CN105469750A - Color display control method based on local base color desaturation algorithm - Google Patents

Abstract

The invention discloses a color display control method based on a local primary color desaturation algorithm, which dynamically adjusts the brightness and color distribution of sub-field backlights according to image content, and realizes color display through temporal color mixing. In the method, the color of the image or video included in each local backlight area is analyzed, and the backlight driving signal is controlled to realize desaturation processing of the color of the area backlight, that is, the base color. Under the premise of ensuring that the original image or video color is completely reproduced or nearly completely reproduced, the color difference between three adjacent subfield images in one frame is minimized; and based on the input image or video signal, according to the local area The primary color desaturation algorithm sets the backlight drive signal; based on the input image or video signal and the backlight drive signal, the liquid crystal drive signal is set according to the local primary color desaturation algorithm. The method can effectively avoid the color splitting phenomenon of the traditional red, green and blue primary color sequential color display, improve the image quality, and effectively reduce the power consumption of the display device.

Description

A Color Display Control Method Based on Local Primary Color Desaturation Algorithm

technical field

The invention relates to a color display control method based on a local primary color desaturation algorithm, and belongs to the field of display technology.

Background technique

In recent years, digital flat panel display technology represented by liquid crystal display (LCD) has developed rapidly. With the development of liquid crystal material technology, the improvement of TFT manufacturing process and the improvement of the processing speed of digital circuit hardware, the response speed of liquid crystal is continuously accelerated, and the refresh rate of the display is generally increased from the traditional 60Hz to 120Hz, and the screen with a refresh rate of 240Hz has also entered the market. stage of small-scale mass production. With the continuous improvement of the refresh rate, the realization of sequential color-mixing liquid crystal display becomes possible. Compared with traditional liquid crystal displays that use red, green and blue primary color sub-pixels for spatial color mixing, the sequential color mixing method does not require color filters, which not only improves the light efficiency by more than 3 times, but also reduces the module material cost by nearly 19%. Since the sub-pixels on the previous panel can independently display image content, the resolution of the sequential color-mixing display panel will increase by 3 times under the same process conditions. These advantages enable the time-sequential color-mixing liquid crystal display to fully meet the requirements of the next-generation display in terms of high-definition picture quality, environmental protection, low power consumption and energy saving.

However, due to the panning and smooth tracking of the human eye during viewing, when there is a relative speed between the object being viewed and the eyeball, the multi-field content of the time-sequential color mixing display often cannot be completely overlapped on the retina, that is, the color breakup phenomenon (ColorBreakup) is formed. . This phenomenon will cause irregular colored lines to appear on the outline of the object, which seriously affects the display effect of the sequential color mixing display. Generally, the problem of color separation can be alleviated by increasing the refresh rate of the display and adding an additional primary color field, but this will greatly increase the production cost of the display.

Under the conditions of a liquid crystal panel driven by a refresh rate of 180Hz, the present invention makes full use of the modulation of the backlight area, and performs local primary desaturation (LocalPrimaryDesaturation) processing on the color range contained in each backlight partition, abandoning the original red, green and blue backlight primary colors, Recalculate the color coordinates of the 3 primary colors according to the regional color distribution and minimize the size of the new primary color triangle, so that the color difference of the adjacent 3 subfield images constituting a frame is reduced, effectively suppressing the color separation phenomenon of the traditional red, green and blue primary color sequential LCDs , improving the image quality of the sequential liquid crystal display and reducing the overall power consumption of the liquid crystal display.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a color display control method based on a local primary color desaturation algorithm. The method realizes color display through time-mixed color by frequency doubling backlight and refresh clock of liquid crystal display, can remove color filter and improve light efficiency. At the same time, by reducing the color difference between adjacent sub-field images, the color splitting phenomenon of traditional red, green and blue primary color sequential color display is avoided, and the display image quality is improved; the absolute strength of the backlight driving signal is set according to the area image or video content, further reducing Displays device power consumption.

Technical scheme: in order to achieve the above object, the technical scheme adopted in the present invention is:

A color display control method based on a local primary color desaturation algorithm, characterized in that: dynamically adjust the brightness and color distribution of the sub-field backlight according to the image content, and realize color display through time mixing, specifically comprising the following steps:

Partition the input image or video content according to the number of backlight units, and analyze the chromaticity and brightness of each partition to obtain the chromaticity distribution of each partition; according to the chromaticity distribution of each partition, real-time dynamic selection The three primary colors of each subfield in the corresponding partition replace the traditional R-G-B three primary colors; then control the driving signal of each backlight unit in each subfield according to the selected dynamic primary color combination, and set the backlight color and intensity of the corresponding backlight unit; finally based on the input image or The video signal and the driving signal of the backlight unit are used to set the liquid crystal driving signal of each pixel in each subfield.

Beneficial effects: the color display control method based on the local primary color desaturation algorithm provided by the present invention provides an effective method for liquid crystal display without color filters. The method realizes color display through sequential color mixing, does not require color filters, avoids optical loss of color filters, and improves light efficiency by as much as three times. This method adjusts the backlight color of subfields in real time based on image and video content, and reduces the color difference between adjacent subfield images through primary color desaturation processing, which can effectively avoid the color splitting phenomenon of traditional red, green, and blue primary color sequential color display. The image quality of time-sequential color display is thereby improved. At the same time, in the process of primary color desaturation processing, while controlling the chromaticity of each area backlight unit according to the image or video content, the absolute strength of the backlight driving signal is set according to the area image or video content, that is, the area is realized according to the area image and video content. The brightness adjustment of the backlight can further reduce the power consumption of the display device.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is a schematic diagram of image content area division in the present invention;

Fig. 3 is a schematic diagram of primary color desaturation algorithm in the present invention;

Fig. 4 is a schematic diagram of backlight drive setting and realization of the present invention;

Fig. 5 is the method for determining the gray level of the subfield of the present invention;

Fig. 6 is a flowchart of the implementation of the method of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

The present invention utilizes the sub-fields in which the three primary colors change dynamically in space and time, and realizes color display through temporal color mixing.

The method coordinately controls the backlight unit and the liquid crystal display module when realizing image or video display. One frame time is divided into three sub-fields, the color and brightness of the backlight unit can be controlled in different areas, and each sub-field time is independently controllable; the transmittance of each pixel of the liquid crystal display module is independently controllable within each sub-field time.

The method partitions the received image or video content; and analyzes the chromaticity and brightness of the image or video content in each partition. By recording the chrominance and brightness distribution of the image or video content corresponding to each partition unit, and under the premise of ensuring that the original image or video content is completely reproduced or nearly completely reproduced, the gap between the three adjacent subfield images in one frame is minimized. Based on the basic principle of the color difference among them, the primary colors P _i 1 , P _i 2 and P _i 3 of the three subfields are determined.

This method dynamically selects the primary colors P _i 1 , P _i 2 and P _i 3 of the three subfields in real time based on the input image and video content, instead of the traditional combination of red, green, G and blue B three primary colors. Dynamic primary color combination P _i 1-P _i 2-P _i 3, compared with RGB, the primary color saturation is reduced, thereby reducing the color difference between adjacent sub-field images, which can effectively avoid the traditional red, green and blue primary color sequential color display Color splitting phenomenon.

The color brightness of the backlight unit described in the method is controllable by partition, and each subfield is independently controllable; the backlight drive signals BD _i 1, BD _i 2 and BD _i 3 (15) of the three subfields of each unit correspond to the primary color P respectively. _i 1, P _i 2, and P _i 3. For each backlight unit, the primary color combinations P _i 1, P _i 2 and P _i 3 of the three sub-fields are dynamically selected in real time, which can be composed of a spectrum-adjustable light-emitting unit or a combination of light-emitting units with different spectra, which can be composed of but not limited to Red, green, blue or multicolor LEDs are implemented.

The method calculates the overall backlight distributions BP1, BP2 and BP3 corresponding to the three subfields according to the driving signals of the backlight units in each subfield and considering the optical characteristics of the actual backlight module. According to the target image or video content and the backlight distributions BP1 , BP2 , BP3 of the three subfields, the light transmittance distributions T1 , T2 , and T3 corresponding to each subfield are calculated. Using the relationship between the liquid crystal display light transmittance and the drive signal, according to the calculated light transmittance distributions T1, T2 and T3 corresponding to each subfield, determine the drive signal or gray value distribution LC1, corresponding to each subfield LC2 and LC3.

As shown in Figure 1 and Figure 2. In this method, the received image or video content 1 is partitioned, and the image or single-frame video content generally includes H×V pixels. Divide into M×N partitions 2 according to the number of backlight units, and each partition 2 may overlap. A single partition 2 contains P×Q pixels. P×Q×M×N≥H×V. The number of partitions corresponds to the number of backlight units, but there may be different degrees of overlap between adjacent partitions.

Analysis of chrominance and luminance is performed for each partitioned image or video content 2 . As shown in Figure 1 and Figure 3, different from the traditional sequential color display using red R (8) green G (9) blue B (10) three colors, this method records the chromaticity distribution 4 of the content of each partition unit, According to the basic principle of minimizing the color difference between the three adjacent sub-field images in a frame under the premise of ensuring the original image or video color is fully reproduced or nearly completely reproduced, the primary colors P _i of the three sub-fields are determined 1(5), P _i 2(6) and P _i 3(7), where i is the serial number of the partition.

Calculate and count the color coordinate points of each pixel in each partition. Calculation and statistics are not limited to which color coordinate system, it can be xy, uv, u'v', or rgb. Here we take the xy coordinate system as an example for illustration. Assuming that the grayscale value of a certain pixel is (GL _r , GL _g , GL _b ), the calculation formula for the color coordinate point (x, y) of the pixel under the 1931CIE-XYZ color measurement system is as follows:

$\mathrm{<span\; class="notranslate">\; r</span>}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; GL</span>}}_{\mathrm{<span\; class="notranslate">\; r</span>}}}{\mathrm{<span\; class="notranslate">\; 255</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; g</span>}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; GL</span>}}_{\mathrm{<span\; class="notranslate">\; g</span>}}}{\mathrm{<span\; class="notranslate">\; 255</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; b</span>}<span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; GL</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{\mathrm{<span\; class="notranslate">\; 255</span>}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}$

$\left[\begin{array}{c}\mathrm{<span\; class="notranslate">\; x</span>}\\ \mathrm{<span\; class="notranslate">\; Y</span>}\\ \mathrm{<span\; class="notranslate">\; Z</span>}\end{array}\right]<span\; class="notranslate">\; =</span>\left[\begin{array}{ccc}\mathrm{<span\; class="notranslate">\; 0.4124</span>}& \mathrm{<span\; class="notranslate">\; 0.3576</span>}& \mathrm{<span\; class="notranslate">\; 0.1805</span>}\\ \mathrm{<span\; class="notranslate">\; 0.2126</span>}& \mathrm{<span\; class="notranslate">\; 0.7152</span>}& \mathrm{<span\; class="notranslate">\; 0.0722</span>}\\ \mathrm{<span\; class="notranslate">\; 0.0193</span>}& \mathrm{<span\; class="notranslate">\; 0.1192</span>}& \mathrm{<span\; class="notranslate">\; 0.9504</span>}\end{array}\right]\left[\begin{array}{c}\mathrm{<span\; class="notranslate">\; r</span>}\\ \mathrm{<span\; class="notranslate">\; g</span>}\\ \mathrm{<span\; class="notranslate">\; b</span>}\end{array}\right]<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; x</span>}}{\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; Z</span>}}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; the\; y</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; Y</span>}}{\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; Z</span>}}$

In formula (1), γ is the gamma value of the input image or video system standard, usually 2.2. 255 is the normalized value corresponding to the 8bit image system, and if it is 10bit, the value is 1023. and so on. Count the color coordinates of all pixels in a certain partition, and its chromaticity distribution 4 is shown in Figure 1 and Figure 3, including P×Q points. In order to ensure that the original image or video color is completely reproduced or nearly completely reproduced, the three primary colors should contain all pixel coordinates; at the same time, in order to minimize the color difference between the three adjacent subfield images in one frame, the three primary colors The range is continuously narrowed to just include those pixel color coordinates. As shown in Fig. 3, the present invention searches for three new primary colors suitable within the original RGB triangle. A group of new primary color selection methods that meet the requirements are not the only ones, but all belong to the local primary color desaturation method declared by the invention, and are within the scope of the claims. In the following, a basic color determination scheme is taken as an example to describe in detail.

Define the slope of the line connecting the color coordinate points of RG (red and blue 8-9), GB (green and blue 9-10) and BR (blue and red 10-8) in the triangle formed by the original three primary colors under the 1931CIE-XYZ color measurement system k _RG , k _GB , k _BR . Move the three sides of RG, GB and BR in parallel to the center of the triangle until the three sides intersect with the points in the partition color coordinate distribution for the first time, stop moving, and the color coordinates P _i corresponding to the three vertices of the formed concentric triangle 1(5), P _i 2(6) and P _i 3(7), i is the partition serial number, which is established as a new combination of three primary colors. The present invention dynamically selects the primary colors P _i 1, P _i 2 and P _i 3 of the three subfields in real time, instead of the traditional fixed red R green G blue B three primary color combination, the dynamic primary color combination P _i 1-P _i 2- P _i 3, compared with RGB, the primary color saturation is reduced, thereby reducing the color difference between adjacent sub-field images, which can effectively avoid the color splitting phenomenon of traditional red, green, and blue primary color sequential color display.

In order to further reduce the color difference between subfields and suppress color splitting, some pixels can be allowed to fall outside the new three-primary color triangle, for example, (1-ε)×P×Q pixels are in the new triangle, and ε is the allowable error . In actual operation, weight coefficients can also be assigned to each pixel, such as according to brightness Y. All pixel brightness information is The pixel brightness information contained in the new three-primary color triangle is

On the basis of determining the chromaticity of the three subfields, it is necessary to further determine the luminance information of each subfield. The backlight brightness of the three sub-fields can also be calculated by counting the content of the pixels in the sub-area. When the maximum tristimulus value of the pixels in this area is low, the brightness of the new primary color will also increase under the premise of ensuring full color reproduction. Corresponding reduction, that is, the function of Local Dimming of the liquid crystal display is completed at the same time, and the power consumption of the whole machine is reduced. The brightness of the three sub-fields corresponding to partition i is denoted as BY _i 1, BY _i 2, and BY _i 3. Since the primary color chromaticity and brightness of the sub-fields are all realized by the backlight, the driving signals of the three-field backlight drive are composed of BY _i 1, BY _i 2, BY _i 3 and P _i 1(5), P _i 2(6) jointly determined with P _i 3(7). For each backlight unit, the three sub-fields should respectively realize brightness BY _i 1, BY _i 2, BY _i 3 and color coordinates P _i 1(5), P _i 2(6), P _i 3(7).

The basic requirement of the present invention for the sequential color-mixing liquid crystal display is that the refresh rate of the backlight and the display screen can reach three times the frame rate, that is, each frame period can be divided into three sub-fields, and the backlight generally adopts a direct type partitioned backlight unit. As shown in FIG. 2 , the backlight can be divided into M×N units, and the brightness and color of each backlight unit are independently controllable, and each subfield time is independently controllable. The transmittance of each pixel of the liquid crystal display module is controllable, and each sub-field time is independently controllable. The backlight unit and the liquid crystal display module are controlled cooperatively. In order to realize the primary color combination P _i 1(5)P _i 2(6)P _i 3(7) of the three subfields, it can be composed of a spectrum-adjustable light-emitting unit or a combination of light-emitting units with different spectra, or it can be composed of red, Green, blue or multi-color light-emitting diodes are realized, as shown in Figure 4, 19, 20, 21 correspond to red, green, blue LEDs respectively. However, the arrangement and combination of light sources are not limited thereto.

In practical applications, the backlight is often a granular backlight arranged in a matrix, such as a direct-lit LED backlight, which usually requires uniform light treatment. Therefore, before actually reaching the liquid crystal layer, the distribution of the backlight needs to be calculated by analyzing the optical characteristics of the backlight driving signal and the backlight optical film layer 22 . Suppose the light distribution BC _j corresponding to the jth backlight unit, and the corresponding driving signal is α _j , then the overall backlight distribution is The backlight includes intensity information and chromaticity information, and the light distribution can be expressed by XYZ or RGB. The overall light distribution corresponding to the three sub-fields can be denoted as BP1, BP2 and BP3. Taking XYZ as an example here, the XYZ values corresponding to the three subfields of each pixel can be expressed as: $\left[\begin{array}{ccc}{x}_1& x_2& x_3\\ Y_1& Y_2& Y_3\\ Z_1& Z_2& Z_3\end{array}\right].$ Then BP1, BP2, and BP3 are composed of H×V $\left[\begin{array}{c}{x}_1\\ Y_1\\ Z_1\end{array}\right],\left[\begin{array}{c}{x}_2\\ Y_2\\ Z_2\end{array}\right],\left[\begin{array}{c}{x}_3\\ Y_3\\ Z_3\end{array}\right]$ constitute.

According to the target image or video content 1 and the backlight distributions BP1 , BP2 , BP3 of the three subfields, the light transmittances T ₁ , T ₂ , and T ₃ corresponding to each subfield are calculated. The following formulas are available in the XYZ system:

$\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}\\ {\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\end{array}\right]<span\; class="notranslate">\; =</span>{\left[\begin{array}{ccc}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\\ {\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\\ {\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}& {\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}& {\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}\end{array}\right]}^{<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}}\left[\begin{array}{c}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}\\ {\mathrm{<span\; class="notranslate">\; Y</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}\\ {\mathrm{<span\; class="notranslate">\; Z</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}\end{array}\right]<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

The light transmittance distributions of the three subfields are T1, T2 and T3, which are respectively composed of H×V T ₁ , T ₂ and T ₃ . On this basis, the relationship between the light transmittance and the driving signal is displayed by using the liquid crystal, as shown in FIG. 5 . According to the calculated light transmittance distributions T1, T2 and T3 corresponding to each subfield, determine the driving signal or gray value distribution LC1 (16), LC2 (17) and LC3 (18) corresponding to each subfield.

The basic implementation process of a color display control method based on a local primary color desaturation algorithm according to the present invention is shown in FIG. 6 . The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications are also possible. It should be regarded as the protection scope of the present invention.

Claims (8)

1. based on a color display control method for local primary colours desaturation algorithm, it is characterized in that: according to brightness and the color distribution of image content dynamic conditioning subfield backlight, realize colored display by time mixing color, specifically comprise the steps:

According to back light unit number, subregion is carried out to the image inputted or video content (1), and the analysis of colourity and brightness is carried out to each subregion (2), obtain the Colour (4) of each subregion (2); According to the Colour (4) of each subregion (2), the three primary colours (5,6,7) choosing each subfield in respective partition in real time dynamically replace traditional R-G-B three primary colours; Again according to the dynamic primary colours combination chosen, control the drive singal of each back light unit of each subfield (11), backlight color and the intensity of corresponding back light unit (11) are set; Finally based on the image of input or vision signal and primaries signal, the liquid crystal driving signal of each pixel of each subfield is set.

2. color display control method according to claim 1, it is characterized in that: based on the Colour (4) of each subregion (2), according to ensureing original image or video color reappears completely or close under the prerequisite that reappears completely, reduce this cardinal rule of the colour-difference in a frame between adjacent three image in sub-fields to greatest extent, determine the primary colours P of each subfield respectively _i1(5), P _i2(6) and P _i3(7), wherein i is subregion sequence number.

3. color display control method according to claim 1, it is characterized in that: when realizing image or video display, Collaborative Control back light unit and LCD MODULE, three subfields are divided in one frame time, back light unit (11) colour brightness subregion is controlled, independent controlled in each subfield time; Each pixel transmitance of LCD MODULE is controlled, independent controlled in each subfield time.

4. color display control method according to claim 1, is characterized in that: back light unit (11) colour brightness subregion is controlled, independent controlled in each subfield time; The backlight drive signal BD of each back light unit of each subfield _i1(13), BD _i2(14), BD _i3(15) the corresponding primary colours P of difference _i1(5), P _i2(6), P _i3(7), wherein i is subregion sequence number.

5. color display control method according to claim 1, is characterized in that: dynamically primary colours are combined through the luminescence unit combination formation of spectrum adjustable give out light unit or different spectrum, or are realized by light emitting diode.

6. color display control method according to claim 1, is characterized in that: according to each subfield each primaries signal BD _i1(13) BD _i2(14) BD _i3(15), wherein i is subregion sequence number, considers the optical characteristics of actual backlight module, calculates three subfields corresponding Integral back Light distribation BP1, BP2 and BP3 respectively.

7. color display control method according to claim 6, is characterized in that: according to Integral back Light distribation BP1, BP2, BP3 of target image or video content (1) and three subfields, calculate transmittance distribution T1, T2 and T3 that each subfield is corresponding.

8. color display control method according to claim 7, it is characterized in that: utilize the relation between liquid crystal display light transmission rate and drive singal, transmittance distribution T1, T2 and T3 needed for each subfield calculated, determine the drive singal that each subfield is corresponding or grey value profile LC1(16), LC2(17) and LC3(18).