WO2007069384A1

WO2007069384A1 - Liquid crystal display and television receiver

Info

Publication number: WO2007069384A1
Application number: PCT/JP2006/319950
Authority: WO
Inventors: Yoshiki Takata
Original assignee: Sharp Kabushiki Kaisha
Priority date: 2005-12-14
Filing date: 2006-10-05
Publication date: 2007-06-21

Abstract

A liquid crystal display comprising a first liquid crystal panel and a second liquid crystal panel laid in layers wherein the first liquid crystal panel presents a display based on a first display signal and the second liquid crystal panel presents a display based on a second display signal obtained from the first display signal. A polarizing plate (A) is arranged on the surface side of the first liquid crystal panel, a polarizing plate (B) is arranged on the back side thereof, the polarizing plate (B) is arranged on the surface side of the second liquid crystal panel and a polarization reflection plate is arranged on the back side thereof. Since contrast and luminance can be enhanced, a liquid crystal display having high display quality can be achieved.

Description

Specification

Liquid crystal display device and television receiver

Technical field

The present invention relates to a liquid crystal display device with improved contrast and a television receiver including the same.

Background art

[0002] As techniques for improving the contrast of a liquid crystal display device, there are various techniques disclosed in Patent Documents 1 and 2 below.

[0003] For example, Patent Document 1 and Patent Document 2 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.

[0004] Patent Document 1 discloses a technique for improving the contrast ratio between a display cell, a liquid crystal cell for differential optical compensation, and a retardation in the STN system from 14 to 35.

[0005] In addition, Patent Document 2 improves the contrast ratio from 8 to 100 by installing a liquid crystal cell for optical compensation to compensate for the wavelength dependency of a TN liquid crystal display cell during black display. is doing.

Patent Document 1: Japanese Patent Publication “Japanese Patent Laid-Open No. 64-49021 (Publication Date: February 23, 1989)”

Patent Document 2: Japanese Patent Publication “Japanese Patent Laid-Open No. 2-23 (Publication Date: January 5, 1990) J

Disclosure of the invention

[0006] However, with the techniques disclosed in each of the above-mentioned patent documents, the contrast ratio improvement effect of slightly over 2 to 10 times is obtained, but the contrast ratio is about 35 to: LOO. Absent. In other words, the technique disclosed in each of the above cited references has a problem in that a sufficient contrast ratio improvement effect cannot be obtained in the liquid crystal display device.

[0007] The present invention has been made in view of the above problems, and an object of the present invention is to realize a liquid crystal display device with high display quality with a simple structure and a greatly improved contrast ratio. is there.

In order to solve the above problems, the liquid crystal display device according to the present invention has two or more liquid crystal panels stacked, and a polarization transmission layer is provided in a cross-col relationship with the liquid crystal panel sandwiched therebetween. When one of the adjacent liquid crystal panels is the first liquid crystal panel and the other is the second liquid crystal panel, the first liquid crystal panel displays V based on the first display signal. The liquid crystal display device in which the second liquid crystal panel displays based on the second display signal obtained from the first display signal, and at least one of the polarization transmission layers has a function of polarization reflection. It is characterized by being a polarizing reflection layer.

[0009] According to the above configuration, two or more liquid crystal panels are stacked, and the polarization transmission layer is provided in a cross-col relationship with the liquid crystal panel sandwiched therebetween. For example, in the front direction, the polarization transmission layer The leakage light in the direction of the transmission axis can force the leakage light by the transmission axis of the next polarization transmission layer. Further, in the oblique direction, even if the coll angle, which is the intersection angle of the polarization axes of the adjacent polarized light transmitting layers, collapses, no increase in the amount of light due to light leakage is observed. In other words, black is less likely to float with respect to the expansion of the -col angle at an oblique viewing angle.

[0010] From the above, when two or more liquid crystal panels are overlapped, at least three polarization transmission layers are provided. In other words, it is possible to significantly improve the shutter performance in both the front and diagonal directions by using three layers of polarized light transmission layers and arranging them in crossed Nicols. Thereby, the contrast can be greatly improved.

[0011] At least one of the polarized light transmitting layers is a polarized light reflecting layer having a polarized light reflection function, so that light transmitted through the polarized light reflecting layer can be reflected. Therefore, the liquid crystal panel can be irradiated with light efficiently. This makes it possible to increase the brightness while improving the contrast.

[0012] In addition, an illumination device for supplying display light to the first liquid crystal panel and the second liquid crystal panel is provided, and the polarization reflection layer includes the illumination device among a plurality of polarization transmission layers. It is preferred to be placed in the position closest to the position.

[0013] Thereby, the light of the illumination device power can be used most effectively, so that the brightness can be further increased.

[0014] For example, a hot cathode fluorescent lamp may be used as the light source of the illumination device. [0015] In general, a hot cathode fluorescent lamp requires a lower applied voltage than a cold cathode fluorescent lamp, and therefore there is no problem of electrical withstand voltage even if lamps that are easy to handle are arranged close to each other. In addition, the hot cathode fluorescent lamp is also suitable for its low calorific value due to its large light emission per lamp and good luminous efficiency, compared to the cold cathode fluorescent lamp. As a result, many lamps can be arranged in close proximity, and at the same time, very high-density light emission (high brightness) can be achieved with a minimum temperature rise.

[0016] Only one of the first liquid crystal panel and the second liquid crystal panel may be provided with a color filter.

[0017] Thus, only one of the first liquid crystal panel and the liquid crystal panel that performs display based on the second display signal is provided with a color filter. When light transmitted through the liquid crystal panel passes through the other liquid crystal panel, color mixing does not occur. As a result, it is possible to suppress the occurrence of moire due to color mixing.

[0018] Further, since the color filter is provided only in one of the liquid crystal panels, it is not necessary to provide the color filter in the other liquid crystal panel. As a result, when the liquid crystal display device is manufactured, the manufacturing process of the color filter is completed only once, so that the manufacturing cost can be reduced.

[0019] The liquid crystal panel on the side provided with the color filter preferably has an active matrix substrate, and at least a black matrix is preferably formed on the counter substrate facing the active matrix substrate. Better ,.

[0020] Thereby, it is possible to reduce off-leakage due to light irradiation with respect to switching elements such as TFT elements formed on the active matrix substrate.

[0021] It is preferable that the counter substrate further includes a light-transmitting resin layer formed in the opening portion of the black matrix.

[0022] Thereby, since the edge of the black matrix on the counter substrate is flattened by the light-transmitting resin layer, the alignment disorder at the edge of the black matrix can be eliminated. Deterioration of display quality can be prevented.

[0023] Further, when forming the light transmissive resin layer, it is used when forming a color filter. A mask can be used.

[0024] Preferably, the light-transmitting resin layer is formed so as to cover the black matrix and the opening of the black matrix.

[0025] Thereby, since the counter substrate can be flattened, it is possible to reliably prevent the display quality from being deteriorated due to the alignment disorder.

[0026] In this case, the light-transmitting resin layer is formed so as to cover the black matrix and the opening of the black matrix, so there is no need for pattern jung. As a result, when the light-transmitting resin layer is formed, the exposure and development process using a mask can be omitted.

[0027] One-dot magnitude force of the liquid crystal panel on the side not provided with the color filter n X m times one dot of the liquid crystal panel on the side provided with the color filter (n and m are real numbers, at least one of which is a real number

Preferably, n greater than 1 is equal to the direction along the gate bus line, and m is the direction along the source bus line.

Thus, the number of source drivers of the liquid crystal panel on the side not provided with the color filter can be reduced to lZn and the number of gate drivers on the liquid crystal panel including the color filter. Thereby, the cost of the liquid crystal display device can be significantly reduced.

[0029] Specifically, display control means for outputting a display signal to the liquid crystal panel and performing display control of the liquid crystal panel is provided, and the display control means does not include the color filter. N X m dots (1 and n are real numbers at least one greater than 1) n is the direction along the gate bus line. , M may be controlled so as to be the maximum gradation data in the direction along the source bus line) or to be the gradation data indicated by the calculation result reflecting the maximum gradation.

[0030] The liquid crystal panel on the side provided with the color filter has picture elements composed of red pixels, green pixels, and blue pixels arranged in a matrix, and includes the color filter. The panel is preferably provided with the above-described color filter, and pixels having a size that is an integral multiple of the picture element of the liquid crystal panel on the other side are arranged in a matrix.

Accordingly, the source driver of the liquid crystal panel on the side not provided with the color filter and The number of gate drivers can be significantly reduced compared to liquid crystal panels equipped with color filters.

[0032] In addition, a light diffusing layer having light diffusibility may be provided on at least one of the plurality of liquid crystal panels superimposed on each other! ,.

[0033] In this case, the light transmitted through the light diffusing layer can be spatially blurred by providing the light diffusing layer having the light diffusing property on at least one of the superimposed liquid crystal panels. As a result, for example, it is possible to suppress the strength of asynchronous interference between microstructures having the same period of adjacent panels (nosline, black matrix, alignment control protrusion, etc.). As a result, it is possible to suppress the occurrence of moire due to structural interference, and thus it is possible to prevent the display quality from being deteriorated due to the occurrence of moire.

[0034] 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.

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

3 is a plan view of the vicinity of a pixel electrode of the liquid crystal display device shown in FIG.

4 is a schematic configuration diagram of a drive system that drives the liquid crystal display device shown in FIG.

FIG. 5 is a diagram showing a connection relationship between a driver of the liquid crystal display device shown in FIG. 1 and a panel drive circuit.

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

FIG. 7 is a block diagram of a display controller that is a drive circuit for driving the liquid crystal display device shown in FIG.

FIG. 8 is a schematic cross-sectional view of a liquid crystal display device with one liquid crystal panel.

FIG. 9 is a diagram showing the positional relationship between a polarizing plate and a panel in the liquid crystal display device shown in FIG.

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

FIG. 11, showing an embodiment of the present invention, is a schematic sectional view of a liquid crystal display device.

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

FIG. 13, showing an embodiment of the present invention, is a schematic sectional view of a liquid crystal display device.

FIG. 14, showing an embodiment of the present invention, is a schematic sectional view of a liquid crystal display device.

FIG. 15 is a diagram showing pixels when performing color display of a liquid crystal display device.

FIG. 16 is a diagram showing one pixel having a size corresponding to the pixel shown in FIG.

FIG. 17 is a diagram showing a pixel obtained by enlarging the pixel shown in FIG. 16 twice.

FIG. 18 is a schematic sectional view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 19 is a plan view of pixels provided in the liquid crystal display device shown in FIG.

FIG. 20, showing an embodiment of the present invention, is a diagram showing an example in which a light diffusion layer is disposed in front of a polarizing plate of a first liquid crystal panel.

FIG. 21, 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 liquid crystal panel.

FIG. 22, showing an embodiment of the present invention, is a diagram showing an example in which a light diffusing layer is disposed between respective polarizing plates of a first liquid crystal panel and a second liquid crystal panel.

FIG. 23 shows an embodiment of the present invention, and is a diagram showing an example in which a lens sheet as a light diffusion layer is disposed between respective polarizing plates of a first liquid crystal panel and a second liquid crystal panel.

FIG. 24 is a schematic block diagram of a television receiver including the liquid crystal display device of the present invention.

25 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. 26 is an exploded perspective view of the television receiver shown in FIG. 24.

BEST MODE FOR CARRYING OUT THE INVENTION

As shown in FIG. 8, a general liquid crystal display device is configured by attaching polarizing plates A and B to a liquid crystal panel having a color filter and a driving substrate. Here, the MVA (Multidom ain Vertical Alignment) method is explained. As shown in FIG. 9, the polarizing 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 the azimuth angle of 45 degrees. 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, light is emitted from the polarizing plate B. In addition, when only a voltage 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 incident polarization does not change, resulting in black display. The MVA method achieves a high viewing angle by dividing the direction in which the liquid crystal tilts when a voltage is applied into four (Multidomain).

Here, the vertical alignment refers to a state in which the liquid crystal molecular axes (“axial orientation”) are aligned at an angle of about 85 ° or more with respect to the surface of the vertical alignment film.

However, in the case of the two-polarizing plate configuration, there is a limit to the improvement in contrast. Therefore, the inventor of the present application has a configuration in which polarizing plates are provided on both sides of the liquid crystal panel as shown in FIG. 9, and further, as shown in FIG. 2, the second liquid crystal panel and a polarizing reflector (polarizing reflective layer). By arranging the transmission axes of two polarizing plates (polarization transmission layer) and one polarization reflection plate (polarization reflection layer) in cross-coll, the contrast can be improved. I found it.

As the polarizing reflector, a dielectric optical mirror that reflects linearly polarized light as it is is used. In addition to a polarizing reflector that reflects linearly polarized light as it is, a polarizing reflector that reflects linearly polarized light converted from circularly polarized light may be used. The polarization reflector in this case has a function of converting circularly polarized light into linearly polarized light through a 4λ plate. In the following, the principle of improving contrast will be described below with reference to Figs. 10 (a) and 10 (b). Here, the configuration of the two polarizing plates A and B shown in FIG. 10 (a) is configured (1), and a polarizing reflector is further added to the polarizing plates A and B shown in FIG. 10 (b). The three-plate polarizing plate configuration will be described as the configuration (2). The improvement in the contrast in the oblique direction is essentially caused by the configuration of the polarizing plate. Therefore, here, the description is made by using only the polarizing plate as a model without using a liquid crystal panel.

[0041] FIG. 10 (a) assumes the case where there is one liquid crystal display panel in the configuration (1), and the two polarizing plates A and B are arranged so that their transmission axes are cross-cold. FIG. 10 (b) shows an example in which the transmission axes of the two polarizing plates A and B and one polarizing reflector are arranged in a cross-cored manner in the configuration (2). FIG. In other words, in configuration (2) Assumes two liquid crystal display panels, so there are two pairs of polarizing plates arranged in a cross-coll. Since the polarizing reflector has a function as a polarizing plate, for the convenience of explanation, it is used as a polarizing plate except for a case where the function of reflecting polarized light is described.

[0042] For each of the above configurations,

(1) Front direction

In the configuration (1) above, leakage light was generated from the cross-coll transmission axis direction due to depolarization in the panel (scattering of CF, etc.). It was found that the leakage light can be cut by making the transmission axis of the third polarizing plate coincide with the leakage light in the transmission axis direction of the first polarizing plate.

[0043] (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, it has been found that the contrast is greatly improved in the liquid crystal display device.

Here, the transmittance when the liquid crystal display panel performs black display is modeled as the transmittance when the liquid crystal panel is not provided and the polarizing plate in the case of the cross-col arrangement, that is, the cross transmittance, and is referred to as black display. The transmittance when the liquid crystal display panel displays white is modeled as the transmittance when the polarizing plate without the liquid crystal panel is arranged in parallel-col, that is, parallel transmittance, and is called black display. .

Here, a liquid crystal display device using the above-described principle of improving contrast will be described below with reference to FIGS.

[Embodiment 1]

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

As shown in FIG. 1, the liquid crystal display device 100 includes a first liquid crystal panel, a second liquid crystal panel, polarizing plates A and B, and a polarizing reflecting plate (polarizing reflecting layer) that are alternately bonded. It is configured. In other words, the liquid crystal display device 100 according to the present embodiment is for improving contrast on the light source side with respect to the liquid crystal display element composed of the first liquid crystal panel and the polarizing plates A and B. The second liquid crystal panel and a polarizing reflector are provided. Here, the polarizing reflector is provided on the light source side with respect to the polarizing plates A and B and on the light source side with respect to the second liquid crystal panel.

FIG. 2 is a diagram schematically showing the arrangement of the polarizing plate, the polarizing reflector, and each liquid crystal panel in the liquid crystal display device 100 shown in FIG. In FIG. 2, the polarizing plate A and the polarizing plate B, and the polarizing plate B and the polarizing reflector are configured so that their polarization axes are orthogonal to each other. That is, the polarization axes (transmission axes) of the polarizing plates A and B, the polarizing plate B, and the polarizing reflector are respectively arranged in a cross-col.

[0050] Each of the first liquid crystal panel and the second liquid crystal panel is formed by encapsulating liquid crystal between a pair of transparent substrates (color filter substrate (CF) 20 and active matrix substrate (TFT) 30). By changing the orientation of the liquid crystal, there is provided means for arbitrarily changing the state where the polarized light incident on the polarizing plate A from the light source is rotated by about 90 degrees, the state where the polarized light is not rotated, and the intermediate state.

[0051] Each of the first liquid crystal panel and the second liquid crystal panel includes a color filter, and has a function of displaying an image with a plurality of pixels. The display method with such functions is TN (Twisted Nematic) method, VA (Vertical Alignment) method, IPS (In Plain Switching) method, FFS method (Fringe Field Switching) method, or a combination of these methods. However, the VA method, which has high contrast even when used alone, is suitable.In this case, the power IPS method and FFS method, which are explained using the MVA (Multidomain Vertical Alignment) method, are also normally black methods. There is. The drive system uses active matrix drive by TFT (Thin Film Transistor). Details of the method for producing MVA are disclosed in JP-A-2001-83523.

[0052] The first and second liquid crystal panels in the liquid crystal display device 100 have the same structure. As described above, each of the first and second liquid crystal panels has the color filter substrate 20 and the active matrix substrate 30 facing each other. In addition, a columnar resin structure provided on the color filter substrate 20 or the like is used as a spacer (not shown), and the substrate spacing is kept constant. Liquid crystal is sealed between a pair of substrates (color filter substrate 20 and active matrix substrate 30), and a vertical alignment film 25 is formed on the surface of each substrate in contact with the liquid crystal. Liquid crystal A nematic liquid crystal having negative dielectric anisotropy is used.

The color filter substrate 20 is obtained by forming the color filter 21, the black matrix 24, etc. on the transparent substrate 10.

As shown in FIG. 3, the active matrix substrate 30 has a TFT element 3, a pixel electrode 8, and the like formed on a transparent substrate 10, and further includes alignment control protrusions 22 that define the alignment direction of the liquid crystal and A slit pattern 11 is provided. When a voltage higher than the threshold value is applied to the pixel electrode 8, the liquid crystal molecules are tilted in a direction perpendicular to the protrusions 22 and the slit pattern 11. In the present embodiment, the protrusions 22 and the slit pattern 11 are formed so that the liquid crystal is aligned in the direction of 45 ° azimuth with respect to the polarization axis of the polarizing plate.

[0055] As described above, in the first liquid crystal panel and the second liquid crystal panel, the red (R) green (G) blue (B) pixels of the respective color filters 21 saw the vertical force respectively. The positions are configured to match. Specifically, the R pixel of the first liquid crystal panel is the R pixel of the second liquid crystal panel, the G pixel of the first liquid crystal panel is the G pixel of the second liquid crystal panel, and the first liquid crystal panel. The B pixels are configured such that their positions viewed from the vertical direction coincide with the B pixels of the second liquid crystal panel.

FIG. 4 shows an outline of a drive system of the liquid crystal display device 100 having the above configuration.

The drive system includes a display controller necessary for displaying an image on the liquid crystal display device 100.

[0058] The display controller includes first and second liquid crystal drive units (1) and (2) for driving the first liquid crystal panel and the second liquid crystal panel with predetermined signals, respectively. Further, the first and second liquid crystal drive units (1) and (2) have signal distribution circuit units for distributing video source signals.

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

[0060] The display controller is a device for sending an appropriate electrical signal from a given video signal to the panel, and includes a driver, a circuit board, a panel drive circuit, and the like.

[0061] FIG. 5 shows the connection relationship between the first and second liquid crystal panels and the panel drive circuits. In FIG. 5, the polarizing plate and the polarizing reflector are omitted.

[0062] The first liquid crystal drive unit (1) is connected to the first liquid crystal panel via a driver (TCP) (1). It is connected to a terminal (1) provided on the road board (1). That is, the driver (TCP) (1) is connected to the first liquid crystal panel, connected by the circuit board (1), and connected to the first liquid crystal drive unit (1).

Note that the connection of the second liquid crystal drive unit (2) in the second liquid crystal panel is also the same as that in the first liquid crystal panel, and the description thereof is omitted.

Next, the operation of the liquid crystal display device 100 having the above configuration will be described.

[0065] The pixels of the first liquid crystal panel are driven based on a display signal, and the corresponding second liquid crystal panel in which the position of the pixel of the first liquid crystal panel coincides with the position viewed from the vertical direction of the panel. These pixels are driven in correspondence with the first liquid crystal panel. When the part composed of polarizing plate A, first liquid crystal panel, and polarizing plate B (component 1) is in the transmissive state, the part composed of polarizing plate B, the second liquid crystal panel, and the polarizing reflector (Component 2) is also in a transmissive state, and when component 1 is in a non-transmissive state, the component 2 is also driven in a non-transmissive state.

[0066] The same image signal may be input to the first and second liquid crystal panels, or separate signals associated with each other may be input to the first and second liquid crystal panels.

Here, a manufacturing method of the active matrix substrate 30 and the color filter substrate 20 will be described.

First, a method for manufacturing the active matrix substrate 30 will be described.

First, as shown in FIG. 3, a Ti / Al / Ti laminated film is formed on the transparent substrate 10 by sputtering in order to form a scanning signal wiring (gate wiring or gate bus line) 1 and an auxiliary capacitance wiring 2. A metal such as a film is formed, a resist pattern is formed by a photolithography method, dry etching is performed using an etching gas such as a chlorine-based gas, and the resist is peeled off. As a result, the scanning signal wiring 1 and the auxiliary capacitance wiring 2 are simultaneously formed on the transparent substrate 10.

[0070] Thereafter, a gate insulating film such as silicon nitride (SiNx), an active semiconductor layer made of amorphous silicon, or the like, an amorphous silicon doped with phosphorus or the like, and a low-resistance semiconductor layer also made of amorphous silicon or the like are formed by CVD. , Data signal wiring (source wiring or source line) 4, drain lead wiring 5, auxiliary capacitance forming electrode 6 A metal such as AlZTi is formed by sputtering, and a resist pattern is formed by photolithography. The resist is removed by dry etching using an etching gas such as a chlorine-based gas. As a result, the data signal wiring 4, the drain lead wiring 5, and the auxiliary capacitance forming electrode 6 are formed simultaneously.

The auxiliary capacitance is formed by sandwiching a gate insulating film of about 4000 A between the auxiliary capacitance wiring 2 and the auxiliary capacitance forming electrode 6.

Thereafter, the TFT element 3 is formed by dry etching the low-resistance semiconductor layer using chlorine gas or the like for source / drain separation.

[0073] Next, an interlayer insulating film 7 having a strength such as an acrylic photosensitive resin is applied by spin coating, and a contact hole for electrically contacting the drain lead wiring 5 and the pixel electrode 8

(Not shown) is formed by photolithography. The film thickness of the interlayer insulating film 7 is approximately.

Further, the pixel electrode 8 and the vertical alignment film (not shown) are formed in this order.

Note that the present embodiment is an MVA type liquid crystal display device as described above, and the slit pattern 11 is provided in the pixel electrode 8 made of ITO or the like. Specifically, a film is formed by sputtering, a resist pattern is formed by a photolithography method, and etching is performed with an etching solution such as salt and ferric iron to obtain a pixel electrode pattern as shown in FIG.

As described above, the active matrix substrate 30 is obtained.

[0077] Note that FIG. 3 [denoted by reference numerals 12a, 12b, 12c, 12d, 12e, 12fi, the pixel electrode 8] represents the formed slits. At the electrical connection part in this slit, the orientation is disturbed and an orientation abnormality occurs. However, for the slits 12a to 12d, in addition to the alignment abnormality, the time when the voltage supplied to the gate wiring is applied with the positive potential supplied to operate the TFT element 3 in the on state is usually on the order of seconds. Since the time during which the negative potential supplied to operate the TFT element 3 in the off state is normally on the order of milliseconds, the time during which the negative potential is applied is dominant. For this reason, when the slits 12a to 12d are positioned on the gate wiring, the impurity ions contained in the liquid crystal gather due to the gate minus DC application component, which may be visually recognized as display unevenness. Therefore, since the slits 12a to 12d need to be provided in a region that does not overlap with the gate wiring in a plan view, as shown in FIG. It is better to hide with Black Matrix 24.

Next, a method for manufacturing the color filter substrate 20 will be described.

[0079] The color filter substrate 20 is formed on the transparent substrate 10 with a color filter layer 21 made of three primary colors (red, green, blue) 21 and a black matrix (BM) 24, a counter electrode 23, and a vertical alignment film. 25 and a protrusion 22 for controlling the orientation.

First, a negative acrylic photosensitive resin liquid in which carbon fine particles are dispersed is applied onto the transparent substrate 10 by spin coating, followed by drying to form a black photosensitive resin layer. Subsequently, after the black photosensitive resin layer is exposed through a photomask, development is performed to form a black matrix (BM) 24. At this time, in the regions where the first colored layer (for example, red layer), the second colored layer (for example, green layer), and the third colored layer (for example, blue layer) are formed, the first colored layer opening, The BM is formed so that an opening for the second colored layer and an opening for the third colored layer (each opening corresponds to each pixel electrode) are formed. More specifically, as shown in FIG. 3, the BM pattern is formed in an island shape to shield the alignment abnormal region generated in the slits 12a to 12d of the electrically connected portions of the slits 12a to 12f formed in the pixel electrode 8. In addition, a light shielding portion (BM) is formed on the TFT element 3 in order to prevent an increase in leakage current that is photoexcited by external light entering the TFT element 3.

Next, after applying a negative acrylic photosensitive resin solution in which a pigment is dispersed by spin coating, drying is performed, and exposure and development are performed using a photomask to form a red layer.

[0082] Thereafter, the second color layer (for example, the green layer) and the third color layer (for example, the blue layer) are similarly formed, and the color filter 21 is completed.

[0083] Further, a counter electrode 23 having a transparent electrode force such as ITO is formed by sputtering, and then a positive type phenol novolac photosensitive resin solution is applied by spin coating, followed by drying and a photomask. Are used for exposure and development to form vertical alignment control protrusions 22.

As described above, the color filter substrate 20 is formed.

[0085] Further, in the present embodiment, a BM made of a force metal as shown in the case of a BM made of a resin may be used. The three primary color layers may include cyan, magenta, yellow, and other white layers as well as red, green, and blue, and may include a white layer. A method of manufacturing a liquid crystal panel (first liquid crystal panel, second liquid crystal panel) using the color filter substrate 20 and the active matrix substrate 30 manufactured as described above will be described below.

First, the vertical alignment film 25 is formed on the surfaces of the color filter substrate 20 and the active matrix substrate 30 that are in contact with the liquid crystal. Specifically, baking is performed as a degassing process before alignment film application, and then substrate cleaning and alignment film application are performed. After the alignment film is applied, the alignment film is baked. After the alignment film is applied and washed, further baking is performed as a degassing process. The vertical alignment film 25 defines the alignment direction of the liquid crystal 26.

Next, a method for sealing liquid crystal between the active matrix substrate 30 and the color filter substrate 20 will be described.

[0089] Regarding the method of sealing the liquid crystal, for example, an injection port is provided for injecting a part of the thermosetting seal resin around the substrate for liquid crystal injection, the injection port is immersed in liquid crystal in a vacuum, and then opened to the atmosphere. It may be performed by a method such as a vacuum injection method in which liquid crystal is injected and then the injection port is sealed with UV curing resin or the like. However, the vertical alignment liquid crystal panel has a drawback that the injection time is much longer than that of the horizontal alignment panel. Here, explanation is given by the liquid crystal drop bonding method.

[0090] A UV curable seal resin is applied around the active matrix substrate side, and liquid crystal is dropped onto the color filter substrate by a dropping method. The optimal amount of liquid crystal is regularly dropped on the inner part of the seal so that the desired cell gap is achieved by liquid crystal by the liquid crystal dropping method.

[0091] Further, in order to bond the color filter substrate and the active matrix substrate on which the seal drawing and liquid crystal dropping are performed as described above, the atmosphere in the bonding apparatus is reduced to lPa, and under this reduced pressure, the substrate After bonding, the seal portion is crushed by setting the atmosphere to atmospheric pressure, and the desired gap of the seal portion is obtained.

Next, the structure having the desired cell gap in the seal portion is subjected to UV irradiation with a UV curing device to temporarily cure the seal resin. In addition, beta is performed to final cure the seal resin. At this point, the liquid crystal spreads inside the seal resin and the liquid crystal is filled in the cell. The liquid crystal panel is completed by dividing the structure into liquid crystal panel units after the beta is completed. In the present embodiment, the first liquid crystal panel and the second liquid crystal panel are manufactured by the same process.

[0094] Subsequently, a mounting method of the first liquid crystal panel and the second liquid crystal panel manufactured by the above-described manufacturing method will be described.

Here, after cleaning the first liquid crystal panel and the second liquid crystal panel, as shown in FIG. 4, polarizing plates A and B are attached to the front and back surfaces of the first liquid crystal panel, respectively. In addition, a polarizing reflector is attached to the back surface of the second liquid crystal panel. Note that an optical compensation sheet or the like may be laminated on the polarizing plate as necessary.

Next, a driver (a liquid crystal driving LSI) is connected. Here, the connection of the driver using the TCP (Tape Carrier Package) method will be described.

[0097] For example, as shown in FIG. 5, after temporarily crimping an ACF (Arisotoropic Conductive Film) on the terminal portion (1) of the first liquid crystal panel, the TCP (1) on which the driver is placed is removed from the carrier tape. Punch, align with the panel terminal electrode, heat and crimp. After that, connect the circuit board (1) for connecting the drivers TCP (1) to the input terminal (1) of TCP (l) with ACF.

[0098] Next, the two panels are bonded together. Polarizing plate B has an adhesive layer on both sides. Clean the surface of the second liquid crystal panel, peel off the adhesive layer of the polarizing plate B attached to the first liquid crystal panel, align it precisely, and align the first liquid crystal panel and the second liquid crystal panel. Paste. At this time, since bubbles may remain between the panel and the adhesive layer, it is desirable to bond them under vacuum.

[0099] As another bonding method, an adhesive that cures at room temperature or below the heat resistance temperature of the panel, such as an epoxy adhesive, is applied to the periphery of the panel, and a plastic spacer is sprayed, for example, fluorine. Oil or the like may be enclosed. A liquid that is optically isotropic, has a refractive index similar to that of a glass substrate, and is as stable as liquid crystal is desirable.

[0100] In the present embodiment, as described in FIGS. 4 and 5, the terminal surface of the first liquid crystal panel and the terminal surface of the second liquid crystal panel are in the same position. However, the present invention is not limited to this. Also, there are no particular restrictions on the direction of terminals and the method of bonding to the panel. For example, mechanical fixation regardless of adhesion The fixed method may be used.

[0101] Thereafter, the liquid crystal display device 100 is obtained by integrating with an illumination device called a backlight.

[0102] Here, a specific example of a backlight suitable for the present invention will be described below. However, the present invention is not limited to the form of the lighting device described below, and can be changed as appropriate.

In the liquid crystal display device 100 of the present invention, the ability to provide a larger amount of light than a conventional panel is required for the knocklight based on the display principle. However, since the absorption of short wavelengths becomes more prominent even in the wavelength region, it is necessary to use a light source with a shorter wavelength and a light source on the backlight side. An example of a backlight that satisfies these conditions is shown in FIG.

[0104] In the liquid crystal display device 100 of the present invention, a hot cathode lamp is used as a light source in order to obtain the same luminance as the conventional one. Hot cathode lamps are characterized by being able to output about 6 times more light than cold cathode lamps used in general specifications.

In FIG. 6, a housing mainly made of metal is provided on a light source driving circuit (inverter), and a plurality of hot cathode lamps are arranged in this housing. In the upper part, optical sheets for obtaining a predetermined optical effect, specifically, a lower force diffusion sheet, a lens sheet, and a lens sheet are arranged this time.

[0106] Although not shown in the drawing, the amount of heat generated by this backlight is five times that of the conventional one, so there are fins on the back of the back chassis that promote heat dissipation to the air, and a fan that forces the air flow Is provided.

[0107] The mechanism member of the backlight serves as the main mechanism member of the entire module, and the mounted panel is arranged on the backlight, and includes a panel drive circuit and a signal distributor, a liquid crystal display controller, a light source A power supply for home use, and in some cases a general power supply for home use, are installed to complete the LCD module. The liquid crystal display device of the present invention is obtained by arranging the mounted panel on the backlight and installing a frame body that holds the panel.

[0108] In this embodiment mode, a direct illumination device using a hot cathode tube is shown. However, depending on the application, a light source that may be a projection method or an edge light method is a cold cathode tube, LED, OEL, Electron fluorescent tubes or the like may be used, or an appropriate combination of optical sheets Is possible.

Furthermore, as another embodiment, as a method for controlling the alignment direction of the vertically aligned liquid crystal molecules of the liquid crystal, in the embodiment described above, a slit is provided on the pixel electrode of the active matrix substrate and the color filter substrate side. Protrusions for orientation control are provided, but they may be reversed. In addition, a structure in which slits are provided on the electrodes on both substrates, and an MVA type with orientation control projections on the electrode surfaces of both substrates It may be a liquid crystal panel.

[0110] A method using vertical alignment films in which pretilt directions (alignment processing directions) defined by a pair of alignment films other than the MVA type are orthogonal to each other may be used. Also, it may be called VATN (Vertical Alibnment Twisted Nematic) mode, which may be VA mode in which the liquid crystal molecules are twisted. The VATN method is more preferable for the present invention because there is no decrease in contrast due to light leakage at the alignment control protrusion. The pretilt is formed by optical alignment or the like.

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

[0112] The first liquid crystal drive unit (1) of the display controller performs the drive signal processing such as γ conversion and overshoot on the 8-bit input signal (video source) from the input unit, and the first liquid crystal panel 8bit gradation data is output to the first panel source driving means.

[0113] On the other hand, the second liquid crystal drive unit (2) performs signal processing such as γ conversion and overshoot on the 8-bit input signal from the input unit to perform the second panel of the second liquid crystal panel. Output 8-bit gradation data to the source drive means.

[0114] The first liquid crystal panel, the second liquid crystal panel, and the output image output as a result are 8 bits, one-to-one corresponding to the input signal, and an image faithful to the input image.

[0115] As described above, the liquid crystal display device 100 having the above-described configuration is configured such that the polarizing axes of the polarizing plate A and the polarizing plate B, and the polarizing plate B and the polarizing reflecting plate are orthogonal to each other, as shown in FIG. And That is, the polarization axes (transmission axes) of the polarizing plates A and B, the polarizing plate B, and the polarizing reflector are respectively arranged in a cross-cored manner.

[0116] This improves the contrast compared to the case where there is only one first liquid crystal panel. Can. In addition, since the polarizing reflector is provided on the light source side, when the light transmitted through the polarizing reflector from the light source is irradiated to the second liquid crystal panel, the light does not pass through the second liquid crystal panel. The strong light (return light) is reflected again by the polarizing reflector and applied to the second liquid crystal panel. In this way, the light of the light source power is irradiated on the second liquid crystal panel through the polarizing reflector so that the luminance can be increased.

[Embodiment 2]

In the above embodiment, the power described in the case where each of the two panels of the liquid crystal display device 100 has a color filter. In this embodiment, only one of the panels is provided with a color filter. An example will be described. This is advantageous in terms of cost because the RGB forming process can be reduced compared to the case of forming color filters on both panels.

This embodiment will be described with reference to FIGS. 11 and 12. FIG. 11 shows a schematic cross-sectional outline of the liquid crystal display device of the present embodiment based on the present invention. Figure 12 shows the configuration of a liquid crystal display device including a polarizing plate.

Compared with the liquid crystal display device 100 shown in FIG. 1, the liquid crystal display device 100 shown in FIG. 11 does not form the color filter 21 on the second liquid crystal panel, but has the color filter 21 only on the first liquid crystal panel. It differs in the point that it formed.

[0120] In order to maintain the same color reproducibility as in the conventional example, the film thickness of the color filter 21 of the first liquid crystal panel is the same as that of the color filter 21 in the case of a conventional single panel. do it. This time, the film thickness of the color filter 21 of the first LCD panel was set to 1.8 m. The second liquid crystal panel on the side where the color filter 21 is not provided is driven based on the first liquid crystal panel provided with the color filter 21. For example, in a blue display pixel with the first liquid crystal panel, the pixel of the second liquid crystal 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

[0121] Note that the panel provided with the color filter 21 may be on the second liquid crystal panel side, contrary to the above example. Since the other configuration 'operation is the same as that of the liquid crystal display device 100 shown in Fig. 1 of the basic configuration, description thereof is omitted here. [0122] When the liquid crystal display device 100 having the above configuration is used, the process of forming the RGB color filter 21 of three primary colors (red, green, and blue) is 1 compared to the liquid crystal display device 100 shown in FIG. This is advantageous in terms of cost.

[0123] Another example of the present embodiment will be described with reference to FIG. FIG. 13 is a schematic cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.

[0124] In the liquid crystal display device 100 shown in FIG. 11, when the black matrix layer (hereinafter referred to as BM) 24 is formed of a resin on the panel on which the color filter 21 is not provided, the film thickness of the BM resin is thick. In some cases, the alignment state may be disturbed near the edge of the BM (reference; the resin BM is inferior in light-shielding properties compared to the metal BM, so a thick film is required).

In order to solve this problem, in the liquid crystal display device 100 shown in FIG. 13, a transparent layer 27 not containing 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.

[0126] For example, the transparent layer 27 may be a negative acrylic photosensitive resin solution photosensitive material containing no color pigment. Then, in the liquid crystal display device 100 shown in FIG. 1, the photomask for forming the pattern of the color filter 21 described in the method of manufacturing the color filter substrate 20 is diverted to form the pattern of the transparent layer 27. Can be used during Alternatively, a dedicated photomask capable of batch exposure may be used. Alternatively, negative photosensitive resin may be used with BM as a mask, backside force exposure, and development may be performed.

[0127] Note that in Fig. 13, the step-up difference of the portion where the color filter 21 is superimposed on the BM24 is emphasized, but in the case of a general acrylic photosensitive resin, it is not applied. 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 100 shown in FIG. 13, 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 prevent the alignment disorder generated by the die. As a result, moiré caused by orientation disorder can be suppressed. Still another example of the present embodiment will be described with reference to FIG. FIG. 14 is a schematic sectional view of a liquid crystal display device according to an embodiment of the present invention.

[0130] The purpose is to prevent alignment disorder caused by the same thick resin BM24 as the liquid crystal display device 100 shown in FIG. Here, a flat film 28 is used.

[0131] The planarization film 28 is used for the purpose of reducing the level difference and reducing the unevenness of the surface. Planarization film

28 is formed by applying and curing a material called a flat sheet material or an overcoat material. Various materials are available on the market for flattened 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 as compared with the liquid crystal display device 100 shown in FIG. .

[0132] If the flat film 28 is used for the thick resin BM24, the level difference due to the resin BM can be reduced, and the alignment disorder generated at the edge of the resin BM can be prevented. As a result, it is possible to suppress the occurrence of moire due to the alignment disorder.

[0133] As described above, according to the present embodiment, even when two liquid crystal display panels are stacked, the occurrence of moire can be reliably suppressed, so that the light transmittance can be improved, and as a result.

Thus, it is possible to realize further higher brightness.

[0134] In each liquid crystal display device disclosed in the present embodiment, it is possible to further increase the brightness by using the hot cathode lamp described in the above embodiment as the light source to be used. .

[0135] When using a hot cathode lamp, it is preferable to use the cooling means as described in the first embodiment as the cooling means.

[Embodiment 3]

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

[0137] With the above configuration, the number of source drivers can be reduced to 1Z3, and the cost can be reduced. That is, if two panels have color filters, both panels exist for each RGB as shown in FIG. On the other hand, if the color filter is formed on only one panel, it is not necessary to form the color filter on the remaining panels. As shown in FIG. The size of one dot shown in Fig. 15 was tripled in the direction of the gate bus line (n = 3) and 1 in the direction of the source bus line (m = 1).

[0139] The gradation data of the monochrome panel having the above configuration was driven so as to be equal to the maximum gradation of the gradation data for three dots of the corresponding color panel.

In another example of the present embodiment, as shown in FIG. 17, the black and white panel dot size is formed so that n = 6 and m = 2. This reduces the source driver to 1Z6 and the gate driver to 1Z2.

[0141] The gradation data of the monochrome panel having the above configuration is set to be equal to the maximum gradation of the gradation data for 12 dots of the corresponding color panel.

[0142] As described above, since only one of the two panels includes the color filter, it is not necessary to form a color filter on the other panel. As a result, the cost can be reduced.

[0143] In addition, in the panel in which the color filter is not formed out of the two panels, the counter substrate facing the active matrix substrate 30 may include at least a black matrix. Thereby, off-leakage of the TFT element 3 formed on the active matrix substrate 30 can be reduced.

[0144] A light-transmitting resin layer may be provided in the opening of the black matrix. In this case, in the case of the resin BM, the film thickness is so thick that it is possible to prevent the occurrence of orientation disorder at the BM edge.

[0145] Further, a light-transmitting resin layer (flattening film) may be provided so as to cover the black matrix and the opening of the black matrix.

[0146] In this case, in the case of the resin BM, the film thickness is so thick that it is possible to prevent the occurrence of alignment disorder at the BM edge. In addition, the exposure / development process using a mask can be omitted.

[0147] As described with reference to FIGS. 15 to 17, in this embodiment, a panel without a color filter ( The size of one dot in the black and white panel (hereinafter referred to as a black-and-white panel) s, three times in the direction of the gate bus line (n = 3) for one dot in a panel with a color filter (hereinafter referred to as a color panel), source bus The size is 1 time (m = l) in the direction of the line. With this configuration, the number of source drivers can be reduced to 1Z3, and costs can be reduced.

[0148] In addition, the gradation data of the monochrome panel in the present invention is set to be equal to the maximum gradation of the gradation data for three dots of the corresponding color panel.

[0149] In another embodiment, the dot size of the black and white panel is formed so that n = 6 and m = 2.

[0150] According to the present embodiment, there is an effect that the source driver can be reduced to 1Z6 and the gate driver can be reduced to 1Z2.

[0151] The gradation data of the monochrome panel of the present invention is set to be equal to the maximum gradation of the 12-dot gradation data of the corresponding color panel.

[0152] In the specific liquid crystal display device 100, as shown in FIG. 18, the size of the pixel electrode 8 in the second liquid crystal panel is three times the size of the pixel electrode 8 in the first liquid crystal panel. It is formed to be.

That is, as shown in FIG. 19, in the active matrix substrate 30 of the first liquid crystal panel, a picture element is formed corresponding to each R GB and the same video signal is displayed by three picture elements. In the active matrix substrate 30 of the second liquid crystal panel, a pixel that is three times as large as one pixel of the first liquid crystal panel is used as the pixel.

[0154] As described above, it is possible to reduce moire caused by gathering the minimum dots of a monochrome panel in multiples of RGB.

[0155] In each liquid crystal display device disclosed in the present embodiment, it is possible to further increase the brightness by using the hot cathode lamp described in the first embodiment as the light source used.

By the way, when the first liquid crystal panel and the second liquid crystal panel are overlapped as in the liquid crystal display device 100, the occurrence of moiré becomes significant. This is due to pixel shift that occurs when two liquid crystal panels are overlapped. In general, it is very difficult to bond two liquid crystal panels without pixel misalignment. Always difficult. In addition, since the glass is thick, moire due to parallax may occur.

In the present invention, a countermeasure against moire when two panels are overlapped in the following embodiment will be described.

[Embodiment 4]

In the present embodiment, description will be given of reducing the generation of moire by providing a light diffusion layer in the liquid crystal display device 100. Here, the light diffusion layer is described as a light diffusion plate.

For example, as shown in FIG. 20, the light diffusing plate may be provided with a light diffusing layer on the outer side of the polarizing plate A of the first liquid crystal panel, or as shown in FIG. In addition, a light diffusing layer may be provided between the second liquid crystal panel and the polarizing plate B, but the most preferable is as shown in FIG. Further, a polarizing plate D is arranged, and a light diffusion layer is provided between the polarizing plate D and the polarizing plate B. Polarizers D and B were arranged in parallel.

[0160] The light diffusing layer includes an acrylic cured resin layer, a TAC (triacetyl cellulose) film, a PET (polyethylene terephthalate) film, and other materials, silica beads, aluminum oxide, and titanium oxide. Use a mixture of transparent particles such as

[0161] As the light diffusion layer, 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. 20 can provide a reliable light diffusion effect while being inexpensive.

[0162] In the light diffusion layer, 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, light with a wavelength of around 555 nm, which is the most visible and dominant as visible light, is 555 ÷ 1.5 = wavelength 370 ηm among the members with a refractive index of 1.5. It can be scattered by refraction.

[0163] In the light diffusion layer, diffusion particles having a refractive index different from that of the 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 nm 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. be able to.

[0164] The light diffusion layer has a diffusion particle having a refractive index different from that of a base material having an average particle diameter of 3.7 μm or more. The child may be dispersed and contained. 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 the refractive action that makes the entire visible light region different depending on the wavelength.

[0165] Further, as shown in FIG. 23, a moiré-dominant structure that does not necessarily limit the gist of the present invention to diffusion in all directions or a layer that exhibits diffusivity perpendicular to the direction of the moire stripes is provided. You may apply. Specifically, a prism-shaped layer (lens sheet) parallel to the structure or stripes can be used. Further, it may be combined with the diffusion layer described above.

[0166] The method of giving haze is 0% to 98% by increasing the concentration of the scattering particles, increasing the refractive index of the scattering particles, optimizing the average particle diameter, thickening the base material, etc. It is possible to control up to close.

[Embodiment 5]

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

[0169] As shown in FIG. 24, the liquid crystal display device 601 includes a Y / C separation circuit 500, a video chroma circuit 5001, an A / D converter 502, a liquid crystal controller 503, a liquid crystal non-504, a backlight driving circuit 505, a back The configuration includes a light 506, a microcomputer 507, and a gradation circuit 508.

[0170] The liquid crystal panel 504 has a two-panel configuration including 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 Y ZC 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. It will be.

[0173] Note that 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 an Internet line. .

Further, tuner unit 600 shown in FIG. 25 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.

[0175] When the liquid crystal display device having the above configuration is a television receiver, for example, as shown in FIG. 26, 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.

[0176] The first casing 301 is formed with an opening 301a through which an image displayed on the liquid crystal display device 601 is transmitted.

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 supporting member is provided below. 308 is attached!

[0178] As described above, the television receiver having the above-described configuration can display high-quality images with higher contrast and higher brightness than those with a single liquid crystal panel.

In each of the above embodiments, as shown in FIG. 1, the force described when two liquid crystal panels are overlapped is not limited to this, and there are three or more liquid crystal panels. The present invention can be applied even when they are stacked. That is, two or more liquid crystal panels are overlapped, and the polarized light transmission layer is provided in a cross-col relationship with the liquid crystal panel sandwiched between them. When the other is the second LCD panel, the first LCD panel is based on the first display signal! Thus, the present invention can also be applied to a liquid crystal display device that displays and displays the second liquid crystal panel based on the second display signal obtained from the first display signal. In this case, at least one of the polarized light transmitting layers may be a polarized light reflecting layer having a polarized light reflection function for reflecting polarized light.

[0180] The present invention is not limited to the embodiments described above, but within the scope of the claims. Various modifications are possible, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. Industrial applicability

Since the liquid crystal display device of the present invention can greatly improve the contrast, it can be applied to a television receiver, a broadcast monitor, and the like.

Claims

The scope of the claims

[1] Two or more liquid crystal panels are stacked, and a polarized light transmission layer is provided in a crossed nicols relationship across the liquid crystal panel, and one of the adjacent liquid crystal panels is the first liquid crystal panel, When the other is the second liquid crystal panel, the first liquid crystal panel displays based on the first display signal, and the second liquid crystal panel obtains the first display signal power. A liquid crystal display device that displays based on a signal,

2. A liquid crystal display device according to claim 1, wherein at least one of the polarized light transmitting layers is a polarized light reflecting layer having a polarized light reflecting function for reflecting polarized light.

[2] An illumination device for supplying display light to the first liquid crystal panel and the second liquid crystal panel is provided,

2. The liquid crystal display device according to claim 1, wherein the polarization reflection layer is disposed at a position closest to the illumination device among a plurality of polarization transmission layers.

3. The liquid crystal display device according to claim 2, wherein a hot cathode fluorescent lamp is used as a light source of the illumination device.

[4] In any one of claims 1 to 3, wherein only one of the first liquid crystal panel and the second liquid crystal panel is provided with a color filter. The liquid crystal display device described.

[5] Equipped with the above color filter! / Wow! 5. The liquid crystal display device according to claim 4, wherein the liquid crystal panel on the / side has an active matrix substrate, and at least a black matrix is formed on a counter substrate facing the active matrix substrate. .

6. The liquid crystal display device according to claim 5, wherein the counter substrate further includes a light transmissive resin layer formed in an opening portion of the black matrix.

7. The liquid crystal display device according to claim 6, wherein the light-transmitting resin layer is formed so as to cover the black matrix and an opening of the black matrix.

[8] One dot size force of the LCD panel on the side without the above color filter n X m times one dot of the LCD panel on the other side with the color filter (n and m are real numbers, at least one of which is a real number)

5. The liquid crystal display device according to claim 4, wherein n is larger than 1 and n is a direction along the gate bus line, and m is a direction along the source bus line.

[9] On the liquid crystal panel provided with the color filter, picture elements composed of red pixels, green pixels, and blue pixels are arranged in a matrix,

The liquid crystal panel on the side provided with the color filter is characterized in that pixels having an integer multiple of picture elements of the liquid crystal panel on the side provided with the color filter are arranged in a matrix. The liquid crystal display device according to claim 4.

[10] Display control means for outputting gradation data as a display signal to the liquid crystal panel and controlling the display of the liquid crystal panel,

The display control means includes

Equipped with the above color filter, the gradation data of one dot of the liquid crystal panel on the side, n X m dots of the liquid crystal panel on the other side with the corresponding color filter (n and m are at least one of the real numbers) Is larger than 1, n is the direction along the gate bus line, and m is the direction along the source bus line), and the floor indicated by the calculation result reflecting the maximum gradation. 5. The liquid crystal display device according to claim 4, wherein the liquid crystal display device is controlled so as to become tone data.

11. The liquid crystal display device according to claim 1, wherein a light diffusing layer having light diffusibility is provided on at least one of the superposed liquid crystal panels.

[12] In a television receiver comprising a tuner unit that receives a television broadcast and a display device that displays the television broadcast received by the tuner unit,

In the above display device, two or more liquid crystal panels are overlapped, and a polarization transmission layer is provided in a cross-col relationship with the liquid crystal panel sandwiched therebetween, and one of the adjacent liquid crystal panels among the overlapped liquid crystal panels is the first. When the other liquid crystal panel is the second liquid crystal panel, the first liquid crystal panel displays based on the first display signal, and the second liquid crystal panel is obtained from the first display signal. A liquid crystal display device for displaying based on a second display signal, wherein at least one of the polarized light transmitting layers is a polarized light reflecting layer having a polarized light reflecting function of reflecting polarized light. A television receiver characterized by being a liquid crystal display device.