[0024] Please refer to figure 2 versus image 3 , figure 2 Is a schematic diagram of a color display system of the present invention, image 3 It is a flowchart of a color display method of the present invention. Such as figure 2 As shown, the color display system 100 of the present invention includes an image input unit 102, an arithmetic unit 104, and a display device 106. The display device 106 includes a plurality of pixel units (not shown) and a first backlight source 108. And a second backlight source 110. Such as image 3 As shown, the color display method of the present invention includes the following steps:
[0025] Step S100: Use the image input unit 102 to input a color signal 112 into the arithmetic unit 104;
[0026] Step S200: Next, according to a color conversion method, the color signal 112 is converted into a first color output signal 114 and a second color output signal 116 by the arithmetic unit 104;
[0027] Step S300: Then, sequentially output the first color output signal 114 and the second color output signal 116 to the display device 106;
[0028] Step S400: Next, input the first color output signal 114 to a pixel unit to display the first color output signal 114 and simultaneously light up the first backlight source 108; and
[0029] Step S500: Then, input the second color output signal 116 to the same pixel unit to display the second color output signal 116, and at the same time turn off the first backlight source 108 and light up the second backlight source 110.
[0030] In addition, please refer to Figure 4 , Figure 4 It is a schematic diagram of the distribution of the first backlight source and the second backlight source of the present invention. Such as Figure 4 As shown, the first backlight source 108 includes a plurality of first light-emitting units 118 having a first color gamut and a plurality of second light-emitting units 120 having a second color gamut, and the first light-emitting units 118 located in the same column The second light-emitting unit 120 is arranged in a staggered arrangement, and the first light-emitting unit 118 and the second light-emitting unit 120 in the same row are also arranged in a staggered arrangement. Each first light emitting unit 118 of the present invention includes a first color light emitting diode 122, a second color light emitting diode 124, and a third color light emitting diode 126, and each second light emitting unit 120 includes a fourth color light emitting diode 128. A fifth-color light-emitting diode 130 and a sixth-color light-emitting diode 132, but the light-emitting unit of the present invention is not limited to being composed of light-emitting diodes, and may be composed of other light-emitting components. In this embodiment, the first light emitting unit 118 includes a first red light emitting diode 122, a first green light emitting diode 124, and a first blue light emitting diode 126, and the second light emitting unit 120 includes a second red light emitting diode 128. , A second green light emitting diode 130 and a second blue light emitting diode 134 are examples, but not limited to this. In addition, the wavelengths generated by the first red LED 122 and the second red LED 128 of this embodiment are both 620.59 nm; the wavelength of the first green LED 124 is 531 nm, and the wavelength of the second green LED is 130 The wavelength is 506 nm; the wavelength of the first blue LED 126 is 459 nm, and the wavelength of the second blue LED 132 is 466 nm. However, the wavelengths of the first light emitting diode and the second light emitting diode of the present invention are not limited to the above-mentioned wavelengths. The first light emitting diode and the second light emitting diode having different wavelengths can also be replaced in the present invention according to actual needs. In addition, the first backlight source 108 and the second backlight source 110 of this embodiment are constituted by a 10×18 matrix composed of the first light-emitting unit 118 and the second light-emitting unit 120, but the present invention is not limited to this, and may be practical. The requirements determine the size of the matrix formed by the first light-emitting unit 118 and the second light-emitting unit 120.
[0031] Please refer to Figure 5 , And please refer to Figure 4. Figure 5 It is the CIE 1931 xy chromaticity diagram of the first color gamut and the second color gamut of the present invention. Such as Figure 5 As shown, the wavelength of the first red LED 122, the wavelength of the first green LED 124, and the wavelength of the first blue LED 126 constitute the first color gamut 134, and the wavelength of the second red LED 128, the second The wavelength of the green LED 130 and the wavelength of the second blue LED 132 constitute a second color gamut 136. It should be noted that the colors produced by the first backlight source 108 are restricted to the first color gamut 134, and the colors produced by the second backlight source 110 are restricted to the second color gamut 136. In addition, the present invention uses the first backlight source 108 and the second backlight source 110 to be turned on to mix the first color gamut 134 and the second color gamut 136, and then a color gamut larger than the first color gamut 134 is formed by the concept of time mixing. The color gamut 138 is mixed with the second color gamut 136 to enhance the color gamut of color display.
[0032] Hereinafter, the color conversion method of the present invention will be described more clearly, which cooperates with the first backlight source and the second backlight source to be turned on in turn to display the colors in the mixed color gamut. Please refer to Image 6 versus Figure 7 , Image 6 Is a block diagram of the arithmetic unit of the first embodiment of the present invention, Figure 7 It is a flowchart of the color conversion method according to the first embodiment of the present invention. Such as Image 6 As shown, the calculator 104 includes a saturation calculator 140, a hue angle calculator 142, and a color calculator 144. Among them, the saturation calculator 140, the hue angle calculator 142, and the color calculator 144 are composed of at least one adder, at least one subtractor, at least one multiplier, or at least one divider, and are used to compare the input color The signal 112 performs operations such as addition, subtraction, multiplication, or division. Such as Figure 7 As shown, the color conversion method of this embodiment includes the following steps:
[0033] Step S220: Receive a color signal 112;
[0034] Step S230: Perform a saturation calculation step, use a saturation calculator 140 to obtain a saturation value of the color signal 112, and perform a hue angle weight calculation step to obtain the color signal 112 corresponding to a first look-up table A hue angle weight value and the color signal 112 correspond to a second hue angle weight value of a second look-up table; and
[0035] Step S240: Perform a color calculation step, using the color calculator 142 to convert the color signal 112 into a first color output signal 114 according to the saturation value and the first hue angle weight value, and according to the saturation value and the second hue angle The weight value converts the color signal 112 into a second color output signal 116.
[0036] In step S220, the color signal 112 received in this embodiment includes a first primary color grayscale value 146, a second primary color grayscale value 148, and a third primary color grayscale value 150, and the first primary color of this embodiment The grayscale value 146, the second primary color grayscale value 148, and the third primary color grayscale value 150 are based on the red grayscale value 146, the green grayscale value 148, and the blue grayscale value 150 respectively, but are not limited thereto. The grayscale value of the first primary color, the grayscale value of the second primary color, and the grayscale value of the third primary color can also be other colors, for example: the grayscale value of the first primary color, the grayscale value of the second primary color, and the grayscale value of the third primary color are respectively yellow , Magenta and cyan.
[0037] In step S230, the saturation calculation step is to calculate the saturation value of the color signal 112 according to a saturation calculation formula w=1-(min/max), and use the saturation calculator to calculate the saturation value of the color signal 112, where w is the saturation value, min Is the smallest of the red grayscale value 146, the green grayscale value 148, and the blue grayscale value 150, and max is the red grayscale value 146, the green grayscale value 148, and the blue grayscale value 150 The value of the largest one. For example: when the input combination of red gray scale value 146, green gray scale value 148 and blue gray scale value 150 is (255, 0, 0), the maximum value is red gray scale value 146, and its value is 255 , And the minimum value is the green grayscale value 148 or the blue grayscale value 150. Its value is 0, so the saturation value w can be calculated as 1. When the input red grayscale value 146, green grayscale value 148 and blue When the combination of color gray scale value 150 is (255, 253, 200), the maximum value is red gray scale value 146, its value is 255, and the minimum value is blue gray scale value 150, and its value is 200, so The saturation value w can be calculated as 0.2157. The saturation calculation formula of the present invention is not limited to the above formula, and can be adjusted according to actual needs.
[0038] In addition, please refer to Figure 8 , Figure 8 It is a flowchart of the steps of calculating the hue angle weight of the present invention. Such as Figure 8 As shown, the hue angle weight calculation step in step 230 includes the following steps:
[0039] Step S232: Perform a hue angle calculation step, using the hue angle calculator 142 to calculate a hue angle (Hue) formed by the first primary color grayscale value 146, the second primary color grayscale value 148, and the third primary color grayscale value 150; as well as
[0040] Step S234: Perform a table lookup step, look up a first hue angle weight value corresponding to the hue angle from a first look-up table (LUT), and look up a second hue angle corresponding to the hue angle from a second lookup table Hue angle weight value.
[0041] Please refer to Picture 9 , Picture 9 It is a list of calculation formulas for hue angle of the present invention. Such as Picture 9 As shown by the hue angle H (×60), in step S232, the hue angle of this embodiment is calculated according to the definition of the HSV space, but it is not limited to this, and different color spaces can also be used for calculation. The hue angle calculation step is to first determine the magnitude relationship between the red grayscale value 146, the green grayscale value 148, and the blue grayscale value 150 to distinguish them into a maximum value, an intermediate value, and a minimum value. Then, calculate according to a hue angle formula H=θ+60×((median value-minimum value)/(maximum value-minimum value)), where H is the hue angle, when the red grayscale value 146≥green grayscale value When 148 ≥ blue gray scale value 150, θ is 0 degrees, when green gray scale value 148> red gray scale value 146 ≥ blue gray scale value 150, θ is 60 degrees, when green gray scale value 148≥ In the case of blue gray scale value 150> red gray scale value 146, θ is 120 degrees, when blue gray scale value 150> green gray scale value 148> red gray scale value 146, θ is 180 degrees , When the blue grayscale value 150>red grayscale value 146≥green grayscale value 148, θ is 240 degrees, when the red grayscale value 146≥blue grayscale value 150>green grayscale value 148, then θ is 300 degrees. The hue angle formula of the present invention is not limited to the above formula, and other hue angle formulas can also be used to calculate the hue angle of the color according to the concept that the color and the hue angle in the HSV space have a corresponding relationship.
[0042] In addition, such as Picture 9 The hue angle H(×64) field shows that in order to facilitate the use of circuit components, the calculation ratio of the hue angle can be further converted from 60 to 64, and the hue angle formula can be converted to H=θ+64×((intermediate value -Minimum value)/(Maximum value-Minimum value)), and convert θ to 60 degrees, 120 degrees, 180 degrees, 240 degrees, and 300 degrees to 64 degrees, 128 degrees, 192 degrees, 256 degrees and 320 degrees, to help circuit components can be further processed in binary.
[0043] In addition, in step 234, the first look-up table and the second look-up table are calculated based on the first color gamut of the first backlight source and the second color gamut of the second backlight source. Please refer to Figure 10 to Figure 12 , Picture 10 Is a schematic diagram of the hue angle between the end point of the first color gamut and the end point of the second color gamut according to the first embodiment of the present invention, Picture 11 Is the first lookup table of the first embodiment of the present invention, Picture 12 It is the second lookup table of the first embodiment of the present invention. Such as Picture 10 As shown, the hue angles of the endpoints R1, G1, and B1 of the first color gamut of this embodiment are 0, 120, and 240, respectively, and the hue angles of the endpoints R2, G2, and B2 of the second color gamut are 0, 130, and 130, respectively. 210. Such as Picture 11 versus Picture 12 As shown, in order to use the colors in the first color gamut 134 and the colors in the second color gamut 136 to mix into the colors in the mixed color gamut 138, the first look-up table 164 and the second look-up table 166 of this embodiment can be based on The hue angles of the first color gamut 134 and the second color gamut 136 are calculated, and the first look-up table 164 represents the relationship between the weight value of the first hue angle and the hue angle, and the second look-up table 166 represents the second hue angle. The relationship between the weight value and the hue angle. However, the first lookup table 164 and the second lookup table 166 of the present invention are not limited to Picture 11 versus Picture 12.
[0044] Please continue to refer Image 6 versus Figure 7. In step 240, the color calculation step is based on a first color calculation formula RGB 1 =RGB-w×k 1 ×RGB and a second color calculation formula RGB 2 =RGB-w×k 2 ×RGB to perform operations, where RGB 1 Output signal 114 for the first color, RGB 2 Is the second color output signal 116, RGB is the color signal 112, w is the saturation value, k 1 Is the weight value of the first hue angle, and k 2 Is the second hue angle weight value. In addition, in step 240, the red grayscale value 146, the green grayscale value 148 and the blue grayscale value 150 of the color signal 112 are respectively converted into a first color output signal 114 by the first color calculation formula. The red output grayscale value 152, a first green output grayscale value 154, and a first blue output grayscale value 156 are respectively converted into a second red color of the second color output signal 116 by the second color calculation formula The output grayscale value 158, a second green output grayscale value 160, and a second blue output grayscale value 162.
[0045] It can be seen from the above that this embodiment calculates the saturation value of the color signal and the weight value of the di-hue angle, and then converts the color signal into two color output signals corresponding to the two backlight sources, thereby cooperating with the backlight sources to be turned on in turn To enhance the color gamut of the color display, and then display richer colors. Compared with known signals that convert grayscale signals to XYZ color space, the present invention can achieve the effect of multiple primary colors only by the saturation calculator, hue angle calculator, and color calculator with two backlight sources, thereby avoiding Additional arithmetic units are consumed for matrix operations. In addition, the present invention also only needs to provide three color filters in a single pixel, which can avoid increasing the complexity and extra cost of manufacturing color filters. It is worth noting that the present invention is not limited to using only two backlight sources, and is not limited to only calculating two color output signals, and multiple backlight sources can also be used to calculate multiple color output signals to provide more color. Rich images.
[0046] In addition, the color conversion method of the present invention is not limited to the above-mentioned embodiments. The color conversion method of the present invention may also include a gamma correction step, an inversion gamma correction step, or a color space conversion step. Please refer to Figure 13 versus Figure 14 , Figure 13 Is a block diagram of the arithmetic unit of the second embodiment of the present invention, Figure 14 It is a flowchart of the color conversion method according to the second embodiment of the present invention. In order to clearly compare the difference between this embodiment and the above-mentioned embodiment, the same components as those in the first embodiment use the same reference numerals. Such as Figure 13 As shown, compared with the arithmetic unit of the first embodiment, the arithmetic unit 200 of this embodiment further includes a gamma voltage conversion device 202, an inverted gamma voltage conversion device 204, and a first color space conversion arithmetic unit 206 And a second color space conversion operator 208. Such as Figure 14 As shown, the color conversion method of this embodiment includes the following steps:
[0047] Step S220: Receive a color signal 112;
[0048] Step S230: Perform a saturation calculation step, use a saturation calculator 142 to obtain a saturation value of the color signal 112, and perform a hue angle weight calculation step to obtain the color signal 112 corresponding to a first of a first look-up table A hue angle weight value and the color signal 112 correspond to a second hue angle weight value of a second look-up table;
[0049] Step S250: Perform a gamma correction step, using the gamma voltage conversion device 202 to convert the grayscale value of the color signal 112 into a brightness value;
[0050] Step S260: Perform a color space conversion step, using the first color space calculator 206 to convert the color signal 112 into a first color space signal 208, and using the second color space calculator 210 to convert the color signal 112 into a second Color space signal 212;
[0051] Step S240: Perform a color calculation step, using the color calculator 144 to convert the first color space signal 208 into a first color output signal 114 according to the saturation value and the first hue angle weight value, and according to the saturation value and the first color output signal 114 The two hue angle weight values are used to convert the second color space signal 212 into a second color output signal 116; and
[0052] Step S270: Perform a De-Gamma correction step, using the inverted gamma voltage conversion device 204 to convert the brightness values of the first color output signal 114 and the second color output signal 116 into grayscale values.
[0053] In step S250, the gamma correction step of this embodiment is used to avoid a significant difference between the color signal and the color perceived by the human eye after calculation, which does not conform to the human eye's perception of image changes, so the input color is first The first primary color grayscale value, the second primary color grayscale value, and the third primary color grayscale value of the signal 112 are respectively converted to the first primary color brightness value, the second primary color brightness value, and the third primary color brightness value to have a more correct color mixing, and Contribute to subsequent color calculations. In addition, in step S260, the color space conversion step of this embodiment is to first design a first color conversion matrix M1 and a second color conversion matrix M2 according to the first backlight source and the second backlight source, and then use the first color The spatial calculator 206 multiplies the first primary color brightness value, the second primary color brightness value, and the third primary color brightness value by the first color conversion matrix M1 to obtain a first color space brightness value, a second color space brightness value, and a first The three-color space brightness value is the first color space signal 208, and the first primary color brightness value, the second primary color brightness value, and the third primary color brightness value are multiplied by the second color conversion matrix M2 by the second color space calculator 210, In order to obtain a fourth color space brightness value, a fifth color space brightness value, and a sixth color space brightness value, that is, the second color space signal 212, whereby the first primary color brightness value and the second primary color brightness value And the third primary color brightness value is converted to the color space of the first backlight source and the color space of the second backlight source, thereby avoiding color deviation caused by subsequent display of the first color output signal 114 and the second color output signal 116. In this embodiment, M1 can be M2 can be However, the present invention is not limited to this, and corresponding adjustment or design can also be made according to the desired first color gamut and second color gamut. Then, compared with the first embodiment, step S240 of this embodiment is to perform the first color calculation formula RGB on the first color space brightness value, the second color space brightness value, and the third color space brightness value 1 =RGB-w×k 1 ×RGB calculation, and the fourth color space brightness value, the fifth color space brightness value and the sixth color space brightness value are subjected to the second color calculation formula RGB 2 =RGB-w×k 2 ×RGB calculation to obtain the first color output signal 114 and the second color output signal 116 represented by the brightness value. Finally, in step S270, the inverted gamma correction step is to convert the first color output signal 114 and the second color output signal 116 that were previously converted into brightness values through the gamma correction step, and then convert them to grayscale values to help display The display of the device.
[0054] In summary, the color conversion method of the present invention mainly first calculates the saturation value of the color signal and the weight value of the di-hue angle, and then calculates the color operation steps corresponding to the two backlight sources to obtain two different color output signals , And cooperate with the backlight source to be turned on to display richer colors and enhance the color gamut of color display.
[0055] The foregoing descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should fall within the scope of the present invention.
