mixed is positioned on the side line of the standard color block, selecting any standard color block where the side line is positioned as the selected color block.
In step S800, one standard color patch adjacent to the previous selected color patch includes a standard color patch having a common edge with the previous selected color patch, a standard color patch spaced by one column or one row from the previous selected color patch, or a standard color patch spaced by two columns or two rows from the previous selected color patch. In this way, the range of possible standard color blocks is expanded as much as possible, so that the color matching of the display area is more accurate.
In one embodiment, in step S800, if the requirement for the color coordinate range is farther and farther in the multiple loop tests, the selected color block closest to the color coordinate range is selected as the new selected color block, and the process returns to step S700; and when the backlight sheet is printed in the step S700, the monochrome printing area is printed for a plurality of times by using the printing device according to the CMYK values of the selected color patches, and the transparency of the monochrome printing area printed for each time is different. That is, when the CMYK values of the monochrome printing area are adjusted multiple times, and the CMYK values still cannot meet the requirement of the color coordinate range, and are further away from the requirement, that is, the distance between the measured color coordinate of any one set of samples and the target color coordinate is not within the preset range, the monochrome printing area may be printed multiple times, and the transparency of the monochrome printing area may be adjusted each time, so as to reduce the distance between the measured color coordinate of the sample and the target color coordinate as much as possible, and improve the efficiency of color mixing for the display area.
In the manufacturing of the instrument panel, a manufacturer or a customer usually provides which indicator lamps, warning lamps, etc. are required to be displayed on the instrument panel, and there are color requirements specified by the industry or regulations for different indicator lamps and warning lamps as described above, based on which in a preferred embodiment of the present invention, the target color name may be determined according to the display requirements of the indicator lamps or warning lamps, and specifically, step S100 further includes:
s001: determining the display color of a display area corresponding to the indicator lamp or the alarm lamp according to the display requirement of the indicator lamp or the alarm lamp required by the instrument panel, taking the name of the display color as a target color name, determining the initial color of a monochrome printing area corresponding to the display area on the backlight picture according to the target color name, wherein the CMYK value of the initial color is a CMYK preset value limited by a preset color name consistent with the target color name;
s002: printing a monochrome printing area by using printing equipment according to the CMYK value of the initial color to obtain a primary sample of the backlight piece;
s003: lighting a backlight source of the instrument panel assembled with the primary sample, judging whether the display effect of the display area meets the requirement of the interior trim of the vehicle, and if so, finishing the color mixing of the display area; if not, determining the color coordinate range corresponding to the target color name according to the current display effect and the vehicle interior requirement, and executing the step S100.
In the embodiments of the above-mentioned color matching methods, the same display area on the instrument panel is subjected to color matching, the CMYK values of the same monochrome printing area on the backlight sheet are adjusted in the whole step, the same backlight is lighted in the test, and the display area, the monochrome printing area and the backlight are corresponding, that is, after the instrument panel is assembled, the three areas are located at the same position when viewed from the thickness direction of the instrument panel. Further, the color matching method is adopted for color matching of each display area on the instrument screen, and when the color matching of each display area is finished, the CMYK value of the single-color printing area of the second sample in the final test is used as the CMYK value of the single-color printing area on the backlight sheet to be used for printing a finished backlight sheet.
The display area comprises a monochromatic color area, a first end color area of the gradient color area or a second end color area of the gradient color area. The monochrome color area may be a solid color area in which only one of CMY values is not 0, a two-color mixing area in which only two values are not 0, or a three-color mixing area in which all three values are not 0.
The present invention also provides a method for manufacturing a backlight sheet for an instrument panel of an automobile, as shown in fig. 7, comprising the steps of:
s10: carrying out color matching on each display area of the instrument panel according to any one of the color matching methods;
s20: and printing the backlight picture by using printing equipment according to the CMYK value of the single-color printing area determined at the end of color mixing to obtain the backlight.
The color matching method is adopted to match colors for each display area, CMYK values of each single-color printing area on the backlight sheet are determined, then the printing equipment used in the color matching method is selected to print the backlight sheet, and therefore the approach degree of the test process and the display effect in a finished product is further improved.
In addition, the invention also provides a backlight sheet for an automobile instrument panel, and the backlight sheet is manufactured by using the manufacturing method of any one of the embodiments.
The invention also provides an automobile instrument panel which comprises the backlight sheet, certainly, the instrument panel also comprises a backlight source and a segment code liquid crystal panel, wherein the segment code liquid crystal panel is provided with a plurality of controllable light transmission areas, and each controllable light transmission area corresponds to one display area on the instrument panel. The backlight sheet is positioned between the backlight source and the segment code liquid crystal panel and is attached to the back of the segment code liquid crystal panel.
It will be appreciated by those skilled in the art that the various preferences described above can be freely combined, superimposed without conflict.
It should be noted that the step numbers (letter or number numbers) are used to refer to some specific method steps in the present invention only for the purpose of convenience and brevity of description, and the order of the method steps is not limited by letters or numbers in any way. It will be clear to a person skilled in the art that the order of the steps of the method concerned, which is to be determined by the technique itself, should not be unduly limited by the presence of step numbers, and that a person skilled in the art can determine various permissible and reasonable orders of steps in accordance with the technique itself.
It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.

Claims (12)

1. A color matching method for an automobile instrument panel comprises a backlight source, a segment code liquid crystal panel and a backlight piece, wherein the backlight piece is positioned between the backlight source and the segment code liquid crystal panel and is attached to the back side of the segment code liquid crystal panel; the method for color matching is characterized by comprising the following steps:
s100: determining an initial printing color of a corresponding single-color printing area on a backlight picture according to a target color name of a display area to be color-mixed, and printing the backlight picture to obtain a first sample of the backlight; the initial printing color is determined according to a preset color name, and the preset color name is limited with CMYK preset values;
s200: lighting a backlight source on an instrument panel assembled with the first sample, and testing to obtain an initial measurement color coordinate of the display area;
s300: judging whether the initial measurement color coordinate meets the color coordinate range required by the target color name, if so, finishing the color matching of the display area; if not, executing the step S400;
s400: determining a coordinate to be color-mixed on a CIE chromaticity diagram according to the initial measurement color coordinate and the color coordinate range, and determining the position of the coordinate to be color-mixed in the CIE chromaticity diagram;
s500: converting the CIE chromaticity diagram into a CMYK color domain, dividing the CMYK color domain into a plurality of unit color blocks, and normalizing the color of each unit color block to form a color block to be mixed;
s600: determining a unit color block where the coordinate to be toned is located as a block to be toned, determining a standard color block which is closest to the color of the unit color block in a CMYK standard color card of printing equipment, and taking the standard color block as a selected color block;
s700: printing the monochrome printing area by using the printing equipment according to the CMYK value of the selected color block to obtain a second sample of the backlight piece, installing the second sample of the backlight piece on an instrument panel, lighting the backlight source, and testing to obtain a sample measurement color coordinate of the display area;
s800: judging whether the sample measured color coordinate meets the requirement of the color coordinate range required by the target color name or not, if so, finishing the color mixing of the display area; if not, selecting a standard color block adjacent to the previous selected color block on the CMYK standard color card as a new selected color block, and returning to the step S700; wherein the new selected color block does not comprise the selected color block of each previous time;
wherein, before the step S100, the method further includes:
s001: determining the display color of a display area corresponding to an indicator lamp or a warning lamp according to the display requirement of the indicator lamp or the warning lamp required by an instrument panel, taking the name of the display color as a target color name, determining the initial color of a monochrome printing area corresponding to the display area on the backlight picture according to the target color name, wherein the CMYK value of the initial color is a CMYK preset value defined by a preset color name consistent with the target color name;
s002: printing the monochrome printing area according to the CMYK value of the initial color by using the printing equipment to obtain a primary sample of the backlight piece;
s003: and lighting a backlight source of the instrument panel assembled with the primary sample, judging whether the display effect of the display area meets the requirement of the vehicle interior trim, if not, determining the color coordinate range corresponding to the target color name according to the current display effect and the requirement of the vehicle interior trim, and executing the step S100.
2. A toning method according to claim 1, characterised in that the colour coordinate range comprises one target colour coordinate;
the step S100 includes the steps of:
s111: selecting CMYK preset values defined by preset color names consistent with the target color name as basic colors;
s112: adjusting at least one of C, M and Y of the basic color by a preset amount to obtain an adjusted color;
s113: respectively taking the basic color and the adjusted color as initial printing colors of the monochrome printing area, and printing the backlight picture to obtain a first sample of a plurality of backlight pictures;
a plurality of initial measurement color coordinates are obtained in the step S200;
in the above-mentioned step S300, the user can select,
as long as the distance between one initial measurement color coordinate and the target color coordinate on the CIE chromaticity diagram is within a preset range, the initial measurement color coordinate meets the requirement of the color coordinate range; if the distance between any initial measured color coordinate and the target color coordinate on the CIE chromaticity diagram is outside a preset range, the initial measured color coordinate does not meet the requirement of the color coordinate range;
the method for determining the coordinates to be toned in the step S400 includes: and selecting the initial measurement color coordinate closest to the target color coordinate as the coordinate to be toned.
3. A toning method according to claim 1, wherein the color coordinate range includes a plurality of target color coordinates;
the S100 includes the steps of:
s120: selecting CMYK preset values defined by preset color names consistent with the target color name as printing colors, and printing a backlight picture to obtain a first sample of the backlight;
an initial measurement color coordinate is obtained in the step S200;
in the above-mentioned step S300, the user can select,
as long as the distance between the initial measurement color coordinate and one of the target color coordinates on the CIE chromaticity diagram is within a preset range, the initial measurement color coordinate meets the requirement of a color coordinate range; if the distance between the initial measurement color coordinate and any target color coordinate on the CIE chromaticity diagram is outside a preset range, the initial measurement color coordinate does not meet the requirement of a color coordinate range;
the method for determining the coordinates to be toned in the step S400 includes: and selecting the target color coordinate closest to the initial measurement color coordinate as a coordinate to be color-mixed.
4. The toning method according to claim 1, wherein in the step S600, determining the selected color block includes the steps of:
s601: determining the C, M, Y and K values of the color block to be adjusted;
s602: and determining the positions of the color blocks to be adjusted on the CMYK standard color card according to the larger values of the C, M and Y of the color blocks to be adjusted, and selecting the standard color block closest to the position as the selected color block.
5. The toning method according to claim 4, wherein each standard color block includes an edge line and an inner region located at the edge line; the determining method of the selected color block in step S602 includes:
if the position point determined by the larger two values of C, M and Y of the color block to be adjusted is positioned in the inner area of one standard color block, selecting the standard color block where the position point is positioned as the selected color block;
and if the position point determined by the larger two values in the C, M and Y of the color block to be adjusted is positioned at the side line of the standard color block, selecting any standard color block positioned at the side line as the selected color block.
6. The method for adjusting color of claim 1, wherein in step S800, the standard color blocks adjacent to the previous selected color block include a standard color block having a common edge with the previous selected color block, a standard color block spaced by one column or one row from the previous selected color block, or a standard color block spaced by two columns or two rows from the previous selected color block.
7. A toning method according to claim 6, wherein in the step S800, if the requirement for the color coordinate range is farther and farther in the multiple-cycle test, the selected color block closest to the color coordinate range is selected as a new selected color block, and the process returns to the step S700;
when the backlight sheet is printed in the step S700, the monochrome printing area is printed by the printing device for multiple times according to the CMYK values of the selected color patch, and the transparency of the monochrome printing area is different for each printing.
8. A toning method according to any one of claims 1 to 7, wherein the monochrome print zone comprises a monochrome-coloured zone, a first end-coloured zone of a gradient-coloured zone or a second end-coloured zone of a gradient-coloured zone.
9. A shading method according to any one of claims 1 to 7, wherein the target color names include red, green, yellow, blue.
10. A method for manufacturing a backlight sheet for an instrument panel of an automobile, comprising the steps of:
s10: toning each display area of the instrument panel according to the toning method according to any one of claims 1 to 9;
s20: and printing the backlight picture by using the printing equipment according to the CMYK value of the single-color printing area determined at the end of color mixing to obtain the backlight.
11. A backlight for an automobile instrument panel, characterized in that the backlight is manufactured using the manufacturing method of claim 10.
12. An automobile instrument panel comprising the backlight of claim 11.
CN202210405984.6A 2022-04-18 2022-04-18 Color matching method of automobile instrument panel and manufacturing method of backlight piece Active CN114801737B (en)

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