TW200813924A - A liquid crystal display and backlight module thereof and display method - Google Patents

Abstract

A liquid crystal display and a backlight module thereof and a display method. The backlight module at least includes a light-emitting element, a polarization assembly, and a switched retarder. The light-emitting element is used for providing a light source. The light source passes through the polarization assembly to form a first polarized light. The switched retarder has several switched areas. Each switched area is corresponding a switched direction. The first polarized light passes through the switched areas to form several second polarized lights. The second polarized lights are corresponding the switched directions respectively. Wherein the switched directions are not the same.

Description

200813924 W3141PA, IX, invention description: [Technical field] The present invention relates to a liquid crystal display device, a backlight module thereof and a display method thereof, and more particularly to a modulation component matched with a polarizing element, so that the light source enters A liquid crystal display device exhibiting different brightness and darkness when the panel is displayed, a backlight module thereof, and a display method. [Prior Art] Xin display technology is changing with each passing day, bringing people unlimited visual enjoyment. In particular, the liquid crystal display device has the advantages of small size, light weight, high enamel quality and long life, and the liquid crystal display device is generally applied to various electronic products, such as a digital television, a computer screen, a notebook computer, a mobile phone or a camera. Wait. Referring to Fig. 1, there is shown the schematic of a conventional liquid crystal display device 900. The liquid crystal display device 900 includes a backlight module 910, a display panel 920, a first polarizer 930, and a second polarizer 940. The backlight module _ 910 has a light emitting surface 910a, and the backlight module 910 includes a light emitting element 911. The light emitting element 911 is used to provide a light source. The display panel 920 is disposed on one side of the light emitting surface 910a. The first polarizing plate 930 is disposed on one side of the display panel 920 adjacent to the backlight module 910, and the second polarizing plate 940 is disposed on a side away from the backlight module 910. Referring to Fig. 2, a schematic view of the display panel 920 of Fig. 1 is shown. The display panel package 920 includes a color filter substrate 921, a thin film transistor substrate 922 and a liquid crystal layer 923, a color filter substrate 921 and a thin film 6

200813924rW3141PA, the film transistor substrate 922 sandwiches the liquid crystal layer 923 up and down. The display panel 920 has a plurality of pixels. The liquid crystal molecules in each element control the rotation angle of the liquid crystal molecules 921a on the thin film transistor substrate 922 and the color filter substrate 921. When the light source of the light-emitting element 911 passes through the first polarizing plate 930, a polarized light L91 is formed. When the polarized light L91 traverses the display panel 920, the polarized light L91 transmits the rotated liquid crystal molecules and the color filter substrate 921 to form a plurality of primary color lights L92 having different polarization directions. Then, when the primary polarization light L92 of the different polarization directions φ passes through the second polarizing plate 940, each primary color light L92 is blocked by the second polarizing plate 940 to a different extent, and the primary color light L92 having a different degree of depth is formed. The primary color light with different depths of each element is L92, and finally forms a face. However, in the conventional liquid crystal display device 900, there is still a phenomenon of dark light leakage. In the dark state, the light source is still blocked by the display panel 920 and the second polarizing plate 940, and a slight light source is still exposed, which is light gray. The contrast between the dark state and the bright state is not much different, _ and the contrast of the lower face. Therefore, how to provide a solution and solve the above problems is one of the important directions of current research and development. SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a liquid crystal display device, a backlight module thereof and a display method thereof, which utilize a modulation component and a design of a polarizing element to cause different light and darkness when the light source enters the display panel. , making the liquid crystal display device, its backlight module and display method have "contrast 7

200813924 W3i4iPA, "High", "Effective use of light source", "Increase color depth", "Easy control", "Low cost of materials", "Problems to avoid bright lines" and "Improve dark light leakage". According to one aspect of the present invention, a backlight module is proposed. The backlight module includes at least one light emitting component, a polarizing component, and a modulation component. The illuminating element is used to provide a light source. After the light source passes through the polarizing element, a first polarized light is formed. The modulation element has a plurality of modulation regions. Each of the modulation regions corresponds to a modulation direction, and after the first polarized light passes through the modulation region, a plurality of second polarization 0 lights are formed. The second polarized lights respectively correspond to the modulation directions. Among them, these modulation directions are not completely the same. According to another object of the present invention, a liquid crystal display device is proposed. The liquid crystal display device includes a backlight module, a display panel, a first polarizing plate and a second polarizing plate. The backlight module has a light emitting surface. The backlight module includes a light emitting element, a polarizing element and a modulation element. A light emitting element is used to provide a light source. After the light source passes through the polarizing element, a first polarized light is formed. The modulation element has several modulation regions. Each modulation area corresponds to a modulation direction. After the Φ-polarized light passes through the modulation region, a plurality of second polarized lights are formed and emitted from the light-emitting surface. The second polarized lights respectively correspond to the modulation directions, wherein the modulation directions are not completely the same. The display panel is disposed on one side of the light exit surface. The first polarizing plate is disposed on a side of the display panel adjacent to the backlight module. The first polarizing plate has a first polarizing axis. The second polarizing plate is disposed on a side of the display panel away from the backlight module. Wherein, the modulation directions are not exactly the same as the first polarization axis. According to still another object of the present invention, a display method is proposed for improving 8

200813924 TW3141PA . Screen contrast of liquid crystal display devices. The liquid crystal display device comprises a backlight module and a display panel. The backlight module has a plurality of modulation regions, and each of the modulation regions and regions corresponds to a modulation direction. The display method includes at least the following steps: (a) controlling the direction of each modulation so that the direction of modulation is not completely the same. (b) illuminating one of the light-emitting elements of the backlight module to provide a light source into the display panel, wherein when the light source enters the display panel, the brightness of the light-modulating area corresponding to the light source is not completely the same. The above described objects, features, and advantages of the present invention will become more apparent from the following detailed description. 3 is a schematic view showing a liquid crystal display device 100 in accordance with a first embodiment of the present invention. The liquid crystal display device 100 includes a backlight module 110, a display panel 120, a first polarizing plate 130, and a second polarizing plate 140. The backlight module 110 has a light emitting surface 110a. The backlight module 110 includes a light emitting element 1 , a polarizing element 112 , and a modulation element 116 . The light emitting element 111 is used to provide a light source. After the light source passes through the polarizing element 112, a first polarized light L11 is formed. Modulation element 116 has a plurality of modulation regions 116a. Each of the modulation regions 116a corresponds to a modulation direction (: 1 or (: 2). After the first polarization L11 passes through the modulation regions 116a, a plurality of second polarized lights L12 are formed and are emitted by the light exit surface 110a. The second polarized light L12 respectively corresponds to the modulation directions C1 or C2, wherein the modulation bands 9

200813924rW3141PA - The same is true for the C1 or C2 system. In this embodiment, the modulation direction includes a first shovel direction U and a second modulation direction eg. The first modulation direction is substantially perpendicular to the second modulation direction C2. The display panel 120 is disposed on one side of the light exit surface n〇a. The first polarizing plate 130 is disposed on one side of the display panel 12 adjacent to the backlight module 11 . The first polarizing plate 130 has a first polarizing axis cl3〇. The second polarizing plate 140 is disposed on a side of the display panel 120 away from the backlight module HQ. The second polarizing plate 140 has a second polarizing axis cl4〇. Among them, the modulation method is not exactly the same as the first polarization axis C130 to the C1 or C2 system. In the present embodiment, the first modulation direction C1 is perpendicular to the first polarization axis cl3 〇, and the second modulation double direction C2 is parallel to the first polarization axis C130. By the difference in the modulation direction Q or C2, the contrast of the liquid crystal display device 1 can be effectively improved. As for the detailed structure of the polarizing element 112 and the modulation element 116, the following description will be described in detail below with reference to Figs. 3 and 4, respectively. As shown in Fig. 3, in the present embodiment, the polarizing element 112 includes a linear polarizing plate 114. After the light source passes through the line polarizing plate 114, the first polarized light L11 is formed. Further, the line polarizer 114 further has a brightness enhancement film 113. The brightness enhancement film 113 reflects the light source that cannot pass through the line polarizing plate 114, and changes its polarization state to pass through the line polarizing plate 114 again. Therefore, the linear polarizing plate 114 can be prevented from reducing the intensity of the light source. Please refer to FIG. 4, which shows a sound diagram of the modulation element 116 of FIG. The modulation element 116 includes a first substrate 117, a second substrate, and a modulation liquid crystal layer 119. The first substrate 117 has a common electrode film 117a. The second substrate 118 has a plurality of data lines U8a and a plurality of sweeping lines

200813924TW3141PA t 118b and a plurality of transistors 118c, each of which corresponds to one of the modulation regions 116a. The modulation liquid crystal layer 9 is disposed between the first substrate 117 and the second substrate 118. The common electrode film 117a and the transistor 118c are used to control the liquid crystal turning of the modulation liquid crystal layer Π9 such that each modulation region 116a corresponds to the modulation direction C1 or C2. As shown in Fig. 4, after the first polarized light L11 passes through the modulation element 116, a plurality of second polarized lights 1^12 are formed. The second polarized lights L12 correspond to the first modulation direction C1 or the second modulation direction C2, respectively. _ As shown in Fig. 3, wherein the modulation element 116 corresponds to a 1/2 wavelength phase difference. When the light source passes through the polarizing element 112, the first polarized light L11 of the line-biased state is formed. Then, after the first polarized light L11 of the linearly polarized state passes through the 1/2 wavelength phase difference modulation element 116, the second polarized light L12 of the line-polarized state is still formed. As shown in FIG. 3, since the second polarized light L12 corresponding to the first modulation direction C1 is perpendicular to the first polarization axis C130, the second polarized light L12 corresponding to the first modulation direction C1 cannot pass through the first polarized light. Board 130. The second polarized light L12 corresponding to the second modulation direction C2 is parallel to the first polarization axis C130, so that the second polarized light L12 corresponding to the second modulation direction C2 can smoothly pass through the first polarizing plate 130. . Referring to Figure 5, a schematic view of the display panel 120 of Figure 3 is shown. The display panel 120 includes a color filter substrate 121, a thin film transistor substrate 122, and a 'display liquid crystal layer 123. The color filter substrate 121 and the thin film transistor substrate 122 sandwich the liquid crystal layer 123. The display panel 120 has a plurality of pixels 120a, and each of the modulation regions 116a corresponds to 11

200813924 W3141PA - Three of the elements 120a' are, for example, a red sub-pixel R, a green sub-pixel G, and a blue sub-vitamin B. As shown in FIG. 3, since the first polarized light L12 corresponding to the first modulation direction [I cannot pass through the first polarizing plate 130, and the second polarized light L12 corresponding to the second modulation direction C2 can smoothly cross the first - Polarized plates are added. = Therefore, the brightness of the light source received by each of the pixels 120a of the display panel 120 is not exactly the same. In addition, after the 溥 film transistor substrate 12 2 drives the liquid crystal layer of the liquid crystal layer 12 to rotate, the second polarized light L12 corresponding to the second modulation direction C2 can pass through the second polarizing plate 140. The amount of the second polarized light L12 corresponding to the second modulation direction C2 passing through the second polarizing plate 140 is determined by the degree of rotation of the liquid crystal molecules of the liquid crystal layer. Therefore, when a certain pixel is intended to exhibit a darker picture brightness, the brightness of the light source entering the element 120a can be made lower by the control of the modulation direction C1 or C2. The brightness of the face. When a certain pixel 120a wants to display a brighter picture brightness, the brightness of the light source entering the element 120a can be made higher by the φ control of the modulation direction C1 or C2, and the brightness of the brighter surface is presented. . Therefore, the brightness contrast of the entire face is quite high. Please refer to FIG. 6 and FIG. 3 at the same time. FIG. 6 is a flow chart showing the main steps of the display method according to the present invention. The display method of the present invention includes at least the following steps: First, in step S1 of Fig. 6, each of the modulation directions C1 or C2 is controlled such that the modulation directions C1 or C2 are not completely identical. Then, in step S2 of FIG. 6, the light source of the backlight module 110 is lit, 12

200813924rW3141PA ^ and enters the display panel 120. When the light source enters the display panel 12A, the brightness corresponding to the modulation areas 116a is not completely the same. Referring to Figure 7, there is shown a flow chart of the calculation steps for controlling the modulation direction C1 or C2 in the first embodiment of the present invention. Step S1 of Fig. 6 further includes the following steps. First, in step S11, one of the corresponding gray areas of the modulation area 116a is obtained. Next, in step S12, it is judged whether or not the face gray value is smaller than a predetermined gray value (for example, 32). If yes, the process proceeds to step S13, and if not, the process proceeds to step S14. In step S13, if the face ash φ degree value is smaller than the preset gradation value, it means that the picture to be presented is dark. The modulation element 116 controls the liquid crystal steering of the modulation liquid crystal layer 119 such that the modulation direction C1 of the modulation region 116a is perpendicular to the first polarization axis C130. At this time, the second polarized light L12 cannot pass through the first polarizing plate 130, but exhibits a dark state. In step S14, if the gradation value of the facet is greater than or equal to the preset gradation value, it indicates that the face to be presented is brighter. The modulation element 116 controls the liquid crystal steering of the modulation liquid crystal layer 119 such that the modulation direction C2 of the modulation region 116 is parallel to the first polarization axis C130. At this time, the second polarized light L12 can smoothly pass through the first polarizing plate 130 to present a bright state. Referring to Figure 8, there is shown a block diagram of a liquid crystal display device 100 in accordance with a first embodiment of the present invention. The liquid crystal display device 1 further includes a display processing unit 150, a display timing controller 160, and a backlight timing controller Π0. In the present embodiment, the signal processing program is located in the display processing unit 150. The display timing controller 16 is electrically connected to the display processing unit 150 and the display panel 120 for receiving a facet data and controlling the display panel 120 according to the daily tracking sequence. Among them, display timing control

The device 160 controls the thin film transistor substrate 122 (shown in FIG. 5) of the display panel 120 through a display data line control unit 181 and a display scan line control unit 182. The backlight timing controller 170 is electrically connected to the display processing unit 150 and the backlight module 110 for receiving the same data and dynamically controlling the backlight module 110 according to the same time series in synchronization with the display timing controller 160. The backlight timing controller 170 controls the second substrate 118 of the modulation component 160 (shown in FIG. 4) through a backlight data line control unit 191 and a backlight scanning line control unit 192. As described above, the liquid crystal display device 100 of the present embodiment, the backlight module 110 thereof, and the display method can solve the conventional problems by the above design. Second Embodiment The liquid crystal display device 200 of the present embodiment is different from the liquid crystal display device 100 of the first embodiment in the polarizing element 212 of the backlight module 210, and the rest are not described in detail. Referring to FIG. 9, a schematic diagram of the liquid crystal display device 200 of the second embodiment is shown. In the present embodiment, the first polarized light L11 is in a line-biased state, and the variable-modulating element 116 corresponds to a 1/2-wavelength phase difference. The polarizing element 212 includes a circular polarizing plate 215 and a line modulation plate 214. The circular polarizing plate 215 has a brightness enhancement film 213. When the light source passes through the circular polarizing plate 215, the light source forms a first polarized light L11 of a circularly polarized state. At the same time, the brightness enhancement film 213 can reflect the light source that cannot pass through the circular polarizing plate 215, and changes its polarization state to pass through the circular polarizing plate 215 again. Therefore, the circular polarizing plate 215 can be prevented from reducing the intensity of the light source. 14

200813924rw3HiPA, then, the first polarized light ui of the circularly polarized state passes through the line modulation plate 214 to form the first polarized light lh of the line-biased state. Then, after the first polarized light L11 passes through the modulation element 116, the first polarizing plate 130, the display panel 120, and the second polarizing plate 140 in sequence, the object of the present invention can be achieved. Third Embodiment The liquid crystal display device of the first embodiment of the liquid crystal display device 300 of the present embodiment is different in that the other components of the modulation element 316 and the polarizing element 312' of the backlight module 310 are not described in detail. Referring to the drawings, a schematic diagram of a liquid crystal display device 3 (10) of a third embodiment is shown. In the present embodiment, the first polarized light L31 is in a circularly polarized state, and the modulating element 316 corresponds to a 1/4 wavelength or a 3/4 wavelength phase difference. The polarizing element 312 includes a circular polarizing plate 315. The circular polarizing plate 315 has a brightness enhancement film 313. When the light source passes through the circular polarizing plate 315, the light source forms the first polarized light L31 of the circularly polarized state 315. At the same time, the brightness enhancement film 313 can reflect the light source that cannot pass through the circular polarizing plate 315 and change its polarization state, and then cross the circular polarizing plate 315 again. Therefore, the circular polarizing plate 315 can be prevented from reducing the intensity of the light source. Next, the circularly polarized first polarized light L31 further passes through the 1/4 wavelength or 3/4 wavelength phase difference modulation element 316 to form a line-biased second polarized light L12. Then, after the second polarized light L12 sequentially passes through the first polarizing plate 13A, the display panel 120, and the second polarizing plate HQ, the object of the present invention can be achieved.

200813924W3141PA, Fourth Embodiment The liquid crystal display device of the present embodiment is different from the liquid crystal display device 100 of the first embodiment in the calculation step of controlling the modulation direction, and the rest are not described in detail. Referring to the third and third figures, FIG. 11 is a flow chart showing the operation of controlling the modulation direction according to the fourth embodiment of the present invention. First, in step S41, a picture gradation value corresponding to one of the modulation areas 116a is obtained. Next, in step S42, it is judged whether or not the pupil gradation value is smaller than a predetermined gradation value (for example, 32). If yes, go to step φ S43, otherwise go to step S44. In step S43, if the pupil grayscale value is less than the preset grayscale value, the modulation component 116 controls the liquid crystal steering of the modulation liquid crystal layer 119 such that the modulation direction of the modulation region 116a is perpendicular to the first polarization axis C130. At this time, the second polarized light L12 cannot pass through the first polarizing plate 130, but exhibits a dark state. In step 844, the modulation component 116 controls the liquid crystal steering of the modulation liquid crystal layer 119 to control the modulation direction of the modulation region 116a to rotate relative to the first polarization axis C130 [90-(昼面灰度值/255) x90 ] angle. At this time, the second polarized light L12 may partially pass through the first polarizing plate C130 to exhibit grayscale brightness. In addition, the calculation step of controlling the modulation direction of the embodiment is applicable not only to the structure of the liquid crystal display device 100 of the first embodiment, but also to the liquid crystal display device 200 of the second embodiment or the liquid crystal of the third embodiment. Display device 300. [Fifth Embodiment] The liquid crystal display device 500 of the present embodiment is different from the liquid crystal device of the first embodiment in that the signal processing procedure is not described in detail. Please refer to the liquid crystal diagram of the 12th and (=the remaining phase_present_本发(四)五实关, and the 13th figure shows the liquid crystal light according to the fifth embodiment of the present invention: the block diagram. The liquid crystal display device 500 includes - Display processing single 2:0 one display timing controller 560. In this embodiment, 3 and located in the display timing _ system crying (9) Gong Li processing program system 560. Display timing controller 560 1 Connect to the display unit to 5 〇, 赫 panel (10) and back button group = raw = connect L 昼 face data, and synchronously according to the same - time series dynamic, to display the non-panel 12G and backlight module 110. According to the liquid crystal display device disclosed in the above embodiments, the 锏^ region corresponds to three halogens. However, each modulation region may correspond to one or two or more morphemes. As long as the design of the modulation component and the biasing member is used to improve the contrast of the kneading surface, the technical scope of the invention is not disclosed. The liquid crystal display device and the backlight module and the display thereof disclosed in the above embodiments The method uses the modulation component to match the setting of the polarizing element. The source exhibits different brightness when entering the display panel, so that the display and the backlight module and the display method have the following advantages: First, "high contrast": the present invention controls each modulation direction by a modulation component, After the light source passes through the modulation component, it exhibits different brightness when entering the display panel, so that the contrast of the liquid crystal display device can be up to 100000:1. Second, "effective use of light source": the polarizing element of the invention has more Increase 17

200813924TW3141PA . Bright film makes it impossible to cross the polarizing element through all the light sources. Not only does it not detract from the brightness of the light source, it makes more efficient use of all the light sources, and concentrates the light source in the direction of polarization. Third, "increasing the color depth": In addition to the gray scale of the display panel, each element can also have the effect of color depth multiplication by the light and dark changes of the light source corresponding to each modulation area. In particular, the modulation element of the fourth embodiment can provide liquid crystal orientation of a plurality of modulated liquid crystal layers, so that the color depth of the surface of the liquid crystal display device is relatively high. ^ For example, if the display panel has a color depth of 255 steps and the modulation element has a 15th order liquid crystal turning, the liquid crystal display device will exhibit a color depth of 255*15 steps. Fourth, "easy control": The control method of the modulation element used in the present invention is the same as the control method of the display panel. It is only necessary to dynamically control the display panel and the backlight according to the same side data and the same time sequence, without the need for additional complicated circuit design, which is quite convenient. Fifth, "low material cost": The modulation element used in the present invention includes a first substrate, a second substrate, and a modulation liquid crystal layer. The structure of the modulation element is similar to that of the display panel, and the material is easy to obtain and does not require the construction of a new production line. The present invention is achieved at a low material cost to achieve the objectives of the present invention. Sixth, "the problem of avoiding bright and dark lines": In the modulation component of the present invention, there is no need to separate the bright and dark sections by the partitions between the modulation areas, and only the liquid crystal steering of the liquid crystal layer can be controlled. A light source that achieves different brightness levels. Therefore, there is no problem that the partition may cause bright and dark lines. 18 200813924tw314ipa „ Seventh, “Improve dark state light leakage”: Through the design of the present invention, in the place where the dark state is to be presented, the modulation element is matched with the first polarizing plate to block the light source from entering the display panel. This will cause no dark light to appear in the dark state. In the above, the present invention has been disclosed in the above preferred embodiments, but it is not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention is subject to the definition of the scope of the application-specific profit.

19

200813924 TW3141PA. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a conventional liquid crystal display device; FIG. 2 is a schematic view showing a display panel of FIG. 1; and FIG. 3 is a view showing a liquid crystal according to a first embodiment of the present invention. 4 is a schematic diagram of a modulation element of FIG. 3; FIG. 5 is a schematic diagram of a display panel of FIG. 3; and FIG. 6 is a flow chart showing the main steps of the display method according to the present invention; Figure 7 is a block diagram showing the calculation steps of controlling the modulation direction according to the first embodiment of the present invention; Figure 8 is a block diagram showing the liquid crystal display device according to the first embodiment of the present invention; FIG. 10 is a schematic view showing a liquid crystal display device of a third embodiment; FIG. 11 is a flow chart showing a calculation step of controlling a modulation direction φ according to a fourth embodiment of the present invention; 12 is a block diagram showing a liquid crystal display device according to a fifth embodiment of the present invention, and FIG. 13 is a block diagram showing a liquid crystal display device according to a fifth embodiment of the present invention. 20

200813924 TW3141PA . [Description of Main Components] 100, 200, 300, 500: Liquid crystal display devices 110, 210, 310: backlight module 110 a: light-emitting surface 111: light-emitting elements 112, 212, 312 · polarizing elements 113, 213 313: brightness enhancement film 114: line polarizing plate ^ 214: line modulation plate 215, 315: circular polarizing plate 116, 316: modulation element 116a: modulation area 117: first substrate 117a: common electrode film 118: Two substrates 118a: data lines φ 118b: scan lines 118c: transistors 119: modulation liquid crystal layer 120: display panel 120a: pixels 121: color filter substrate 122: thin film transistor substrate 123: display liquid crystal layer 21 200813924^ 3141PA lean 130: first polarizing plate 14 0 : second polarizing plate 150, 550: display processing unit 160, 560: display timing controller 170: backlight timing controller 181: display data line control unit 182: display scan line control unit 191: Backlight data line control unit 19 2 · Backlight scanning line control Early element 900: Liquid crystal display device 910: Backlight module 910a: Light emitting surface 911: Light emitting element 920: Display panel 921: Color filter substrate 921a: Common electrode thin _ 9 2 2 : Thin film transistor substrate 923 · Liquid crystal layer 9 3 0 : First polarizing plate 940 : Second polarizing plate C1 · First modulation direction C2 : Second modulation direction C130 : First polarization axis C140 : Second polarizing axis 22 200813924 rW3141PA . L11, L13 : First polarized light L12 : Second polarized light L 91 · Polarized light L92 : Primary color light R : Red sub-German G : Green sub-pixel B : Blue sub-genogen

twenty three

Claims (1)

200813924 TW3141PA X. Patent application scope: 1. A backlight module comprising at least: a light-emitting element for providing a light source; a polarizing element, the light source traversing the polarizing element to form a first polarized light; and a tone The variable component has a plurality of modulation regions, each of the modulation regions corresponding to a modulation direction, and the first polarized light passes through the modulation regions to form a plurality of second polarized lights, and the second polarized lights respectively Corresponding to the modulation P directions; wherein 'the modulation directions are not completely the same. 2. The backlight module of claim 1, wherein the modulation component is capable of modulating the modulation directions separately. 3. The backlight module of claim 1, wherein the modulation direction includes a first modulation direction and a second modulation direction, and the first modulation directions are perpendicular to the second Modulate the direction. 4. The backlight module of claim 1, wherein the modulating element comprises: a first substrate having a common electrode film; a second substrate having a plurality of transistors, each of the electrodes a crystal system corresponding to one of the modulation regions; and a modulation liquid crystal layer disposed between the first substrate and the second substrate, the common electrode film and the transistors for controlling the modulation liquid crystal The liquid crystal of the layer is turned so that each of the modulation regions corresponds to the modulation directions. 5. The backlight module of claim 1, wherein the 24 200813924:W3141PA u first polarized light is a linearly polarized state, and the modulated component corresponds to a 1/2 wavelength phase difference. 6. The backlight module of claim 5, wherein the polarizing element comprises: a linear polarizing plate for causing the light source to form the first polarized light in a line-polarized state. 7. The backlight module of claim 5, wherein the polarizing element comprises: a circular polarizing plate for forming the first polarized light in a circularly polarized state; and a line modulation plate And the first polarized light of the circularly polarized state is used to form the first polarized light of a linearly polarized state. The backlight module of claim 1, wherein the first polarized light is a circularly polarized state, and the modulated component corresponds to a 1/4 wavelength or a 3/4 wavelength phase difference. 9. The backlight module of claim 8, wherein the H polarizing element comprises: a circular polarizing plate for causing the light source to form the first polarized light in a circularly polarized state. 10. The backlight module of claim 1, wherein the polarizing element has a brightness enhancing film. 11. The backlight module of claim 1, wherein the backlight module is applied to a display panel, the display panel has a plurality of pixels, and each of the modulation regions corresponds to one of the paintings. Prime. The backlight module of the first aspect of the invention, wherein the backlight module corresponds to a display panel, the display panel has a plurality of pixels, and each of the modulation regions corresponds to a plurality of pixels. Some of these elements. 13. A liquid crystal display device comprising: a backlight module having a light emitting surface, the backlight module comprising: a light emitting element for providing a light source; and a polarizing element, the light source is formed after the polarizing element is formed a first polarized light; and a 0-modulation element having a plurality of modulation regions, each of the modulation regions corresponding to a modulation direction, wherein the first polarized light passes through the modulation regions to form a plurality of second polarizations The light is emitted from the light emitting surface, and the second polarized lights respectively correspond to the modulation directions, wherein the modulation directions are not completely the same; a display panel is disposed on one side of the light emitting surface; a polarizing plate is disposed on a side of the display panel adjacent to the backlight module, the first polarizing plate has a first polarization axis; and φ. a second polarizing plate is disposed on the display panel away from the backlight mode One side of the group; wherein the modulation directions are not exactly the same as the first polarization axis. 14. The liquid crystal display device of claim 13, wherein the second polarizing plate has a second polarizing axis, the second polarizing axis being substantially perpendicular to the first polarizing axis. 15. The liquid crystal display device of claim 13, wherein a part of the modulation directions are perpendicular to the first polarization axis, and a portion of the 26 200813924W3141PA _ the modulation directions are parallel to the first polarization axis. The liquid crystal display device of claim 13, wherein the modulation component is capable of modulating the modulation directions separately. The liquid crystal display device of claim 13, wherein the modulation element comprises: a first substrate having a common electrode film; a second substrate having a plurality of transistors, each of the transistors The system corresponds to one of the modulation regions; and a modulation liquid crystal layer is disposed between the first substrate and the second substrate, and the common electrode film and the transistors are used to control the modulation liquid crystal The liquid crystal of the layer is turned so that each of the modulation regions corresponds to the modulation directions. 18. The liquid crystal display device of claim 17, further comprising: a display processing unit; a display timing controller electrically connected to the display processing unit and the display panel for receiving a surface Data and dynamically controlling the display panel; and a backlight timing controller electrically connected to the display processing unit and the backlight module for receiving the surface data and synchronizing with the display timing controller The backlight module is dynamically controlled. 19. The liquid crystal display device of claim 17, further comprising: a display processing unit; and a display timing controller electrically connected to the display processing unit, 27 200813924rw 3141PA, the display panel and the It f In the domain group, the first polarized light system dynamically controls the display panel and the backlight and/or the surface of the backlight with a phase difference of 1 / 2 wavelength, and the liquid crystal display according to the 13th patent range The device of claim 5, wherein the modulating element corresponds to the liquid of claim 2, wherein the polarizing element comprises: a linear polarizing plate for causing the light source to form a linearly polarized light. The liquid crystal display of the second aspect of the invention, wherein the polarizing element comprises: & a circular polarizing plate for causing the light source to form the first polarized light of a circularly polarized state; and a line tone And a plate for causing the first polarized light of the circularly polarized state to form the first polarized light of a linearly polarized state. The liquid crystal display device of claim 13, wherein the first polarized light system is a circularly polarized state, and the modulated variable element corresponds to a 1/4 wavelength or a 3/4 wavelength phase difference. The liquid crystal display device of claim 23, wherein the polarizing element comprises: a circular polarizing plate for causing the light source to form the first polarized light in a circularly polarized state. The liquid crystal display device of claim 13, wherein the polarizing element has a brightness enhancement film. The liquid crystal display device of claim 13, wherein the display panel has a plurality of halogens, each of the modulation regions corresponding to one of the halogens. 27. The liquid crystal display device of claim 13, wherein the display panel has a plurality of halogens, each of the modulation regions corresponding to a portion of the pixels. A display method for improving the contrast of a liquid crystal display device, the liquid crystal display device comprising a backlight module and a display panel, the 0 backlight module having a plurality of modulation regions, each of the modulation regions corresponding to a The display method includes: (a) controlling each of the modulation directions such that the modulation directions are not completely the same; (b) lighting a light-emitting element of the backlight module to provide a light source And entering the display panel, wherein when the light source enters the display panel, the brightness of the light source corresponding to the modulation regions is not completely the same. 29. The display method of claim 28, wherein the liquid crystal display device further comprises a first polarizing plate and a second polarizing plate, respectively disposed on the display panel adjacent to and away from the backlight module. On the side, the first polarizing plate has a first polarization axis, and the step (a) comprises: controlling the modulation directions to be not identical to the first polarization axis. 30. The display method of claim 28, wherein the step (a) comprises: the modulation directions of the control portion being perpendicular to the first polarization axis; and the modulation directions of the control portion being parallel to The first polarization axis. The display method of claim 28, wherein the step (a) further comprises: obtaining a gray value corresponding to one of the modulation regions; determining the surface Whether the gray value is smaller than a preset gray value; if the pupil gray value is smaller than the preset gray value, controlling the modulation direction of the modulation region is perpendicular to the first polarization axis; and Ai, The modulation direction of the modulation region is controlled to be parallel to the optical axis. , μ - partial 32 · The display method according to claim 28, the step (a) further includes: ', obtaining one of the modulation regions corresponding to one of the modulation regions; Whether the gray value of the facet is less than a preset gray value; if the gray value of the face is smaller than the preset gray value, controlling the modulation direction of the modulation region is perpendicular to the first polarization axis; Otherwise, the modulation direction of the modulation region is controlled to be rotated to an angle relative to the first polarization axis [90 - (the pupil gray value / 255) x 90]. A Φ 33. The display method according to claim 28, wherein the liquid crystal steering of the modulating liquid crystal layer is controlled, the modulating element comprises a modulating liquid crystal layer, and the step U) comprises / and is identical. In order to make the modulation direction not 34, the step (a) as described in claim 33 of the patent application includes: No method, in which the liquid crystal of the layer is turned. The method of realizing the method, wherein the modulating liquid crystal is dynamically controlled according to a time series is 35. The display 30 according to the scope of the patent application is entitled to be in the form of a plurality of elements, each of which has a plurality of elements, wherein each of the modulation regions corresponds to One of these pixels. 36. The display method of claim 28, wherein the display panel has a plurality of pixels, each of the modulation regions corresponding to a portion of the pixels. 31