TW201804226A - Liquid crystal display device - Google Patents

Abstract

Provided is a liquid crystal display device capable of performing effective translucent display. A liquid crystal layer is sandwiched between two substrates 10, 50. A polarization layer 24 is provided on the liquid crystal layer 40 side of at least one substrate of the two substrates 10, 50. The liquid crystal display device has a contact hole 28 that electrically connects to each other a substrate-side conductive layer 22 that is provided on the substrate 10 side of the polarization layer 24, and a liquid crystal-side conductive layer 26 that is provided on the liquid crystal layer 40 side of the polarization layer 24.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device in which a polarizing layer is disposed on a liquid crystal layer side of a substrate.

Liquid crystal display devices (LCDs) have been widely used in the past. As the liquid crystal display device, various liquid crystal display devices are known. As the liquid crystal driving method, in addition to twisted nematic (TN), methods such as a vertical alignment (VA) type, in-plane switching (IPS), and the like are used. Further, as a display method, in addition to a transmission method that transmits light through a liquid crystal, there are a reflection method, a semi-transmission method, and the like. Further, an LCD is also known which is flexible and can be bent as a whole by using a resin substrate (plastic substrate).

FIG. 7 shows a configuration of a conventional transflective liquid crystal display device. A liquid crystal layer 114 is provided between the thin film transistor (TFT) substrate 110 and the opposite substrate 112. A polarizing layer 122 is provided on the outside of the TFT substrate 110 via a phase difference compensation plate 120, and a polarizing layer 118 is provided on the outside of the opposite substrate 112 via a phase difference compensation plate 116. Further, a step portion 130 protruding toward the liquid crystal layer 114 side is provided on a part (reflection region) of the TFT substrate 110 on the liquid crystal layer 114 side, and a reflection plate 132 is provided on the step portion 130.

In the transmission area, the light from the lower side in the figure is directed upward in the order of the polarizing layer 122, the retardation compensation plate 120, the TFT substrate 110, the liquid crystal layer 114, the opposite substrate 112, the retardation compensation plate 116, and the polarizing layer 118. by. On the other hand, in the reflection area, light from the upper side in the figure depends on the polarizing layer 118, the phase difference compensation plate 116, the opposite substrate 112, the liquid crystal layer 114, reflected by the reflection plate 132, the opposite substrate 112, and the phase difference compensation. The plate 116 and the polarizing layer 118 pass through in this order.

In this way, in the case of the semi-transmission method, light passes through the secondary liquid crystal layer 114 in the reflection region. Therefore, in order to make the display of the reflection region and the transmission portion the same, the cell gap (liquid crystal layer) of the reflection region is used. A thickness of 114) is provided so as to be 1/2 of the transmission area, and a reflecting plate 132 is provided on the stepped portion 130. In addition, if the structure is still normal, the reflection portion and the transmission portion are reversed in black and white. Therefore, the phase difference compensation plates 116 and 120 are used and the light passing through the liquid crystal layer 114 is circularly polarized. In this manner, by applying a voltage to the pixel electrodes on the TFT substrate 110, display is performed in both the transmission region and the reflection region.

The liquid crystal display device performs display by passing polarized light through the liquid crystal layer and changing the polarization state. Therefore, a polarizing layer is required. As this polarizing layer, in addition to an iodine-based polarizing layer, a dye-based polarizing layer is known (see Patent Documents 1, 2, and 3). [Prior Art Literature] (Patent Literature)

Patent Document 1: Japanese Patent Application Publication No. 2013-47842 Patent Document 2: Japanese Patent Application Publication No. 2014-167089 Patent Document 3: International Publication No. WO2007 / 138980

[Problems to be Solved by the Invention] Here, in the case of the semi-transmission method, the step portion 130 is required. Therefore, a process for forming the stepped portion 130 is added, and the steps become complicated. Further, light leakage occurs at the edge portion of the stepped portion 130 and the display quality is reduced. When the in-plane switching (IPS) method is used, it is difficult to use circularly polarized light and it is difficult to use the semi-transmission method. Further, in a flexible LCD, a phase difference occurs in a corresponding position due to a resin substrate being bent. Therefore, by changing the state of the polarized light here, the contrast is easily deteriorated. [Technical means to solve the problem]

The present invention is a liquid crystal display device comprising a liquid crystal layer sandwiched between two substrates. The liquid crystal display device includes a polarizing layer provided on a liquid crystal layer side of at least one of the two substrates. A substrate-side conductive layer provided on the substrate side of the polarizing layer; a liquid crystal-side conductive layer provided on the liquid crystal layer side of the polarizing layer; and a contact hole provided on the polarizing layer and conducting the substrate side The layer is electrically connected to the liquid crystal-side conductive layer.

The polarizing layer is preferably a dye-based polarizing layer obtained by dyeing polyvinyl alcohol (PVA) with a dichroic dye.

The substrate provided with the polarizing layer is preferably a TFT substrate, which uses a thin film transistor to control the application of an electric field to the liquid crystal layer, and connects the thin film transistor on the TFT substrate and the polarizing layer with the contact hole. Electrodes.

In addition, in the other substrate that is not the TFT substrate, that is, the opposite substrate, it is preferable to provide a second polarizing layer on the side opposite to the liquid crystal layer.

A phase difference compensation plate is preferably provided between the counter substrate and the second polarizing layer. [Effect of the invention]

By disposing the polarizing layer on the liquid crystal layer side of the substrate, even a TFT can easily adopt a semi-transmissive method. Moreover, even the IPS method can use a semi-transmission method. When it is flexible, the display is deteriorated due to the birefringence of the resin substrate (plastic substrate), but this situation can be prevented by this technique.

Hereinafter, embodiments of the present invention will be described based on the drawings. The present invention is not limited to the embodiments described herein.

<Configuration> FIG. 1 is a cross-sectional view (schematic diagram) showing an example of a configuration of a liquid crystal display device according to an embodiment, and a diagram of a data line DL is omitted. FIG. 2 is a plan view of the TFT substrate 36. In addition to the substrate 10, the polarizing layer 24, the photosensitive layer 38, and the alignment film 34, the pattern of the gate insulating film 16 is also omitted. All are schematic diagrams, and the proportions have also been changed to make it easier to observe the various parts.

On the transparent substrate 10 formed of glass, resin, or the like, pixel circuits and wirings including TFTs (thin film transistors) are formed. In addition, a data driver, a gate driver, and the like may be disposed on a peripheral portion of the substrate 10.

A TFT 12 is arranged on the substrate 10 for each pixel. In the figure, two TFTs 12 are shown. In the lower portion (on the substrate 10) of almost the center of the TFT 12, a gate electrode 14 is arranged, and the gate electrode 14 is connected to a gate line. The gate insulating film 16 is formed to cover the gate electrode 14, and the semiconductor layer 18 is formed to cover the gate insulating film 16. The gate insulating film 16 is formed of an insulator such as SiO ₂ . In addition, the semiconductor layer 18 is formed of amorphous silicon or polycrystalline silicon, and a channel region with almost no impurities is provided in a portion directly above the gate electrode 14, and both sides become a source region imparted with conductivity by doping. And drain region.

On the drain region of the TFT 12, a drain electrode 20 having a metal (for example, aluminum) is disposed (electrically connected), and on the source region, a source electrode 22 having a metal (for example, aluminum) is disposed (electrically connected). Furthermore, as described below, the drain electrode 20 is connected to a data line for supplying a data voltage. Therefore, in a state where the TFT 12 is turned on according to the signal of the gate line, the data voltage of the data line is read.

The polarizing layer 24 is formed so as to cover the TFT 12. The polarizing layer 24 is a dyeable polarizing layer made by dyeing a PVA (polyvinyl alcohol) resin with a dichroic dye, and covers the TFT 12 to be insulated and flatten its surface.

A display electrode 26 is provided on the surface of the polarizing layer 24. This display electrode 26 is an individual electrode separated for each pixel, and is, for example, a transparent electrode made of ITO (indium tin oxide) or the like.

The polarizing layer 24 is bonded to the substrate with a water-based adhesive glyoxal, and a photosensitive polyimide (OPTMER (trade name) manufactured by JSR Corporation) is formed thereon with a thickness of 0.5 μm thereon. The layer 38 is patterned through exposure and development steps. Furthermore, it immersed in warm water (80 degreeC), and patterned the polarizing layer. Through this step, a contact hole 28 is formed above the source electrode 22 of the polarizing layer 24, and the ITO of the display electrode 26 is filled therein, whereby the source electrode 22 and the display electrode 26 are electrically connected.

The insulating layer 30 is formed so as to cover the display electrode 26, and a common electrode 32 is arranged on the surface of the insulating layer 30. This embodiment is an IPS method. A common electrode 32 is formed on the display electrode 26 at intervals, and a horizontal electric field generated by applying a voltage between the two is used to control the alignment in the horizontal plane of the liquid crystal to perform display. As the arrangement of electrodes for applying a horizontal electric field to the liquid crystal, a known arrangement can be adopted as appropriate.

The alignment film 34 on the substrate 10 side is formed so as to cover the common electrode 32, thereby forming a TFT substrate 36.

A liquid crystal layer 40 is disposed on the alignment film 34 of the TFT substrate 36, and an alignment film 42 on the opposite substrate side is disposed above the liquid crystal layer 40. Therefore, the alignment of the liquid crystal layer 40 is controlled by the alignment film 34 on the lower side, and the alignment of the liquid crystal layer 40 is controlled by the alignment film 42 on the upper side. That is, the initial alignment state of the liquid crystal of the liquid crystal layer 40 (when no electric field is applied) is determined by the alignment films 34 and 42. Furthermore, by applying an electric field to the liquid crystal layer 40, the alignment of the liquid crystal is controlled, thereby controlling the transmission or non-transmission of light.

A color filter layer 44 is formed on the alignment film 42. In the case of color display, generally, three types of pixels of RGB are combined to function as display pixels of color display, and each pixel is provided with a color filter of any color of RGB.

A glass or resin substrate 50 is disposed on the color filter layer 44, and a diffusion layer 52 is disposed on the substrate 50. Since the diffusion layer 52 is formed by dispersing small balls (beads) in a transparent material, the transmitted light can be diffused to eliminate the intensity (deviation) of light caused by the place where the reflected light is present.

A polarizing layer 56 is disposed above the diffusion layer 52 via a phase difference compensation plate 54. Here, the phase difference compensation plate 54 is a composite of a positive A plate and a positive C plate, and can compensate the phase difference caused by the difference in the wavelength of light, etc., and has the effect of expanding the viewing angle. Further, the polarizing layer 56 is paired with the polarizing layer 24 and can transmit or block light.

In addition, in practice, a color filter layer 44 and an alignment film 42 are formed on one side of the substrate 50, and a diffusion layer 52, a retardation compensation plate 54, and a polarizing layer 56 are formed on the other side, thereby forming a counter substrate 58 The liquid crystal layer 40 is formed by sealing the liquid crystal between the TFT substrate 36 and the counter substrate 58 (between the alignment films 34 and 42).

In the case of the semi-transmissive type, a reflection plate 80 is disposed at a desired portion of the pixel. The reflecting plate 80 may be a metal film formed with the source electrode 22. Therefore, the reflection plate 80 is formed on the substrate 10 and becomes a flat metal film. In this example, the reflecting plate 80 is arranged near the TFT 12, but it can be arranged in any region in the pixel. In this example, the reflection plate 80 is connected to the source electrode 22. Therefore, it is preferable to use this part as an electrode of a storage capacitor. However, the reflection plate 80 may not be connected to the source electrode 22.

<Action> Then, for example, the polarization direction of the polarizing layer 24 of the TFT substrate 36 is set to a direction where the absorption axis is 90 °, and the polarization direction of the polarizing layer 56 facing the substrate 58 is set to a direction where the absorption axis is 0 °.

When light passes upward from the lower side of the TFT substrate 36 (transmission type), if the change in the polarization direction of the liquid crystal layer 40 is 0 without applying an electric field, black (non-transmission) is displayed. Moreover, when the polarization direction in the liquid crystal layer 40 is changed by 90 ° by applying an electric field, white (transmission) is displayed. Furthermore, by controlling the applied voltage, the degree of rotation in the polarization direction in the liquid crystal layer 40 can be controlled, thereby controlling the degree of transmission (brightness).

In this embodiment, the surface of a metal member or the like formed at the same time as the source electrode 22 is used as the reflection plate 80. At this time, without applying a voltage to the liquid crystal layer 40, the polarized light from the polarizing layer 56 directly reaches the polarizing layer 24, so it cannot be transmitted there and becomes black. On the other hand, when a voltage is applied to the liquid crystal layer 40, the polarization direction is changed by 90 ° so that the polarized light from the polarizing layer 56 can pass through the polarizing layer 24. Furthermore, although the direction of the polarized light is reversed (shifted by 180 °) by the reflection plate 80, it passes through the polarizing layer 24, is shifted by 90 ° on the liquid crystal layer 40, and passes through the polarizing layer 56, and becomes white (transmissive). Here, as described above, with respect to the reflected light, the dispersion caused by the local strength of the light can be removed by the diffusion layer 52.

As described above, in the present embodiment, black and white (transmission or non-transmission) switching of transmitted light and reflected light can be performed by applying a voltage. Therefore, even though it is an IPS-type liquid crystal display device, it can function as a transflective liquid crystal display device.

Furthermore, a black matrix is arranged between the pixels to prevent light transmission. In addition, large irregularities are formed on the top surfaces of the drain electrode 20 and the source electrode 22 of the TFT 12. Where such large irregularities are present, it is not good to use them as the reflecting plate 80. Therefore, this part is preferably covered with a black matrix. In addition, small irregularities can be formed on the surface functioning as the reflection plate 80 to diffuse reflected light and reduce variation.

<Circuit Configuration> Here, a circuit diagram of a pixel circuit is shown in FIG. 3. In this way, the drain electrode 20 of the TFT 12 is connected to the data line Data. The gate 14 of the TFT 12 is connected to a gate line Gate, and the source 22 is connected to a display electrode 26 adjacent to the liquid crystal layer 40. In the example shown, the TFT 12 is an n-channel or a p-channel. The common electrode 32 is opposed to the display electrode 26 with the liquid crystal layer 40 interposed therebetween, and the common electrode 32 is connected to a fixed potential power source, such as ground.

One end of the auxiliary capacitor 60 is connected to the source electrode 22, and the other end of the auxiliary capacitor 60 is connected to a power source having a fixed potential, such as ground, via an auxiliary capacitor line 62.

Here, a configuration example of the storage capacitor 60 is shown in FIG. 4. An auxiliary capacitor line 62 connected to the ground is formed on the substrate 10, and an insulating film 64 is formed on the auxiliary capacitor line 62. The auxiliary capacitor line 62 is preferably formed by the same process as the gate electrode 14; the insulating film 64 is preferably formed by the same process as the gate insulation film 16. A part of the source electrode 22 is extended, and the storage capacitor electrode 66 is formed so as to face the storage capacitor line 62 via the insulating film 64 (see FIG. 2). Therefore, the auxiliary capacitor line 62 and the auxiliary capacitor electrode 66 sandwich the insulating film 64 to form the auxiliary capacitor 60.

In addition, the auxiliary capacitor 60 can be formed in a desired region within one pixel. It is preferable that a flat metal portion is located in a display region (for example, a central portion in the vertical direction of the display region). The reflection plate 80 is used. The metal portion is located in the auxiliary capacitor 60 and is connected to the source electrode 22. Moreover, in the figure, the electrode portion of the auxiliary capacitor is also a metal portion connected to the source electrode 22, and the reference numeral 22 is used.

A plurality of pixels of the liquid crystal display device are arranged in a matrix. In the case of a stripe type, each column is sequentially assigned with RGB colors.

For example, the data line Data is arranged between the columns of the pixels in a column direction, and the gate line Gate is arranged between the rows of the pixels in a row direction. The storage capacitor lines 62 are arranged in the row direction at the middle of the row of pixels.

The gate lines Gate of each row are sequentially set to H level according to the vertical scanning of the screen. The data lines Data of each column are sequentially supplied to the corresponding pixels in a manner of supplying the data of the pixels, and the data of the pixels are to be supplied to the data lines of the columns of the rows and columns selected by the gate line Gate. Data.

Therefore, the TFT 12 of each pixel is turned on when the data voltage of the pixel is supplied to the data line Data, and the data voltage is sequentially accumulated in the storage capacitor 60 of each pixel. In addition, the storage capacitor of each pixel can maintain the written data voltage even after the TFT 12 of the pixel is turned off, until the next data voltage is written into the storage capacitor 60. Therefore, if a data voltage is written for each frame, the storage capacitor 60 can maintain the data voltage during one frame and apply the data voltage to the liquid crystal layer 40. Therefore, a liquid crystal display corresponding to a data voltage can be implemented in each pixel. Furthermore, in the case of color display, display of pixels of a corresponding color is performed based on the data voltage supplied to each RGB.

Here, in this embodiment, the polarizing layer 24 is formed inside the TFT 12. Therefore, metal electrodes such as the source electrode 22 for forming the TFT 12 are located outside the polarizing layer 24. Therefore, regarding the light incident from above the device, after passing through the polarizing layer 24, the reflected light passes through the polarizing layer 24 again and passes through the liquid crystal layer 40 and the polarizing layer 56. Therefore, the liquid crystal layer 40 is switched in the same manner as the reflective portion and the transmissive portion. Therefore, the IPS method can also be a semi-transmissive type.

Moreover, even in a liquid crystal mode other than the IPS method, a high-performance semi-transmissive type can be easily realized. In addition, since the electrode surface of the TFT substrate 36 such as the storage capacitor electrode 66 can be used as the reflection plate 80, the aperture ratio can be improved compared to a case where another reflection plate is provided.

The polarizing layer 24 functions as an insulating film that electrically separates the TFT 12 and the display electrode 26. By forming a contact hole 28 here, the electrical connection between the TFT 12 and the display electrode 26 can be achieved. Therefore, it is not necessary to separately form an insulating film. Further, the polarizing layer 24 is an organic film (resin film) such as PVA, and can also obtain a planarization effect.

<Polarizing Layer 24> The polarizing layer 24 is formed inside the substrate 10. Here, a normal polarizing layer is formed on the outside of the substrate 10 (on the opposite side of the liquid crystal layer 40). The reason is that an iodine-based polarizing layer is generally used as the polarizing layer, and the iodine-based polarizing layer is formed of a material obtained by dyeing a resin with iodine and an iodine compound. That is, iodine and iodine compounds are not heat-resistant, and are deteriorated by heating at about 100 ° C. On the other hand, an alignment film 34 needs to be formed on the surface of the substrate 10 near the liquid crystal layer 40. When this alignment film 34 is formed, it is necessary to heat it to at least more than 100 ° C and more than 130 ° C (preferably above this temperature). Therefore, when it is assumed that an iodine-based dyeing material is used for the polarizing layer, it is necessary to form a polarizing layer outside the substrate 10 after forming the alignment film 34.

On the other hand, in Patent Documents 1, 2, and the like, a polarizing layer using a dye (dichroic dye) is shown. This dye is relatively heat resistant. For example, according to various dyes described in Patent Documents 1 and 2, it is possible to prevent deterioration by heating at about 130 ° C. In particular, a dye containing an azo compound and a salt thereof described in Patent Document 2 is preferable.

Therefore, the polarizing layer 24 can be formed by using such a dye, and the polarizing layer 24 can be formed inside the substrate 10.

Moreover, as a base material of a polarizing layer, as described in patent documents 1, 2, and 3, it is preferable to stretch PVA-type resin.

Specifically, it is preferable to use a polarizing film obtained by a procedure described below. Polyvinyl alcohol having a thickness of 75 μm was immersed in a 45 ° C. aqueous solution having the following concentration for 4 minutes: 0.01% of the dye of the following structural formula (1) shown in Example 1 of Patent Document 3, and 0.01% of direct red (CIDirect Red) 81, 0.03% of the dye shown in Example 1 of Japanese Patent No. 2622748 and represented by the following structural formula (2), 0.03% of the example of Japanese Patent Laid-Open No. 60-156759 The dye represented by the following structural formula (3) disclosed in 23 and 0.1% mirabilite. In a 3% boric acid aqueous solution, this film was stretched 5 times at 50 ° C, kept in a stretched state, washed directly with water and dried to obtain a neutral color (gray in parallel and black in orthogonal) .

(1)

(2)

(3)

(1)

(2)

(3)

Furthermore, in this example, the polarizing layer 56 is disposed outside the substrate 50, and may be a non-dying polarizing layer with low heat resistance, or a polarizing layer made of, for example, iodine or an iodine compound.

Furthermore, if the alignment film 34 is an alignment film formed at a low temperature, it may be a polarizing layer 24 having low heat resistance.

<Another Embodiment> FIG. 5 shows a configuration of another embodiment. In this example, a polarizing layer 56 is disposed inside the substrate 50 of the counter substrate 58. Therefore, a material having high heat resistance is used for this polarizing layer 56. The color filter layer 44, the diffusion layer 52, and the phase difference compensation plate 54 are omitted. The reason is that these structures are not necessarily required structures, and these structures may be provided. When these structures are arranged, the phase difference compensation plate 54 is arranged inside the polarizing layer 56.

In this example, a flexible resin substrate is used for the substrates 10 and 50. Therefore, the entire liquid crystal display device is flexible and bendable.

Here, as described above, the polarizing layer 56 is disposed inside the substrate 50. The polarizing layer 24 is also located inside the substrate 10, so the polarizing layers 24 and 56 are both located inside the substrate 10 and 50.

The substrates 10 and 50 are made of resin. If the resin substrate is bent, the transmitted light will have a phase difference depending on the place. Therefore, since the transmitted light having the phase difference passes through the polarizing layers 24 and 56, display unevenness occurs.

According to this embodiment, since the polarizing layers 24 and 56 are located inside the substrates 10 and 50, it is possible to exclude the following cases: a phase difference occurs due to the bending of the substrates 10 and 50, which affects the polarizing layers 24 and 56, Light transmission and non-transmission control.

<Further another embodiment> FIG. 6 shows the structure of still another embodiment. This example is a TN-type liquid crystal display device. Therefore, the counter substrate 58 has a counter electrode 70, and a voltage is applied to the display electrode 26, and an electric field is applied to the liquid crystal layer 40 between the display electrode 26 and the counter electrode 70 based on the data voltage to control the liquid crystal layer Rotation in the polarization direction in 40. In the case of the TN system, white is normally displayed when no voltage is applied, and black is displayed by applying a voltage.

In the TFT substrate 36, a display electrode 26 is formed on the polarizing layer 24 for each pixel. The alignment film 34 is formed so as to cover the display electrode 26, and a liquid crystal layer 40 is disposed on the alignment film 34. In the counter substrate 58, a counter electrode 70 is formed on the inner side of the substrate 50 with a color filter layer 44 interposed therebetween. The counter electrode 70 is also a transparent electrode formed of ITO or the like. The counter electrode 70 is a single common electrode, and faces the plurality of display electrodes 26. An alignment film 42 is formed on the lower surface of the counter electrode, and the alignment film 42 is adjacent to the liquid crystal layer 40.

With such a configuration, an electric field can be applied between the display electrode 26 and the counter electrode 70 of each pixel in accordance with the data voltage to perform display for each pixel.

In addition, even if it is a vertical alignment (VA) method, etc., a liquid crystal display device can be comprised with the same structure. Furthermore, a flexible device can also be produced in the same manner using a receiving substrate as shown in FIG. 5.

10, 50‧‧‧ substrate
12‧‧‧TFT
14‧‧‧Gate
16‧‧‧Gate insulation film
18‧‧‧ semiconductor layer
20‧‧‧ Drain
22‧‧‧Source
24, 56, 118, 122‧‧‧ polarizing layers
26‧‧‧Display electrode
28‧‧‧ contact hole
30‧‧‧ Insulation
32‧‧‧Common electrode
34, 42‧‧‧ Alignment film
36, 110‧‧‧TFT substrate
38‧‧‧ Photosensitive layer
40、114‧‧‧LCD layer
44‧‧‧ color filter layer
52‧‧‧ diffusion layer
54, 116, 120‧‧‧‧Phase difference compensation board
58‧‧‧ Opposite substrate
60‧‧‧Auxiliary capacitor
62‧‧‧ auxiliary capacitor line
64‧‧‧ insulating film
66‧‧‧Auxiliary capacitor electrode
70, 112‧‧‧ Opposite electrode
80, 132‧‧‧Reflector
130‧‧‧step difference
Data‧‧‧Data Cable
Gate‧‧‧Gate line

FIG. 1 is a diagram showing a configuration of a liquid crystal display device according to an embodiment. Fig. 2 is a plan view of a liquid crystal display device according to the embodiment. FIG. 3 is a diagram showing a configuration of a pixel circuit. Fig. 4 is a diagram showing a configuration of an auxiliary capacitor. FIG. 5 is a diagram showing a configuration of a liquid crystal display device according to another embodiment. FIG. 6 is a diagram showing a configuration of a liquid crystal display device according to still another embodiment. FIG. 7 is a diagram showing a configuration of a conventional transflective liquid crystal display device.

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10, 50‧‧‧ substrate

12‧‧‧TFT

14‧‧‧Gate

16‧‧‧Gate insulation film

18‧‧‧ semiconductor layer

20‧‧‧ Drain

22‧‧‧Source

24, 56‧‧‧ polarizing layer

26‧‧‧Display electrode

28‧‧‧ contact hole

30‧‧‧ Insulation

32‧‧‧Common electrode

34, 42‧‧‧ Alignment film

36‧‧‧TFT substrate

40‧‧‧LCD layer

44‧‧‧ color filter layer

52‧‧‧ diffusion layer

54‧‧‧Phase difference compensation board

58‧‧‧ Opposite substrate

Claims (8)

A liquid crystal display device is formed by sandwiching a liquid crystal layer between two substrates. The liquid crystal display device includes: a polarizing layer disposed on a liquid crystal layer side of at least one of the two substrates; a substrate side A conductive layer provided on the substrate side of the polarizing layer; a liquid crystal side conductive layer provided on the liquid crystal layer side of the polarizing layer; and a contact hole provided on the polarizing layer; The liquid crystal-side conductive layer is electrically connected. The liquid crystal display device according to claim 1, wherein the polarizing layer is a dye-based polarizing layer obtained by dyeing polyvinyl alcohol with a dichroic dye. The liquid crystal display device according to claim 1, wherein the substrate provided with the polarizing layer is a TFT substrate formed with a thin film transistor, that is, a TFT. The thin film transistor is used to control the application of an electric field to the liquid crystal layer. The layer includes an electrode of the TFT formed on the TFT substrate, the electrode on the polarizing layer includes a display electrode for applying a display electric field to the liquid crystal layer, and the electrode of the TFT is connected to the electrode with the contact hole. Display electrodes. The liquid crystal display device according to claim 3, wherein a second polarizing layer is provided on the opposite side of the liquid crystal layer from the other substrate that is not the TFT substrate, that is, the opposing substrate. The liquid crystal display device according to claim 4, wherein a retardation plate is provided between the counter substrate and the second polarizing layer. The liquid crystal display device according to any one of claims 3 to 5, further comprising a reflective plate on the TFT substrate side of the polarizing layer. The liquid crystal display device according to claim 1, wherein the liquid crystal layer is a liquid crystal layer of an in-plane switching method. The liquid crystal display device according to claim 1, wherein the two substrates are resin substrates.