WO2007110998A1 - Liquid crystal display and television receiver - Google Patents

Abstract

A liquid crystal display (100) includes a first panel and a second panel having a polarized absorption function and arranged in a relation of crossed nicols with a polarizing plate (B) provided on the back side of the first panel. Display based on a video signal is performed on each of the first panel and the second panel. This provides the liquid crystal display (100) capable of improving the contrast with a cheap configuration.

Description

 Specification

 Liquid crystal display device and television receiver

 Technical field

 The present invention relates to a liquid crystal display device having a function for improving contrast and a television receiver including the same.

 Background art

 [0002] There are various techniques disclosed in the following Patent Documents 1 to 7 as techniques for improving the contrast of a liquid crystal display device.

[0003] Patent Document 1 discloses a technique for improving the contrast ratio by appropriately adjusting the content and specific surface area of the yellow pigment in the pigment component of the color filter. As a result, it is possible to improve the problem that the contrast ratio of the liquid crystal display device is lowered due to the scattering and depolarization of the polarized light molecules of the color filter. According to the technique disclosed in Patent Document 1, the contrast ratio of the liquid crystal display device is improved from 280 to 420.

[0004] Patent Document 2 discloses a technique for improving the contrast ratio by increasing the transmittance and the degree of polarization of a polarizing plate. According to the technique disclosed in Patent Document 2, the contrast ratio of the liquid crystal display device is improved from 200 to 250.

[0005] Further, Patent Document 3 and Patent Document 4 disclose a technique for improving contrast in a guest-host method using the light absorptivity of a dichroic dye.

[0006] Patent Document 3 describes a method for improving contrast by a structure in which a guest-host liquid crystal cell has two layers and a 1Z4 wavelength plate is sandwiched between the two layers of cells. In Patent Document 3,

It is disclosed that no polarizing plate is used.

[0007] Patent Document 4 discloses a liquid crystal display element of a type in which a dichroic dye is mixed with a liquid crystal used in a dispersion type liquid crystal system. Patent Document 4 describes that the contrast ratio is 101.

[0008] However, the techniques disclosed in Patent Document 3 and Patent Document 4 have a lower contrast than other methods, and in order to further improve the contrast, the light absorption of the dichroic dye is improved. Strength that requires increasing the dye content and increasing the thickness of the guest-host liquid crystal cell In any case, new problems such as technical problems, reduced reliability and poor response characteristics arise.

 [0009] Further, Patent Document 5 and Patent Document 6 disclose a contrast improvement method using an optical compensation method, in which a liquid crystal display panel and a liquid crystal panel for optical compensation are provided between a pair of polarizing plates.

 [0010] In Patent Document 5, in the STN method, the contrast ratio of the display cell, the liquid crystal cell for differential optical compensation, and the retardation is improved from 14 to 35! /.

[0011] In Patent Document 6, a liquid crystal cell for optical compensation is installed to compensate for the wavelength dependence of a TN liquid crystal display cell during black display, and the contrast ratio is improved from 8 to 100. ing.

 [0012] However, with the techniques disclosed in each of the above patent documents, a force that improves the contrast ratio by a factor of 2 to 10 is obtained. The absolute value of the contrast ratio is 35 to 420. It is a degree.

 [0013] As a technique for improving the contrast, for example, Patent Document 7 discloses a composite liquid crystal display in which two liquid crystal panels are overlapped so that each polarizing plate forms a cross-coll. An apparatus is disclosed. Patent Document 7 describes that a contrast ratio of one panel is 100, and the contrast ratio can be expanded to about 3 to 4 digits by superimposing two panels.

 Patent Document 1: Japanese Published Patent Publication “JP 2001-188120 (Publication Date: July 10, 2001)”

 Patent Document 2: Japanese Published Patent Publication “Japanese Patent Laid-Open No. 2002-90536 (Publication Date: March 27, 2002)”

 Patent Document 3: Japanese Patent Publication “JP-A 63-25629 (Publication Date: February 3, 1988)”

 Patent Document 4: Japanese Patent Publication “Japanese Patent Laid-Open No. 5-2194 (Publication Date: January 8, 1993)”

Patent Document 5: Japanese Published Patent Publication “Japanese Patent Laid-Open No. 64-49021” (Publication Date: February 1989) Patent Document 6: Japanese Patent Publication “Japanese Patent Laid-Open No. 2-23 (Publication Date: January 5, 1990) J

 Patent Document 7: Japanese Patent Publication “JP-A-5-88197 (Publication Date: April 9, 1993)”

 Disclosure of the invention

 By the way, in the composite liquid crystal display panel device disclosed in Patent Document 7, two liquid crystal panels are overlapped so that each polarizing plate forms a cross-col with each other! / Therefore, three polarizing plates are required. In general, a polarizing plate is expensive. Therefore, as the number of polarizing plates increases, the cost of the liquid crystal display panel device increases accordingly.

 The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device capable of improving contrast with an inexpensive configuration and a television receiver including the same. It is to provide.

In order to solve the above problems, the liquid crystal display device according to the present invention is a liquid crystal display in which two or more liquid crystal panels are stacked and a polarization absorbing layer is provided in a cross-col relationship with the liquid crystal panel sandwiched therebetween. In the apparatus, a polarization absorption panel having a polarization absorption function that has a crossed Nicol relationship with the polarization absorption layer is provided on the polarization absorption layer on the back side of the liquid crystal panel. The liquid crystal panel and the polarization absorption panel are It is characterized in that the display is performed based on the above.

[0017] According to the above configuration, the polarization absorbing layer on the back side of the liquid crystal panel is provided with a polarization absorbing panel having a polarization absorbing function that has a crossed Nicol relationship with the polarization absorbing layer.

Two polarization absorbing layers and one polarization absorbing panel are in a cross-col relationship.

[0018] Thus, by providing the polarization absorbing layer and the polarization absorbing panel provided on the liquid crystal panel, the liquid crystal display device having the above configuration includes three polarization absorbing layers. In this case, since the adjacent polarization absorbing layers are in a cross-col relationship with each other, if the liquid crystal panel and the polarization absorbing panel each perform display based on the video signal, for example, in the front direction, the polarization absorbing layer The leakage light in the direction of the transmission axis can be cut by the absorption axis of the next polarization absorbing layer. In the diagonal direction, adjacent Even if the Nicol angle, which is the crossing angle of the polarization axes of the polarization absorbing layer, collapses, no increase in the amount of light due to light leakage is observed. In other words, black does not easily float against the expansion of the -col angle at an oblique viewing angle.

[0019] From the above, it is possible to improve the shutter performance both in the front direction and in the oblique direction by forming the polarization absorbing layer in a three-layer configuration and arranging them in a cross-cored manner. Thereby, the contrast can be improved.

 [0020] In the liquid crystal display device having the above-described configuration, although the polarization absorption layer has three layers, one polarization absorption layer is a polarization absorption panel that displays based on a video signal. The number of polarizing plates used as the polarizing absorption layer is two. Therefore, the number of polarizing plates can be reduced as in the case where two liquid crystal panels are overlapped as in the composite liquid crystal display panel device disclosed in Patent Document 7.

 [0021] If the number of polarizing plates increases, foreign matter may be trapped between the polarizing plate and the liquid crystal panel during the manufacturing process, resulting in deterioration of display quality in the completed liquid crystal display device. However, if the number of polarizing plates is reduced from three to two as described above, the possibility of the above problems being reduced.

 Therefore, in the liquid crystal display device of the present application, since only two expensive polarizing plates are required, it can be configured at a lower cost than when three polarizing plates are used as in Patent Document 7.

 Therefore, it is possible to provide a liquid crystal display device capable of improving contrast with an inexpensive configuration.

 [0024] The polarization absorbing panel may be a guest-host mode liquid crystal panel.

[0025] The polarization absorbing layer used in the guest-host mode type liquid crystal panel is preferably a polarization absorbing layer disposed between adjacent liquid crystal panels.

[0026] In this case, the polarization absorbing layer force used in the guest-host mode type liquid crystal panel is a polarization absorbing layer disposed between adjacent liquid crystal panels, so that the polarization absorbing layer can be reduced by one layer. . This makes it possible to improve the contrast with a simple configuration.

[0027] At least one of the liquid crystal panel and the polarization absorbing panel may be provided with a light diffusing layer having light diffusibility.

[0028] According to the above configuration, at least one of the liquid crystal panel and the polarization absorption panel has light diffusibility. By providing the light diffusion layer having, the light transmitted through the light diffusion layer can be spatially blurred. As a result, for example, it is possible to suppress the strength of asynchronous interference between fine structures (bus lines, black matrix, alignment control protrusions, etc.) having the same period of adjacent panels. As a result, it is possible to suppress the occurrence of moiré due to structural interference, and therefore it is possible to prevent the display quality from being deteriorated due to the occurrence of moiré.

 [0029] At least one of the substrates adjacent to each other in the superimposed liquid crystal panel may be formed so that the thickness of the substrates adjacent to each other is thinner than the thickness of the substrate on the side.

 [0030] According to the above configuration, the thickness force of at least one substrate on the side adjacent to each other of the stacked liquid crystal panels is not adjacent to each other and is thinner than the thickness of the side substrate. Thus, light transmission to adjacent dots (or pixels), that is, color mixing due to parallax can be suppressed. As a result, it is possible to reduce the occurrence of moire caused by the transmission of light to adjacent pixels. That is, the occurrence of moire in an oblique direction can be reduced.

 [0031] In addition, since the substrate is formed thin, the entire liquid crystal display device can be reduced in weight, and the substrate on the side not adjacent to each other is formed thick, so that the mechanical strength is increased. Can be maintained.

 [0032] The polarization absorbing panel may have an active matrix substrate, and at least a black matrix may be formed on a counter substrate facing the active matrix substrate.

[0033] Thereby, leakage current due to light irradiation can be reduced with respect to switching elements such as TFT elements formed on the active matrix substrate.

[0034] It is preferable that the counter substrate further includes a light-transmitting resin layer formed in the opening of the black matrix.

[0035] Thereby, since the edge portion of the black matrix on the counter substrate is flattened by the light-transmitting resin layer, the alignment disorder at the edge portion of the black matrix can be reduced. It is possible to reduce the deterioration of display quality.

[0036] When forming the light-transmitting resin layer, for example, a mask used for forming a color filter can be used.

[0037] It is preferable that the light-transmitting resin layer is formed so as to cover the black matrix and the opening of the black matrix. [0038] Thereby, since the counter substrate can be planarized, it is possible to further reduce the deterioration of display quality caused by the alignment disorder.

 [0039] In this case, the light-transmitting resin layer is formed so as to cover the black matrix and the opening portion of the black matrix, and therefore pattern wing is not necessarily required. As a result, exposure / development steps using a mask can be omitted when forming a light-transmitting resin layer.

[0040] In the liquid crystal panel, picture elements composed of a plurality of color dots are arranged in a matrix, and in the polarization absorption panel, dots having an integer multiple of the picture elements of the liquid crystal panel are arranged in a matrix. Arranged.

 [0041] In this case, the polarization-absorbing panel has dots that are an integral multiple of the pixels of the liquid crystal panel arranged in a matrix, so that the number of gate drivers can be reduced by using the source driver on the liquid crystal panel side. It can be greatly reduced. Thereby, it is possible to reduce the cost by reducing the number of parts.

 [0042] Of the liquid crystal panel and the polarization absorbing panel, only the liquid crystal panel should be provided with a color filter.

 [0043] In this case, since the polarization absorption panel is provided with a color filter, color mixing does not occur when light transmitted through the polarization absorption panel is transmitted through the liquid crystal panel. As a result, it is possible to suppress the occurrence of moiré due to color mixing, so that the display quality of a color display image can be improved.

 [0044] In addition, since the color filter is not provided in the polarization absorption panel, the manufacturing process of the color filter in the entire liquid crystal display device can be completed only once, so that the manufacturing cost can be reduced.

 [0045] A liquid crystal display device of the present invention is used as a display device in a television receiver including a tuner unit that receives a television broadcast and a display device that displays the television broadcast received by the tuner unit. Can be used.

 Brief Description of Drawings

 FIG. 1 is a schematic sectional view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 (a) is a diagram for explaining the principle of the guest-host mode and showing a white display state when no voltage is applied. [2 (b)] Guest This is a diagram for explaining the principle of the host mode, and shows the state of black display when a voltage is applied.

 FIG. 3 (a) is a diagram showing a relationship between a dichroic dye and a polarizing plate transmission axis, and is a diagram showing a white display state when no voltage is applied.

[3] (b)] is a diagram showing the relationship between the dichroic dye and the transmission axis of the polarizing plate, and is a diagram showing a black display state when a voltage is applied.

[4] FIG. 4 is a diagram showing a connection relationship between the driver of the liquid crystal display device shown in FIG.

 FIG. 5 is a block diagram of a display controller which is a drive circuit for driving the liquid crystal display device shown in FIG.

 6 is a schematic configuration diagram of a knocklight included in the liquid crystal display device shown in FIG.

FIG. 7 is a schematic cross-sectional view of a single liquid crystal display device.

 8 is a diagram showing the positional relationship between the polarizing plate and the panel in the liquid crystal display device shown in FIG.

[9 (a)] is a diagram for explaining the principle of contrast improvement.

[9 (b)] is a diagram for explaining the principle of contrast improvement.

[9 (c)] is a diagram for explaining the principle of contrast improvement.

[10 (a)] is a diagram for explaining the principle of contrast improvement.

[10 (b)] is a diagram for explaining the principle of contrast improvement.

[10 (c)] is a diagram for explaining the principle of contrast improvement.

[10 (d)] is a diagram for explaining the principle of contrast improvement.

[11 (a)] is a diagram for explaining the principle of contrast improvement.

[11 (b)] is a diagram for explaining the principle of contrast improvement.

[11 (c)] is a diagram for explaining the principle of contrast improvement.

[12 (a)] is a diagram for explaining the principle of contrast improvement.

[12 (b)] is a diagram for explaining the principle of contrast improvement.

[13 (a)] is a diagram for explaining the principle of contrast improvement.

[13 (b)] is a diagram for explaining the principle of contrast improvement. FIG. 13 (c) is a diagram for explaining the principle of contrast improvement.

FIG. 14 (a) is a diagram illustrating the principle of contrast improvement.

FIG. 14 (b) is a diagram for explaining the principle of contrast improvement.

FIG. 15 (a) is a diagram illustrating the principle of contrast improvement.

FIG. 15 (b) is a diagram for explaining the principle of contrast improvement.

 FIG. 16 is a diagram showing a schematic configuration of a liquid crystal display device according to another embodiment of the present invention.

FIG. 17, showing an embodiment of the present invention, is a diagram showing an example in which a light diffusion layer is disposed in front of the polarizing plate of the first panel.

 FIG. 18, showing an embodiment of the present invention, is a diagram showing an example in which a light diffusion layer is arranged in front of a second panel.

 FIG. 19 is a schematic cross-sectional view of a configuration in which moiré is suppressed in a two-panel liquid crystal display device.

 FIG. 20, showing an embodiment of the present invention, is a schematic sectional view of a liquid crystal display device.

FIG. 21 is a diagram showing an arrangement relationship between a polarizing plate and a panel in the liquid crystal display device shown in FIG.

 FIG. 22, showing an embodiment of the present invention, is a schematic sectional view of a liquid crystal display device.

 FIG. 23 is a schematic sectional view of a liquid crystal display device according to an embodiment of the present invention.

 FIG. 24 is a schematic sectional view of a liquid crystal display device for explaining countermeasures for moire.

 FIG. 25 shows an embodiment of the present invention and is a schematic sectional view of a liquid crystal display device.

 FIG. 26 is a plan view of a pixel of the liquid crystal display device shown in FIG. 25.

 FIG. 27 is a plan view showing another example of the pixel of the liquid crystal display device shown in FIG. 25.

 FIG. 28 is a schematic block diagram of a television receiver including the liquid crystal display device of the present invention.

 FIG. 29 is a block diagram showing a relationship between a tuner unit and a liquid crystal display device in the television receiver shown in FIG.

 FIG. 30 is an exploded perspective view of the television receiver shown in FIG. 28.

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 An embodiment of the present invention will be described as follows.

 [0048] Before describing a liquid crystal display device that works according to the present embodiment, a configuration of a general liquid crystal display device will be described.

 As shown in FIG. 7, a general liquid crystal display device is configured by attaching polarizing plates A and B to a liquid crystal panel including a color filter and a driving substrate. Here, an MVA (Multidom Ain Vertical Alignment) type liquid crystal display device will be described.

 As shown in FIG. 8, the polarization axes of the polarizing plates A and B are perpendicular to each other, and when the threshold voltage is applied to the pixel electrode 8, the direction in which the liquid crystal is tilted is aligned with the polarizing plates A and B. The polarization axis and azimuth angle of 45 degrees are set. At this time, since the polarization axis rotates when the incident polarized light passing through the polarizing plate A passes through the liquid crystal layer of the liquid crystal panel, light is emitted from the polarizing plate B. When only a voltage equal to or lower than the threshold voltage is applied to the pixel electrode, the liquid crystal is aligned perpendicular to the substrate and the deflection angle of the incident polarized light does not change, so that black display is obtained. The MVA method achieves a high viewing angle by dividing the direction in which the liquid crystal tilts when voltage is applied into four (Multidomain).

 Here, the vertical alignment means that the liquid crystal molecular axis (“axial orientation”) is about 8 with respect to the surface of the vertical alignment film.

A state of orientation at an angle of 5 ° or more.

However, in the case of the two-polarizing plate configuration, there is a limit to the improvement in contrast. Therefore, the inventors of the present application show that the shutter performance is improved in both the front and the diagonal directions by adopting three polarizing plates for each of the two liquid crystal display panels (each installed in a cross-coll). I found it.

 [0053] The principle of contrast improvement will be described below.

[0054] The inventors of the present application, specifically,

 (1) Front direction

 Cross-col transmission axis direction force leakage light was generated due to depolarization in the panel (scattering of CF, etc.). By using the above three polarizing plates, transmission through the second polarizing plate It was found that the leakage light can be cut by matching the absorption axis of the third polarizing plate with respect to the axial leakage light.

[0055] (2) About diagonal direction It was found that the change in the amount of leaked light was insensitive to the collapse of the polarizing plate Nicol angle φ, that is, black did not easily float with respect to the spread of the −Col angle φ at an oblique viewing angle.

 From the above, the inventors of the present application have found that the contrast is greatly improved in the liquid crystal display device. In the following, the principles of contrast improvement are shown in Figs. 9 (a) to 9 (c), 10 (a) to 10 (d), 11 (a) to 11 (c), and 12 (a). Figure 12 (b) ゝ Figure 13 (a) to Figure 13 (c), 014 (a), Figure 14 (b), 015 (a), Figure 15 (b) and Table 1 explain. Here, a two-polarizing plate configuration will be described as a configuration (1), and a three-polarizing plate configuration will be described as a configuration (2). The improvement in contrast in the oblique direction is essentially caused by the configuration of the polarizing plate, so here it is described as a model using only the polarizing plate without using a liquid crystal panel.

 [0057] Fig. 9 (a) shows an example in which there is one liquid crystal display panel in the configuration (1), and two polarizing plates 101a '101b are arranged in a cross-coll. FIG. 9 (b) is a diagram illustrating an example in which three polarizing plates 101a ′ 101b ′ 101c are arranged in a cross-cored manner in the configuration (2). In other words, in the configuration (2), since it is assumed that there are two liquid crystal display panels, there are two pairs of polarizing plates arranged in a cross-col. FIG. 9 (c) is a diagram showing an example in which the polarizing plates 101a and 101b facing each other are arranged in a cross-col and the polarizing plates having the same polarization direction are superimposed on the outer sides of the respective polarizing plates. In FIG. 9 (c), a pair of polarizing plates in a force cross-col relationship showing the configuration of four polarizing plates is assumed to sandwich one liquid crystal display panel. It becomes.

[0058] The transmittance when the liquid crystal display panel displays black is modeled as the transmittance when the polarizing plate without the liquid crystal panel is arranged in a cross-cor arrangement, that is, the cross transmittance, and is referred to as black display. The transmittance when the display panel displays white is modeled as the black transmittance when the polarizing plate without the liquid crystal panel is arranged in parallel-col, that is, parallel transmittance. Example forces showing the relationship between the wavelength and transmittance of the transmission spectrum when the frontal force is seen on the plate and the relationship between the wavelength and transmittance of the transmission spectrum when the polarizing plate is seen obliquely Fig. 10 (a) to Fig. 10 ( It is a graph shown in d). The modeled transmittance corresponds to an ideal value of transmittance for white display and black display in a method in which a polarizing plate is arranged in a crossed Nicol manner and a liquid crystal panel is held. [0059] Fig. 10 (a) is a graph when the relationship between the wavelength of the transmission spectrum and the cross transmittance when the polarizing plate is viewed from the front is compared between the configuration (1) and the configuration (2). is there. From this graph, it can be seen that the transmittance characteristics in the front of the black display tend to be similar to configurations (1) and (2).

 [0060] FIG. 10 (b) is a graph when the relationship between the wavelength of the transmission spectrum and the parallel transmittance when the polarizing plate is viewed from the front is compared between the configuration (1) and the configuration (2). . From this graph, it can be seen that the transmittance characteristics in the front of the white display tend to be similar to configurations (1) and (2).

 [0061] Figure 10 (c) shows the relationship between the wavelength of the transmission spectrum and the cross transmittance when the polarizing plate is tilted (azimuth angle 45 °-polar angle 60 °). It is a graph when comparing with the configuration (2). From this graph, the transmittance characteristics in the diagonal direction of black display show that the transmittance is almost 0 in the most wavelength range in the configuration (2), and a little light transmission in the most wavelength range in the configuration (1). It can be seen that In other words, it can be seen that light leakage occurs at an oblique viewing angle when black is displayed (a worsening of black tightening) in the two-polarizing plate configuration, and conversely, an oblique viewing angle is displayed when black is displayed in the three-polarizing plate configuration. It can be seen that light leakage (deterioration of black tightening) is suppressed.

 [0062] Figure 10 (d) shows the relationship between the wavelength of the transmission spectrum and the parallel transmittance when the polarizing plate is tilted (azimuth angle 45 °-polar angle 60 °). It is a graph when comparing with the configuration (2). From this graph power, it can be seen that the transmittance characteristics of the white display in the oblique direction tend to be similar between the configuration (1) and the configuration (2).

 [0063] From the above, at the time of white display, as shown in FIG. 10 (b) and FIG. 10 (d), the difference due to the number of polarizing plates, that is, the number of -colcross pairs of polarizing plates is almost in front. It can be seen that the transmittance characteristics are almost the same regardless of whether it is diagonal or oblique.

 However, at the time of black display, as shown in FIG. 10 (c), in the case of the configuration (1) in which the cross-coll pair is 1, the black tightness occurs at an oblique viewing angle, and the cross -It can be seen that in the configuration (2) in which the coll pair is 2, the black tightening at the oblique viewing angle is suppressed.

[0065] For example, when the wavelength of the transmission spectrum is 550 nm, the relationship between the transmittance when looking at the front and oblique (azimuth angle 45 °-polar angle 60 °) force is as shown in Table 1 below. [0066] [Table 1]

550nm

Here, in Table 1, “parallel” indicates parallel transmittance, and indicates transmittance when white is displayed. Further, the cross indicates a cross transmittance, and indicates a transmittance during black display. Therefore, normal / cross indicates contrast.

[0068] From Table 1, the front contrast in configuration (2) is approximately twice that in configuration (1), and the diagonal contrast in configuration (2) is approximately 22 times that in configuration (1). Thus, it can be seen that the diagonal contrast is greatly improved.

[0069] The viewing angle characteristics during white display and black display will be described below with reference to FIGS. 11 (a) to 11 (c). Here, the case where the azimuth angle with respect to the polarizing plate is 45 ° and the wavelength of the transmission spectrum is 550 nm will be described.

FIG. 11 (a) is a graph showing the relationship between the polar angle and the transmittance during white display. This graph force

In the configuration (2), the overall transmittance is lower than that in the configuration (1). In this case, the viewing angle characteristics (parallel viewing angle characteristics) are the same as the configurations (2) and (1 ) Is a similar trend.

 FIG. 11 (b) is a graph showing the relationship between polar angle and transmittance during black display. It can be seen that in the case of configuration (2), this graph power suppresses transmittance at an oblique viewing angle (around polar angle ± 80 °). Conversely, in the case of the configuration (1), it can be seen that the transmittance at an oblique viewing angle is increased. In other words, the configuration (1) is more prominent in black tightening at an oblique viewing angle than the configuration (2).

 FIG. 11 (c) is a graph showing the relationship between polar angle and contrast. From this graph, the configuration

It can be seen that the contrast in (2) is much better than in the case of configuration (1)! Note that the flatness around 0 degrees in configuration 2 in Fig. 11 (c) is due to the small black transmittance. This is because the number of digits is lost and the calculation cannot be performed.

 [0073] Next, the change in the amount of leakage light becomes insensitive to the collapse of the polarizing plate Nicol angle φ, that is, the black tightening is less likely to occur with respect to the spread of the −Col angle φ at an oblique viewing angle. This will be explained below with reference to Figs. 12 (a) and 12 (b). Here, as shown in FIG. 12 (a), the polarizing plate-coll angle φ means an angle in a state where the polarization axes of the polarizing plates facing each other are in a twisted relationship. Figure 12 (a) is a perspective view of a polarizing plate with a crossed Nicol arrangement, and the Nicol angle φ changes by 90 ° (corresponding to the collapse of the -Col angle).

 [0074] FIG. 12 (b) is a graph showing the relationship between the Nicol angle φ and the cross transmittance. Calculate using the ideal polarizer (parallel-col transmittance 50%, cross-col transmittance 0%). From this graph, it can be seen that the degree of change in the transmittance with respect to the change in the Nicol angle φ is smaller in the configuration (2) than in the configuration (1) during black display. That is, it can be seen that the three-polarizing plate configuration is less susceptible to the change in the -col angle Φ than the two-polarizing plate configuration.

 Next, the thickness dependence of the polarizing plate will be described below with reference to FIGS. 13 (a) to 13 (c). Here, as shown in Fig. 9 (c), the thickness of the polarizing plate is adjusted by superposing polarizing plates with the same polarization axis one by one on a pair of crossed Nicols polarizing plates (3 ). In Fig. 9 (c), an example is shown in which polarizing plates 101a '101b having the same polarization direction are superimposed on each of a pair of cross-cold polarizing plates 101a and 10 lb. Show. In this case, since the configuration has two polarizing plates in addition to the two polarizing plates arranged in a pair of cross-cols, the cross-to-one and two are used. Similarly, if the number of polarizing plates to be superimposed increases, the cross-to-one ratio is 3, 4,. In the graphs shown in Fig. 13 (a) to Fig. 13 (c), each value is measured at an azimuth angle of 45 ° and a polar angle of 60 °.

 FIG. 13 (a) is a graph showing the relationship between the polarizing plate thickness and the transmittance (cross transmittance) of a pair of cross-cold polarizing plates during black display. For comparison, this graph shows the transmittance in the case of having two pairs of cross-cold polarizing plates.

FIG. 13 (b) is a graph showing the relationship between the thickness of the polarizing plates arranged in a pair of cross-cols and the transmittance (parallel transmittance) during white display. This graph shows the comparison For example, the transmittance is shown with two pairs of cross-col arranged polarizers.

From the graph shown in FIG. 13 (a), it can be seen that if the polarizing plates are overlapped, the transmittance during black display can be reduced. From the graph shown in FIG. 13 (b), the polarizing plates are overlapped. Together, it can be seen that the transmittance during white display is reduced. In other words, in order to suppress the deterioration of black tightening at the time of black display, the transmittance at the time of white display is lowered only by overlapping the polarizing plates.

 Further, a graph showing the relationship between the thickness of the polarizing plates arranged in a pair of cross-cols and the contrast is as shown in FIG. 13 (c). For comparison, this graph shows the contrast in the case of having two pairs of crossed Nicol polarizing plates.

 As described above, from the graphs shown in FIGS. 13 (a) to 13 (c), if the configuration of the polarizing plates arranged in two pairs of cross-cols is used, the black tightening effect during black display is reduced. It can be seen that the transmittance can be suppressed and the decrease in transmittance during white display can be prevented. In addition, since the two pairs of cross-cold polarizing plates are composed of a total of three polarizing plates, it is understood that the thickness of the entire liquid crystal display device can be increased and the contrast can be greatly improved.

 [0081] Fig. 14 (a) and Fig. 14 (b) specifically show the viewing angle characteristics of the cross-col transmittance. FIG. 14 (a) is a graph showing the crossed-coll viewing angle characteristics of the configuration (1), that is, a pair of cross-col pair polarizing plates. FIG. 14 (b) is a diagram showing the configuration (2). FIG. 6 is a diagram showing the cross-col viewing angle characteristics of a case where three crossed Nicols two pairs of polarizing plates are used.

 [0082] From the diagrams shown in FIGS. 14 (a) and 14 (b), in the cross-col two-pair configuration, there is almost no deterioration in black tightening (corresponding to an increase in transmittance during black display). You can see (especially 45 °, 135 °, 225 °, 315 ° directions).

 [0083] Further, FIGS. 15 (a) and 15 (b) specifically show the contrast viewing angle characteristics (parallel Z cross luminance). FIG. 15 (a) is a diagram showing the contrast viewing angle characteristics of the configuration (1), that is, the configuration of two cross-coll pair polarizers, and FIG. In other words, it is a diagram showing the contrast viewing angle characteristics of the three cross-col pair polarizing plate configuration.

[0084] From the diagrams shown in FIGS. 15 (a) and 15 (b), the cross-col two-pair configuration is a cross-col pair configuration. It can be seen that the contrast is improved.

 By the way, in the case of the liquid crystal display device using the three polarizing plates (first panel + second panel) as described above, since three expensive polarizing plates are used, the liquid crystal display device The price of will rise.

 Accordingly, a liquid crystal display device capable of improving contrast with an inexpensive configuration will be described below with reference to FIGS.

 FIG. 1 is a diagram showing a schematic cross section of a liquid crystal display device 100 according to the present embodiment.

 [0088] As shown in Fig. 1, the liquid crystal display device 100 includes a transmissive liquid crystal display panel having a polarization absorbing function on the light irradiation side (backlight 53 side) of the first panel serving as the liquid crystal display panel power. It is composed of two overlapping panels.

 [0089] The first panel includes, from the image display side, a polarizing plate A, a transparent substrate 10, a counter substrate provided with a counter electrode 23 made of a transparent electrode, and a light irradiation side, a polarizing plate B, a transparent substrate. 10. A liquid crystal display panel in which a liquid crystal layer of 26 TN liquid crystals is interposed between an active matrix substrate on which a pixel electrode 8 such as a transparent electrode is disposed.

 [0090] The second panel is used in common with the polarizing plate B of the first panel, and from the polarizing plate B side, a transparent substrate 10 and a counter electrode 23 such as a transparent electrode cover are disposed. A guest-host in which a host liquid crystal 51, a dichroic dye 52, and a liquid crystal layer are interposed between the counter substrate and the drive substrate on which the transparent substrate 10 and the pixel electrode 8 are disposed from the light irradiation side. It is a mode liquid crystal panel.

 In the liquid crystal display device 100 having the above configuration, the polarizing plate A and the polarizing plate B provided in the first panel are in a cross-col relationship, and the second panel and the polarizing plate B are in a cross- The second panel functions as a polarization absorbing layer so as to be in a relationship with Koru.

 Accordingly, the liquid crystal display device 100 transmits the light from the knock light 53 through the polarization absorbing layer in the relationship of two pairs of crossed nicols. Thereby, the contrast can be improved. However, since there are two polarizing plates, the construction is inexpensive.

[0093] If the number of polarizing plates increases, foreign matter may be trapped between the polarizing plate and the liquid crystal panel during the manufacturing process, leading to deterioration of display quality in the completed liquid crystal display device. However, if the number of polarizing plates is reduced from three to two as described above, the possibility of the above problems being reduced. Here, the operation principle when functioning as a polarization absorbing layer in the guest-host mode liquid crystal panel will be described below with reference to FIGS. 2 (a) (b) and 3 (a) (b). .

 FIG. 2 (a) is a diagram showing the state of the host liquid crystal 51 and the dichroic dye 52 in the second panel shown in FIG. 1 when displaying white (when the switch 54 is off and no voltage is applied). 2 (b) is a diagram showing the state of the host liquid crystal 51 and the dichroic dye 52 in the second panel shown in FIG. 1 when black is displayed (when the switch 54 is turned on). It is.

 [0096] Fig. 3 (a) is a diagram showing the relationship between the dichroic dye 52 and the polarization transmission axis during white display in the second panel shown in Fig. 1, and Fig. 3 (b) In the second panel shown in FIG. 1, the relationship between the dichroic dye 52 and the polarization transmission axis during black display is shown.

 In general, in a guest-host mode liquid crystal panel, a dichroic dye is dissolved in a host liquid crystal, and the orientation state of the dichroic dye is controlled together with host liquid crystal molecules by the action of an electric field. Dichroic dyes have anisotropy in light absorption, and the light absorption level changes with the orientation state. Utilizing this, the guest-host mode liquid crystal panel controls transmitted light, that is, polarization absorption.

 In the guest-host mode liquid crystal panel described here, an example in which negative nematic liquid crystal that is vertically aligned when no voltage is applied is used as the host liquid crystal 51 and transmitted light control is performed in combination with the polarizing plate B will be described. FIG. 2 (a) shows a state in which the host liquid crystal 51 is vertically aligned with respect to the substrate with no voltage applied. At this time, the dichroic dye 52 is vertically aligned according to the alignment state of the host liquid crystal 51. As a result, as shown in FIG. 3 (a), the absorption coefficient of the dichroic dye 52 is minimized with respect to the incident light from the backlight, and the incident light enters the polarizing plate B while maintaining the polarization state of the incident light. As a result, transmitted light according to the polarizing plate absorption axis is obtained.

Next, as shown in FIG. 2 (b), when a voltage is applied between the transparent electrodes (between the counter electrode 23 and the pixel electrode 8), the host liquid crystal 51 shifts to a horizontal alignment state according to the electric field. Accordingly, the orientation state of the dichroic dye 52 also shifts. At this time, if the orientation direction of the host liquid crystal 51 is set in a direction orthogonal to the polarizing plate absorption axis in consideration of the orientation treatment such as rubbing and the electrode design, as shown in FIG. The incident light from the light first absorbed the polarization component in the molecular axis direction of the dichroic dye 52, and the transmitted polarization component coincided with the polarizing plate absorption axis. Absorbed.

 [0100] As described above, in the guest-host mode liquid crystal panel, the transmitted light is controlled by the light absorption action of the dichroic dye 52 by the voltage control. Here, it can be seen that the guest-host mode liquid crystal panel in which the orientation state of the dichroic dye 52 is set in advance functions as a polarizing plate. In other words, the optical setting in Fig. 3 (b) is a setting in which two polarizing plates are arranged in a cross-col arrangement.

[0101] As the host liquid crystal 51, in addition to the nematic liquid crystal, there is a liquid crystal using a cholesteric liquid crystal. There are also modes that use polarizing plates and modes that do not use polarizing plates by devising the orientation of the host liquid crystal.

 [0102] For black and white display, black dichroic dye 52 is used, and color display can also be performed in combination with a color filter. The dichroic dye 52 is required to have a high dichroic ratio and a high extinction coefficient. If there is no dye that satisfies these two conditions in a wide visible light region, a plurality of single-color dyes are used. The

 [0103] The liquid crystal display device 100 having the above configuration includes a display controller necessary for displaying an image on the liquid crystal display device 100.

 As shown in FIG. 4, the display controller has first and second panel drive circuits (1) and (2) for driving the first panel and the second panel with predetermined signals, respectively. Furthermore, the first and second panel drive circuits (1) and (2) have a signal distribution circuit section for distributing video source signals.

 Therefore, the display controller sends a signal to each panel so that an appropriate image can be displayed on the liquid crystal display device 100.

[0106] The display controller is a device for sending an appropriate electric signal to a given video signal power panel, and includes a driver, a circuit board, a panel drive circuit, and the like.

The first panel drive circuit (1) is connected to a terminal (1) provided on the circuit board (1) of the first panel via a driver (TCP) (1). In other words, a dry (TCP) (1) is connected to the first panel, connected by the circuit board (1), and connected to the panel drive circuit (1).

Note that the second panel drive circuit (2) in the second panel is also connected to the first panel. Description thereof is omitted here.

 From the above, in the liquid crystal display device 100 having the above-described configuration, the pixels of the first panel are driven based on the display signal and viewed from the pixels of the first panel and the vertical direction of the panel. Corresponding second panel pixels whose positions match are driven in correspondence with the first panel. If the part composed of polarizing plate A, first panel and polarizing plate B (component 1) is in the transmissive state, the part composed of polarizing plate B, second panel and polarizing plate C (component) 2) is also transmissive, and when component 1 is non-transmissive, component 2 is also driven to be non-transmissive.

 [0110] The same image signal may be input to the first and second panels, or different signals linked to each other may be input to the first and second panels! /, .

[0111] Here, a specific example of a driving method in the display controller of the liquid crystal display device 100 having the above-described configuration will be described with reference to FIG. Here, the case of input 8bit (256 gradations) and liquid crystal driver 8bit will be described.

[0112] In the panel drive circuit (1) of the display controller, the input signal (video source)

Drive signal processing such as 0 conversion, overshoot, etc., and output 8-bit grayscale data to the source driver (source drive means) of the first panel.

On the other hand, the panel drive circuit (2) performs signal processing such as γ conversion and overshoot, and outputs 8-bit gradation data to the source driver (source drive means) of the second panel. The first panel, the second panel, and the resulting output image are 8 bits.

Corresponds to the input signal on a one-to-one basis and is faithful to the input image.

[0114] Since the liquid crystal display device 100 having the above configuration has a lower transmittance than the conventional panel (one liquid crystal panel configuration) due to the display principle, the ability to provide a large amount of light is required for the knocklight 53. . An example of a lighting device that satisfies these conditions is shown in FIG.

In the liquid crystal display device 100 according to the present invention, a hot cathode lamp is used this time in order to obtain the same luminance as the conventional one. Hot cathode lamps are characterized by being able to output approximately six times the amount of light than cold cathode lamps used in general specifications.

[0116] Taking a 37-inch diagonal WXGA as an example of a standard liquid crystal display device, 18 lamps with an outer diameter of 15 mm are placed on a housing made of aluminum. In this housing Lamp power In order to efficiently use the light emitted in the back direction, a white reflective sheet using foamed resin is placed. A driving power source for the lamp is disposed on the rear surface of the housing, and the lamp is driven by electric power supplied from a household power source.

[0117] Next, in order to turn off the lamp image in the direct type backlight in which a plurality of lamps are arranged in this nodding, a milky white resin board is required. This time, a plate member based on polycarbonate, which is 2 mm thick and absorbs warp and heat deformation, is placed in the housing on the lamp, and the optical sheet to obtain the predetermined optical effect on its upper surface, specifically this time In the bottom, a diffusion sheet, a lens sheet, a lens sheet, and a polarized light reflection sheet are arranged. This specification makes it possible to obtain a backlight brightness that is about 10 times that of the general specifications of 18 cold-cathode lamps with a diameter of 4 mm, two diffuser sheets, and a polarizing reflection sheet. As a result, the 37-inch liquid crystal display device of the present invention can obtain a luminance of about 400 cdZm ² .

 [0118] However, since the amount of heat generated by this backlight is five times that of the conventional one, fins that radiate heat to the air and fans that force the air flow are installed on the back of the back chassis.

[0119] A mechanism member of the present lighting device also serves as a main mechanism member of the entire module, and the mounted panel is disposed in the backlight, and a liquid crystal display controller including a panel drive circuit and a signal distributor, A liquid crystal module is completed by installing a power source for the light source and, in some cases, a general household power source. The mounted panel is disposed in the backlight, and a frame body that holds the panel is installed to provide the liquid crystal display device of the present invention.

 [0120] As described above, when the first panel and the second panel are overlapped, depending on the resolution of the panel, moiré caused by pixel misalignment that occurs when the two panels are overlapped. May occur. In addition, because glass is thick, the light transmitted through the color filters of the two panels may cause color mixing due to parallax and moiré.

 [0121] Hereinafter, the moire reduction when two panels are overlapped will be described.

 FIG. 16 is a schematic cross-sectional view of a liquid crystal display device 101 in which a light diffusion layer 55 is provided in the liquid crystal display device 100 shown in FIG.

The liquid crystal display device 101 shows an example in which a light diffusion layer 55 is provided between the transparent electrode 10 on the light irradiation side of the first panel and the polarizing plate B, as shown in FIG. Yes. Thus, by providing the light diffusion layer 55 in the liquid crystal display device 101, the light transmitted through the light diffusion layer 55 can be spatially blurred. As a result, for example, it is possible to suppress the strength of asynchronous interference between microstructures (bus lines, black matrix, alignment control protrusions, etc.) having the same period of adjacent panels. As a result, it is possible to suppress the occurrence of moiré due to structural interference, and thus it is possible to prevent the display quality from being deteriorated due to the occurrence of moiré.

 [0125] Specifically, a case where a light diffusion layer is arranged will be described.

 For example, as shown in FIG. 17, the light diffusing layer may be provided on the outer side of the polarizing plate A, as shown in FIG. 17, or as shown in FIG. A light diffusion layer may be provided between the polarizing plate B and the polarizing plate B.

 [0127] The light diffusion layer 55 is made of a base material such as an acrylic hardened resin layer, a TAC (triacetyl cellulose) film, or a PET (polyethylene terephthalate) film, silica beads, acid aluminum, acid Use a mixture of transparent particles such as titanium.

 [0128] As the light diffusion layer 55, a transparent layer having a rough surface may be used. In this case, the structure of the portion in contact with the air layer as shown in FIG. 17 can provide a reliable light diffusion effect while being inexpensive.

 [0129] In the light diffusion layer 55, diffusion particles having a refractive index different from that of a substrate having an average particle diameter of 370 nm or more may be dispersed and contained. In this case, the light with the highest visible sensitivity and the dominant wavelength of around 555 nm is 555 ÷ 1.5 = wavelength 37 Onm among the members with a refractive index of 1.5. Can be scattered by refraction.

 [0130] In the light diffusion layer 55, diffusion particles having a refractive index different from that of a substrate having an average particle diameter of 520 nm or more may be dispersed and contained. In this case, the light having the longest wavelength of visible light of 780 ηm is 780 + 1.5 = wavelength of 520 nm among the members having a refractive index of 1.5, and the entire visible light region is scattered by refraction. can do.

[0131] The light diffusion layer 55 may contain dispersed particles having a refractive index different from that of the base material having an average particle diameter of 3.7 m or more. In this case, by increasing the order of the average particle size by an order of magnitude larger than the visible light scattering condition, stable scattering can be realized by a refraction operation that makes the entire visible light range different depending on the wavelength. [0132] Further, the cause of moire is parallax due to the thickness of the substrate of each panel. In order to suppress the occurrence of moire due to this parallax, for example, as shown in FIG. 19, the inner substrates (2) and (3) should be formed thinner than the outer substrates (1) and (4). Can be considered. As a result, the light is blocked by the black mask (BM) of the second panel, and as a result, the angle at which normal images can be viewed is widened. Therefore, it is possible to suppress the occurrence of moire in an oblique direction due to parallax.

 [Embodiment 2]

 Another embodiment of the present invention will be described as follows. Note that members having the same functions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

 The present embodiment will be described with reference to FIGS. 20 and 21. FIG. FIG. 20 shows a schematic cross-sectional outline of the liquid crystal display device of the present embodiment based on the present invention. FIG. 21 shows the configuration of a liquid crystal display device including a polarizing plate.

 The liquid crystal display device 102 shown in FIG. 20 has a configuration in which the color filter 21 is formed only on the first panel without forming the color filter 21 on the second panel.

 [0136] In order to maintain the same color reproducibility as in the conventional example, the film thickness of the color filter 21 of the first panel is set to the same film thickness as that of the color filter 21 in the case of a conventional single panel. That's fine. This time, the film thickness of the color filter 21 of the first panel was set to 1.8 m. The second panel on the side not provided with the color filter 21 is driven based on the first panel provided with the color filter 21. For example, in the blue display pixel on the first panel, the pixel on the second panel immediately below the first blue pixel is driven based on the signal of the first blue pixel. For example, the same signal may be input.

 [0137] When the liquid crystal display device 102 having the above configuration is used, the process of forming the RGB color filter 21 of the three primary colors (red, green, and blue) can be performed once, which is advantageous in terms of cost. . In addition, since the color filter is provided only in the first panel, color mixing does not occur when the light transmitted through the second panel is transmitted through the other liquid crystal panel. As a result, it is possible to suppress the occurrence of moire caused by color mixing.

Further, another example of the present embodiment will be described with reference to FIG. FIG. 22 illustrates the present invention. It is a schematic sectional drawing of the liquid crystal display device of embodiment based.

 In the liquid crystal display device 100 shown in FIG. 20, in the second panel on the side where the color filter 21 is not provided, when the black matrix layer (hereinafter referred to as BM) 24 is formed of resin, the film thickness of the BM resin When the thickness of the BM is thick, the alignment state may be disturbed near the BM edge (reference; thick 匕 is required because the resin BM is inferior to the light shielding property of the metal BM).

 In order to solve this problem, in the liquid crystal display device 103 shown in FIG. 22, a transparent layer 27 that does not contain a color pigment may be formed at a position where the color filter 21 is formed. The material of the transparent layer 27 is not particularly limited, but a material having high transparency and no coloring is preferable.

 [0141] For example, the transparent layer 27 may be a negative acrylic photosensitive resin solution photosensitive material containing no color pigment. Then, the photomask for forming the pattern of the color filter 21 can be diverted and used when the pattern of the transparent layer 27 is formed. Alternatively, a dedicated photomask that can be used for batch exposure may be used. Alternatively, negative photosensitive resin may be used with BM as a mask, and the back surface may be exposed and developed.

 [0142] Note that in Fig. 22, the step-up difference of the part where the color filter 21 is superimposed on the BM24 is emphasized, but in the case of general acrylic photosensitive resin, In general, the film thickness of the part that rides on BM24 is much smaller than the film thickness of the part without BM24. In addition, there is a high possibility that the alignment is disturbed by the climbing step. However, in the liquid crystal display device 103 shown in FIG. 22, the alignment disorder due to the climbing step does not occur.

 When this embodiment is used, the transparent layer 27 is formed so that the cross-sectional shape in the vicinity of the resin BM24 is almost the same as that when the color filter 21 is formed. It is possible to reduce the alignment disorder generated by the die.

[0144] Still another example of the present embodiment will be described with reference to FIG. FIG. 23 is a schematic sectional view of a liquid crystal display device 104 according to an embodiment of the present invention.

[0145] The purpose is to prevent alignment disorder caused by the same thick resin BM24 as the liquid crystal display device 103 shown in FIG. Here, a flat film 28 is used.

The planarizing film 28 is used for the purpose of reducing the level difference and reducing the surface unevenness. Planarization film

28 is to apply and cure a material called flat coat or overcoat. It is formed by. Various materials are available on the market for flattening materials (overcoat materials), and highly transparent materials with high flatness have been developed. Depending on the material, there is a material that does not require the use of a photomask. By using such a material, the exposure and development processes can be simplified compared to the liquid crystal display device 103 shown in FIG. is there.

 If the flat film 28 is used for the thick resin BM24, the level difference caused by the resin BM can be reduced, and the alignment disorder generated at the edge of the resin BM can be prevented.

 [0148] In this embodiment, the size of one dot of a panel without a color filter (hereinafter referred to as a black and white panel) for one dot of a panel with a color filter (hereinafter referred to as a color panel) The size may be 3 times (n = 3) in the direction of the gate bus line and 1 time (m = l) in the direction of the source bus line.

 [0149] With the above configuration, the number of source drivers can be reduced to 1Z3, and the cost can be reduced.

 In this embodiment, as shown in FIG. 24, the panel configuration in the case of 1 × 1 pixel (RGB picture element is one picture element) is the size of one pixel of the first panel having a color filter. Without a color filter, it is 1/3 of the pixel size of the second panel!

 [Embodiment 3]

 Still another embodiment of the present invention will be described below. The present invention is not limited to the following embodiment. Note that in this embodiment, portions that overlap with the liquid crystal display devices 100 to 104 described in Embodiments 1 and 2 are omitted as much as possible, and only the portions necessary in this embodiment are described. . In addition, the same numbers are given to components common to the first panel and the second panel, and the description thereof is omitted.

 [0152] In this embodiment, two liquid crystal panels are formed by using a transparent conductive film for the signal wiring (scanning signal line, auxiliary capacitance wiring, data signal line) of the liquid crystal panel constituting the liquid crystal display device 100. Described below is how to reduce the occurrence of moiré when superposed.

 FIG. 24 shows an outline of a cross section of the liquid crystal display device 105 of the embodiment based on the present invention.

 FIG. 25 is a plan view of each pixel in the first panel and the second panel of the liquid crystal display device 105 shown in FIG. 24. The active matrix substrate has an island-like BM (black) on the counter substrate 20b side. Matrix) 24b and orientation control protrusions 22 are shown in a stacked state.

[0155] Here, each signal provided on the active matrix substrate of the first panel and the second panel. The wiring is formed of a transparent conductive film.

 [0156] The pixels of the first panel are driven based on the display signal, and the corresponding pixels of the second panel corresponding to the positions of the pixels of the first panel and the vertical direction force of the panel are the first Driven according to the panel. When the part composed of polarizing plate A, the first panel, and polarizing plate B (component 1) is in the transmissive state, the part composed of polarizing plate B, the second panel, and polarizing plate C (configuration Part 2) is also in a transmissive state, and when component 1 is in a non-transparent state, component 2 is also driven to be in a non-transparent state.

 [0157] The same image signal may be input to the first and second panels, or separate signals associated with each other may be input to the first and second panels. In addition, the pixels of each panel are configured so that their positions viewed from the vertical direction coincide with each other.

 [0158] Moreover, ITO was used for the signal lines (scanning signal lines, auxiliary capacitance lines, and data signal lines) of this embodiment, but IZO (indium oxide containing zinc), ZnO (zinc oxide), etc. A transparent conductive film may be used.

 [0159] The color filter substrate 20a of the first panel is almost the same as the manufacturing method described in the basic configuration of the liquid crystal display device 100, except that the light shielding portion (BM) is formed in an island shape. Details of the manufacturing method will be omitted.

 [0160] Therefore, in the present embodiment, the description will focus on the manufacturing method of the counter substrate 20b of the second panel.

 [0161] On the transparent substrate 10, an island-shaped black matrix (BM) 24b, a counter electrode 23, an alignment film 25, and alignment control protrusions 22 are formed.

 [0162] After applying a negative acrylic photosensitive resin solution in which carbon fine particles are dispersed by spin coating on the transparent substrate 10, drying is performed to form a black photosensitive resin layer. More specifically, as shown in FIG. 25, the BM pattern that shields the alignment abnormal region that occurs in the slits 12a, 12b, 12c, and 12d, which are the electrical connection portions in the pixel electrode slit (MVA slit), is formed as an island. In order to prevent an increase in leakage current that is photoexcited when external light enters the TFT element 3, a light shielding portion (BM) is formed in an island shape at a position facing the TFT element 3.

[0163] Further, a counter electrode 23 having a transparent electrode force such as ITO is formed by sputtering, and the counter electrode 23 is formed by sputtering. After applying a positive type phenol novolak photosensitive resin solution by spin coating

, Dry, and expose and develop using a photomask to control vertical alignment 2

Form two. Thus, the counter substrate 20b is formed.

[0164] As shown in Fig. 26, the MVA ^ U 卜 (slits 12a, 12b, 12c, 1

The black matrix 24 may be provided in an island shape only on the TFT element 3 formed by 2d).

Note that the configuration and manufacturing method of the liquid crystal panel and display device using the active matrix substrate and the color filter substrate having the above-described configurations are the same as those in the basic embodiment, and thus the description thereof is omitted here.

 [0166] In the present embodiment, both the signal wirings of the first panel and the second panel are transparent conductive films. However, if the signal wiring of at least one of the panels is a transparent conductive film, the signal is used. Interference moire between wirings can be reduced.

 [0167] BM is also preferably in the form of stripes to islands. Here, the force that both the BMs of the first panel and the second panel are island-like. If the BM of at least one panel is island-like, interference moiré between BMs can be reduced.

 [0168] As described above, at least one of the two panels is a signal wiring formed of a transparent conductive film, so that interference moire between the signal wirings can be reduced. Furthermore, it is possible to eliminate stripe BMs that preferably have an island-shaped black matrix, and as a result, it is possible to reduce interference moiré between BMs.

 [0169] Further, since the scanning signal line is formed of the transparent conductive film, the off-leak current of the TFT is increased by the knock light source. Therefore, in order to reduce the off-leakage current of the TFT portion, it is preferable to provide a light-shielding metal layer or resin layer (= BM) immediately below the TFT (backlight side) as shown in FIG.

 [Embodiment 4]

 A television receiver to which the liquid crystal display device of the present invention is applied will be described below with reference to FIGS.

 FIG. 28 shows a circuit block of a liquid crystal display device 601 for a television receiver.

[0172] As shown in FIG. 28, the liquid crystal display device 601 includes a YZC separation circuit 500, a video chroma circuit 501, an AZD converter 502, a liquid crystal controller 503, a liquid crystal non-504, a backlight drive. The configuration includes a dynamic circuit 505, a backlight 506, a microcomputer 507, and a gradation circuit 508.

 [0173] The liquid crystal panel 504 has a two-panel configuration of a first liquid crystal panel and a second liquid crystal panel, and may have any of the configurations described in the above embodiments.

 In the liquid crystal display device 601 having the above configuration, first, an input video signal of a television signal is input to the YZC separation circuit 500 and separated into a luminance signal and a color signal. The luminance and color signals are converted to R, G, and B, which are the three primary colors of light, by the video chroma circuit 501, and this analog RGB signal is converted to a digital RGB signal by the AZD converter 502. Input to controller 503.

 In the liquid crystal panel 504, the RGB signal from the liquid crystal controller 503 is input at a predetermined timing, and the RGB gradation voltages from the gradation circuit 508 are supplied to display an image. The microcomputer 507 controls the entire system including these processes.

 [0176] The video signal can be displayed based on various video signals such as a video signal based on television broadcasting, a video signal captured by a camera, and a video signal supplied via the Internet line. .

Furthermore, tuner unit 600 shown in FIG. 29 receives a television broadcast and outputs a video signal, and liquid crystal display device 601 displays an image (video) based on the video signal output from tuner unit 600. Do.

[0178] When the liquid crystal display device having the above configuration is a television receiver, for example, as shown in FIG. 30, the liquid crystal display device 601 is wrapped in a first housing 301 and a second housing 306. It is a structure that is held between.

[0179] The first casing 301 is formed with an opening 301a through which an image displayed on the liquid crystal display device 601 is transmitted.

 [0180] The second casing 306 covers the back side of the liquid crystal display device 601. An operation circuit 305 for operating the liquid crystal display device 601 is provided, and a support member is provided below. 308 is attached!

[0181] As described above, in the television receiver configured as described above, the liquid crystal according to the present invention is included in the display device. By using a crystal display device, it is possible to display an image with a very high display quality with a high contrast and color reproduction range.

 [0182] The present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. Such embodiments are also included in the technical scope of the present invention. Industrial applicability

[0183] The liquid crystal display device of the present invention can be applied to a home television receiver or the like because it can improve the contrast with an inexpensive configuration by using guest-host liquid crystal instead of the polarizing plate. .

Claims

The scope of the claims  [1] In a liquid crystal display device in which two or more liquid crystal panels are stacked and a polarization absorbing layer is provided in a crossed nicols relationship with the liquid crystal panel sandwiched between them,  The polarization absorbing layer on the back side of the liquid crystal panel is provided with a polarization absorbing panel having a polarization absorbing function having a crossed Nicol relationship with the polarization absorbing layer,  The liquid crystal display device according to claim 1, wherein each of the liquid crystal panel and the polarization absorbing panel performs display based on a video signal. 2. The liquid crystal display device according to claim 1, wherein the polarization absorbing panel is a guest-host mode liquid crystal panel. [3] The liquid crystal display according to claim 2, wherein the polarization absorbing layer used in the guest-host mode liquid crystal panel is a polarization absorbing layer disposed between adjacent liquid crystal panels. apparatus.  [4] The liquid crystal display device according to any one of claims 1 to 3, wherein a light diffusing layer having light diffusibility is provided on at least one of the liquid crystal panel and the polarization absorbing panel. .  [5] The thickness of at least one of the substrates adjacent to each other in the stacked liquid crystal panel is 5. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is formed to be thinner than the thicknesses of the substrates that are not adjacent to each other. [6] The force according to any one of [1] to [5], wherein the polarization absorbing panel has an active matrix substrate, and at least a black matrix is formed on a counter substrate facing the active matrix substrate. The liquid crystal display device according to item 1. 7. The liquid crystal display device according to claim 6, wherein the counter substrate further includes a light transmissive resin layer formed in an opening portion of the black matrix. 8. The liquid crystal display device according to claim 7, wherein the light transmissive resin layer is formed so as to cover the black matrix and an opening of the black matrix. [9] In the liquid crystal panel, picture elements composed of a plurality of color dots are arranged in a matrix, and in the polarization absorption panel, dots that are an integral multiple of the picture elements of the liquid crystal panel are in a matrix form. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is arranged. 10. The liquid crystal display device according to claim 9, wherein, of the liquid crystal panel and the polarization absorbing panel, only a liquid crystal panel is provided with a color filter! /. [11] In a television receiver including a tuner unit that receives a television broadcast and a display device that displays the television broadcast received by the tuner unit.  The display device is a liquid crystal display device in which two or more liquid crystal panels are stacked and a polarization absorbing layer is provided in a cross-col relationship with the liquid crystal panel sandwiched between them.  The polarization absorbing layer on the back side of the liquid crystal panel is provided with a polarization absorbing panel having a polarization absorbing function having a crossed Nicol relationship with the polarization absorbing layer,  The television receiver, wherein each of the liquid crystal panel and the polarization absorbing panel is a liquid crystal display device that performs display based on a video signal.