HK1112685A1 - A color matching method for light emitting diode - Google Patents
A color matching method for light emitting diode Download PDFInfo
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- HK1112685A1 HK1112685A1 HK08107825.8A HK08107825A HK1112685A1 HK 1112685 A1 HK1112685 A1 HK 1112685A1 HK 08107825 A HK08107825 A HK 08107825A HK 1112685 A1 HK1112685 A1 HK 1112685A1
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Abstract
The invention relates to a color matching method for an LED, which comprises a first monochrome LED, a second monochrome LED and a third monochrome LED. The method comprises the following steps: when the three monochrome LEDs are used for synthesizing a target color, the brightness of the three monochrome LEDs are respectively Y1', Y2' and Y3', which meet the following relation expressions of the brightness: Y2'=Y1' is multiplied by K2 and Y3'=Y1' is multiplied by K3. A monochrome LED in the three LEDs is selected as a standard and the brightness of the monochrome LED remains unchanged when the target color is synthesized. According to the relation expressions of the brightness of the three monochrome LEDs, which are adopted in synthesizing the target color, the brightness of the other two monochrome LEDs are adjusted for obtaining the target color. The invention also provides a color matching method for the LED with two chromatic lights. The color matching method for the LED is simple with great convenience.
Description
Technical Field
The invention relates to a color matching method of a Light Emitting Diode (LED).
Background
In the color matching process of the light emitting diode in the prior art, the light emitting diodes with all colors are lightened. For example, for three-color (or two-color) light emitting diodes, all three-color (or two-color) light emitting diodes are lighted, then synthesized color coordinates are measured, and then calibration is carried out according to the obtained color coordinates and national standards.
Disclosure of Invention
In order to overcome the defects of slow color matching speed and complex color matching process of the light-emitting diode in the prior art, the invention provides a simple and quick color matching method of the light-emitting diode.
In order to solve the technical problem, a color matching method for a light emitting diode is provided, wherein the light emitting diode comprises a first monochromatic light emitting diode and a second monochromatic light emitting diodeA light emitting diode and a third monochromatic light emitting diode, wherein the color coordinate and the brightness coordinate of the three monochromatic light emitting diodes are respectively (x)1，y1，Y1)，(x2，y2，Y2) And (x)3，y3，Y3) Wherein Y is1，Y2，Y3The original brightness of the monochromatic light-emitting diode and the color coordinate (x) of the target color to be synthesized4，y4，Y4) The method comprises the following steps: when the three monochromatic light-emitting diodes are used for synthesizing the target color, the brightness of the first monochromatic light-emitting diode, the brightness of the second monochromatic light-emitting diode and the brightness of the third monochromatic light-emitting diode are respectively Y1’，Y2’，Y3', which satisfies the following luminance relation: y is4＝Y1’+Y2’+Y3’，Y2’＝Y1’×K2，Y3’＝Y1’×K3Wherein, in the step (A),
selecting one of the three monochromatic LEDs as standard, and making the selected monochromatic LED maintain the original brightness when synthesizing the target color, i.e. Y1’＝Y1Or Y2’＝Y2Or Y3’＝Y3(ii) a And adjusting the brightness of the other two monochromatic light-emitting diodes according to the brightness relational expression of the three monochromatic light-emitting diodes when the target color is synthesized so as to obtain the target color.
An improved technical scheme is as follows: the color matching method further comprises providing a software interface for inputting the color coordinates and brightness coordinates of the three monochromatic LEDs respectively as (x)1，y1，Y1)，(x2，y2，Y2) And (x)3，Y3，Y3) Of the target colour to be synthesizedColor coordinate (x)4，y4) Then, according to the brightness relation formula, the software directly gives the brightness needed to be set by the three monochromatic light-emitting diodes.
In order to solve the above technical problem, there is also provided a color matching method for a light emitting diode, wherein the light emitting diode comprises a first monochromatic light emitting diode and a second monochromatic light emitting diode, and the color coordinate and the brightness coordinate of the two monochromatic light emitting diodes are (x) respectively1，y1，Y1) And (x)2，y2，Y2) Wherein Y is1，Y2All are the original brightness of the monochromatic LED, the color coordinate and brightness (x) of the target color to be synthesized4，y4，Y4) The method comprises the following steps: when the target color is synthesized by the two monochromatic light-emitting diodes, the brightness of the first monochromatic light-emitting diode and the brightness of the second monochromatic light-emitting diode are respectively Y1’，Y2', which satisfies the relation: y is4＝Y1’+Y2’，Y2’＝Y1’×K2WhereinOrSelecting one of the two monochromatic LEDs as a standard, and when synthesizing the target color, keeping the original brightness of the selected monochromatic LED unchanged, namely Y1’＝Y1Or Y2’＝Y2(ii) a And adjusting the brightness of the other one of the single-color light-emitting diodes according to the brightness relation formula of the two single-color light-emitting diodes when the target color is synthesized so as to obtain the target color.
An improved technical scheme is as follows: the color matching method further comprises providing a software interface for inputting the color coordinates and brightness coordinates of the two monochromatic LEDs respectively as (x)1，y1，Y1)，(x2，y2，Y2) And the color coordinates x of the target color to be synthesized4Or y4Then, according to the brightness relation formula, the software directly gives the brightness needed to be set by the two single-color light-emitting diodes.
Compared with the prior art, in the color matching method of the light-emitting diode, when three monochromatic light-emitting diodes are subjected to color matching, the original brightness of one monochromatic light-emitting diode is kept unchanged, and only the brightness of the other two monochromatic light-emitting diodes is required to be adjusted; when two kinds of monochromatic light-emitting diodes are matched, one kind of monochromatic light-emitting diode is also keptThe original brightness is not changed, and only the brightness of another monochromatic light-emitting diode needs to be adjusted, so that the brightness of one monochromatic light-emitting diode is less adjusted than that of the color matching method in the prior art no matter three monochromatic light-emitting diodes are subjected to color matching or two monochromatic light-emitting diodes are subjected to color matching, and the color matching process can be saved. Moreover, in the situation that the brightness of one of the monochromatic light emitting diodes is kept unchanged, the brightness of other monochromatic light emitting diodes needing to be adjusted and the brightness of the monochromatic light emitting diodes with unchanged brightness are kept in a fixed relation, such as: y is2’＝Y1’×K2，Y3’＝Y1’×K3Therefore, the method is more accurate and more convenient than the method of adjusting for multiple times according to experience in the prior art.
In addition, a software interface can be provided for the color matching method, so as to input the color coordinates of the single-color light-emitting diodes, the corresponding original brightness and the color coordinates of the target color to be synthesized, and the software directly calculates and provides the brightness required to be configured when the single-color light-emitting diodes synthesize the target color according to the brightness relational expression, thereby further simplifying the color matching process.
Drawings
FIG. 1 is a schematic diagram of color matching of a three color light emitting diode according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of color matching of a two color light emitting diode according to a second embodiment of the present invention;
FIG. 3 is a schematic software interface provided by a color scheme for a three color light emitting diode according to a third embodiment of the present invention;
FIG. 4 is a software interface diagram provided by a color scheme for a two color light emitting diode according to a fourth embodiment of the present invention.
Detailed Description
The color matching method of the light-emitting diode firstly determines the conversion relation from the color coordinates of the monochromatic light-emitting diode to the color coordinates of the synthesized target color, obtains the proportional relation of the light intensities of various colors when the target color is synthesized by using the conversion relation, and calculates and synthesizes the light intensities of various colors with the maximum light intensity according to the proportional relation. The embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of color matching of three color light emitting diodes according to a first embodiment of the present invention. In this embodiment, the red, green and blue monochromatic light emitting diodes are synthesized into white light with a target color, as shown in fig. 1, the process can be divided into the steps of synthesizing the red light emitting diode and the green light emitting diode into an intermediate color C, and then synthesizing the intermediate color C and the blue light emitting diode into white light.
Let the color coordinates and brightness of the RGB LEDs be R (x)r，yr，Yr)，G(xg，yg，Yg)，B(xb，yb，Yb) The resultant intermediate color is C (x)c，yc，Yc) Finally, the target color, i.e. white, is synthesized, with the color coordinates and brightness W (x)w，yw，Yw). Y is abover，Yg，YbAre all synthesized to have a luminance of YwThe brightness of the individual LEDs, Yw＝Yr+Yg+Yb. According to the principle of colorimetry and the definition of the CIE1931 color diagram, when two colors of lights are mixed, the distance ratio of the coordinates of the colors to the combining point is equal to the inverse ratio of the quantity of the colors, and the red and the green are combined to form a color C: obtaining:
Yr+Yg＝Yc (3)
color C and blue combined target color white:
solving (1), (2), (3), (4) and (5) to obtain:
Yg＝Yg*Yr (6)
Yb＝Kb*Yr (8)
in addition, the first and second substrates are,
the brightness ratios of the red, green and blue LEDs when the target color is synthesized are as follows:
Yr∶Yg∶Yb＝1∶Kg∶Kb
moreover, due to xr，yr，xg，yg，xb，yb，xw，ywAre given a predetermined value, so that K can be derived from equations (7) and (11)gAnd KbAre determined values, so that the brightness ratios of the red, green and blue light emitting diodes are determined values when the target color is synthesized.
Suppose that the original three-color light intensity of red, green and blue is Yr0，Yg0，Yb0The color to be used as a standard is calculated according to the proportion:
M＝Min[Yr0/1，Yg0/Kg，Yb0/Kb](Min[a，b，c]is taken to mean the minimum of a, b, c), if Y isr0With a minimum of/1, then the following situation will be:
Yr＝M
Yg＝Kg*Yr
Yb＝Kb*Yr
therefore, the original brightness of the red light-emitting diode can be kept unchanged, the brightness values of the green light-emitting diode and the blue light-emitting diode can be obtained according to the brightness relation between the green light-emitting diode and the red light-emitting diode and the brightness relation between the blue light-emitting diode and the red light-emitting diode, and the aim of synthesizing the target color can be achieved by further adjusting the brightness of the green light-emitting diode and the blue light-emitting diode according to the values.
As mentioned above, the color matching method of the light emitting diode can keep the brightness of a single-color light emitting diode unchanged during color matching, and can accurately adjust the brightness of the other two single-color light emitting diodes according to the brightness proportional relation of the red, green and blue light emitting diodes during target color synthesis so as to achieve the purpose of target color synthesis. Compared with the prior art which needs to adjust the brightness of three monochromatic light-emitting diodes, the method saves the color matching process. Moreover, in the color matching process of the prior art, color matching is performed according to human experience, and the required target color may need to be synthesized repeatedly and repeatedly, and is not necessarily accurate.
Fig. 2 is a schematic diagram of color matching of a light emitting diode with two colors according to a second embodiment of the present invention. In this embodiment, the light emitting diodes of two color lights are a first single color light emitting diode and a second single color light emitting diode. Suppose thatThe color coordinates and brightness of one monochromatic light emitting diode and the second monochromatic light emitting diode are (x)1，y1，Y1) And (x)2，y2，Y2) Color coordinates and lightness (x) of the target color to be synthesized4，y4，Y4). Y is above1，Y2All are the original brightness of the monochromatic light emitting diode. Assuming that the two monochromatic light emitting diodes compose the target color, the first and second monochromatic light emitting diodes have brightness of Y1’，Y2', thus Y4＝Y1’+Y2'. According to the principle of colorimetry and the definition of the CIE1931 color diagram, when two colors of lights are mixed, the distance ratio of the coordinates of the colors to the combining point is equal to the inverse ratio of the quantity of the colors, and the red and the green are combined to form a color C: obtaining:
from the above equation Y can be derived2’＝K2*Y1', whereinOr
Can compare Y1And Y2/K2The size of (2) is based on the standard of selecting the monochromatic light emitting diode corresponding to the minimum value.
Similarly, the color matching method of the light emitting diode can keep the brightness of one monochromatic light emitting diode unchanged during color matching, and can accurately adjust the brightness of another monochromatic light emitting diode according to the brightness proportional relation of the first light emitting diode and the second monochromatic light emitting diode during target color synthesis so as to achieve the purpose of target color synthesis. Compared with the prior art which needs to adjust the brightness of two monochromatic light-emitting diodes, the method saves the color matching process. Moreover, in the color matching process of the prior art, color matching is performed according to human experience, and the required target color may need to be synthesized repeatedly and repeatedly, and is not necessarily accurate.
In the color matching method for various light emitting diodes, in order to obtain the brightness ratios of various single color light emitting diodes more conveniently and quickly, the invention provides software for executing the formula calculation, and the software provides an interface for inputting the color coordinates and the initial brightness of various single color light emitting diodes. Two embodiments are described below.
Fig. 3 is a schematic software interface diagram provided by a color scheme of a three-color light emitting diode according to a third embodiment of the present invention. In this embodiment, the software is an interface of the color coordinates and the initial brightness of three monochromatic leds. In this embodiment, the color matching method includes the following steps: the current of the red light-emitting diode is set to be 20mA, and the color coordinate and the brightness R (x, Y, Y) when the red light-emitting diode is independently lightened are measured; the current of the green light emitting diode is set to be 20mA, and the color coordinate and the brightness G (x, Y, Y) when the green light emitting diode is independently lightened are measured; the current of the blue light emitting diode is set to be 20mA, and the color coordinate and the brightness B (x, Y, Y) when the blue light emitting diode is independently lightened are measured; in the software interface shown in fig. 3, R (x, Y), G (x, Y), and B (x, Y) are respectively filled in the positions 1 to 9 on the left side of the software, and then color coordinates that we need to synthesize are set and filled in the boxes 10 and 11 (see fig. 3).
Then, pressing the key of "generate target brightness", the brightness values of the three color lamps can be obtained in the right frame of the software, wherein the brightness of one color is not changed. The set color can be synthesized by adjusting the driving current of the other two light-emitting diodes according to the value to change the brightness of the light-emitting diodes to obtain the brightness value output by the software, and the module brightness is the maximum brightness.
Fig. 4 is a schematic software interface diagram provided by a color scheme of a two-color led according to a fourth embodiment of the present invention. In this embodiment, the software is an interface of the color coordinates and the initial brightness of two types of monochromatic light emitting diodes. In this embodiment, the color matching method includes the following steps: the current of the LED of the color 1 is set to be 20mA, and the color coordinate and the brightness when the LED is independently lightened are measured to be the color 1(x, Y, Y); the current of the LED of color 2 is set to be 20mA, and the color coordinate and the brightness when the LED is independently lighted are measured to be color 2(x, Y, Y); and opening a two-color matching program, and filling the color 1(x, Y, Y) and the color 2(x, Y, Y) into the boxes of the software No. 1-6 (as shown in the figure 4). To obtain good performance, the x-coordinate of the target color coordinates may be obtained in the following manner. Taking red and green to yellow as an example, the color coordinates of red and green colors are marked in a color coordinate graph, the two color coordinates are connected by a straight line and intersect with an industry standard yellow area at two points (as shown in figure 2), and the x coordinate of the middle point of the two intersection points is read out and filled in a two-color matching program. In addition, in an alternative embodiment, the y-coordinate of the target color coordinates may also be used.
Then pressing the key of 'generating target brightness', the software can generate brightness values of two colors, one is unchanged, and the brightness value output by the software can reach the set color and the maximum brightness of the module by adjusting the driving current of the other lamp tube according to the value to change the brightness of the other lamp tube to the brightness value output by the software.
In addition, other variations within the spirit of the invention may occur to those skilled in the art. Such variations are intended to be included within the scope of the invention as claimed.
Claims (9)
1. A color matching method for light emitting diode comprises a first monochromatic light emitting diode, a second monochromatic light emitting diode and a third monochromatic light emitting diode, wherein the color coordinate and the brightness coordinate of the three monochromatic light emitting diodes are respectively (x)1，y1，Y1)，(x2，y2，Y2) And (x)3，y3，Y3) Wherein Y is1，Y2，Y3All are the original brightness of the monochromatic LED, the color coordinate and brightness (x) of the target color to be synthesized4，y4，Y4) The method is characterized by comprising the following steps:
when the three monochromatic light-emitting diodes are used for synthesizing the target color, the brightness of the first monochromatic light-emitting diode, the brightness of the second monochromatic light-emitting diode and the brightness of the third monochromatic light-emitting diode are respectively Y1’，Y2’，Y3', which satisfies the following luminance relation: y is4＝Y1’+Y2’+Y3’，Y2’＝Y1’×K2，Y3’＝Y1’×K3Wherein
Selecting one of the three monochromatic LEDs as standard, and making the selected monochromatic LED maintain the original brightness when synthesizing the target color, i.e. Y1’＝Y1Or Y2’＝Y2Or Y3’＝Y3；
And adjusting the brightness of the other two monochromatic light-emitting diodes according to the brightness relational expression of the three monochromatic light-emitting diodes when the target color is synthesized so as to obtain the target color.
2. The method of claim 1, wherein the step of determining the brightness relationship between the three monochromatic light emitting diodes comprises first combining the first monochromatic light emitting diode and the second monochromatic light emitting diode into an intermediate color having color coordinates and brightness coordinates (x) of (x)c，yc，Yc) Wherein Y isc＝Y1’+Y2', and
3. the method of claim 1, wherein the step of selecting a single color led as a standard comprises comparing Y1，Y2/K2And Y3/K3The size of (2) is based on the standard of selecting the monochromatic light emitting diode corresponding to the minimum value.
4. The method of claim 1, wherein said method further comprises providing a software interface for inputting the color coordinates and intensity coordinates of said three monochromatic leds as (x) respectively1，y1，Y1)，(x2，y2，Y2) And (x)3，y3，Y3) And the color coordinates (x) of the target color to be synthesized4，y4) Then, according to the brightness relation formula, the software directly gives the brightness needed to be set by the three monochromatic light-emitting diodes.
5. A color matching method for light emitting diodes as claimed in claim 1, wherein said three types of single color light emitting diodes are a combination of single color light emitting diodes of three primary colors of red, green and blue.
6.A color matching method for light emitting diode comprises a first monochromatic light emitting diode and a second monochromatic light emitting diode, wherein the color coordinate and the brightness coordinate of the two monochromatic light emitting diodes are respectively (x)1，y1，Y1) And (x)2，y2，Y2) Wherein Y is1，Y2All are the original brightness of the monochromatic LED, the color coordinate and brightness (x) of the target color to be synthesized4，y4，Y4) The method is characterized by comprising the following steps:
when the target color is synthesized by the two monochromatic light-emitting diodes, the brightness of the first monochromatic light-emitting diode and the brightness of the second monochromatic light-emitting diode are respectively Y1’，Y2', which satisfies the relation: y is4＝Y1’+Y2’，Y2’＝Y1’×K2WhereinOr
Selecting one of the two monochromatic LEDs as a standard, and when synthesizing the target color, keeping the original brightness of the selected monochromatic LED unchanged, namely Y1’＝Y1Or Y2’＝Y2；
And adjusting the brightness of the other one of the single-color light-emitting diodes according to the brightness relation of the two single-color light-emitting diodes when the target color is synthesized so as to obtain the target color.
7. The method of claim 6, wherein said step of selecting a single color led as a standard comprises comparing Y1And Y2/K2The size of (2) is based on the standard of selecting the monochromatic light emitting diode corresponding to the minimum value.
8. The method of claim 6, further comprising providing a software interface for inputting the color coordinates and intensity coordinates of the two monochromatic leds as (x) respectively1，y1，Y1)，(x2，y2，Y2) And the color coordinates x of the target color to be synthesized4Or y4Then, according to the brightness relation formula, the software directly gives the brightness needed to be set by the two single-color light-emitting diodes.
9. A color matching method for LED as claimed in claim 6, wherein said two types of single color LEDs are a combination of single color LEDs of any two primary colors of the single color LEDs of three primary colors of red, green and blue.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101569797A CN100501953C (en) | 2006-11-20 | 2006-11-20 | Color matching method of light-emitting diodes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| HK1112685A1 true HK1112685A1 (en) | 2008-09-12 |
| HK1112685B HK1112685B (en) | 2009-09-11 |
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| Publication number | Publication date |
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| CN101192546A (en) | 2008-06-04 |
| CN100501953C (en) | 2009-06-17 |
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Effective date: 20141120 |