KR102531324B1 - 3-glasses display panel and display device having the same - Google Patents

Abstract

The present invention relates to a display panel to which three substrates are applied and a display device including the same.
A display device according to the present invention includes a display panel that outputs an image by receiving light from a backlight unit. At this time, the display panel includes three substrates. TFTs are disposed on two substrates, color filters are disposed on one substrate, and a polarization layer is disposed on the middle substrate.

Description

Display panel and display device including the same {3-GLASSES DISPLAY PANEL AND DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a display panel, and relates to a display panel to which three substrates are applied.

In addition, the present invention relates to a display device including a display panel to which three substrates are applied.

Examples of the display device include a liquid crystal display (LCD) device and an organic light emitting diode display (OLED) display device.

Among them, a liquid crystal display device generally includes two substrates, including a TFT (Thin Film Transistor) substrate on which thin film transistors are disposed and a color filter substrate on which color filters are disposed. The base material of the substrate is usually a glass material, and a polymer film is also used.

1 schematically shows a display panel including two substrates.

Referring to FIG. 1 , a general display panel includes a first substrate 110 on which TFTs are disposed on an upper surface and a second substrate 120 on which color filters are disposed on a lower surface. An upper polarizer 130a is disposed above the second substrate 120 , and a lower polarizer 130b is disposed below the first substrate 110 . In addition, a pad electrode 115 is disposed on the first substrate 110 to drive the TFT.

Meanwhile, with the development of display technology, recently, a display panel including four substrates has been proposed to improve a 3D image or a contrast ratio (CR).

2 schematically shows a conventional display panel including four substrates.

Referring to FIG. 2 , the illustrated display panel has a structure in which a first panel unit 210 and a second panel unit 220 are bonded to a bonding unit 230 .

The first panel unit 210 includes a first substrate 211 on which a TFT is disposed on an upper surface and a second substrate 212 on which a color filter is disposed on a lower surface. In addition, a first polarizer 213 is disposed below the first substrate 211 of the first panel unit 210 . In addition, a pad electrode 215 for driving a TFT is disposed on the first substrate 211 . The first panel unit 210 serves as, for example, a light valve.

The second panel unit 220 includes a third substrate 221 on which TFTs are disposed on an upper surface and a fourth substrate 222 on which color filters are disposed on a lower surface. In addition, a second polarizing plate 223 is disposed above the fourth substrate 222 of the second panel unit 210 , and a third polarizing plate 224 is disposed below the third substrate 221 . In addition, a pad electrode 225 for driving a TFT is disposed on the third substrate 221 . This second panel part plays a role of realizing the image RGB.

FIG. 3 schematically illustrates a display device including the display panel shown in FIG. 2 . 3 shows an example of a liquid crystal display device.

Referring to FIG. 3 , the illustrated display device includes a display panel 301 and a backlight unit 302 providing light to the display panel 301 .

The display panel 301 further includes spacers 216 and 226 and liquid crystals 217 and 227 in the structure of the display panel shown in FIG. 2 . A liquid crystal filling space is defined between the first substrate 211 and the second substrate 212 by the spacer 216 , and the liquid crystal 217 is filled in the liquid crystal filling space. Similarly, a liquid crystal filling space is defined between the third substrate 221 and the fourth substrate 222 by the spacer 226 , and the liquid crystal 227 is filled in the liquid crystal filling space.

As such, in the case of a display panel including four substrates, it is known that there is an advantage in realizing a three-dimensional (3D) structure or improving a contrast ratio (CR). For example, when two panels having a contrast ratio of 1,000:1 are overlapped, a CR of 1,000×1,000:1, that is, 1,000,000:1 can be theoretically displayed.

However, since two more substrates are added, the material cost becomes more expensive, and the thickness and weight of the display panel increase accordingly.

The present invention is to solve the above problems, and an object of the present invention is to provide a display panel including three substrates.

Another object of the present invention is to provide a display device including the above three substrates.

A display panel according to an embodiment of the present invention for solving the above problems includes a first substrate, a first polarizing plate, a second substrate, a third substrate and a second polarizing plate. A TFT (Thin Film Transistor) is disposed on the upper surface of the first substrate. The first polarizer is disposed under the first substrate. A second substrate is spaced apart from above the first substrate, and a color filter and a polarization layer are disposed on the upper surface. A third substrate is spaced apart from above the second substrate, and TFTs are disposed on the lower surface. A second polarizer is disposed on the third substrate.

As described above, the display panel according to the present embodiment includes three substrates. Through this, it can contribute to thinning and lightening compared to a conventional display panel including four substrates.

In addition, the display panel according to this embodiment includes a reverse panel structure in which a color filter is disposed on the upper surface of the second substrate and a TFT is disposed on the lower surface of the third substrate. Even with this reverse panel structure, image output is possible.

In this case, in the case of the display panel according to the present embodiment, a polarization layer is disposed on the color filter of the second substrate. Such a polarizing layer may be formed by, for example, coating and curing a composition including smectic RM molecules and a dichroic dye. In this way, when the polarizing layer is disposed on the color filter, damage is caused to the liquid crystal or seal compared to a structure in which the TFT is disposed on the upper surface of the second substrate and the color filter is disposed on the lower surface of the third substrate. Process stability is high because it can solve the applied problems. In addition, the align key formation process can be simplified.

In this case, the display panel according to the present embodiment may further include a first liquid crystal layer disposed between the first substrate and the second substrate and a second liquid crystal layer disposed between the second substrate and the third substrate. When the first liquid crystal layer and the second liquid crystal layer are included, a liquid crystal display panel may be obtained.

Meanwhile, the first protective layer, the polarization layer, the second protective layer, and the alignment layer may be sequentially disposed on the upper surface of the second substrate. The color filter and the polarization layer may be protected through the first and second protective layers, and alignment of the liquid crystal layer disposed between the second and third substrates may be controlled through the alignment layer.

Also, the number of pixels of the third substrate may be greater than the number of pixels of the first substrate. In the case of TFTs disposed on the third substrate, it can act as a switch to control RGB, and in the case of TFTs disposed on the first substrate, it can function as a light valve. Accordingly, the third substrate may have a resolution of, for example, 3840 × 2160, and the first substrate may have a resolution of, for example, 1920 × 1080.

A display panel according to another embodiment of the present invention for solving the above problems includes a first substrate, a first polarizing plate, a second substrate, a third substrate and a second polarizing plate. A TFT is disposed on the upper surface of the first substrate. A first polarizer is disposed under the first substrate. A second substrate is spaced apart from above the first substrate, a TFT is disposed on the upper surface, and a polarization layer is disposed on the lower surface. A third substrate is spaced apart from above the second substrate, and a color filter is disposed on a lower surface. A second polarizer is disposed on the third substrate.

The display panel according to the present embodiment also includes three substrates. Through this, it can contribute to thinning and lightening compared to a conventional display panel including four substrates.

In addition, in the display panel according to the present embodiment, a TFT is disposed on the upper surface of the second substrate and a color filter is disposed on the lower surface of the third substrate. In addition, a polarization layer is disposed on the lower surface of the second substrate on which TFTs are disposed on the upper surface. Such a polarization layer may be formed by coating and curing.

In this case, the display panel according to the present embodiment may further include a first liquid crystal layer disposed between the first substrate and the second substrate and a second liquid crystal layer disposed between the second substrate and the third substrate. When the first liquid crystal layer and the second liquid crystal layer are included, a liquid crystal display panel may be obtained.

In addition, the first protective layer, the polarization layer, the second protective layer and the alignment layer may be sequentially disposed on the lower surface of the second substrate. The base material of the second substrate and the polarization layer may be protected through the first protective layer and the second protective layer, and alignment of the liquid crystal layer disposed between the first and second substrates may be controlled through the alignment layer.

Also, the number of pixels of the second substrate may be greater than the number of pixels of the first substrate. Thus, in the case of TFTs disposed on the third substrate, it can act as a switch for controlling RGB, and in the case of TFTs disposed on the first substrate, it can act as a light valve.

A display device according to an embodiment of the present invention for solving the above problems includes a backlight unit and a display panel disposed above the backlight unit and outputting an image by receiving light from the backlight unit.

At this time, the display panel includes three substrates, TFTs are disposed on two substrates, color filters are disposed on one substrate, and a polarization layer is disposed on a central substrate.

In this way, by applying three substrates to the display panel, a display device that is thinner and lighter than a conventional display device to which a display panel including four substrates is applied can be provided.

At this time, the display panel includes a first substrate having TFTs disposed on an upper surface, a first polarizing plate disposed under the first substrate, and spaced apart from each other on the first substrate, and a color filter and a polarizing layer disposed on the upper surface. A second substrate, a first liquid crystal layer disposed between the first substrate and the second substrate, a third substrate spaced apart from each other on the second substrate and having TFTs disposed on the lower surface thereof, and the second substrate and a second liquid crystal layer disposed between the third substrate and a second polarizing plate disposed on the third substrate.

In the case of this example of the display panel, a reverse panel structure in which color filters are disposed on the upper surface of the second substrate and TFTs are disposed on the lower surface of the third substrate is included. Image output is also possible with this reverse panel structure, and the manufacturing process is easier than a structure in which a TFT is disposed on the upper surface of the second substrate and a color filter is disposed on the lower surface of the third substrate.

As another example, the display panel includes a first substrate having TFTs disposed on an upper surface, a first polarizing plate disposed under the first substrate, spaced apart from each other on the first substrate, and TFTs disposed on the upper surface, A second substrate having a polarization layer disposed on the lower surface, a first liquid crystal layer disposed between the first substrate and the second substrate, and a third liquid crystal layer disposed on the upper surface of the second substrate and having a color filter disposed on the lower surface. It may include a substrate, a second liquid crystal layer disposed between the second substrate and the third substrate, and a second polarizing plate disposed on the third substrate.

In the case of this example of the display panel, it can include only three substrates, so it can be lightweight and thin, and can be implemented by disposing a polarizing layer on the lower surface of the second substrate on which TFTs are disposed.

According to the present invention, using a display panel including three substrates, TFTs are disposed on two substrates, a color filter is disposed on one substrate, and a polarization layer is disposed on the central substrate, Compared to a display device to which a display panel including four substrates is applied, it is possible to provide a display device that is thinner and lighter.

In particular, in the case of an example in which a color filter and a polarizing layer are disposed on the upper surface of the second substrate and a TFT is implemented on the lower surface of the third substrate, process stability in the process of forming the polarizing layer and the alignment film and simplification of the align key forming process are added. effect can be obtained.

1 schematically shows a display panel including two substrates.
2 schematically shows a conventional display panel including four substrates.
FIG. 3 schematically illustrates a display device including the display panel shown in FIG. 2 .
4 schematically illustrates a display panel according to an embodiment of the present invention.
FIG. 5 schematically illustrates a display device including the display panel shown in FIG. 4 .
6 schematically illustrates a display panel according to another embodiment of the present invention.
FIG. 7 schematically illustrates a display device including the display panel shown in FIG. 6 .
8 shows an example of an align key applicable to the present invention.
9 shows another example of an align key applicable to the present invention.

Hereinafter, various embodiments of a display panel and a display device including the display panel according to the present invention will be described with reference to the drawings.

Hereinafter, terms including ordinal numbers, such as first and second, may be used to describe various elements, but the elements are not limited by these terms. These terms are only used to distinguish one component from another.

In addition, in the present invention, "on" means not only "a part is in contact with another part and is directly above", but also "a part is not in contact with another part or a third part It may also mean "on top of other parts in a state further formed in the middle.

4 schematically illustrates a display panel according to an embodiment of the present invention. FIG. 5 schematically illustrates a display device including the display panel shown in FIG. 4 .

Referring to FIG. 4 , the illustrated display panel includes a first substrate 410 , a second substrate 430 , a third substrate 450 , a first polarizing plate 470 and a second polarizing plate 480 .

Also, referring to FIG. 5 , the display device shown includes a display panel 510 including the above elements to display an image, and a backlight unit 520 to supply light to the display panel 510 .

The substrates 410, 430, and 450 may be glass substrates, but are not limited thereto and may be substrates made of other materials, such as, for example, polymer substrates applicable to display panels.

A TFT is disposed on the upper surface of the first substrate 410 . In addition, a pad electrode ( 415 in FIG. 5 ) for driving a TFT is disposed on the upper surface of the first substrate 410 .

The second substrate 430 is spaced apart from each other by spacers 416 on top of the first substrate 410, and TFTs are disposed on the upper surface. In addition, a pad electrode ( 425 in FIG. 5 ) for driving a TFT is disposed on the upper surface of the second substrate 430 . A polarization layer 435 is disposed on the lower surface of the second substrate 430 .

The third substrate 450 is spaced apart from each other by a spacer 426 on the second substrate 430, and a color filter is disposed on the lower surface.

The first polarizer 470 is disposed below the first substrate 410 , and the second polarizer 480 is disposed above the third substrate 450 . The first polarizer 470 and the second polarizer 480 include polyvinyl alcohol (PVA) films. In addition, the first polarizing plate 470 and the second polarizing plate 480 may have a structure in which base films made of, for example, triacetyl cellulose (TAC), acrylic, or polyethylene terephthalate (PET) are disposed on one side or both sides of the PVA film. can

In the case of the display panel according to the present embodiment, three substrates 410, 430, and 450 are included. Through this, it can contribute to thinning and lightening compared to a conventional display panel including four substrates.

In the display panel according to the present embodiment, a TFT is disposed on the upper surface of the second substrate 430 and a color filter is disposed on the lower surface of the third substrate 450 . In addition, a polarization layer 435 is disposed on the lower surface of the second substrate 430 on which TFTs are disposed on the upper surface.

The polarization layer 435 may be formed of, for example, a dichroic dye having a relatively high ratio of dichroism to smectic RM. Here, Smectic RM is a material containing a terminal group such as acrylate, which can be polymerized with mesogen capable of expressing liquid crystal, and can be polymerized by ultraviolet (UV) light. In addition, the dichroic dye has a different absorption ratio depending on the direction of incident light, and may be an azo compound. The polarization layer 435 may be formed by coating and curing a composition including smectic RM and a dichroic dye.

The display panel according to the present embodiment includes a first liquid crystal layer 417 disposed between a first substrate 410 and a second substrate 430 and disposed between a second substrate 430 and a third substrate 450. A second liquid crystal layer 427 may be further included. When the first liquid crystal layer 417 and the second liquid crystal layer 427 are included, a liquid crystal display panel may be obtained. For liquid crystal alignment for forming the first liquid crystal layer 417, polyimide alignment layers 412 and 436 are formed on the upper surface of the first substrate 410 and on the lower surface of the second substrate 430, for example. can be placed. In addition, for liquid crystal alignment for forming the second liquid crystal layer 427, polyimide alignment layers 431 and 452 are formed on the upper surface of the second substrate 430 and on the lower surface of the third substrate 450, for example. ) can be placed.

In addition, a first protective layer 432, a polarization layer 435, a second protective layer 434, and an alignment layer 436 may be sequentially disposed on the lower surface of the second substrate. The second substrate 430 and the polarization layer 435 may be protected through the first protective layer 432 and the second protective layer 434, and the first substrate 410 and the second substrate 410 may be protected through the alignment layer 435. Alignment of liquid crystal disposed between the two substrates 430 may be controlled.

Also, the number of pixels of the second substrate 430 may be greater than the number of pixels of the first substrate 410 . In terms of pixel size, the pixel size of the first substrate 410 adjacent to the backlight unit may be larger than that of the second substrate 430 . Accordingly, the TFT disposed on the second substrate 430 can act as a switch for controlling RGB, and the TFT disposed on the first substrate 410 can function as a light valve.

6 schematically illustrates a display panel according to another embodiment of the present invention. FIG. 7 schematically illustrates a display device including the display panel shown in FIG. 6 .

Referring to FIG. 6 , the illustrated display panel includes a first substrate 610, a second substrate 630 on which a polarization layer 635 is disposed, a third substrate 650, a first polarizer 670, and a second polarizer. (680).

And, referring to FIG. 7 , the illustrated display device includes a first substrate 610, a second substrate 630, a third substrate 650, a first polarizing plate 670 and a second polarizing plate 680. It includes a display panel 710 that displays an image and a backlight unit 720 that provides light to the display panel 710 .

A thin film transistor (TFT) is disposed on the upper surface of the first substrate 610 . In addition, a pad electrode ( 615 in FIG. 7 ) for driving a TFT is disposed on the upper surface of the first substrate 610 .

The second substrate 630 is spaced apart from the first substrate 610 by a spacer 616, and a color filter is disposed on the upper surface. A polarization layer 635 is disposed on the second substrate 630, more specifically, on the upper surface of the color filter of the second substrate.

The third substrate 650 is spaced apart from each other by spacers 626 on the second substrate 630, and TFTs are disposed on the lower surface. In addition, a pad electrode ( 625 in FIG. 7 ) for driving a TFT is disposed on the lower surface of the third substrate 650 .

The first polarizer 670 is disposed below the first substrate, and the second polarizer 680 is disposed above the third substrate 650 . The first polarizer 670 and the second polarizer 680 include polyvinyl alcohol (PVA) films. In addition, the first polarizing plate 670 and the second polarizing plate 680 may have a structure in which base films made of, for example, triacetyl cellulose (TAC), acrylic, or polyethylene terephthalate (PET) are disposed on one side or both sides of the PVA film. can

Even in the case of the display panel according to the present embodiment, only three substrates 610, 630, and 650 may be included. Through this, for example, since one substrate is less required than a display panel including four substrates as shown in FIG. 2 , it can contribute to thinning and lightening.

In addition, the display panel according to the present embodiment includes a reverse panel structure in which color filters are disposed on the upper surface of the second substrate 630 and TFTs are disposed on the lower surface of the third substrate 650 . Even with this reverse panel structure, image output is possible.

At this time, in the case of the display panel according to the present embodiment, the polarization layer 635 is disposed on the color filter of the second substrate 430 . The polarization layer 635 may be formed of, for example, a dichroic dye having a relatively high dichroic ratio to smectic RM. The polarization layer 635 may be formed by coating and curing a composition including smectic RM and a dichroic dye.

More specifically, on the upper surface of the second substrate 630, for example, a first protective layer 632 made of polyimide, a polarization layer 635, an organic or inorganic second protective layer 636, and a polyimide material are aligned. Layers 637 may be arranged sequentially. The color filter and the polarization layer may be protected through the first protective layer 632 and the second protective layer 636, and the liquid crystal disposed between the second substrate 630 and the third substrate 650 through the alignment layer. The orientation of the layers can be controlled.

In this way, when the polarization layer is disposed on the color filter of the second substrate 630, it is possible to solve the problem of damage to the liquid crystal or seal, thereby increasing process stability. That is, in the example shown in FIG. 4, after bonding the second substrate 430 and the third substrate 450 and injecting liquid crystal, the lower surface of the second substrate (430 in FIG. 4) having TFTs disposed on the upper surface. A polarization layer (435 in FIG. 4) is formed. In this case, damage may be applied to the liquid crystal or seal. However, in the case of the example shown in FIG. 6, the polarization layer 635 is first formed on the top surface of the color filter of the second substrate 630, and the second substrate 630 and the third substrate 650 are bonded. Bar, the possibility of damage being applied to the liquid crystal or thread is reduced.

In addition, when the polarization layer is disposed on the color filter, the align key formation process can be simplified by using laser patterning or inkjet printing. That is, after bonding the second substrate 630 and the third substrate 650, the first substrate 610 needs to be bonded. At this time, since a key for bonding does not exist on the rear surface of the second substrate 630, the key have to form When such key formation is applied to a photo process, the process process is complicated, and seal damage and bursting may occur during metal deposition in a vacuum atmosphere. However, in the case of a key formation process using laser patterning or inkjet printing, the align key formation process can be simplified in that it does not go through a complicated process.

8 shows an example of an align key applicable to the present invention. Referring to FIG. 8 , the second substrate and the third substrate may be aligned by an align key 910 disposed on a lower surface of the third substrate and an align key 920 disposed on an upper surface of the second substrate. Then, in a state where the second substrate and the third substrate are bonded, using a new align key 930 disposed on the top surface of the first substrate by using laser patterning or inkjet printing and the existing align keys 910, 920 , the second substrate and the third substrate bonded to the first substrate may be aligned.

10 shows another example of an align key applicable to the present invention. Unlike the example shown in FIG. 9 , a new align key 940 disposed on the lower surface of the second substrate using laser patterning or inkjet printing in a state in which the second and third substrates are bonded together and the upper surface of the first substrate The second substrate and the third substrate bonded to the first substrate may be aligned using the newly disposed align key 930 . A new align key 940 disposed on the lower surface of the second substrate in a state where the second substrate and the third substrate are bonded may have a shape that covers the existing align keys 910 and 920 .

At this time, the display panel according to the present embodiment has a first liquid crystal layer 617 disposed between the first substrate 610 and the second substrate 630 and between the second substrate 630 and the third substrate 627. A second liquid crystal layer 627 may be further included. When the first liquid crystal layer 617 and the second liquid crystal layer 627 are included, a liquid crystal display panel may be obtained. For liquid crystal alignment for forming the first liquid crystal layer 617, polyimide alignment layers 612 and 636 are formed on the upper surface of the first substrate 610 and on the lower surface of the second substrate 630, for example. can be placed. In addition, for liquid crystal alignment for forming the second liquid crystal layer 627, polyimide alignment layers 637 and 652 are formed on the upper surface of the second substrate 630 and on the lower surface of the third substrate 650, for example. ) can be placed.

Meanwhile, the number of pixels defined by the TFTs of the third substrate 650 may be greater than the number of pixels defined by the TFTs of the first substrate 610 . In terms of pixel size, the pixel size of the first substrate 610 adjacent to the backlight unit may be larger than that of the third substrate 650 . The TFT disposed on the third substrate 650 can act as a switch for controlling RGB, and the TFT disposed on the first substrate 610 can function as a light valve. Accordingly, the third substrate 650 may have a resolution of, for example, 3840 × 2160, and the first substrate 610 may have a resolution of, for example, 1920 × 1080.

As described above, according to the present invention, a display panel including three substrates, TFTs are disposed on two substrates, color filters are disposed on one substrate, and a polarization layer is disposed on a central substrate. By using the present invention, it is possible to provide a display device that is thinner and lighter than a conventional display device to which a display panel including four substrates is applied.

In particular, in the case of the structure shown in FIG. 6 in which a color filter and a polarizing layer are disposed on the upper surface of the second substrate and a TFT is implemented on the lower surface of the third substrate, process stability and alignment key in the process of forming the polarizing layer and the alignment film Additional effects such as simplification of the forming process can be obtained.

Although the above has been described based on the embodiments of the present invention, various changes or modifications may be made at the level of those skilled in the art. Accordingly, it will be understood that such changes and modifications are included within the scope of the present invention as long as they do not depart from the scope of the present invention.

110: first substrate 120: second substrate
130a: upper polarizer 130b: lower polarizer
210: first panel portion 211: first substrate
212: second substrate 220: second panel portion
230: bonding unit 213: first polarizing plate
215, 225: pad electrode 221: third substrate
222: fourth substrate 223: second polarizing plate
224: third polarizer 301: display panel
302: backlight unit 216, 226: spacer
217, 227: liquid crystal
410: first substrate 412, 431, 436, 452: alignment layer
415, 425: pad electrode 416, 426: spacer
417: first liquid crystal layer 427: second liquid crystal layer
430: second substrate 432: first protective layer
434: second protective layer 435: polarization layer
450: third substrate 470: first polarizer
480: second polarizer 510: display panel
520: backlight unit
610: first substrate 612, 636, 637, 652: alignment layer
615, 625: pad electrode 616, 626: spacer
617: first liquid crystal layer 627: second liquid crystal layer
630: second substrate 632: first protective layer
635: polarization layer 636: second protective layer
650: third substrate 670: first polarizer
680: second polarizer 710: display panel
720: backlight unit

Claims (13)

A first substrate on which a TFT (Thin Film Transistor) is disposed;
a first polarizer disposed under the first substrate;
a second substrate spaced apart from the first substrate;
a color filter disposed on an upper surface of the second substrate and a polarization layer disposed on the color filter;
a third substrate spaced apart from above the second substrate and having a TFT disposed on a lower surface thereof; and
A display panel comprising a second polarizer disposed on the third substrate.
According to claim 1,
a first liquid crystal layer disposed between the first substrate and the second substrate; and
Further comprising a second liquid crystal layer disposed between the second substrate and the third substrate, the display panel.
According to claim 1,
A display panel comprising a first protective layer, a polarization layer, a second protective layer, and an alignment layer sequentially disposed on an upper surface of the second substrate.
According to claim 1,
The display panel, wherein the number of pixels of the third substrate is greater than the number of pixels of the first substrate.
delete delete delete delete backlight unit; and
A display panel disposed above the backlight unit and outputting an image by receiving light from the backlight unit;
The display panel includes three substrates,
The three substrates may include a first substrate having a TFT disposed on an upper surface, a first polarizing plate disposed under the first substrate, and a second substrate disposed spaced apart from each other above the first substrate; A color filter disposed on the upper surface of the second substrate and a polarizing layer disposed on the color filter, a first liquid crystal layer disposed between the first substrate and the second substrate, and disposed spaced apart from each other on the second substrate , A display device comprising a third substrate having TFTs disposed on a lower surface, a second liquid crystal layer disposed between the second substrate and the third substrate, and a second polarizing plate disposed on the third substrate.
According to claim 9,
A pixel size of the first substrate disposed adjacent to the backlight unit is larger than a pixel size of the second substrate.
delete delete According to claim 1,
a first align key disposed on a lower surface of the third substrate;
a second align key disposed on an upper surface of the second substrate and aligned with the first align key; and
and a third align key disposed on an upper surface of the first substrate and aligned with the aligned first and second align keys.

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