KR100671160B1 - Transflective LCD and the fabrication method - Google Patents

Abstract

The present invention relates to a transflective liquid crystal display device and a manufacturing method thereof, and more particularly, to a transflective liquid crystal display device and a method of manufacturing the same that can improve light efficiency.

The present invention provides a transflective liquid crystal display device having a dual cell gap having good visibility and no additional process by forming a transmissive part in red, blue, and green color subpixels, and forming a white subpixel having high light efficiency as a reflecting part.

In addition, the present invention has the advantage that the process is simplified by simultaneously forming a cell gap compensation pattern on the reflecting portion when forming the column spacer.

White pixel, transflective, dual cell gap, compensation pattern

Description

Transflective LCD and the fabrication method

1 is a cross-sectional view schematically showing the structure of a transmissive liquid crystal display device according to the related art.

2 is a cross-sectional view schematically showing the structure of a conventional reflective liquid crystal display device;

3 is a cross-sectional view schematically showing a configuration of a conventional transflective liquid crystal display device.

4 is a plan view showing a part of a transflective liquid crystal display device according to the present invention;

FIG. 5 is a cross-sectional view of a part of a reflecting unit and a transmitting unit in the transflective liquid crystal display according to the present invention; FIG.

<Description of Signs of Major Parts of Drawings>

400: first substrate 401: second substrate

402: gate wiring 403: data wiring

409: gate electrode 412: source electrode

413: drain electrode 420: semiconductor layer

421: First protective film 422: Second protective film

433: pixel electrode 435: reflective electrode

441: black matrix 443: color filters

445 common electrode 447 overcoat layer

451 column spacer 453 cell gap compensation pattern

460: liquid crystal layer 470: backlight unit

472, 476: upper and lower polarizing plates 474, 475: upper and lower retardation plates

The present invention relates to a transflective liquid crystal display device and a manufacturing method thereof, and more particularly, to a transflective liquid crystal display device and a method of manufacturing the same that can improve light efficiency.

In general, the liquid crystal display is a flat panel display having advantages of small size, thinness, and low power consumption, and is used as a portable computer such as a notebook PC, office automation equipment, and audio / video equipment.

Such a liquid crystal display device displays an image or an image by controlling an electric field applied to a liquid crystal material having dielectric anisotropy to transmit or block light. Liquid crystal display devices, unlike display elements that emit light by themselves, such as electro-luminescence (EL), cathode ray tube (CRT), and light emitting diode (LED), emit light by themselves. It does not occur and uses external light.

In general, liquid crystal displays are roughly classified into a transmissive type and a reflective type according to a method of using light.

The transmissive liquid crystal display device includes a liquid crystal display panel in which a liquid crystal material is injected between two glass substrates, and a backlight for supplying light to the liquid crystal display panel.

1 is a view schematically showing the structure of a transmissive liquid crystal display according to the related art. As shown therein, a lower plate 102 having TFTs (Thin Film Transistors (TFTs)), each functioning as a switching element, is formed at the intersection of the gate bus line and the data bus line; An upper plate 101 facing the lower plate 102 and including a black matrix (BM), a color filter layer, and a common electrode; A liquid crystal layer 103 into which liquid crystal is injected between the lower plate 102 and the upper plate 101; And a first polarizing plate 105 attached to the lower plate 102, a second polarizing plate 104 attached to the upper plate 101, and a backlight assembly 106 that emits light to provide a light source. .

Here, the first polarizing plate and the second polarizing plate respectively attached to the upper plate and the lower plate are attached to each other at 90 °.

When one gate bus line and one data bus line of the liquid crystal display device configured as described above are selected and a voltage is applied, only a thin film transistor (TFT) to which the voltage is applied is turned on, and the on Charge is accumulated in the pixel electrode connected to the drain electrode of the TFT to change the angle of the liquid crystal molecules between the common electrode and the common electrode.

Therefore, an image or an image is displayed by controlling an electric field applied to liquid crystal molecules having dielectric anisotropy of the liquid crystal layer 103 to transmit or block light provided from the backlight assembly 106.

However, the transmissive liquid crystal display device has difficulty in reducing thickness and weight due to the volume and weight of the backlight assembly, and the excessive power consumption of the backlight assembly is pointed out as a disadvantage.

Accordingly, research and development of a reflective liquid crystal display device that does not use the backlight assembly has been in progress.

On the other hand, since the reflection type liquid crystal display device does not have its own light source, it displays an image depending on natural light (or ambient light). Therefore, since a separate backlight assembly is not required, power consumption is low, so it is widely used as a portable display device such as an electronic notebook or a personal information terminal.

2 is a view schematically showing a structure of a conventional reflective liquid crystal display device. As shown therein, a lower plate 202 having a thin film transistor (TFT), each functioning as a switching element, formed at the intersection of the gate bus line and the data bus line; An upper plate 201 opposed to the lower plate 202 and formed with a black matrix (BM), a color filter layer, and a common electrode; A liquid crystal layer 203 into which liquid crystal is injected between the lower plate 202 and the upper plate 201; A first polarizing plate 205 attached to the lower plate 202, a second polarizing plate 204 attached to the upper plate 201, and a lower portion of the first polarizing plate 205 and provided from an external light source. And a reflecting plate 206 for reflecting light.

When one of the gate bus line and the data bus line of the liquid crystal display device configured as described above is selected and a voltage is applied, only a thin film transistor (TFT) to which the voltage is applied is turned on, and the on Charges are accumulated in the pixel electrode connected to the drain electrode of the TFT to change the angle of the liquid crystal molecules between the common electrode and the common electrode.

Accordingly, an image or an image is displayed by controlling an electric field applied to liquid crystal molecules having dielectric anisotropy of the liquid crystal layer 203 to transmit or block external light reflected from the reflecting plate.

However, the reflective liquid crystal display device has a problem in that when the natural light does not have a sufficient amount of light (for example, when the surroundings are dark), the luminance level of the display image is lowered and the displayed information cannot be read.

3 is a cross-sectional view schematically illustrating a configuration of a conventional transflective liquid crystal display device. As shown in the drawing, the upper plate 311 on which the color filter substrate is formed and the lower plate 332 which is an array substrate face each other at a predetermined interval, and the liquid crystal layer 320 is disposed between the upper plate and the lower plate 311 and 332. The backlight assembly 340 is filled at the bottom of the lower plate 332 to supply light.

An upper polarizing plate which converts natural light into linearly polarized light by passing only light in a direction parallel to a light transmission axis outside the upper plate and the lower plate 311 and 332, that is, the upper surface of the upper plate 311 and the lower plate 332. 313 and a lower polarizer 336 are disposed. Here, the light transmission axis of the upper polarizing plate 313 forms 90 degrees with the light transmission axis of the lower polarizing plate 336.

The upper plate 311 includes a color filter (not shown) for transmitting only light of a specific wavelength band and an upper common electrode 312 which is one electrode for applying a voltage to the liquid crystal.

In the lower plate 332, a lower pixel electrode 333, which is the other electrode for applying a voltage to the liquid crystal layer 320, and an upper portion of the lower pixel electrode 333, are located in a portion of the lower pixel electrode 333. The protective layer 334 and the reflecting plate 335 having the transmission hole 331 exposing the light are sequentially formed.

In this case, an area corresponding to the reflective plate 335 is referred to as the reflection part r, and an area corresponding to the pixel electrode 333 exposed by the transmission hole 331 is defined as the transmission part t.

On the other hand, the cell gap of each of the reflector r and the transmissive part t is about twice the value of the transmissive cell gap d1 of the reflector cell gap d2 in order to reduce the distance difference between the two regions. It is configured to have.

Because the phase difference value δ of the liquid crystal layer 320 is

δ = Δnd

(δ: retardation value of liquid crystal, Δn: refractive index of liquid crystal, d: cell gap)

In order to reduce the difference in light efficiency between the reflection mode using light reflection and the transmission mode using light transmission, the cell gap of the transmission part is larger than the cell gap of the reflection part so that the phase difference value of the liquid crystal layer 320 is constant. Because you have to keep.

However, even if the cell gap of the liquid crystal layer is different between the two modes, there is a problem that the light efficiency of the reflection mode and the transmission mode of the transflective liquid crystal display device is different.

In particular, when driving the reflection mode and the transmission mode by forming both the reflection part and the transmission part in one pixel, there is a problem in that visibility is reduced in bright external light conditions.

The present invention provides a semi-transmissive liquid crystal display having a dual cell gap, which is easy to see and has no additional process, by forming a transmissive portion in red, blue, and green color subpixels, and forming a white subpixel having high light efficiency as a reflecting portion in a transflective liquid crystal display device. It is an object to provide a display device and a method of manufacturing the same.

In order to achieve the above object, an embodiment of the transflective liquid crystal display according to the present invention includes a white subpixel W defined as a reflector and a reflecting electrode formed in the entire pixel region, and a transmissive portion defined in the entire pixel region. A first substrate having red, green, and blue subpixels (R, G, B) on which transparent pixel electrodes are formed; A second substrate facing the first substrate; A liquid crystal layer formed between the first substrate and the second substrate; Polarizing plates formed outside the first and second substrates; And a phase difference plate formed between the first and second substrates and the polarizing plate.
A reflective electrode is formed on the white subpixel, and a transparent pixel electrode is formed on the red, green, and blue subpixels.

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A column spacer may be further formed between the first and second substrates.

The reflector may further include a cell gap compensation pattern.

A color filter is formed in the transmissive portion of the second substrate.

The liquid crystal cell gap of the transmissive part is about twice that of the liquid crystal cell gap of the reflecting part.

The liquid crystal phase retardation value of the transmission part is λ / 2, and the liquid crystal phase retardation value of the reflection part is λ / 4.

In addition, another embodiment of the transflective liquid crystal display according to the present invention in order to achieve the above object, a plurality of white sub-pixel (W) defined as a reflecting portion and a plurality of red, green, blue sub-pixels defined as a transmissive portion A first substrate and a second substrate made of (R, G, B); A reflective electrode formed on the entire white subpixel on the first substrate; A transparent pixel electrode formed on each of the red, green, and blue subpixels on the first substrate; A red, green, and blue color filter formed in the transmission portion of the second substrate; A cell gap compensation pattern formed on a reflecting portion of the second substrate; A liquid crystal layer formed between the first substrate and the second substrate; And a column spacer between the first and second substrates.
Polarizing plates formed outside the first and second substrates; And a phase difference plate formed between the first and second substrates and the polarizing plate.

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In addition, in order to achieve the above object, a method of manufacturing a transflective liquid crystal display device according to the present invention includes a plurality of white subpixels W defined by a reflecting unit and a plurality of red, green and blue subpixels defined by a transmissive unit. Preparing a first substrate and a second substrate composed of (R, G, B); Forming a thin film transistor on each of the plurality of white, red, green, and blue subpixels; Reflective electrodes connected to the thin film transistors in the entire pixel region of the white subpixel W, and transparent pixels connected to the thin film transistors in the entire pixel region of the red, green, and blue subpixels R, G, and B. Forming an electrode; Forming a black matrix and a color filter corresponding to the red, green, and blue subpixels on the second substrate; Forming a liquid crystal layer between the first and second substrates.
And forming a cell gap compensation pattern corresponding to the column spacer and the white subpixel on the second substrate.

Forming a thin film transistor on the first substrate, forming a gate electrode on the substrate; Forming a semiconductor layer on the gate electrode with a gate insulating film interposed therebetween; And forming a source electrode and a drain electrode at predetermined intervals on both sides of the semiconductor layer.

The cell gap compensation pattern and the column spacer may be made of the same material.

The cell gap compensation pattern may be formed such that the liquid crystal cell gap of the white subpixel is 1/2 of the liquid crystal cell gap of the red, green, and blue subpixels.

Hereinafter, the transflective liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a plan view illustrating a part of a transflective liquid crystal display according to the present invention.

Referring to FIG. 4, the transflective liquid crystal display according to the present invention includes a color subpixel such as a red subpixel R, a green subpixel G, and a blue subpixel B and a white subpixel W. FIG. Doing.

The red, green, and blue subpixels R, G, and B form a transmissive portion, and the white subpixel W forms a blocking portion.

A detailed configuration of the color subpixel and the white subpixel will be described. A plurality of gate wires 402 are arranged on the substrate in a lateral direction and intersect the gate wires 402 with a plurality of data wires in a longitudinal direction. 403 is arranged.

The gate line 402 and the data line 403 are arranged in a matrix to define a plurality of pixel areas.

A pixel electrode 433 is formed in the pixel region, whereas a pixel electrode 433 made of a transparent conductive electrode is formed in the color subpixels R, G, and B, while the white subpixel W is formed. The reflective electrode 435 made of a metal material having excellent reflectance is formed and also serves as a pixel electrode.

A thin film transistor TFT is formed at the intersection of the gate line 402 and the data line 403 to adjust the voltage applied to the pixel electrode 433.

The thin film transistor may include a gate electrode 409 to which a scan signal is applied, a semiconductor layer 420 that is activated in response to the scan signal to form a channel, and electrically connects the semiconductor layer 420 and the gate electrode 409 to each other. A gate insulating layer (not shown) to isolate the semiconductor layer, a source electrode 412 formed on the semiconductor layer 420, to which a data signal is input, and to the source electrode 412 as the semiconductor layer 420 is activated. And a drain electrode 413 that applies the input data signal to the pixel electrode 433.

When the transflective liquid crystal display device configured as described above is operated in the reflective mode, the light reflected by the reflective electrode 435 formed in the white sub-pixel W as a reflector passes through the liquid crystal layer, and in the transmissive mode. In operation, the light of the backlight passes through the liquid crystal layer by the transparent pixel electrodes 433 formed in the red, green, and blue subpixels R, G, and B, which are transmissive portions, to display an image.

Although not shown, the red, green, and blue subpixels R, G, and B have red, green, and blue color filters formed on opposite substrates, and the substrates facing the white subpixels W, respectively. No color filter is formed.

5 is a cross-sectional view of a part of a reflective part and a transmissive part in the transflective liquid crystal display according to the present invention.

Here, the transflective liquid crystal display according to the present invention has been described by applying the ECB mode, but is not limited thereto and may be applied to the TN mode, the IPS mode, and the VA mode liquid crystal display.

The reflective part of the transflective liquid crystal display device is a red, green, and blue subpixel, and the transmissive part is formed of a white subpixel.

As shown in FIG. 5, in the transflective liquid crystal display according to the present invention, the first substrate 400 and the second substrate 401 are formed to face each other and adhere to each other, and the reflective electrode is disposed on the first substrate 400. 435 and the upper and lower retardation plates 474 and 476 attached to the outside of the first and second substrates 400 and 401, and the lower and lower polarizers 472 and 476, and the lower polarizer 472. The formed backlight unit 470 is provided.

More specifically, the second substrate 401 includes a black matrix 441, a color filter 443, and a common electrode 445 formed on the substrate.

However, when the transflective liquid crystal display according to the present invention is applied to the transverse electric field mode (IPS), the common electrode 445 is provided on the first substrate.

The black matrix 441 is formed to overlap with areas other than the display area, thereby preventing light leakage and absorbing external light to increase contrast.

The color filter 443 is formed in a region separated by the black matrix 441 from the red, green, and blue subpixels R, G, and B, and selectively transmits light having a specific wavelength, Implements green and blue colors.

However, the color filter 443 is not formed in the white subpixel W.

The common electrode 445 is supplied with a common voltage for controlling the movement of the liquid crystal.

In addition, an overcoat layer 447 is formed on the entire surface of the black matrix 441 and the color filter 443, and a common electrode 445 is formed on the overcoat layer 447.

A column spacer 451 is formed between the first substrate and the second substrate to maintain a constant cell gap on the common electrode.

The cell gap compensation pattern is formed on the white subpixel W using the same material as that of the column spacer forming material.

The first substrate 400 includes a thin film transistor (not shown), a reflective electrode 435, a pixel electrode 433, and a lower alignment layer (not shown) formed on the substrate.

The thin film transistor is formed at an intersection of the gate line 402 and the data line 403 to reflect the data signal from the data line 403 and the pixel electrode 433 in response to a scan signal from the gate line 402. It is supplied to the electrode 435.

The data line 403 is formed on the first substrate 400, the first passivation layer 421 is formed, and the reflective electrode 435 is formed in the pixel area of the white subpixel W. The pixel electrode 433 is formed on the second passivation layer 422 in the pixel region of the red subpixel R.

A liquid crystal layer 460 is formed between the first substrate 400 and the second substrate 401, and the liquid crystal layer 460 is formed with respect to the first substrate 400 and the second substrate 401. An electrically controlled birefringence (ECB) mode is used which is oriented in parallel and moves in parallel with the direction of the electric field when an electric field is applied.

In addition, a pixel electrode 433 is formed in the red subpixel R, and a reflective electrode 435 is formed in the white subpixel W.

The red, green, and blue subpixels R, G, and B are formed with a pixel electrode 433 made of a transparent conductive electrode to form a transmissive portion, and the backlight unit 470 is sent to a display area corresponding to the transmissive portion. Generate light.

The transparent conductive electrode uses a material selected from indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO).

The upper and lower retardation plates 474 and 475 may include a first substrate 400 to compensate for a phase difference phenomenon in which the degree of polarization of the liquid crystal varies depending on the viewing angle due to birefringence in which the long-axis refractive index and the short-axis refractive index of the liquid crystal are different from each other. And formed outside of the second substrate 401.

In the transflective liquid crystal display device configured as described above, the red, green, and blue subpixels R, G, and B are used as the transmissive portion, and the white subpixel W is used as the reflective portion, so that the color filter 443 is used in the transmissive mode. When the color image is implemented, and the backlight unit 470 is turned off in the reflection mode, only the white subpixel W is driven, thereby displaying a monochrome image.

Therefore, all of the color subpixels R, G, and B are designed as transmissive parts, and thus operate in a transmissive mode in a dark environment, and the backlight unit 470 is turned on to have good image quality and good visibility.

In addition, there is an effect that visibility is improved when operating in the transflective mode.

Meanwhile, in the transflective liquid crystal display, the reflective electrode 435 and the second substrate 401 maintain the first cell gap d1 at the reflecting portion of the first substrate 400, and In the transmissive portion, the pixel electrode 433 and the second substrate 401 hold the second cell gap d2, which is about twice the first cell gap d1.

Accordingly, red, green, and blue color filters are formed on the second substrate 401 in the red, green, and blue subpixels R, G, and B. In the white sub-package W, the color filters 443 are formed. ), The cell gap compensation pattern is formed using the column spacer forming material to compensate for the cell gap.

The thickness of the cell gap compensation pattern is such that the pixel electrode 433 and the second substrate 401 may maintain a second cell gap d2 that is about twice the first cell gap d1 in the transmission portion of the first substrate 400. Form.

The operation of the transflective liquid crystal display having the configuration as described above is as follows.

In the transmissive mode, the backlight unit 470 under the first substrate 400 is turned on so that the light from the backlight unit passes through the transparent first substrate 400.

In this case, the light passing through the first substrate 400 may be classified into light incident to the transmission part and light incident to the reflection part.

The transmissive part is a red, green, and blue subpixel (R, G, B), and the reflecting part is formed of a white subpixel (W).

A pixel electrode 433 is formed in the transmissive part, and the pixel electrode 433 is made of a transparent conductive electrode material. In addition, a reflective electrode 435 is formed in the transmission part.

Accordingly, light passes through the transmission part of the first substrate 400 and then passes through the liquid crystal layer 460 to enter the color filter 443 formed on the second substrate 401 to display a color having a predetermined luminance.

On the other hand, a reflective electrode 435 is formed in the reflective part to serve as a pixel electrode. Since the reflective electrode 435 is formed of a metal having excellent reflectivity, the light of the backlight unit 470 incident to the reflective part is reflected by the reflective electrode. Reflected at 435, it is impossible to enter the second substrate 401.

Therefore, in the transmissive mode, light passes through only the transmissive portion, that is, the red, green, and blue subpixels, and enters the color filter 443 with the liquid crystal layer 460 corresponding to twice the reflection area, thereby displaying a color image. do.

In this case, the phase retardation of the liquid crystal layer 460 of the transmission part is about λ / 2.

In the reflective mode, the backlight unit 470 of the lower portion of the first substrate 400 is turned off, so that light by the backlight unit 470 does not enter the inside of the first substrate 400.

Since the reflection mode is mainly used when there is a light source externally, the light by the light source is incident into the liquid crystal display through the second substrate 401.

Therefore, the light by the external light source passing through the second substrate 401 is reflected by the reflective electrode 435 formed in the reflecting portion of the first substrate 400 after passing through the liquid crystal layer 460 and again the color filter. It enters (443).

Since the light is reflected by the reflective electrode, the length of the light path in the liquid crystal layer is about twice that of the light path in the transmissive mode.

Accordingly, in the transflective liquid crystal display, the reflective electrode and the second substrate maintain the first cell gap d1 in the reflecting portion, and the pixel electrode and the second substrate have about twice the first cell gap d1 in the transmissive portion. It is formed in two cell gaps d2.

At this time, the phase retardation of the liquid crystal layer in the reflector is about λ / 4.

In the above embodiment, an ECB mode liquid crystal is used, but the present invention is not limited thereto, and a TN or IPS mode in which the liquid crystal is horizontally aligned, or a VA mode liquid crystal in which the liquid crystal is vertically aligned may be used.

Although the present invention has been described in detail with reference to specific examples, it is intended to describe the present invention in detail, and the transflective liquid crystal display and the manufacturing method thereof according to the present invention are not limited thereto, and within the technical spirit of the present invention. It is apparent that modifications and improvements are possible by those skilled in the art.

According to the present invention, in the transflective liquid crystal display, red, green, and blue sub-pixels (R, G, B) and transmissive portions are formed of white sub-pixels (W), so that visibility can be ensured even in bright external light conditions, thereby providing excellent light efficiency. It works.

In addition, the present invention has the effect of simplifying the process by forming a cell gap compensation pattern at the same time in the reflective portion when forming the column spacer.

Claims (17)

A white subpixel (W) defined as a reflector and formed with a reflective electrode in the entire pixel region, and a red, green and blue subpixel (R, G, B) defined as a transmissive portion and in which a transparent pixel electrode is formed in the entire pixel region. 1 substrate; A second substrate facing the first substrate; A liquid crystal layer formed between the first substrate and the second substrate; Polarizing plates formed outside the first and second substrates; And a retardation plate formed between the first and second substrates and the polarizing plate. delete The method of claim 1, A semi-transmissive liquid crystal display device, further comprising column spacers formed between the first and second substrates. The method of claim 1, And a cell gap compensation pattern is formed in the reflecting unit. The method of claim 1, The transflective liquid crystal display of claim 1, wherein a red, green, and blue color filter is formed in the transmissive portion of the second substrate, and a transparent material is formed in the reflective portion of the second substrate. The method of claim 1, The liquid crystal cell gap of the transmissive part is almost twice the liquid crystal cell gap of the reflecting part. The method of claim 1, The liquid crystal phase retardation value of the transmissive part is λ / 2, and the liquid crystal phase retardation value of the reflecting part is λ / 4. A first substrate and a second substrate including a plurality of white subpixels W defined by a reflector and a plurality of red, green and blue subpixels R, G, and B defined by a transmissive part; A reflective electrode formed on the entire white subpixel on the first substrate; A transparent pixel electrode formed on each of the red, green, and blue subpixels on the first substrate; A red, green, and blue color filter formed in the transmission portion of the second substrate; A cell gap compensation pattern formed on a reflecting portion of the second substrate; A liquid crystal layer formed between the first substrate and the second substrate; And a column spacer between the first and second substrates. The method of claim 8, Polarizing plates formed outside the first and second substrates; And a phase difference plate formed between the first and second substrates and the polarizing plate. The method of claim 8, The liquid crystal cell gap of the transmissive part is almost twice the liquid crystal cell gap of the reflecting part. The method of claim 8, The liquid crystal phase retardation value of the transmissive part is λ / 2, and the liquid crystal phase retardation value of the reflecting part is λ / 4. Preparing a first substrate and a second substrate including a plurality of white subpixels W defined by a reflector and a plurality of red, green and blue subpixels R, G, and B defined by a transmissive part; Forming a thin film transistor on each of the plurality of white, red, green, and blue subpixels; Forming a reflective electrode connected to the thin film transistor in the entire pixel region of the white subpixel, and a transparent pixel electrode connected to the thin film transistor in the entire pixel region of the red, green and blue subpixels; Forming a black matrix and a color filter corresponding to the red, green, and blue subpixels on the second substrate; A method of manufacturing a transflective liquid crystal display device comprising forming a liquid crystal layer between the first and second substrates. The method of claim 12, In the forming of the thin film transistor on the first substrate, Forming a gate electrode on the substrate; Forming a semiconductor layer on the gate electrode with a gate insulating film interposed therebetween; And forming a source electrode and a drain electrode on both sides of the semiconductor layer at predetermined intervals. The method of claim 12, And forming a cell gap compensation pattern corresponding to the column spacer and the white sub-pixel on the second substrate. The method of claim 12, And a liquid crystal cell gap of the red, green and blue subpixels is approximately twice the liquid crystal cell gap of the white subpixel. The method of claim 14, The thickness of the cell gap compensation pattern is formed so that the liquid crystal cell gap of the white subpixel is 1/2 of the liquid crystal cell gap of the red, green and blue subpixels. The method of claim 14, The cell gap compensation pattern and the column spacer are made of the same material.

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