TW200844976A - Transmissive-type liquid crystal display device - Google Patents

Abstract

In a transmissive-type liquid crystal display device including a liquid crystal panel and a backlight, the liquid crystal panel has pixels each divided into four subpixels red (R), green (G), blue (B), and white (W). The backlight is a white backlight by which luminance of emitted light is controllable. A color-saturation reducing section carries out a process of reducing color saturation on a first RGB input signal, which is an original input signal, so that the first RGB input signal becomes a second RGB input signal. Thereafter, an output signal generating section obtains a transmissivity and a backlight value on the basis of the second RGB input signal.

Description

200844976 IX. Description of the Invention: [Technical Field] The present invention relates to a transmissive liquid crystal display device using an active back light for a light source. [Prior Art] Color displays are available in various types and have been put into practical use. If the thin display is roughly distinguished, it can be classified into a self-luminous type display such as a PDp (piasma display panel) and a non-light-emitting type display represented by an LCD (Liquid Crystal Display). In an LCD which is a non-light-emitting type display, a transmissive LCD in which a backlight is disposed on the back side of a liquid crystal panel is known. Fig. 13 is a cross-sectional view showing a general structure of a transmissive LCD. The transmissive LCD is provided with a backlight 11 背面 on the back of the liquid crystal panel loo. The liquid crystal panel 100 is configured such that a liquid crystal layer 103 is disposed between the pair of transparent substrates 1A1 and 1B2, and polarizing plates 104 and 105 are provided on the outer sides of the pair of transparent substrates 1A and 1b. Further, color display can be performed by providing a color filter 106 in the liquid crystal panel 1A. Although not shown, the electrode layer and the alignment film are formed inside the transparent substrates 1〇1 and 1〇2, and the light penetrating the liquid crystal panel 100 is controlled by controlling the voltage applied to the liquid crystal layer 1〇3. The amount of penetration is controlled per pixel. That is, the transmissive LCD performs display control by controlling the amount of light from the backlight 11 to the amount of penetration of the liquid crystal panel 100. The backlight 110 is used to illuminate the light of the wavelengths of the three colors of RGB required for the color display. By combining with the color filter 106, the transmittance of the light of each color of the RGB I27713.doc 200844976 is separately adjusted. , by which the brightness or hue of the pixel can be arbitrarily set. Such a backlight 11() is generally a white light source such as an electro luminescence (EL), a cold cathode tube (c〇id (10) _ fluorescent lamps, CCFL), or a light emitting diode (led). In the liquid crystal panel 1GG, as shown in Fig. 14, a plurality of pixels are arranged in a matrix, and each pixel is usually composed of three sub-pixels. Each of the sub-pixels is arranged to correspond to a color filter layer of red (R) 'green' (g) and blue (B) in the color filter 1〇6. Hereinafter, each sub-pixel is referred to as an R sub-pixel, a G sub-pixel, and a B sub-pixel. Each of the sub-pixels of R, G, and B selectively penetrates light of a wavelength band (ie, red, green, blue) among white light generated from the backlight 11 while other wavelength bands The light is absorbed. Since the light irradiated from the backlight 11 系 in the above-described transmissive LCD is controlled to pass through the pixels of the liquid crystal panel 1 , the light absorbed by the liquid crystal panel 1 当然 is naturally generated. . Further, in the color filter 106, each of the sub-pixels of R, G, and b is also absorbed by light other than the wavelength band of the white light generated from the backlight 11A. Thus, in a general transflective LCD, since the light absorbed by the liquid crystal panel or the color filter is large, and the utilization efficiency of the illumination light from the backlight is low, the power consumption in the backlight is changed. Big problem. As a technique for reducing the power consumption of such a transmissive LCD, there is known a method of using an active backlight that can adjust the luminance of the light according to the display image (for example, 'Japanese Laid-Open Patent Publication No. Hei 11-6553 No. 1 127713.doc 200844976 (Opened March 9, 1999)). That is, in Japanese Laid-Open Patent Publication No. Hei 11-65531, an active backlight using adjustable brightness is disclosed, and display control (brightness control) of the LCD is performed by the transmittance of the liquid crystal panel and the brightness control of the active backlight. In order to reduce the power consumption of the backlight. In Japanese Laid-Open Patent Publication No. Hei 11-65531, the brightness of the backlight is controlled to match the maximum brightness value in the input image (input signal). Furthermore, the transmittance of the liquid crystal panel is adjusted to match the brightness of the backlight at the time. At this time, the transmittance of the sub-pixel which is the maximum value of the input signal is 100%, and the transmittance of the other sub-pixels is also 100% or less which is calculated from the backlight value. Therefore, when the entire image is dark, the backlight can be darkened, and the power consumption of the backlight can be reduced. In the Japanese Patent Application Laid-Open No. Hei No. 65-31, the brightness of the backlight is suppressed to the minimum necessary based on the input signal RGB of the input image, and the degree of darkening of the backlight is caused to cause penetration of the liquid crystal. The rate is increased, so that the amount of light absorbed by the liquid crystal panel can be reduced, and the power consumption of the backlight can be reduced. However, in the above-described conventional configuration, it is possible to reduce the power consumption of the backlight by reducing the amount of light absorbed by the liquid crystal panel, but it is not possible to reduce the amount of light absorbed by the color filter. Therefore, as long as the amount of light absorbed by the color filter can be reduced, a further reduction in power consumption can be obtained. SUMMARY OF THE INVENTION 127713.doc 200844976 It is an object of the present invention to provide a transmissive liquid crystal display device which can reduce the amount of light absorbed by a color filter by a liquid crystal panel and further reduce power consumption. In order to achieve the above object, a transmissive liquid crystal display device of the present invention includes a liquid crystal panel that divides a summer pixel into four sub-pixels of red (R), green (G), blue (7), and white (W); An active backlight, which can control the brightness of the light; the lower part of the shirt is used to calculate the pixel data of higher brightness and chroma among the pixel data included in the first input RGB signal as the input image. The first input RGB signal is converted into a second input RGB signal, and the output signal generating unit generates R, G, B, and W among the pixels of the liquid crystal panel from the second input rgb signal. a sub-pixel transmittance signal 'and calculating a backlight value in the active f-light source; and a liquid helium panel control unit that drives and controls the liquid crystal panel according to the tooth permeability signal generated by the output signal generating unit; and a backlight The source control unit controls the luminance of the backlight based on the calculated backlight value. According to the above configuration, by using a liquid crystal panel in which one pixel is divided into four sub-pixels of R, (}, B, and W, one of the color components of r, g, and b can be partially allocated to none (or less). Because the amount of light caused by the absorption of the filter: W sub-pixels are lost. Thereby, the amount absorbed by the color filter is reduced, and correspondingly (4) low backlight value, so that the transparent liquid crystal display can be realized. The reduction of the power consumption of the device. In addition, the chroma is reduced by the RGB signal input to the ith signal as the original input, and is calculated according to the m 127713.doc 200844976 RGB tungsten number which is subjected to the chroma reduction processing. The backlight value &rgbw transmittance can more reliably reduce the backlight value. Other objects, features and advantages of the present invention are described by the following description. Further, the benefits of the present invention are as described with reference to the accompanying drawings. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First, a schematic configuration of a liquid crystal display device (hereinafter referred to as a liquid crystal display device) of the present embodiment will be described with reference to ® 1. The display device includes a chroma reduction unit, an output signal generation unit 12, a liquid crystal panel control unit 13, an RGBW liquid crystal panel (hereinafter simply referred to as a liquid crystal panel) 14, a backlight control unit 15, and a white backlight (hereinafter referred to as a backlight). The source LCD 16 is formed by arranging Np pixels on a substrate. As shown in FIGS. 2(a) and 2(b), each pixel is composed of R (red), G (green), and blue. % (white) • Four sub-pixels. Further, the shape and arrangement relationship of the R, G, B, and W sub-pixels in each pixel are not particularly limited. Further, the backlight 16 is a white light source such as a cold cathode fluorescent lamp (CCFL) or a white light emitting diode (white LED), and is an active backlight capable of controlling the brightness of the illumination light. - The sub-pixels of R, G, and r in the liquid crystal panel U are arranged so as to correspond to the ferro-strip layers of R, G, and B in the color light guide (not shown). Therefore, each of the sub-pixels of R, G, and B selectively permeates light of the wavelength band among the self-color lights generated by the backlight 16, and the light of the other wavelength band is absorbed. In addition, the sub-pixels are basically not in the color photo-transmission film. 127713.doc -10 - 200844976

There is a corresponding absorption 滹弁κ恩.D to the color produced by the color = that is, the light that penetrates the W sub-pixel will not be completely absorbed by the "Tianzhi color filter". #& Yangshuo is emitted from the liquid crystal panel 4 in the state of white light. However, the w sub-pixels can also be R, r. The Hummer has the light of the moon light source, and the absorption of the two G and B color patches is less. The composition of the twilight layer. This ¥, from the W sub-pixel output, is like white, and the λ element is white, and the total number of RGB pairs is the same as % 'from the RGB sub-pixels. color. However, even if the penetration ratio of the coffee sub-pixel is the same as the tooth penetration rate of the W field J 1 rumor, as the sum of the light of the white light ί sub-pixel outputted by the clip, and the white output from the W sub-pixel The light is not necessarily the same. This is because the brightness is changed by the amount of light received by the color pupil of each sub-pixel or the size of the sub-pixel. ", at this time, the ratio of the intensity of the white light outputted from the W sub-pixel to the intensity of the white light outputted by the sub-pixel is set to the white luminance ratio WR. 4 body and f ’ is the value of the wearer’s sub-pixels set to X% and

曰j pixel's tooth transmittance is set to 0°;)/❹ display brightness P1, and RGB field J pixel's tooth permeability is set to 〇% and the w sub-pixel's transmittance is set to The ratio of p2/pH^ is white brightness ratio wr. In addition, Tongwei is in the same liquid crystal panel, and has the same white luminance ratio WR as the entire panel (i.e., all pixels). The liquid crystal display device receives image information to be displayed as an RGB signal (first input RGB signal) from a personal computer or a television tuner or the like and uses the RGB signal as an input signal Ri, Gi, Bi(i=l, 2, 'NP) is processed. The $degree reduction unit 11 outputs to the wheel-out signal generating unit 12 as the second input RGB signal after the first input RGB signal is subjected to the color 127713.doc 11 200844976 degree reduction processing. The output ## generating unit 12 is a hand I for determining the transmittance of each sub-pixel in the liquid crystal panel 14 and the backlight value in the backlight 16 from the second input RGB signal. That is, the output signal generating unit 12 is configured to obtain the backlight value wbs from the input nicknames Rsi, Gsi, and Bsi which are the second input RGB# numbers, and convert the input 彳s 5 tiger Rsi, Gsi, Bsi into a suitable one. The backlight value Wb s obtained by the transmittance values rsi, gsi, bsi, and wsi of the backlight value wbs is output to the backlight control unit 15, and the backlight control unit 15 is based on the backlight value wbs. The brightness of the backlight 16 is adjusted. The backlight 16 is a white light source such as a CCFL or a white LED, which can be controlled to have a brightness proportional to the backlight value by the backlight control unit 15. The method of controlling the brightness of the backlight 16 varies depending on the type of light source used, but the brightness can be controlled, for example, by applying a voltage proportional to the backlight value or by circulating a current proportional to the backlight value. Further, when the light source is an LED or the like, the brightness can be controlled by changing the duty ratio by pulse width modulation (PWM). In addition, when the brightness of the backlight source has a non-linear characteristic, the brightness of the backlight is controlled by determining the applied voltage and the applied current to the light source from the backlight value in the lookup table. This is controlled to the desired brightness and the like. The transmittance signals rsi, gsi, bsi, and wsi are output to the liquid crystal panel control unit 13, and the liquid panel control unit 13 controls the transmittance of each sub-pixel of the liquid crystal panel 14 based on the transmittance signal. The desired penetration rate. Liquid 127713.doc -12- 200844976 The daily panel control unit 13 is configured to include a scanning line driving circuit, a signal line driving circuit, and the like for generating a scanning signal and a data signal, thereby scanning signals and data signals, etc. The panel controls signals to drive the liquid crystal panel 14. The transmittance signals rsi, gsi, bsi, - are used to generate a data signal at the signal line driving circuit. In the transmittance control of the liquid crystal panel 14, a method of controlling the transmittance of the liquid crystal panel by adding a voltage proportional to the transmittance of the sub-pixel, and linearizing the non-linear characteristic by the pair A method of detecting the voltage applied to the liquid crystal panel from the look-up table, such as the transmittance of φ f , to control the liquid crystal panel to a desired transmittance. Further, in the liquid crystal display device of the present invention, the input signal is not limited to the RGB signal described above, and may be a color signal such as a γυν signal. ♦

The color information other than the input signal may be converted into a field B signal and then input to the output signal generating unit 12, or the output signal generating unit 12 may convert the color input signal other than the deleted signal into The composition of the RGB W signal. • In the present liquid crystal display device, the display brightness in each sub-pixel of the liquid crystal panel η is represented by the brightness (irradiation brightness) of the backlight, the transmittance of the sub-pixel, and the white luminance ratio WR. When the brightness of each sub-pixel of RGB is set as the product of the brightness of the backlight and the transmittance in the sub-pixel, the brightness of the sub-pixel is reflected by the brightness of the backlight and the sub-pixel of w. The transmittance is expressed as the product of the white luminance ratio WR. Here, the display luminance in each sub-pixel is different from the sub-pixel. In the embodiment of the present embodiment, the term "backlight" is used, but the backlight value is proportional to the brightness of the backlight. 127713.doc -13- 200844976 The system is, strictly speaking, not the same as the brightness of the backlight [the same penetration of 1 pixel is proportional to the brightness of the sub-pixels' instead of The same letter. t ^ is also the same as the so-called backlight = in the present embodiment, which is the signal transmitted to the f-light source, and the actual brightness is only proportional to the proportional relationship. Specifically, in the present embodiment The penetration (4) can be obtained by multiplying the transmittance (when the sub-pixel is added) by the backlight value. For this point, the brightness of the pixel is based on the brightness value of the backlight. (brightness), multiplied by the color of each sub-pixel according to the transmittance of the light sheet and the LCD transmittance of the sub-pixel. In addition, the white brightness is higher than the Wei (based on the white brightness of the RGB sub-pixel) : (based on the white brightness of the W sub-pixel), which is based on 嶋The white brightness ratio can also be obtained by (through the transmittance of the w color filter) / (by the color; the transmittance of the light sheet). The display principle and the power consumption reduction effect are as follows. In the liquid crystal display device, the backlight value and the sub-pixel transmittance are obtained by the output signal generation unit 12. Therefore, the backlight value and the sub-function described below are obtained. Pixel penetration

The ::degree reduction unit 11 inputs the processing to the output signal generation unit by the first B 4 number. In the method of determining the backlight value and the sub-pixel transmittance in the liquid crystal display device, "the first minimum threshold value is obtained in the display area of each 盥呰 & Next, the maximum value of 127713.doc •14·200844976 in the m image is obtained from the backlight value necessary for each determination, and the value is used as the backlight value. Here, when the minimum necessary backlight value in each pixel is required, the method of solving the backlight value according to the display data of the pixel can be divided into two methods. Specifically, it is based on the relationship between the maximum brightness (ie, _(Rsi, GS1, BS1)) and the minimum degree of exemption (ie, min(Rsi, Gsi, Bsi)) in the sub-pixels in the pixel of interest. The way in which the pixel H is solved is different. First, the solution of the necessary minimum backlight value in the pixel of interest of min(Rsi, Gsi, Bsi)^max(Rsi, Gsi, • BSi)/(1 + 1/WR) will be described. The second R (}b input signal, the maximum value of GS1, and BS1 of the output signal generating unit are set to be nicked. The minimum value is minRGBsi. Here, the color of the sub-pixel corresponding to the maximum value is described. In the case where the knife is R (red), the same can be considered when maxRGBsi is g (green) and B (supervisor). In addition, (10) the thorn and the heart are expressed as the value of the penetration of the sub-pixel. Here, considering only the display light that penetrates the R component of tmaxRGBsi, the backlight value can be most reduced for the display light, and the transmission amount is allocated to the R sub-pixel and the 1 sub-pixel. When the transmittance of the R sub-pixel and the ... sub-pixel are both 100%, the backlight value of the minimum necessary for this day is set to Blmin, and considering the white luminance ratio WR, the R sub-pixel and | Since the transmittance of the sub-pixels is 1%, the luminance of the outgoing light from the R sub-pixels becomes Blmin, and the luminance of the outgoing light from the pixels becomes WRxBlmin. Furthermore, the output from the R sub-pixels and the W-sub-pixels The sum of the light, that is, 127713.doc -15- 200844976 (l + WR) xBlmin becomes the R component In addition, since (l+WR)xBlmiii is equal to maxRGBsi, Blmin becomes maxRGBsi/(l+WR). However, the above idea is only considering the display light of the R component, and does not consider G and Component B. Actually, if the backlight value is set to maxRGBsi/(l+WR) at minRGBsi<maxRGBsi/(1 + 1/WR), as shown in the following formula, the color component corresponding to the minimum value minRGBsi The amount of penetration will exceed the necessary amount.

MaxRGB si/( 1 + WR) x WR =maxRGBsi/( 1 +1 /WR)>minRGBsi Therefore, in a certain pixel of interest, only when minRGBsigmaxRGBsi/ (1 + 1/WR) is established, in the pixel of interest The minimum necessary backlight value is set to maxRGBsi/(l+WR) according to the above idea. Furthermore, in the attention pixel of minRGBsi<maxRGBsi/(l + l/WR), in order to make the penetration amount of the color component corresponding to the minimum value minRGBsi not exceed the necessary amount, it can be assigned to the maximum wear of the W sub-pixel. The amount of penetration becomes minRGB si 〇 At this time, in the sub-pixel of the color component corresponding to the maximum value maxRGB si, the penetration amount of the same amount is transmitted to the W sub-pixel, and the penetration amount becomes maxRGBsi-minRGBsi. As a result, the minimum necessary backlight value in the above-mentioned pixel of interest is maxRGBsi-minRGBsi°, and the necessary minimum backlight value in each pixel is obtained, and the necessary backlight is used for all the pixels of one image. The maximum value of the source value is set to the backlight value Wbs. 127713.doc -16- 200844976 With this backlight value Wbs, the transmittance of each sub-pixel can be as follows. That is, the transmittance of each sub-pixel of RGB is expressed by (penetration amount) / (backlight value). In addition, the transmittance of the W sub-pixel can be expressed as (penetration) / (backlight value) / (white luminance ratio). This is because the sub-pixels are brighter than the sub-pixels of RGB. The brightness of the sub-pixels is the same as the backlight value. Therefore, the backlight value necessary for the output luminance value of the sub-pixels is 1 of the backlight value necessary for the RGB sub-pixels. /WR times to calculate. Specific examples will be described below with reference to Figs. 3, 4, and 15 to 18. First, when using a liquid crystal panel with a white luminance ratio of ... i, in a pixel that becomes min (Rsi ' Gsi, Bsi) gmax (Rsi, Gsi, Bsi) / (1 + 1 / WR) 'Refer to Figure 3 (a ), (b) explain how the backlight value is solved. Here, Fig. 3(a) is a view showing a manner of solving the backlight value in the liquid crystal display device. Further, Fig. 3(b) is a diagram showing a manner of solving the backlight value in Patent Document 1 for comparison. In Figs. 3(a) and 3(b), the case where the target panel output of a certain pixel of interest is (R ′ G, B) = (50, 60, 40) is considered. At this time, the luminance value 60 of g is max (Rsi, Gsi, Bsi), and the luminance value 40 of B is min (Rsi ′ Gsi, Bsi), which satisfies min (Rsi, Gsi, Bsi) - max (Rsi,

Gsi, Bsi) / (1 + 1 / WR) relationship. In the display method of Patent Document 1, as shown in FIG. 3(b), the backlight value is set to max (Rsi, Gsi, Bsi) = 60, and the transmittance of each sub-pixel is matched with the backlight value. To decide. That is, each of the sub-pixels of R, G, and B has a transmittance of 83% (= 50/60), 1% (= 60/60), and 67% (= 40/60). 127713.doc -17- 200844976 On the other hand, in this liquid crystal display device, in the input signal scale, Gsi, Bsi R, G, b components, and the brewing, (5), Bsi) / ( 1 + 1/WR) The value of the match is assigned to the penetration of the w component. As a result, the input signal (R, G, B) = (5 〇, 6 〇, 40) represented by the RGB signal is converted into the amount of penetration expressed by the RGBW signal, G, b, W) = (20 ' 30 ' 1〇' 30). Further, in this pixel of interest, the backlight value is set to max(Rsi, Gsi, Bsi) / (1 + WR) = 30. In addition, each of the sub-pixels of R, G, B, and W is matched with the backlight value, that is, each transmittance in each of the sub-pixels of R, G, B, and W. Set to 67% (=20/30), 1〇0% (=3〇/3〇), 33% (=1〇/3〇), 100/. (30/30/WR). However, the transmittance shown in FIG. 3(4) is the largest among the plurality of backlight values determined by the pixel pixel not determined by the pixel of interest, and is used as the backlight source. The penetration rate of the brightness value used. Further, if the backlight value in the liquid crystal display device is compared with the backlight value obtained by the method of Patent Document 1, the area ratio of the sub-pixels must also be considered. In other words, in the liquid crystal display device, one pixel is divided into four sub-pixels, respectively, in the case of dividing the image into three fields* in the special (1). Therefore, 'assuming that each sub-pixel is equally divided, in order to compensate for the decrease in the area in the sub-pixel, the area of one sub-pixel is smaller than the area of the patent document in the liquid crystal display device. In the liquid crystal display device, the backlight value is set to 4/3 times, whereby it can be compared with the reference value obtained by the method of the patent document 相同. 127713.doc -18- 200844976 As a result, as long as the backlight value in Fig. 3 is corrected to the same reference value as the backlight value of Fig. 3(b), it becomes (4/3)x6〇/(i +wr 4〇 In the example of Fig. 3(b) for performing the same display, the backlight value is 6〇, so that the power consumption reduction effect according to the present invention in the above-mentioned attention pixel can be understood. 4(a) and 4(b), when using a liquid crystal panel having a white brightness ratio of &1; as min(Rsi, Gsi, Bsi) <max(Rsi, Gsi,

The way in which the backlight value in the pixel of Bsi)/(1 + 1/WR) is solved. Here, Fig. 4(a) is a view showing a manner of solving the backlight value in the liquid crystal display device. Further, Fig. 4(b) is a diagram for comparing the manners of solving the backlight values in the patent document. In the case of Fig. 4 (a) and (b), the panel output luminance of a target pixel is (R, G, B) = (50, 60, 20). At this time, the luminance value 60 of 〇 is max (Rsi, Gsi, Bsi), and the luminance value 2 of b is min (Rsi, Gsi, Bsi), which satisfies min (Rsi, Gsi, Bsi) < max (Rsi, Gsi, Bsi) / (1 + 1 / WR) relationship. In the display method of Patent Document 1, as shown in FIG. 4(b), the backlight value is set to max (Rsi, Gsi, Bsi) = 60, and the transmittance of each sub-pixel is matched with the backlight value. Decide. That is, each of the sub-pixels of R, G, and B has a 牙 setting of 83% (=50/60), 1% (=6〇/60), 33〇/〇 (=20). /60). On the other hand, in the liquid crystal display device of the present invention, among the components R, G, and B of the input signals Rsi, Gsi, and Bsi, the value of the damage associated with min (Rsi, (5), Bsi) is assigned to the W component. The amount of penetration. As a result, the input signal (R, G, B) = (50, 60, 2 〇) expressed by the rgb signal 127713.doc • 19· 200844976 is converted into the penetration amount represented by the RGBW signal (R, G). , b, w) = (3〇, 4〇, 〇, 2〇). Further, in this pixel of interest, the backlight value is set to (max(Rsi, Gsi, Bsi)_min(Rsi ', for example, Bsi)) = 4 〇. In addition, each of the sub-pixels of R, G, B, and W is determined by the value of the backlight. Each of the sub-pixels of R, G, B, and W is set to 75% (= 30/40), 100% (= 4 〇 / 4 〇), 〇 % (= 〇 / 4 () ),

50% (=20/40/WR). However, the transmittance shown in FIG. 4 (4) is the largest among the plurality of backlight values obtained by determining the backlight value found in the pixel of interest with respect to all pixels, and as the backlight The penetration rate of the brightness value used. In addition, in the example of Fig. 4 (4), by setting the backlight value to 4/3 times, it is possible to use the same reference value as that obtained by the patented female age 1 field search method. Comparison. As a result, in the example of Fig. 4 (4), the backlight value is (4) χ (6 〇 _ 2 〇) = 53.3. In the case of performing the same display, the backlight value is 6 〇, so that the effect of reducing the power consumption according to the present invention in the above-mentioned attention pixel can be clarified. Next, referring to FIGS. 15(a) and 15(b), it is described as "Heart (10)' W, Bsi)gmax (Rsi, Gsi) when using a liquid crystal panel with a white luminance ratio of WR of 1.5. , BSi) / 〇 + 1 / WR) The resolution of the backlight value in the pixel. Here, Fig. 15(a) is a view showing a method of solving the first source value of the liquid crystal display device. Further, Fig. 15(b) is a diagram for comparing the manner in which the backlight value in the patent document 1 is solved earlier. 127713.doc -20. 200844976 Consider the case where the output brightness of a target pixel is (R, G, B) = (l〇〇, 12〇, 80) in Fig. 15(4), (b)_. At this time, the luminance value 120 of G is max (Rsi, Gsi, Bsi), and the luminance value (10) of 3 is min (Rsi, Gsi, Bsi), which satisfies min (Rsi, Gsi, Bsi) gmax (Rsi,

Gsi, Bsi) / (l + i / WR) = 72 relationship. In the display method of Patent Document 1, as shown in FIG. 15(b), the tc degree value of the backlight is set to max (Rsi, Gsi, Bsi) = 12 〇, and the transmittance of each sub-pixel is matched with this. The backlight value is determined. That is, each of the sub-pixels of R, G, and B is set to .../.丨 丨 丨 ^, 1000/0 (= 120 / 120) 1670 / 0 (= 80 / 120) ° On the other hand, in this liquid crystal display device, the input signal ruler ",

Among the components of Rsi, G, and B of Gsi and Bsi, and max(Rsi, Gsi,

The value of Bsi)/(l + l/WR) is assigned to the penetration of the w component. As a result, the input signal (r, 〇, b) = (1 〇〇, 120 ' 80) represented by the RGB signal is converted into the amount of penetration expressed by the RGBW signal (R, G, B, W) = (28, 48, 8, 72). Further, in this pixel of interest, the backlight value is set to max (Rsi, Gsi, Bsi) / (1 + WR) = 48. In addition, each of the sub-pixels of R, G, B, and W is determined by the brightness of the backlight from the backlight value. Since the w sub-pixel is WR times brighter than the RGB sub-pixel bright white luminance, the backlight value necessary for the W sub-pixel penetration can be calculated by 1/WR times the backlight value necessary for the RGB sub-pixel. That is, each of the sub-pixels of R, G, B, and W is set to 58% (=28/48), 100% (=48/48), 16.70/〇 (=8/48). , 100% (=72/48/WR). 127713.doc -21 - 200844976 = The penetration of (4) is the largest among the multiple values of the backlight value obtained in Note 2 relative to all pixels, and as the backlight The tooth penetration rate when the brightness value is used. In addition, in Fig. 1), the brightness of the backlight is also slashed by 4/3 times, that is, it can be used as the disk, and P iu is the same as the backlight value obtained by the method of the patent document. Benchmark to compare.

One is to correct the backlight value in the example of Fig. 15 (4) to the same reference value as the backlight value of Fig. 15 (8) to become (MM, in the example of Fig. 15 (b) in which the same display is performed, the backlight value It is 12 〇, so it is possible to use the power consumption effect according to the present invention in the above-mentioned 4 mesh pixels. Then, $, , ?, and Figs. 16(a) and (b) illustrate the use of white luminance ratio Wei 15 In the case of a liquid crystal panel, as min(Rsi, Gsi, Bsi) <max(Rsi,,

The solution of the backlight value of the pixel of Bsi)/(1 + 1/WR) is ten. Here, Fig. 16 (a) is a view showing a manner of solving the backlight value in the liquid crystal display device. Further, Fig. 16(b) is a diagram for comparing the manners of solving the backlight values in the patent document. In Fig. 16 (a) and (b), the output luminance of the target pixel of a certain pixel of interest is (R, G, B) = (100, 120, 7 〇). At this time, the luminance value 120 of G is max (Rsi, Gsi, Bsi), and the luminance value 7 of b is _ (Rsi, Gsi, Bsi), which satisfies min (Rsi, Gsi, Bsi) < max (Rsi, Gsi, Bsi) / (l + i / WR) relationship. In the display method of Patent Document 1, as shown in FIG. 16(b), the luminance value of the backlight is set to max (Rsi, Gsi, Bsi) = 12 〇, and each sub-pixel is 127713.doc -22- 200844976 The penetration rate is determined by the value of this backlight. That is, each of the sub-pixels of r, G, and B is set to 83% (= 100/120), 100% (= 120/120), and 58% (= 70/120). On the other hand, in the present liquid crystal display device, among the components R, G, and B of the input signals Rsi, Gsi, and Bsi, a value portion corresponding to min (Rsi, Gsi, Bsi) is distributed to the W component. Throughput. As a result, the input signal (R, G, B) = (100, 120, 70) represented by the rgB signal is converted into the amount of penetration expressed by the RGBW signal (r, g, B, W) = (30) , 50, 0, 70). Further, in this pixel of interest, the backlight value is set to (max(Rsi, Gsi, Bsi)-min(Rsi, Gsi, Bsi)) = 50. In addition, each of the sub-pixels of R, G, B, and W is set to 60% (-30/50), 100 〇/〇 (=50/50), 〇% (=〇/5〇). ), 93% (=70/507 WR) However, the transmittance shown in FIG. 16(a) is an example in which the backlight value found in the pixel of interest is obtained with respect to all pixels. The largest of the plurality of back φ light source values, and is used as the brightness value in the backlight value = transmittance. Further, in the example of Fig. 16 (4), the luminance value of the backlight is also set to be 4/3 times, which can be compared with the same reference value as the monthly light source value obtained by the method of Patent Document}. m, in the case of Fig. 16 (4), the backlight value becomes (4/3) χ (ΐ2〇_ 7〇) = 66.7. In the example of W16(b) for performing the same display, the backlight value is m', so that the power consumption reduction effect according to the present invention in the above-mentioned attention pixel can be understood. Next, referring to Figs. 17 (4) and (8), when the white brightness ratio is used, the 127713.doc •23-200844976 liquid crystal panel of 06 is used as min(Rsi, Gsi, Bsi)^max(Rsi, w,

The way in which the backlight value in the pixel of Bsi)/(1 + 1/WR) is solved. Here, Fig. 17 (a) is a view showing a manner of solving the backlight value in the liquid crystal display device. Further, Fig. 17 (b) is a diagram for comparing the manners of solving the backlight values in Patent Document i for comparison. In the case of Fig. 17 (a) and (b), the output luminance of the target pixel of a certain pixel of interest is (R, G, B) = (10, 120, 50). At this time, the luminance value 120 of G is max (Rsi, Gsi, Bsi), and the luminance value 50 of B is min (Rsi, Gsi, Bsi), which satisfies min (Rsi, Gsi, Bsi) ^ is still x (Rsi,

Gsi, Bsi) / (1 + 1 / WR) = 45 relationship. In the display method of Patent Document 1, as shown in FIG. 17(b), the luminance value of the backlight is set to max (Rsi, Gsi, Bsi) = 120, and the transmittance of each sub-pixel is matched with the backlight. The value is determined. That is, each of the sub-pixels of r, G, and B is set to 83 〇 / 〇 (= 100 / 120), 100% (= 120 / 120) ^ 42% (= 50 / 120) 〇 On the other hand, in the liquid crystal display device, the components R, G, and B of the input signals Rsi, Gsi, and Bsi are matched with max(Rsi, Gsi, Bsi)/(1 + 1/WR). The value is assigned to the penetration of the W component. As a result, the input signal (R, g, B) = (100, 120, 50) represented by the RGB signal is converted into the amount of penetration expressed by the RGBW signal (R, G, B, W) = (5) 5,75,5,45). Further, in this pixel of interest, the backlight value is set to max(Rsi, Gsi, Bsi) / (1 + WR) = 75. In addition, each of the sub-pixels of R, G, B, and W is set to 73% (= 55/75), 100% (= 75/75), 6.7% (= 5/75), 100. %(=45/75/ 127713.doc -24- 200844976 WR). The backlight, ..., and the tooth permeability obtained in the elements shown in π® wu) are exemplified as the largest among the attention image source values, and the plurality of back transmittances obtained by the factors. In addition, in Figure 17 (:, the value: the value of the use of the value is set to 4 / 3 times, that is, can also be used to compare the light source value of the light source to the same benchmark to compare the method of the literature 1 Back

If the backlight value in the example of Fig. 17 (4) is corrected to the same reference as the backlight value of Fig. (), it becomes (4/3) χ 75 Å. In the example of Fig. 17(b) for which the same display is displayed, the f-light source value is (2), so that the power consumption reduction effect according to the present invention in the above-mentioned pixel of interest can be understood. The receiver's Fig. 18(3), (13) shows that when using a liquid crystal panel with a brightness ratio of 〇6, as min(Rsi, Gsi, Bsi) <max(Rsi, Gsi,

The way in which the backlight value in the pixel of Bsi)/(1 + 1/WR) is solved. Here, Fig. 18(a) is a view showing a manner of solving the backlight value in the liquid crystal display device. Further, Fig. 18(b) is a view showing a manner of solving the backlight value in Patent Document 1 for comparison. ‘In the case of Fig. 18 (a) and (b), the target output of a certain pixel is (R, G, B) = (100, 120, 40). At this time, the 焭 value 120 is max (Rsi, Gsi, Bsi), and the brightness value 40 of B is min (Rsi ' Gsi, Bsi), which satisfies min (Rsi, Gsi, Bsi) < max (Rsi, Gsi, Bsi) / (l + i / WR) relationship. In the display method of Patent Document 1, as shown in FIG. 18(b), the backlight value 127713.doc -25 - 200844976 is set to max (Rsi, Gsi, Bsi) = 120, and the transmittance of each sub-pixel is set. It is determined by the value of this backlight. That is, each of the sub-pixels of R, G, and B is set to 83% (=100/120), 100% (=120/120), and 33% (=40/120). In the liquid crystal display device, among the components R, G, and B of the input signals Rsi, Gsi, and Bsi, they will be related to min(Rsi, Gsi, Bsi).

The value of the symbol is assigned to the penetration of the W component. As a result, the input signal (R, G, B) = (l, 120, 40) represented by the rgb signal is converted into an output signal (r, 〇, b, w) = RGBW signal = ( 6Q, 80, 0, 40). Further, in this pixel of interest, the backlight value is set to (max(Rsi, Gsi, BSi)-min(Rsi, Gsi, Bsi)) = 8 〇. In addition, each of the sub-pixels of R, G, B, and W is set to 75 〇 / 〇 (= 60 / 80) ^ ΙΟΟ ο / ο ΜΟ / 80) . 〇〇 / 0 (= 〇 / 80) , 83〇/〇 (=40/80/ WR). However, the transmittance shown in FIG. 18(4) is the maximum of 4 among the plurality of backlight values obtained by determining the backlight value found in the pixel of interest with respect to all pixels as the backlight. When the backlight value is used = the transmittance. Further, in the example of Fig. 18 (4), by comparing the value of the backlight to Μ, it is possible to compare with the same reference value as the monthly light source value obtained by the method of Patent Document 1. As a result of the example of '_U', the backlight value is (4/3) χ (12 〇 40)-107. In the case of Βι_ which plays the same display, the backlight value = τ: clearly in the above-mentioned pixel of interest, according to the present invention:

The effect of reducing power consumption. + k θ I 127713.doc -26· 200844976 The above-mentioned FIG. 3, FIG. 4, and FIG. 15 to FIG. 18 are the explanations of the method for solving the minimum backlight value of (4), but each method is obtained by the above method. All the pixels in the display area corresponding to the backlight are necessary, and the limit is the light source value. The maximum value of the plurality of backlight values thus obtained is set as the luminance value of the backlight. The order of determining the backlight value and the sub-pixel transmittance in the present crystal display device according to the method described above will be described with reference to Figs. 5(4) to (4). Fig. 5 (4) is a wheel-in signal (RSi, Gsi, Bsi) for displaying a display area corresponding to a certain backlight. Here, in order to simplify the description, the white allowance ratio WR is set to 1, and the display area is composed of four pixels a to 〇. The actual white luminance ratio WR# is a value determined by the liquid crystal panel, which has a common value with respect to all pixels, which is a relatively large value. For these pixels A to D, the input signal (Rsi, & Bu converted to the output signal represented by the RGBW signal (Rtsi, tens, y, w...) is as shown in Fig. 5(b). In addition, the φ backlight value obtained for each pixel is as shown in Fig. 5(C), whereby the 'backlight value is set to a plurality of backlight values determined for each pixel. The maximum value, that is, 100 〇* relative to the thus obtained backlight value 100, the transmittance of each pixel, (rsi, gsi, bsi, ... 屮 is based on the output signal shown in Figure 5 (b) (Rtsi,

The value of Gtsi, Btsi, Wtsi) is obtained, and the result is as shown in Fig. 5(d). Further, the display luminance in each of the final pixels is a result shown in Fig. 5 (e), and it can be confirmed that the luminance values of the input signals (Rsi, Gsi, Bsi) shown in Fig. 5 (a) coincide. 127713.doc -27- 200844976 In the output signal generation unit 12 of the sound 1 output, the backlight value and the sub-image are processed by the sub-pixels in the white component:::: by the shirt The light absorbed by the color filter can reduce the backlight 16 ... power. Therefore, in the display image data, it is possible to assign to %: "the amount of white component light of the pixel" becomes a necessary condition for obtaining the effect of reducing the power consumption of the backlight.

. In the output signal generation unit 12, the backlight value and the sub-pixel transmittance are processed, and the amount of white component light that is distributed to the W sub-pixels in all the pixels in the display region corresponding to the backlight is large. (that is, when the chroma is low), the effect of reducing the power consumption of the backlight becomes large. On the other hand, if there is a white component light amount D (that is, a pixel having a high degree of purchase) assigned to the W sub-pixel in the display region corresponding to the backlight, the effect of reducing the power consumption of the backlight is not small, and the right is When the degree of twist is high, the power consumption may be increased as compared with the display method of Patent Document 1. In the following, an example of setting the backlight value of two pixels having the same degree of freedom and different chroma levels when using a liquid crystal panel having a white luminance ratio of WR is shown. When the pixel A (brightness = 208, saturation = 〇 · 533) of the first '(R ′ G, B) = (176, 240, 112) is used, the backlight value is calculated in the following manner. In the pixel A, the amount of light allocated to the sub-pixel is (112). Further, the amount of light of the R, G, and 6 sub-pixels to which the amount of light allocated to the W sub-pixel is subtracted is (64, 128, 〇). As a result, the backlight value set in the pixel a becomes (128). On the other hand, when (R, G, B) = (16 〇, 256, 64) pixel B (brightness = 208, saturation = 0.75), the backlight value is calculated in the following manner. 127713.doc -28- 200844976 In pixel B, the amount of light allocated to the W sub-pixel is (64). Further, the amount of light of the R, G, and B sub-pixels to which the amount of light allocated to the w sub-pixel is subtracted is (96, 1 92, 0). As a result, the backlight value set in the pixel B is (192). As described above, when the pixel A and the pixel β are compared, although the luminances are equal, the backlight value is set to be larger by the pixel having a higher chroma, and the effect of reducing the power consumption of the backlight is small. φ The output number generating unit 12 calculates the backlight value and the sub-pixel transmittance by the above-described processing on the original image data (i.e., the first input RGB signal) input to the liquid crystal display device. However, at this time, for the above reasons, it is not necessary to obtain a power consumption reduction effect for all the images (in addition, 'Beibei' is available in the normal midtone display screen where the display opportunity is considered the most, and the power consumption reduction can be obtained. There are more cases of effects). Therefore, in the liquid crystal display device of the present invention, the chroma reducing unit 11 is placed in the preceding stage of the output signal generating unit 12, and the i-th input RGB signal is subjected to the chroma reduction processing to be converted into the second input RGB signal. Thereby, in the processing in the output signal generating portion 12, the effect of reducing the backlight consumption power can be more surely obtained. The chroma reduction processing in the chroma reduction unit 1 is described in detail below. FIG. 6 is a block diagram showing a schematic configuration of the chroma reduction unit u. The chroma reduction unit 11 includes a backlight upper limit value calculation unit 21 and a signal conversion unit 22 as shown in Fig. 6 . The backlight upper limit calculation unit outputs the RGBk upper limit value, the white luminance ratio WR, and the backlight value setting rate as the light source upper limit value, and outputs the backlight upper limit value to the signal. Conversion 127713.doc -29- 200844976 The conversion unit 22 calculates the second input RGB signal from the first round RGB signal and the backlight upper limit value output from the backlight upper limit calculation unit 21. Output it. T 7 is a flowchart for explaining the operation of the chroma reduction unit 11. In S11, the backlight upper limit value calculation unit 21 calculates the back value and the limit value (S11). In the chroma reduction unit ,1, the amount of light directly allocated to the w sub-pixels is small (that is, the chroma is high), and the chroma reduction processing is performed only for the pixels having higher luminance, but for chroma or brightness. If at least one of the cars is low, the chroma processing is not performed. This is because the lower the pixel t, even if the brightness is higher, for example, the backlight value can be greatly reduced by distributing a larger amount of light to the W sub-pixel, and in addition, the pixel is displayed in the lower-brightness pixel. There is no need for a higher backlight value. The above-mentioned backlight upper limit value is used to determine which pixel should be subjected to chroma reduction processing. The calculation procedure for the upper limit value of the backlight will be described in detail as follows. First, consider the case where the chroma data reduction processing is not performed for the image data (that is, the input RGB signal), and the backlight value becomes the maximum. This is a case where the chroma is U cannot share the amount of light (sub-pixel), and at least one of the RGB values is the presence of a pixel (meaning the upper limit of the input RGB signal). In addition, the backlight value at this time also becomes ΜΑχ. Next, a case where the chroma processing is reduced for the image data (i.e., the input fine signal) is considered, and the case where the backlight value becomes maximum is considered. Further, the chroma reduction processing in j is a process for minimizing the chroma without changing the brightness before and after the strict processing of the pixels subjected to the processing. At this time, the color 2 is 〇 (the chroma cannot be reduced, so the backlight value cannot be lowered). 2 127713.doc -30· 200844976 The RGB value is the largest backlight value when all the pixels of MAX are present. Here, since the W sub-pixel system can emit light WR times brighter than the RGB sub-pixel, in the above-mentioned pixels, WR/(1+WR) of the light amount in each of the RGB values can be assigned to the W sub-pixel, and Assigning 1/(1+WR) to each RGB sub-pixel becomes the most efficient backlight. The backlight value at this time becomes MAX/(1+WR). Therefore, the backlight upper limit value MAXw ranges from MAX/(1+WR) to MAX, and when the BIRatio range is set to 1/(1+WR) to 1.0, the backlight upper limit value MAXw can be as follows. It is expressed by the formula (1). MAXw=MAXxB 1 Ratio (1) In addition, the term "MAX" as used herein refers to the upper limit of the input RGB signal, and is not limited to one value, but a plurality of values may be considered. That is, the lower limit of MAX is the maximum value (MAXi) of all RGB values of the input RGB signal. This is because if MAX is set to a value smaller than MAXi, it is not guaranteed to be the desired backlight value. On the other hand, the MAX upper limit is the maximum value of the input signal that can be obtained (MAXsh does not require a larger backlight value than MAXs. When the bit width of the input RGB signal is set to Bw) MAXs is expressed by the following equation: MAXs=2Bw-1 For example, when Bw is 8, MAXs is 28-1=255. Therefore, the range of effective MAX is expressed by the following equation: MAXi ^ MAX ^ MAXs 127713.doc -31 - 200844976 Basically, in terms of MAX setting, as long as MAXiSMAXSMAXs is satisfied, it can be any value. If it is set to MAX=MAXi, Bay 4 can reduce the backlight value. Only MAX is calculated for each image. On the other hand, if it is set to MAX=MAXs, the backlight upper limit value (MAXw) will become higher than MAXi, but MAX will become a certain value that does not depend on the image, so there is no need to rely on each image. In addition, in the above formula (1), the B 1 Ratio is a constant indicating the degree of chroma reduction processing, that is, when the B 1 Ratio is 1, it is equivalent to the case where the chroma reduction processing is not performed. And BIRatio is 1/(1+WR), which is equivalent to the process of minimizing chroma. In the above-mentioned chroma reduction processing, the more the chroma is reduced, the greater the reduction effect of the backlight power consumption, but the degree of deterioration of the image quality caused by the reduction in chroma is also increased. Considering the balance between the reduction effect of power consumption and the deterioration of image quality, BIRatio can be arbitrarily set in the range of 1/(1+WR)~1 according to the required chroma reduction level. The upper limit value MAXw is next determined in S12, that is, whether or not the chroma reduction processing is performed for each pixel according to the following formula (2). MAXw < maxRGB-minRGB (2) Only in the above formula (2) , maxRGB=max(Ri, Gi, Bi) minRGB=min(Ri, Gi, Bi) 〇 In a certain pixel of interest, when the RGB value satisfies the above formula (2), the pixel of interest is determined to be maintaining In the state, the backlight value is a pixel that exceeds the brightness and chroma of the backlight 127713.doc -32- 200844976 source upper limit MAXw. Therefore, for this kind of pixel, the chroma reduction is performed by S13. In addition, 'by this chroma reduction treatment' at the point of color sharpness Although the image quality of the input image is degraded, in the general image, the part with high brightness and high chroma is not so much, and the portion with reduced chroma is mostly limited to one part of the image. Furthermore, the visual characteristics of human are compared. The change in brightness is not so sensitive to changes in color, so the deterioration of image quality caused by reduced chroma is mostly unrecognizable. On the other hand, in the visual characteristics of humans, the change in brightness is recognized as a large deterioration in quality. Therefore, in this chroma reduction processing, it is important that the luminance is not changed, but only the chroma is reduced by 0. On the other hand, the pixel of the above formula (2) is not satisfied in S12, and it is determined that even in this state. The backlight value is also a pixel that does not exceed the brightness or chroma of the backlight upper limit MAXw. For this type of pixel, the chroma data reduction processing is not required, and the pixel data in the first input RGB data is directly used in the second input RGB data. Here, the reason why the above formula (2) is used for determining whether or not the chroma reduction processing for the pixel of interest is determined is explained. First, the calculation formula of the W sub-pixel penetration amount Wti when the chroma reduction is not performed is the following formula (3).

Wti=min(maxRGB/(l + l/WR) > minRGB)* * (3) Furthermore, the amount of penetration of RGB sub-pixels (Rti, Gti, Bti) is as follows (4)~( 6).

Rti=Ri-Wti · · ·(4) 127713.doc -33· 200844976

Gti=Gi-Wti ...(5)

Bti=Bi-Wti -- (6) In the above equations (3) to (6), each of the RGBW penetration amounts does not have a Wti exceeding minRGB, so the value is not lower than 〇. Then, the conditions for each of the RGB penetrations not exceeding MAXw are as follows (7) to (9) 〇

Rti^MAXw ...(7)

Gti^MAXw ...(8)

Bti^MAXw *(9) On the other hand, the W penetration does not exceed the condition of MAXw, and the W sub-pixel emits light at WR times with respect to the RGB sub-pixel. Therefore, the value of Wti is divided by WR to become a condition that does not exceed MAXw. From the above formula (3), and finally to the following formula (10).

Wti/WR^MAXw, therefore,

Min(maxRGB/(l + l/WR), minRGB) SMAXwxWR (10) From the above equations (3) to (6), and (7) to (9), R (3B penetration amount does not exceed The condition of MAXw is the following (11). max(Rti, Gti, Bti)SMAXw maxRGB-Wti^MAXw Therefore, maxRGB-min(maxRGB/(l + i/WR), minRGB) $MAXw .(11) 127713.doc -34. 200844976 Here, when (A) maxRGB/(l + l/WR)gminRGB, the condition that the W penetration does not exceed MAXw is derived from the above formula (10), maxRGB/(1 +1 / WR) ^ MAXwx WR is therefore maxRGB/(l+WR)SMAXw . (12). In addition, MAXw is in the range of MAX/(l+WR)SMAXw^MAX, so it becomes maxRGB/(l+WR)SMAX/( l+WR) 'MAXw, the above formula (12) is always true. Next, the condition that the RGB penetration does not exceed MAXw is derived from the above formula (11), maxRGB-maxRGB/(l + l/WR) ^ MAXw It is maxRGB/( 1+WR) ^ MAXw The above equation is the same as the above formula (12), so it is always true. On the other hand, the condition that the W penetration does not exceed MAXw is derived from the above formula (10).

minRGB ^ MAXwx WR At this time, it is derived from MAX/(l + WR)SMAXw$MAX and minRGB<maxRGB/(l + l/WR) to become minRGB<maxRGB/ (1 + 1 / WR)=WRx maxRGB/( 1 + WR) ^ WRx M AX/( 1 + WR) ^ MAXw xWR, the above formula is always true. Then, the condition that the RGB penetration amount does not exceed MAXw is from the above (11) 127713.doc -35 - 200844976 and becomes maxRGB-minRGB ^ MAXw (13) The above formula (13) is not always true, so The condition that all of the RGBW penetration amounts do not exceed MAXw is the above formula (13) when (B) min RGB < max RGB / (1 + 1 / WR). On the other hand, the condition that at least one of the RGBW penetration amounts exceeds MAXw is (B) min RGB < max RGB / (l + l / WR) becomes the above formula (2). When (2) above is established, it is derived from MAX/(l+WR)SMAXw$MAX

maxRGB/(l + l/WR)^MAX/(l + l/WR)

=WRxMAX/(l+WR)^MAXwxWR

<(maxRGB-minRGB)x WR

maxRGB/(l + l/WR)<(maxRGB-minRGB)xWR thus becomes minRGB <maxRGB/( 1 +1 / WR), that is, (B)minRGB<maxRGB/(l + l/WR) is always Established. Therefore, the condition that at least one of the RGBW penetration amounts exceeds MAXw is unconditionally the above formula (2). That is, when Ri, Gi, and Bi satisfy the above formula (2), the chroma reduction processing is performed so that the backlight value does not exceed MAXw. Next, the chroma reduction processing performed for the pixels whose chroma and luminance are both determined to be high will be described in detail based on the above formula (2).

In the pixel conversion unit 22, the chroma conversion unit 22 performs the chroma reduction processing using the following (16) to (19), and the first RGB signal before processing (Ri). , Gi, Bi) is converted to the second RGB 127713.doc -36- 200844976 signal (Rsi, Gsi, Bsi).

Rsi=axRi+(l-a)xYi ...(16)

Gsi=axGi+(l-a)xYi ...(17)

Bsi=axBi+(la)xYi ·,·(18) a=MAXw/(maxRGB-minRGB) (19) However, in the above equations (16) to (18), Yi is an input RGB signal (Ri, Gi, The brightness of Bi) (for example, Yi = (2xRi + 5xGi + Bi) / 8). Here, the process of introducing the equations (16) to (19) of the above-described calculation formula of the chroma reduction processing will be described. First, the RGB signal conversion type in which the luminance and the hue are not changed, and the RGB signal is reduced in accordance with the above formula (20) to (18). 0<α<1 .. (20) The above formulas (16) to (18) have not changed the brightness and hue of the rgb signal before and after the chroma reduction treatment as follows. First, if the calculation formula of the luminance when the RGB value is (R, G, B) is (2xR + 5xG + B) / 8, the luminance Yi after the saturation is reduced with respect to the luminance Yi before the chroma reduction. It is represented by the following formula (21).

Ysi=(2 xRsi + 5 xGsi+Bsi)/8 *'*(21) If the above formulas (16) to (18) are substituted into the above formula (21), it is as shown in the following (22).

Ysi=ax(2xRi+5xGi+Bi)/8+(la)xYi=axYi+(la)xYi=Vi 1 (22) From the above formula (22), it is known to use the above formula (16) to (1 8) The chroma reduction is 127713.doc -37- 200844976 The brightness is not changed before and after processing. On the other hand, regarding the hue, first, consider the case where the R value is maximum. The hue Hi before the R value is the maximum is shown in the following (23). Hi=(Cb-Cg)x60^-(23) only,

Cb=(maxRGB-Bi)/(maxRGB-minRGB)

Cg=(maxRGB-Gi)/(maxRGB-minRGB)

Next, the hue Hsi after the chroma reduction treatment is as shown in the following (24). Hsi=(Cbs-Cgs)x60 ,··(24)

Cbs=(maxRGBs-Bsi)/(maxRGBs-minRGBs) Cgs=(maxRGBs-Gsi)/(maxRGBs-minRGBs) maxRGBs=max(Rsi,Gsi,Bsi) minRGBs=min(Rsi,Gsi,Bsi) If the above ( The deformation of the formula 24) is further substituted into the equations (16) to (18), as shown in the following (25).

Hsi={(maxRGBs-Bsi)-(maxRGBs-Gsi)}/ (maxRGBs-minRGBs)x60 = {(Gsi-Bsi)/(maxRGBs-minRGBs)} x60 =ax(Gi-Bi)/{ax(maxRGB- minRGB)}x60 = {(Gi-Bi)/(maxRGB-minRGB)}x60 = {(maxRGB-Bi)-(maxRGB-Gi)}/ (maxRGB-minRGB)x60 =(Cb-Cg)x60 127713.doc -38- 200844976 = Hl (25) From the above formula (25), it is understood that the chroma reduction treatment using the above formulas (16) to (18) does not cause the hue change before and after the treatment. The same is true for depreciation, or when the B value is maximum. Next, in the above equations (16) to (18), the backlight value is derived as α of the backlight upper limit value MAXw. For all the pixels satisfying the formula (2), the backlight value must be equal to or less than MAXw as long as the chroma is reduced to satisfy the following formula. MAXw=maxRGBs-minRGBs From (16) to (18), and above, you can derive axmaxRGB+(la)xYi.axminRGB.(la)xYi=MAXw ax(maxRGB-minRGB)==MAXw Therefore, a=MAXw/( maxRGB-minRGB) In this manner, the chroma reduction unit 11 converts the first input RGB signal into the second input RGB signal for input to the output signal generating unit 12 in the subsequent stage by the processing described above. That is, the second input-deleted signal is a pixel material (four) that converts pixel data having a higher luminance and chroma in the m-th input RGB signal into a salty low chroma. In addition, the pixel data with lower brightness or chroma in the second input rgb signal is not converted, and the original data is also directly used in the second input coffee "ί吕. Next, an outline of the output signal generating unit will be described with reference to FIG. 8. As shown in FIG. 8, the rotation signal generation unit 12 includes a w penetration amount calculation unit 3, 127713.doc • 39-200844976 RGB penetration amount calculation unit 32, a backlight value calculation unit 33, and a transmittance calculation unit. 34 constitutes. Further, Fig. 9 is a flowchart for explaining the operation of the output signal generating portion 12. The W penetration amount calculation unit 3 1 calculates the W penetration amount using the second input RGB signal input from the chroma reduction unit 11 (S21). Wtsi=min(maxRGBs/(l + l/WR), minRGBs) • (26) This W penetration amount is output to the RGB penetration amount calculation unit 32, the backlight value calculation unit 33, and the wearer. The transmittance calculation unit 34. The RGB penetration amount calculation unit 32 calculates the RGB penetration amount from the second input RGB signal and the W penetration amount using the following equations (27) to (29) (S22).

Rtsi=Rsi-Wtsi .(27)

Gtsi=Gsi_Wtsi ...(28)

Btsi=Bsi-Wtsi . (29) This RGB penetration amount is output to the backlight value calculation unit. The processing of the above S21 and S22 φ is repeated corresponding to the number of pixels in the input RGB signal. The backlight value calculation unit 33 calculates the RGBW penetration amount of all the pixels in the image output from the W penetration amount calculation unit 31 and the RGB penetration amount calculation unit 32, and calculates the following equation (33). The backlight value in this image • Wbs (S23).

Wbs=max(Rtsl, Gtsl, Btsl, Wtsl/WR,

RtsNp, GtsNp, BtsNp, WtsNp/WR) 127713.doc -40- 200844976 Alternatively, the backlight value calculation unit 33 may output the W penetration amount calculation unit 31 and the RGB penetration amount calculation unit 32. The RGB penetration amount other than the W penetration amount among the RGB W penetration amounts of all the pixels in the image is calculated by the following formula (34) to calculate the backlight value Wbs in the image. When the W penetration amount Wts is obtained by the above-described method, the RGB penetration amounts Rts, Gts, and Bts are necessarily max (Rts, Gts, Bts) 2 Wts/WR.

Wbs=max(Rtsl, Gtsl, Btsl,

RtsNp, GtsNp, BtsNp) (34) This backlight value Wbs is output to the transmittance calculation unit 34. The transmittance calculation unit 34 is the RGBW penetration amount output from the W penetration amount calculation unit 31 and the RGB penetration amount calculation unit 32, and the backlight value Wbs output from the backlight value calculation unit 33, The transmittance of each sub-pixel is calculated using the following equations (3 5) to (3 8) (S24). The processing of the above S24 is repeated corresponding to the number of pixels in the input RGB signal. Rsi=Rtsi/Wbs . .(35) gsi=Gtsi/Wbs,···(36) bsi=Btsi/Wbs (37) wsi=Wtsi/Wbs/WR ***(38) So, in this implementation In the liquid crystal display device of the embodiment, before the output signal generating unit 12 calculates the backlight value and the RGBW transmittance, the chroma value reduction processing is performed on the input RGB signal as the original input, whereby the backlight value can be surely reduced. 127713.doc -41 - 200844976 For example, when using a liquid crystal panel with a white luminance ratio of WR=1, if it is considered by the pixel B of (R, G, B) = (160, 256, 64) exemplified above, then The backlight value when the chroma reduction processing is performed is 192. On the other hand, when the chroma reduction processing is performed on the pixel B with MAX=256 and BiRati〇==1/(1+WR)=0.5, the chroma of the pixel B in the second input RGB signal is reduced. The pixel values are derived as follows. ' MAXw=MAXxBlRatio=256x〇.5 = 128 (derived by (1)) α=128/(256-64)=2/3 (derived by (19)) • Yl=(2xRl+5xGl+Bl) /8 =(2χ160+5x25 6+64)/8=208 Rsl=axRl+(la)xYl =(2/3)χ160+(1-2/3)χ208 = 176 (derived by (16)) Gsl=axGl+ (la)xYl = (2/3)χ256+(1-2/3)χ208=240 (derived by (17))

Bs 1 =αχΒ 1 +(1 -a)x Y1 _ =(2/3)x64+(l-2/3)x208=112 (derived by (18)) Therefore, the chroma in Pixel B is reduced The input rgb value is (176, 240, 112), and the backlight value is 128. • That is, with chroma reduction, the backlight value can be reduced from 192 to • 128 (approximately 33% reduction). Further, the chroma reduction processing carried out in the liquid crystal display device can also vary the degree of mRati ( in the formula (1) by a range of 1/(1 + WR) 〜1. In other words, in the liquid crystal display device, by the function of changing the value of BlRat1〇, the user can arbitrarily select the 127713.doc -42·200844976 priority (increase the value of the leg coffee) or Power saving priority (reducing the value of BlRatio). Further, at this time, if the value of BlRatio is set to 1, the above-described % degree reduction processing is not performed. Therefore, the execution of the above-described chroma reduction processing or the non-execution may be selected. In the liquid b display device, the backlight 6 is basically relative to a plurality of pixels. Set one more. Therefore, for example, the liquid crystal display device shown in Fig. 1 is a configuration in which the white moon light source 16 corresponds to the entire display surface of the liquid crystal panel 14. However, the invention is not limited thereto, and the liquid crystal panel can be divided into a plurality of regions by the display surface, so as to have a plurality of backlights according to the brightness adjustment of each region. Composition. Although Fig. 1 shows an example in which two white backlights are provided for one display area, the number of backlights is not limited. The liquid crystal display device shown in FIG. 10 includes a chroma reduction unit 11, an input signal division unit, output signal generation units 12a and 12b, liquid crystal panel controls 13a and 13b, a liquid crystal panel 14, backlight control units 15a and i5b, and The white backlights 16a and 16b are constructed. The input signal dividing unit 41 assigns the second input RGB signals of the two sides input from the chroma reducing unit u into signals of two areas, and inputs the input RGB signals of the respective areas to the output signal generating unit 12a&;i2b. The output signal generating units 12a and 12b perform processing equivalent to the output signal generating unit 12 in the figure for each corresponding region. The liquid crystal panel control units 13a and 13b perform the same processing as the liquid crystal panel control unit 13 in FIG. 1 for each corresponding region, but each control unit controls the position corresponding to the region corresponding to the liquid crystal panel 14. Pixel wear 127713.doc -43- 200844976 penetration rate. The backlight control units 15a and 15b perform processing equivalent to the backlight control unit 15 in Fig. 1 for each corresponding region. The white backlights i 6a and the 讣 are respectively the same structure as the backlight 16, but each backlight is used to separately illuminate the corresponding area. Thus, by dividing one screen into a plurality of areas and performing control in the area unit, the backlight value can be further reduced. Further, in the present embodiment, although one screen is divided into two regions, it is also possible to divide into three upper regions for control. In the general image, the vicinity of the region has a similar color continuity. Therefore, as shown in Fig. 10, by dividing the backlight region into d, the backlight of the backlight region collecting the darker pixels can be made darker. As a result, the overall backlight power consumption can be reduced by dividing the backlight compared to when the backlight is not divided. The processing of the shape reducing unit 11 and the output signal generating unit 12 is realized by a software that can be operated on a personal computer. The following describes the order in which the above processing is implemented in software. Fig. 11 is a view showing the system configuration when the above processing is realized by software. The above system is constituted by the personal computer main body 51 and the input/output device 55. In addition, the personal computer body 5 includes a CPU 52, a memory 3, and a wheel access interface 54. The input/output device 55 includes a memory medium%. The first CPU 52 controls the input/output device via the input/output interface 54, and the chroma is reduced from the memory medium 56. The output signal generation program and the parameter broadcast program (the input RGB signal upper limit value and the backlight value setting rate) Or, the area f") used when dividing the surface into a plurality of areas, and the input image poor material are read and stored in the memory 53. Furthermore, the CPU 52 reduces the chroma from the memory 53. The output signal generation program, the parameter (4), and the input image data are read, and the commands are generated according to the private product reduction output signal generation program. Wheeling diagram: After the tribute is reduced in saturation and the output signal is generated, the input/output device 55 is controlled via the input/output interface 54, and the backlight value and the RGBW transmittance after the wheeling signal is generated are output to the memory medium. 56. 7. As shown in FIG. 12, the backlight source value 'and the RGBW transmittance after the output signal is generated may be output to the backlight control unit 15 and the liquid crystal panel control unit 13' via the input/output interface 54, respectively. The white backlight / and the liquid crystal panel 14 are controlled to actually display an image. Thus, in the above system, the aforementioned chroma reduction and output signal generation can be performed on a personal computer. As a result, it is possible to confirm the validity of the chroma reduction method or the output signal generation method and the effect of reducing the backlight value before actually performing the chroma reduction unit or the illusion f generation unit. The above-mentioned P-transmission liquid crystal display device includes a liquid crystal panel that divides 1 pixel into red (R), green (G), blue (B), and white (w) 4 fields &quot Pixel 'white active backlight' which controls the brightness of the light; the chroma is reduced. In the pixel data included in the first input RGB signal as the wheeled image, the pixel data having higher luminance and chroma is subjected to chroma reduction processing, and the ith input RGB signal is converted into a second input deletion signal; an output signal generation unit that generates a penetration of each of the sub-pixels R, G, B, and w in each of the liquid crystal panels from the second input rgb signal 127713.doc -45- 200844976 rate is different from the backlight value in the active backlight; the liquid crystal panel control unit 'drives and controls the liquid crystal panel based on the above-mentioned penetration rate generated by the above-mentioned wheel signal generating unit; and The backlight control unit 'controls the light emission luminance of the backlight based on the calculated backlight value.

According to the above configuration, by using a liquid crystal panel in which one pixel is divided into four sub-pixels of R, G, B, and W, one of the color components of ^r, b can be allocated to none (or less) because of filtering. The amount of light loss caused by the absorption of the light sheet: the W sub-pixel. As a result, the light absorbed by the color filter can be reduced, and the backlight value can be reduced in accordance with this, so that the power consumption in the transmissive liquid crystal display device can be reduced. Furthermore, by performing chroma reduction processing on the input RGB signal as the original input, and calculating the backlight value and the RGBW transmittance based on the second input RGB signal subjected to the chroma reduction processing, It really reduces the backlight value. Further, in the transmissive liquid crystal display device described above, in the pixel data in which the chroma reduction unit is subjected to the chroma reduction processing, only the color and the hue are changed before and after the chroma reduction processing. The composition of the degree reduction is preferred. According to the above configuration, by reducing the chroma and the hue which have a large influence on the visual characteristics of a person, and reducing only the chroma which has less influence on the visual characteristics, the suppression can be suppressed as the chroma reduction processing is performed. In the above-described transmissive liquid crystal display device, it is preferable to form a color 127713.doc • 46-200844976 degree reduction unit to change the degree of chroma reduction processing. Further, the range of the degree of chroma reduction treatment is preferably a configuration in which the range can be changed depending on the characteristics of the liquid crystal panel to be used. One of the characteristics of the liquid crystal panel is a white luminance ratio WR which is a ratio of the brightness of white of the W sub-pixel to the brightness of white by the RGB sub-pixel when the transmittance of each RGBW sub-pixel is the same. • According to the above configuration, the user can selectively set the balance between the power consumption reduction effect by the chroma reduction processing and the image quality deterioration caused by the chroma reduction processing. Further, in the above-described transmissive liquid crystal display device, the chroma reduction unit may be configured to include luminance in a pixel data included in a first input RGB signal as an input image in the order of (A) below. And the pixel data with higher chroma is extracted, and for the extracted pixel data, the composition of the chroma reduction processing is applied by the following sequence (B). (A) Calculate the upper limit of the backlight by MAXw=MAXxBlRatio • MAXw, and will satisfy

The pixel data of MAXw<maxRGB-minRGB^ is extracted as pixel data with higher brightness and chroma. - Only set as follows: MAX : Upper limit value of backlight value when chroma processing is not performed WR : White brightness ratio BIRatio : Backlight value setting rate (l/(l+WR)$BlRati〇S1.0) maxRGB=max(Ri,Gi,Bi) 127713.doc -47- 200844976 minRGB==niin(Ri ? Gi j Bi)

Ri, Gi, Bi (i=l, 2, ···, Np) ·· The first input RGB signal, the RGB value of the pixel

Np : the number of pixels of the input image max (A, B, ...): the maximum value of A, B, ... min (A, B, ...) · · A, B, · · · the minimum value (B) for the The extracted pixel data is obtained by the following formula to obtain the pixel data after the chroma reduction processing.

Rsi=axRi + ( 1 -a)x Yi Gsi=axGi+(l - a)x Yi Bsi=axBi+(l -α)χ Yi Only set as follows: 丄Np) ·Different 2 input RGB letter

Rsi, Gsi, Bsi (the RGB value of the attention pixel after the chroma reduction of i=l is Yi(i = l ' 2,..., Np): the brightness of the pixel of interest a=MAXw/(maxRGB-minRGB) The transmissive liquid crystal display device may be configured as follows. The output signal generating means includes a cargo penetration amount calculating unit that transmits the amount of penetration of each sub-pixel by the order of (4) below (10) The RGB penetration amount calculation unit calculates the penetration amount (Rtsi, Gtsi, Btsi) of each == in the order of (8) below; the backlight: heterogeneous:, by the following ( In the order of C), the backlight value conversion and the tooth permeability dissipating mechanism are calculated, and the tooth permeability (rsi, of each dirty sub-image f is obtained by the following order of (D) Xin's penetration 仏·.u () Gsl, bsi, called to calculate. 127713.doc -48- 200844976 (A) by

The W penetration rate (Wtsi) is calculated by the equation of Wtsi = min (maxRGBs / (l + l / WR), minRGBs). Only set as follows: maxRGBs=max(Rsi,Gsi,Bsi) minRGBs=min(Rsi,Gsi,Bsi) β (B) by

Rtsi = Rsi - Wtsi Gtsi = Gsi - Wtsi Btsi = Bsi - Wtsi The RGB penetration (Rtsi, Gtsi, Btsi) is calculated. (C) by

Wbs=max(Rtsl, Gtsl, Btsl, Wtsl/WR

RtsNp, GtsNp, BtsNp, WtsNp/WR)

The formula calculates the backlight value (Wbs). Or, instead of using W subpixel penetration,

Wbs=max(Rtsl, Gtsl, Btsl,

RtsNp, GtsNp, BtsNp) is calculated. (D) by rsi=Rtsi/Wbs gsi=Gtsi/Wbs 127713.doc -49- 200844976 bsi=Btsi/Wbs

Wsi=Wtsi/Wbs/WR The RGBW penetration rate (rsi, gsi, bsi, wsi). However, when Wbs=0, it is set to rsisgsirrbsi^wsisO. Further, in the transmissive liquid crystal display device described above, the following configuration may be adopted: a plurality of active backlights are included with respect to the liquid crystal panel, and

For each area corresponding to each active backlight, the transmittance control of the liquid crystal panel and the backlight value control of the backlight are performed. According to the above configuration, by dividing the backlight, an optimum backlight value can be set for each of the divided backlight regions, and the overall backlight power consumption can be reduced. The specific embodiments and examples in the detailed description of the θ invention are only to clarify the technical content of the present invention, and should not be limited to the specific examples and are interpreted in a narrow sense 'in the spirit of the present invention and the following Within the scope of the claimed patent claims, various changes can be made and implemented. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the main components of the present invention in which the liquid crystal display is displayed. Fig. 2 (4) and (b) are diagrams showing an arrangement example of the above-described transmissive liquid crystal display. τ < Μ image Figure 3 (4) shows the liquid crystal display | the pattern of the towel, and Figure 3 (b) is the solution for solving the solution. 29 The backlight value θ () in the non-patent document ^ is a solution for the backlight value in the liquid crystal display device 127713.doc -50- 200844976, and FIG. 4(b) is for comparison. A diagram showing the way the patent is solved. The source value of the backlight source and FIGS. 5(a) to 5(e) are diagrams showing the order of determining the sub-pixel transmittance in the liquid crystal display device. The moonlight pattern 6 is the point at the liquid crystal display device. Fig. 7 is a flowchart showing the operation sequence of the chroma reduction unit. Fig. 8 is a view showing the configuration of the wheel out in the liquid crystal display device. Example block diagram U. Fig. 9 is a flow chart showing the operation sequence of the output signal generating unit. Fig. 10 is a view showing the other aspects of the present invention, and the main part of the liquid crystal display device. Fig. 11 is a view showing a configuration in which a display control processing system is realized by software in the present invention. Fig. 12 is a view showing a modification of the configuration in which the display control processing is realized by software in the present invention. Fig. 13 is a cross-sectional view showing a general configuration of a transmissive liquid crystal display device. Fig. 14 is a view showing an arrangement example of a transmissive liquid crystal display device. Backlight Figure 15(a) is Figure 15 (b) is a diagram showing the solution of the patent document value for comparison. 127713.doc •51 · 200844976 Figure 16 (4) material (4) This liquid crystal display (four) Figure (b) is a diagram for solving the patent force value compared with _ & ls ^ first / original value of the solution. In the backlight green map 17 (a It is a diagram of the back and the formula in the liquid crystal display device, and FIG. 17(b) is used to compare the value of the patent document 1 for comparison with the solution of the solution (10). The map of the way. The backlight of the solution of the moon source, and Fig. 18 (4) show the backlight value in the liquid crystal display device.

Fig. 18(b) is a diagram for comparing the manner in which the patent document is calculated. [Description of main component symbols] 11 chroma reduction sections 12, 12a, 12b Output signal generation sections 13, 13a, 13b Liquid crystal panel control section 14 RGBW liquid crystal panel (liquid crystal panel) 15, 15a, 15b Backlight control sections 16, 16a, 16b white backlight (active backlight) 21 month light source upper limit calculation unit 22 signal conversion unit 31 W penetration amount calculation unit 32 RGB penetration amount calculation unit 33 backlight value calculation unit 34 transmittance calculation unit 41 input signal Division part 51 Personal computer body 127713.doc -52· 200844976 52 CPU 53 Memory 54 Output interface 55 Output device 56 Memory media 127713.doc - 53 -

Claims (1)

200844976 X. Patent application scope: 1. A transmissive liquid crystal display device comprising: a liquid helium S panel, which divides 1 pixel into red (R), green (G), blue (B), and white (W) 4 sub-pixels; f-color active backlight, which can control the brightness of the light; the heart is reduced.像素 'In the pixel data included in the input signal as the wheeled image, the pixel data yoke with higher brightness and chroma is processed by % degree reduction, and the second input rgb signal is converted into the first 2 input RGB signal; an output signal generating unit that generates a transmittance signal of each of R, G, B, and W of each pixel of the liquid crystal panel from the second input RGB signal, and calculates the active backlight The backlight value of the liquid crystal panel control unit drives and controls the liquid crystal panel based on the tooth permeability signal generated by the output signal generating unit; and the backlight control unit based on the backlight calculated by the output signal generating unit The light source brightness of the backlight is controlled by the source value. 2. The transmissive liquid crystal display device of claim 1, wherein the chroma reduction unit is in the pixel data for performing the chroma reduction processing, and the luminance and hue are not changed until before and after the chroma reduction processing. The chroma is reduced. The transmissive liquid crystal display device of claim 1, wherein the chroma reduction unit changes the degree of chroma reduction processing. 4. The transmissive liquid crystal display device of claim 3, wherein the display is performed when the transmittance of each of the RGB sub-pixels is set to x% and the transmittance of each of the 127 sub-pixels of 127713.doc 200844976 is set to 0%. When the luminance PI and the ratio P2/P1 of the display luminance P2 when the transmittance of each of the RGB sub-pixels is 0% and the transmittance of each of the W sub-pixels is X% is the white luminance ratio WR, the above The chroma reduction unit sets a range of change in the degree of chroma reduction processing in accordance with the white luminance ratio WR. 5. The transmissive liquid crystal display device of claim 1, wherein the chroma reduction unit extracts the pixel data included in the first input RGB ® signal as the input image by the following sequence (A) , pixel data with higher brightness and chroma; and for the extracted pixel data, the chroma reduction is performed by the following sequence (B); (A) the upper limit of the backlight is calculated by the formula of MAXw=MAXxB lRatio The value MAXw, and the pixel data satisfying • MAXw<maxRGB-minRGB is extracted as the pixel data with higher luminance and chroma, wherein • WR : white luminance ratio (the transmittance of each of the RGB sub-pixels is set to X% and When the display luminance P1 of each of the W sub-pixels is set to 0%, and the respective transmittances of the RGB sub-pixels are set to 〇% and the respective transmittances of the W sub-pixels are set to X% Display brightness P2 ratio P2/P1) MAX ··Backlight value upper limit value BIRatio when chroma processing is not performed ··Backlight value setting rate (l/(l+WR)SBlRati〇S1.0) 127713 .doc 200844976 maxRGB=max(Ri,Gi,Bi) minRGB=min(Ri,Gi,Bi) Ri,Gi,Bi(i=l,2,··· , Np) · · RGB value of the pixel of interest in the first input RGB signal i Np : number of pixels of the input image max (A,: 8, one): eight, six, the maximum value of min (A, B '...): A, B, ... minimum value (B) For the extracted pixel data, the pixel data after the chroma reduction process is obtained by the following formula: Rsi=axRi+(la)x Yi Gsi=axGi+ (la) xYi Bsi=axBi+(la)xYi where Np): 2 Rsi, Gsi, Bsi in the 2nd input RGB signal (the RGB value of the pixel of interest after the chroma reduction process is called 1, 2, ..., NP): The brightness of the pixel of interest is a = MAXw / (maxRGB - minRGB). 6. The transmissive liquid crystal display device of claim 5, wherein the output ## generating means includes a ····························· w sub-image RGB penetration amount calculation unit, which uses the sub-images to calculate the RGB field J-pixels I (Rtsi, Gtsi, Btsi) backlight value calculation unit, 1 burial, The backlight value 127713.doc 200844976 (Wbs) is calculated in the following order (C); and the transmittance calculation mechanism calculates the transmittance of each RGB W sub-pixel by the order of (D) below (rsi, gsi , bsi, wsi); (A) Calculate the W penetration (Wtsi) by Wtsi=min(maxRGBs/(l + l/WR), minRGBs), where maxRGBs=max(Rsi, Gsi 5 Bsi) minRGBs =min(Rsi 5 Gsi 5 Bsi) (B) Calculate the RGB penetration (Rtsi, Gtsi, Btsi) by Rtsi=Rsi-Wtsi Gtsi=Gsi-Wtsi Btsi=Bsi-Wtsi, (C) by Wbs =max(Rtsl, Gtsl, Btsl, Wtsl/WR, RtsNp, GtsNp, BtsNp, WtsNp/WR) Calculate the backlight value (Wbs), (D) by rsi=Rtsi/Wbs gsi=Gtsi/Wbs bsi= Btsi/Wbs wsi=Wtsi/Wbs/WR 127713. Doc 200844976 RGBW penetration rate (rsi, gsi, bsi, wsi) where Wbs = 〇, rsi = gSi = bsi = wsi = 〇. The transmissive liquid crystal display device of claim 1, wherein The liquid crystal panel comprises a plurality of active backlights; and for each region corresponding to each active backlight, the lens transmittance control and the backlight source value control of the backlight are controlled. 8. A recording medium characterized in that: a control program is recorded, which causes the computer to perform the processing of the request function portion as described above. Each of the items 5 is a recording medium characterized in that the processing of the control program function portion is recorded. It causes the computer to proceed as described in item 6 above. I277l3.doc