TWI417696B - Energy-saving method and device for adjusting color temperature - Google Patents

Description

Energy-saving color temperature adjustment method and calibration device thereof

The invention relates to a calibration technique, in particular to an energy-saving color temperature adjustment method and a calibration device thereof.

The relationship between light brightness and color temperature (CT) and physiological response has been discussed in detail; and the effect of color temperature on human physiology has been extensively studied, and the effect of color temperature on human psychology has also been explored; Lighting factors include illumination brightness, brightness distribution, brightness, brightness distribution, color rendering and color temperature, which help to make the lighting environment more comfortable or enjoyable, and the appropriate color temperature can achieve the appropriate situational atmosphere, which is an important factor in lighting. Therefore, people will adjust the lighting to different color temperatures for different surrounding environments, situational atmospheres and personal preferences.

Correlative Color Temperature (CCT) is used to describe the characteristics of a light source whose chromaticity distribution is perpendicular to the outside of the Planckian trajectory. Red, green and blue (RGB) fluorescent lamps are used to control the correlated color temperature of the lighting system. The most recent general illumination is to control the operating temperature of a light-emitting diode (LED) to improve the luminous efficacy of the LED. The general technique uses red, green, and blue LEDs to illuminate the source of light through the color mixing of the light, the brightness control of the color light, and the retention of the chromaticity points. Then, by individually controlling the pre-currents (I _R , I _G , I _B ) of the RGB LEDs, the chrominance coordinates of the original correlated color temperature are converted to another user-like chromaticity coordinates, where the original chromaticity coordinates are set. The set current amount (I _R , I _G , I _B ) is the maximum saturation, and (I _Ro , I _Go , I _Bo ) represents the maximum amount of pre-current. However, how to choose a suitable chromaticity coordinate to drive the maximum current through the specified RGB LED becomes the key to an optimized design.

According to color theory, the brightness of light will be reduced when the original chromaticity coordinates are converted to other chromaticity coordinates. U.S. Patent No. 7,515,128 discloses a method for brightness compensation that maps the measured spectral power distribution to a color space, according to the x, y corresponding to the International Illumination Commission (CIE) chromaticity coordinates, and by Formula F. =0.256-0.184y-2.527xy+4.656x ³ y+4.657xy ⁴ , produces a saturation of a significantly different color, using this relationship to obtain the relationship between the brightness Y and F Y ₁ ×10 ^F1 =Y ₂ ×10 ^F2 Then, the brightness compensation factor F is obtained, but the compensated brightness does not reach the maximum brightness under the premise of energy saving.

Therefore, the present invention has been directed to the above-mentioned problems, and proposes an energy-saving color temperature adjustment method and a calibration device thereof to solve the problems caused by the prior art.

The main object of the present invention is to provide an energy-saving color temperature adjustment method and a calibration device thereof, which can be applied to the technology of multi-primary color illumination or display backlight, and meet the requirements of energy saving and green energy when the color temperature point is converted. And can use the maximum illumination brightness to achieve the most energy-saving purposes.

In order to achieve the above object, the present invention provides an energy-saving color temperature adjustment method, which firstly captures color information such as the primary color coordinates of at least three primary colors and its maximum brightness, and then calculates a complex color center of gravity color coordinate and a system white point color according to the primary color coordinates. Coordinates, and the color gamut of the primary color is established by the color center of the color center. The color gamut has at least three sub-regions, each of which is defined by four color center of gravity coordinates. Then, a sub-region to which the target color coordinate of a target color temperature belongs is selected, and this is used as a sub-target region. In the next step, in order to solve, the luminance solutions of the remaining unknown primary colors corresponding to the sub-target regions can be calculated according to the color-matching center-of-color coordinates, the maximum brightness and the system white point color coordinates corresponding to the sub-target regions. Finally, adjust the color temperature of all primary colors based on the brightness solution and maximum brightness.

The invention also provides an energy-saving color temperature adjusting device, which is connected to one of the optical signals The light source comprises an at least three primary colors, and the energy-saving color temperature adjusting device comprises a light detector, wherein the light detector receives the optical signal and captures color information such as a primary color coordinate of the primary color and a maximum brightness thereof. The photodetector is connected to a processor and receives the primary color coordinates and the maximum brightness to calculate a complex color center of gravity color coordinate and a system white color coordinate according to the primary color coordinates, and establish a color gamut of the primary color by using a color center of gravity color coordinate, the color The domain has at least three sub-regions, each sub-region defined by four color-matched center-of-grain coordinates. The processor further selects a sub-region to which the target color coordinate of the target color temperature belongs, as the sub-target region, and calculates the remaining unknown corresponding to the sub-target region according to the color-matching center-of-color coordinates, the maximum brightness and the system white point color coordinates corresponding to the sub-target region. The brightness of the two primary colors. The processor and the light source are connected to a brightness driver, and the processor adjusts the color temperature of all the primary colors through the brightness driver based on the brightness solution and the maximum brightness.

For a better understanding and understanding of the structural features and the achievable effects of the present invention, please refer to the preferred embodiment and the detailed description.

It can be understood from the prior art that when one color temperature is adjusted to another color temperature, there are an infinite number of brightness solutions, which are high or low, but by the present invention, maximum brightness can be obtained after color temperature conversion; in other words, the present invention After adjusting the color temperature, the minimum luminous flux loss is reduced, thereby achieving the purpose of energy saving and green energy.

Please refer to FIG. 1 , the energy-saving color temperature adjusting device 10 of the present invention is connected to a light source 12 that emits an optical signal, and the light source 12 is a light-emitting diode lighting device or a backlight module, and the optical signal is Contains at least three primary colors. The energy-saving color temperature adjustment device 10 includes a photodetector 14 that receives the optical signal and captures color information such as the primary color coordinates of all primary colors and their maximum brightness. The maximum brightness is 100% of the brightness of the corresponding primary color. Where the number of primary colors is N, N 3, NN 3, N is a positive integer, and the above primary color coordinates are [ x _{C (1)} , y _{C (1)} ], [ x _{C (2)} , y _{C (2)} ], ..., [ x _{C ( n )} , y _{C ( n )} ], ..., [ x _{C ( N -1)} , y _{C ( N -1)} ], [ x _{C ( N )} , y _{C ( N )} ], and their maximum brightness is Y _{C (1), MAX} , Y _{C (2), MAX} , ..., Y _{C ( n ), MAX} , ..., Y _{C ( N ) , MAX} , where C (1), C (2) ,..., C ( n ),..., C ( N ) each represent the nth primary color.

The photodetector 14 is coupled to a processor 16, which is coupled to a memory 18 and a brightness driver 20, and receives the primary color coordinates and maximum brightness for storage in the memory 18, and calculates a complex color mixture based on the primary color coordinates. Center of gravity color coordinates P{ C ( i ), C ( i +1),..., C ( k )} and a system white point color coordinates ( x _w , y _w ), color center of gravity center coordinates P{ C ( i ), C ( i +1),..., C ( k )} and the system white point color coordinates ( x _w , y _w ) are calculated by the following formula:

When N k > i 1 o'clock, P{ C ( i ), C ( i +1),..., C ( k )}= G =

Another when N i > k 1 o'clock, P{ C ( i ), C ( i +1),..., C ( N ), C (1),..., C ( k )}= G =

among them

The processor 16 further establishes a color gamut of the primary color with a color center of gravity center color. The color gamut has (N-2) loops, each loop has N sub-regions, and each sub-region is composed of four color-matched center-of-grain coordinates P{ C ( i ), C ( i +1),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)]}, P { C ( i ), C ( i +1),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)], C [ i -( N - j )]}, P{ C ( i -1), C ( i ), C ( i +1),..., C ( N ), C (1), C (2) ,..., C [ i -( N - j +1)], C [ i -( N - j )]}, P{ C ( i -1), C ( i ), C ( i +1) ,..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)]}, where i and j are sub-goals as described below Regional related.

The processor 16 further selects a sub-region to which the target color coordinate of the target color temperature belongs, as the sub-target region, which is the i-th sub-region of the j-th circle of the color gamut, where i=m+1,i +j=n-1,1 i N,1 j N-2, i, j, m and n are all positive integers. The processor 16 calculates the luminance solutions Y _{C ( m )} and Y _{C ( n )} of the remaining unknown primary colors corresponding to the sub-target regions according to the color-matching center-of-color coordinates, the maximum brightness and the system white point color coordinates corresponding to the sub-target regions. This luminance solution Y _{C ( m )} , Y _{C ( n )} is obtained according to the following formula:

For i k i+j, Y _{C ( k )} = Y _{C ( k ), MAX} (3);

for

among them

For k=i+j+1=n,

,among them

For the remaining k, Y _{C ( k )} =0 (6).

After the luminance solutions Y _{C ( m )} , Y _{C ( n ) are} obtained, the processor 16 can adjust the color temperature of all the primary colors through the luminance driver 20 based on the luminance solution and the maximum luminance, and provide the reduction of the minimum luminous flux loss. , to achieve maximum illumination brightness.

Please refer to Figure 2 below. First, as shown in step S10, the photodetector 14 captures color information such as the primary color coordinates of at least three primary colors and their maximum brightness, and the maximum brightness is 100% of the brightness of the corresponding primary color. Then, as shown in step S12, the processor 16 calculates the complex color center-of-gravity color coordinates P{ C ( i ), C ( i +1), . . . , C ( k )} and a system white point color coordinate according to the primary color coordinates. ( x _w , y _w ), where N 3, and is a positive integer, the color center of gravity center coordinates P{ C ( i ), C ( i +1), ..., C ( k )} are calculated by formulas (1-1), (1-2) In the end, the system white point color coordinates ( x _w , y _w ) are calculated by the formula (2). At the same time, the processor 16 establishes a color gamut of the primary color with a color center of gravity color. The color gamut has (N-2) loops, each loop has N sub-regions, and each sub-region is composed of four color-matched center-of-grain coordinates. { C ( i ), C ( i +1),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)]}, P{ C ( i ), C ( i +1),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)], C [ i -( N - j )]}, P{ C ( i -1), C ( i ), C ( i +1),..., C ( N ), C (1), C (2 ),..., C [ i -( N - j +1)], C [ i -( N - j )]}, P{ C ( i -1), C ( i ), C ( i +1 ),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)]}, where i and j are as described below Target area related.

Then, as shown in step S14, the processor 16 selects a sub-region to which the target color coordinate of the target color temperature belongs, as the sub-target region, which is the i-th sub-region of the j-th circle of the color gamut, where i =m+1,i+j=n-1,1 i N,1 j N-2, i, j, m, and n are all positive integers.

The next step is to solve the problem. As shown in step S16, the processor 16 calculates the brightness solution Y of the remaining unknown primary colors corresponding to the sub-target area according to the color-matching center of gravity color coordinates, the maximum brightness and the system white point color coordinates corresponding to the sub-target area. _{C ( m )} , Y _{C ( n )} , and the luminance solution Y _{C ( m )} and Y _{C ( n )} are obtained according to the formulas (3), (4), (5), and (6).

Finally, as shown in step S18, the processor 16 adjusts the color temperature of all the primary colors through the brightness driver 20 based on the brightness solution and the maximum brightness, so as to have the maximum under the maximum current, the minimum loss of the luminous flux, that is, the most energy-saving. Lighting brightness.

In order to specifically describe the flow of the method proposed by the present invention, the following description will be made by taking three primary colors of red (R), green (G), and blue (B) as an example, that is, N=3, and please refer to FIG. 1 and FIG. 3 at the same time.

Let C (1), C (2), and C (3) correspond to C ( R ), C ( G ), and C ( B ), respectively, which represent the primary colors of red, green, and blue, and their primary color coordinates are respectively For [ x _{C ( R )} , y _{C ( R )} ], [ x _{C ( G )} , y _{C ( G )} ] and [ x _{C ( B )} , y _{C ( B )} ], the maximum brightness is Y _{C ( R ), MAX} , Y _{C ( G ), MAX} , Y _{C ( B ), MAX} .

First, the photodetector 14 receives the optical signal to extract [ x _{C ( R )} , y _{C ( R )} ], [ x _{C ( G )} , y _{C ( G )} ], [ x _{C ( B )} , y _{C ( B )} ] and Y _{C ( R ), MAX} , Y _{C ( G ), MAX} , Y _{C ( B ), MAX} and other color information. Next, the processor 16 receives the primary color coordinates and the maximum brightness for storage in the storage 18, and calculates a complex color center of gravity center coordinates P{ C ( R )}, P{ C ( G )}, P{ C according to the primary color coordinates. ( B )}, P{ C ( R ), C ( G )}, P{ C ( G ), C ( B )}, P{ C ( R ), C ( B )}, P{ C ( R ) , C ( G ), C ( B )} and a systematic white point color coordinate ( x _w , y _w ), where the color center of gravity center coordinates P{ C ( R )}, P{ C ( G )}, P{ C ( B )}, P{ C ( R ), C ( G )}, P{ C ( G ), C ( B )}, P{ C ( R ), C ( B )}, P{ C ( R ) , C ( G ), C ( B )} can be obtained according to formula (1), and the system white point color coordinates ( x _w , y _w ) can be obtained according to the following formula:

At the same time, the processor 16 establishes a color gamut of the primary color with a color center of gravity center color. The color gamut has a loop, and the loop has three sub-regions, wherein the first sub-region (zone1) is composed of P{ C ( R )}, P. { C ( R ), C ( G )}, P{ C ( R ), C ( B )}, P{ C ( R ), C ( G ), C ( B )}, the second sub-region ( Zone2) by P{ C ( B )}, P{ C ( G ), C ( B )}, P{ C ( R ), C ( B )}, P{ C ( R ), C ( G ), C ( B )} defined, the third sub-region (zone3) consists of P{ C ( G )}, P{ C ( R ), C ( G )}, P{ C ( G ), C ( B )}, P { C ( R ), C ( G ), C ( B )}.

Then, the processor 16 selects a sub-region to which the target color coordinate of the target color temperature belongs, as the sub-target region. Order 1 i N,1 j N-2, i, j are positive integers, when the target color coordinates are in zone1, j=i=1; when the target color coordinates are in zone2, j=1, i=2; when the target color coordinates are in zone3, j=1, i=3.

Let i=m+1, i+j=n-1, m and n be positive integers, and substituting i and j mentioned in the above paragraph into formulas (3), (4), (5), (6), And rewritten into C ( R ), C ( G ), C ( B ) form, the luminance solutions Y _{C ( m )} and Y _{C ( n )} of the remaining unknown two primary colors corresponding to the sub-target region can be obtained.

If the target color coordinate is in zone1, the red luminance Y _{C ( R )} is Y _{C ( R ), MAX} , green brightness Blue brightness .

If the target color coordinates are in zone2, the blue luminance Y _{C ( B )} is Y _{C ( B ), MAX} , green brightness Red brightness .

If the target color coordinate is in zone3, the green brightness Y _{C ( G )} is Y _{C ( G ), MAX} , red brightness Blue brightness .

Finally, the processor 16 obtains all the luminance solutions based on the equations (3), (4), (5), and (6), and adjusts the color temperatures of all the primary colors through the luminance driver 20, that is, completes the entire process.

Next, the following four primary colors are taken as an example, that is, N=4, and please refer to FIG. 1 and FIG. 4 at the same time.

Let C (1), C (2), C (3), C (4) represent the four primary colors, respectively, whose primary color coordinates are [ x _{C (1)} , y _{C (1)} ], [ x _{C (2)} , y _{C (2)} ], [ x _{C (3)} , y _{C (3)} ] and [ x _{C (4)} , y _{C (4)} ], the maximum brightness is Y _{C (1), MAX} , Y _{C (2), MAX} , Y _{C (3), MAX} , Y _{C (4), MAX} .

First, the photodetector 14 receives the optical signal to capture [ x _{C (1)} , y _{C (1)} ], [ x _{C (2)} , y _{C (2)} ], [ x _{C (3)} , y _{C (3)} ], [ x _{C (4)} , y _{C (4)} ] and Y _{C (1), MAX} , Y _{C (2), MAX} , Y _{C (3), MAX} , Y _{C (4), MAX} Color information. Next, the processor 16 receives the primary color coordinates and the maximum brightness for storage in the storage 18, and calculates the complex color center-of-gravity color coordinates P{ C (1)}, P{ C (2)}, P{ C according to the primary color coordinates. (3)}, P{ C (4)}, P{ C (1), C (2)}, P{ C (2), C (3)}, P{ C (3), C (4) }, P{ C (4), C (1)}, P{ C (1), C (2), C (3)}, P{ C (2), C (3), C (4)} , P{ C (3), C (4), C (1)}, P{ C (4), C (1), C (2)}, P{ C (1), C (2), C (3), C (4)}. And a system white point color coordinates ( x _w , y _w ), where the color center of gravity color coordinates P{ C (1)}, P{ C (2)}, P{ C (3)}, P{ C (4) }, P{ C (1), C (2)}, P{ C (2), C (3)}, P{ C (3), C (4)}, P{ C (4), C ( 1)}, P{ C (1), C (2), C (3)}, P{ C (2), C (3), C (4)}, P{ C (3), C (4 ), C (1)}, P{ C (4), C (1), C (2)}, P{ C (1), C (2), C (3), C (4)} Equation (1) finds that the system white point color coordinates ( x _w , y _w ) can be obtained according to formula (2).

At the same time, the processor 16 establishes the color gamut of the primary color with the color center of gravity, the color gamut has two loops, and each loop has four sub-regions, wherein the first sub-region (zone1) is composed of P{ C (1)} , P{ C (1), C (2)}, P{ C (4), C (1)}, P{ C (4), C (1), C (2)}; the second sub The zone (zone2) consists of P{ C (2)}, P{ C (1), C (2)}, P{ C (2), C (3)}, P{ C (1), C (2) , C (3)} is defined; the third sub-region (zone3) is composed of P{ C (3)}, P{ C (2), C (3)}, P{ C (3), C (4)} , P{ C (2), C (3), C (4)} are defined; the fourth sub-region (zone4) is composed of P{ C (4)}, P{ C (3), C (4)}, P{ C (4), C (1)}, P{ C (3), C (4), C (1)} are defined; the fifth sub-region (zone5) is composed of P{ C (1), C ( 2)}, P{ C (4), C (1), C (2)}, P{ C (1), C (2), C (3)}, P{ C (1), C (2 ), C (3), C (4)} is defined; the sixth sub-region (zone6) is composed of P{ C (2), C (3)}, P{ C (1), C (2), C ( 3)}, P{ C (2), C (3), C (4)}, P{ C (1), C (2), C (3), C (4)}; 7th sub The zone (zone7) consists of P{ C (3), C (4)}, P{ C (2), C (3), C (4)}, P{ C (3), C (4), C ( 1)}, P {C ( 1), C (2), C (3), C (4)} defined 8 subregions (zone8) by the P {C (4), C (1)}, P {C (4), C (1), C (2)}, P {C (3), C (4) , C (1)}, P{ C (1), C (2), C (3), C (4)}.

Then, the processor 16 selects a sub-region to which the target color coordinate of the target color temperature belongs, as the sub-target region. Order 1 i N,1 j N-2, i, j are all positive integers. For example, if the target color coordinate is in zone7, ie zone7 is the sub-target zone, since zone7 is the third sub-region of the second loop, j=2, i =3. Let i=m+1, i+j=n-1, m and n be positive integers, and substitute i and j above into formulas (3), (4), (5), and (6). The luminance solutions Y _{C ( m )} , Y _{C ( n )} of the remaining unknown primary colors corresponding to the target region are obtained. Table 1 below shows all the luminance solutions for all sub-regions:

Finally, the processor 16 obtains all the luminance solutions based on the equations (3), (4), (5), and (6), and adjusts the color temperatures of all the primary colors through the luminance driver 20, that is, completes the entire process.

In summary, when the present invention is applied to color temperature point conversion, it can be lifted before energy saving and green energy, and the maximum illumination brightness is used to achieve the most energy-saving purpose.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, so that the shapes, structures, features, and spirits described in the claims of the present invention are equally varied and modified. All should be included in the scope of the patent application of the present invention.

10‧‧‧Color temperature adjustment device

12‧‧‧Light source

14‧‧‧Photodetector

16‧‧‧ Processor

18‧‧‧Storage

20‧‧‧Brightness driver

Figure 1 is a block diagram of the apparatus of the present invention.

Figure 2 is a flow chart of the method of the present invention.

Figure 3 is a two-dimensional diagram of the three primary color gamut boundaries of the present invention.

Figure 4 is a two-dimensional map of the four primary color gamut boundaries of the present invention.

Claims (14)

An energy-saving color temperature adjustment method comprises the steps of: capturing a primary color coordinate of at least three primary colors and a maximum brightness thereof; calculating a complex color center color coordinate and a system white color coordinate according to the primary color coordinates, and using the color center of gravity The color coordinates establish a color gamut of the primary color, the color gamut having at least three sub-regions, each of the sub-regions being defined by four color-matching center-of-gravity coordinates; the sub-region to which the target color coordinate of a target color temperature belongs is selected, and The sub-target area is obtained; according to the color-matching center-of-color coordinates corresponding to the sub-target area, the maximum brightness and the white point color coordinate of the system, the brightness solution corresponding to the original target color corresponding to the sub-target area is calculated; The color temperature of the primary colors is adjusted based on the brightness solution and the maximum brightness. For example, the energy-saving color temperature adjustment method described in claim 1 wherein the number of primary colors is N, N 3. The primary color coordinates are [ x _{C (1)} , y _{C (1)} ], [ x _{C (2)} , y _{C (2)} ], ..., [ x _{C ( n )} , y _{C ( n )} ],...,[ x _{C ( N )} , y _{C ( N )} ], the maximum brightnesses are Y _{C (1), MAX} , Y _{C (2), MAX} , ..., Y _{C ( n ), MAX} , . . . , Y _{C ( N ), MAX} , the color gamut has (N-2) loops, each loop has N sub-regions, each of the sub-regions Four of these mixed color center-of-grain coordinates P{ C ( i ), C ( i +1),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)]}, P{ C ( i ), C ( i +1),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)], C [ i -( N - j )]}, P{ C ( i -1), C ( i ), C ( i +1),..., C ( N ), C (1), C(2),..., C [ i -( N - j +1)], C [ i -( N - j )]}, P{ C ( i -1), C ( i ), C( i +1),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)]}, and The sub-target area is the i-th sub-region of the jth circle of the color gamut, where C (1), C (2), ..., C ( n ), ..., C ( N ) each represents the nth primary color. The energy-saving color temperature adjustment method according to claim 2, wherein the color-matching center-of-grain color coordinates P{ C ( i ), C ( i +1), ..., C ( k )} are as follows Formula found: when N k > i 1 o'clock, P{ C ( i ), C ( i +1),..., C ( k )}= G =( ),among them When N i>k 1 o'clock, P{ C ( i ), C ( i +1),..., C ( N ), C (1),..., C ( k )}=G= among them And the white point color coordinates ( x _w , y _w ) of the system are obtained by the following formula: ( x _w , y _w )=( ),among them . The energy-saving color temperature adjustment method according to claim 3, wherein the color center-of-gravity color coordinates corresponding to the sub-target area, the maximum brightness and the white point color coordinates of the system are calculated to calculate the brightness. In the solution step, i=m+1, i+j=n-1,1 i N,1 j N-2, and the luminance solution Y _{C ( m )} , Y _{C ( n )} is obtained according to the following formula: for i k i+j, Y _{C ( k )} = Y _{C ( k ), MAX} ; for k=i-1=m, Y _{C ( k )} = Y _{C ( m )} = ,among them For k=i+j+1=n, Y _{C ( k )} = Y _{C ( n )} = ,among them , And for the remaining k, Y _{C ( k )} =0. For example, in the energy-saving color temperature adjustment method described in claim 1, wherein the number of primary colors is three, the color gamut has a loop, and the loop has three sub-regions. The energy-saving color temperature adjustment method according to claim 1, wherein the number of primary colors is four, the color gamut has two loops, and each loop has four sub-regions. An energy-saving color temperature adjusting device is connected to emit a light source of an optical signal, the light signal comprises at least three primary colors, and the energy-saving color temperature adjusting device comprises: a light detector, which receives the optical signal, and Taking the primary color coordinates of the primary colors and their maximum brightness; a processor connecting the photodetectors and receiving the primary color coordinates and the maximum brightness to calculate a plurality of mixed color center of gravity coordinates and a system white according to the primary color coordinates Point color coordinates, and the color gamut of the primary color is established by the color-matching center-of-gravity color coordinates, the color gamut has at least three sub-regions, each of the sub-regions is defined by four color-matching center-of-gravity coordinates, and the processor further selects one The sub-region to which the target color coordinate of the target color temperature belongs, as the sub-target region, and based on The sub-target area corresponding to the color-matching center-of-grain color coordinates, the maximum brightness and the white point color coordinates of the system, calculating a brightness solution corresponding to the primary color of the sub-target area; and a brightness driver connecting the processor and the The light source is configured to adjust the color temperature of the primary colors through the brightness driver based on the brightness solution and the maximum brightness. The energy-saving color temperature adjusting device according to claim 7, wherein the light source is a light-emitting diode lighting fixture or a backlight module. The energy-saving color temperature adjusting device according to claim 7, further comprising a storage device connected to the processor, wherein the processor stores the primary color coordinates and the maximum brightness in the storage device, For the processor to calculate. The energy-saving color temperature adjusting device according to Item 7 of the patent application, wherein the number of the primary colors is N, N 3. The primary color coordinates are [ x _{C (1)} , y _{C (1)} ], [ x _{C (2)} , y _{C (2)} ], ..., [ x _{C ( n )} , y _{C ( n )} ],...[ x _{C ( N -1)} , y _{C ( N -1)} ], [ x _{C ( N )} , y _{C ( N )} ], the maximum brightness is Y _{C (1) , MAX} , Y _{C (2), MAX} , ..., Y _{C ( n ), MAX} , ... Y _{C ( N ), MAX} , the color gamut has (N-2) loops, each of which The loop has N sub-regions, each of which consists of the four color-matched center-of-gravity coordinates P{ C ( i ), C ( i +1), ..., C ( N ), C (1) , C (2),..., C [ i -( N - j +1)]}, P{ C ( i ), C ( i +1),..., C ( N ), C (1 ), C (2),..., C [ i -( N - j +1)], C [ i -( N - j )]}, P{ C ( i -1), C ( i ), C ( i +1),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)], C [ i -( N - j )]}, P{ C ( i -1), C ( i ), C ( i +1),..., C ( N ), C (1), C (2),..., C [ i -( N - j +1)]} is defined, and the sub-target area is the i-th sub-region of the j-th circle of the color gamut, where C (1), C (2), ..., C ( n ),..., C ( N ) each represent the nth primary color. The energy-saving color temperature adjusting device according to claim 10, wherein the color-matching center-of-gravity coordinates P{ C ( i ), C ( i +1), ..., C ( k )} are as follows Formula found: when N k > i 1 o'clock, P{ C ( i ), C ( i +1),..., C ( k )}= G =( ),among them When N i>k 1 o'clock, P{ C ( i ), C ( i +1),..., C ( N ), C (1),..., C ( k )}= G = ( ), among them And the white point color coordinates ( x _w , y _w ) of the system are obtained by the following formula: ( x _w , y _w )=( ),among them . For example, the energy-saving color temperature adjusting device described in claim 11 wherein i=m+1, i+j=n-1,1 i N,1 j N-2, and the luminance solution Y _{C ( m )} , Y _{C ( n )} is obtained according to the following formula: for i k i+j, Y _{C ( k )} = Y _{C ( k ), MAX} ; for k=i-1=m, ,among them For k=i+j+1=n, ,among them For the remaining k, Y _{C ( k )} =0. The energy-saving color temperature adjusting device according to claim 7, wherein the number of primary colors is three, the color gamut has a loop, and the loop has three sub-regions. The energy-saving color temperature adjusting device according to claim 7, wherein the number of the primary colors is four, the color gamut has two loops, and each of the loops has four sub-regions.