KR20060136079A - Thin film transistor array panel and liquid crystal display including the panel - Google Patents

Abstract

The present invention relates to a thin film transistor array panel and a liquid crystal display device including the same, wherein the thin film transistor array panel is connected to a substrate, first and second transparent electrodes formed on the substrate, and first and second transparent electrodes, respectively. A first area of the first and second reflective electrodes, the first and second reflective electrodes and third and fourth reflective electrodes separated from the first and second transparent electrodes and the first and second reflective electrodes; The ratio is different from the second area ratio of the second and fourth reflective electrodes. According to the present invention, the reflectance curve can be matched to the transmittance curve while the cell spacing is substantially the same, and the reflectance curve of each pixel of RGB can be matched.

Thin film transistor array panel, liquid crystal display, transflective, transmissive area, reflective area, liquid crystal capacitor, auxiliary capacitor

Description

Thin film transistor array panel and liquid crystal display including the same {THIN FILM TRANSISTOR ARRAY PANEL AND LIQUID CRYSTAL DISPLAY INCLUDING THE PANEL}

1 is an equivalent circuit diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a schematic diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a cross-sectional view schematically illustrating an example of a cross-sectional structure of the liquid crystal display shown in FIG. 2.

4 and 5 are cross-sectional views schematically illustrating another example of the cross-sectional structure of the liquid crystal display shown in FIG. 2.

FIG. 6 is an example of a layout view of the liquid crystal display shown in FIG. 4.

FIG. 7 is a cross-sectional view of the liquid crystal display shown in FIG. 6 taken along the line VII-VII.

FIG. 8 is another example of the layout view of the liquid crystal display shown in FIG. 4.

FIG. 9 is a cross-sectional view of the liquid crystal display illustrated in FIG. 8 taken along the line IX-IX.

10 is a diagram illustrating a reflectance curve of a liquid crystal display according to an exemplary embodiment of the present invention together with a transmittance curve.

FIG. 11 is a diagram illustrating reflectance curves of respective RGB pixels when the area ratios of the reflection areas of the respective RGB pixels are the same in the liquid crystal display according to the exemplary embodiment.

12 is a schematic diagram of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 13 is a diagram illustrating reflectance curves of RGB pixels when the area ratios of the reflection regions of the RGB pixels are different in the liquid crystal display of FIG. 12.

The present invention relates to a thin film transistor array panel and a liquid crystal display including the same, and more particularly, to a transflective thin film transistor array panel and a liquid crystal display including the same.

In general, a liquid crystal display device includes a liquid crystal layer positioned between a field generating electrode and a pair of display panels provided with a polarizing plate. The field generating electrode generates an electric field in the liquid crystal layer and the arrangement of the liquid crystal molecules changes as the intensity of the electric field changes. For example, in the state where an electric field is applied, the liquid crystal molecules of the liquid crystal layer change its arrangement to change the polarization of light passing through the liquid crystal layer. The polarizer displays a desired image by appropriately blocking or transmitting polarized light to create bright and dark areas.

Since the liquid crystal display is a light-receiving display device that does not emit light by itself, light from a lamp of a separately provided backlight unit passes through the liquid crystal layer, or light from external sources such as natural light passes through the liquid crystal layer once again. Reflects and passes the liquid crystal layer again. The former case is called a transmissive liquid crystal display device, and the latter case is called a reflective liquid crystal display device. The latter case is mainly used for small and medium size display devices. In addition, a semi-transmissive or reflective-transmissive liquid crystal display device using either a backlight device or an external light is developed according to the environment, and is mainly applied to a small and medium display device.

In the transflective liquid crystal display, each pixel has a transmissive region and a reflective region. In the transmissive region, the light passes through the liquid crystal layer only once and twice in the reflective region, so a gamma curve in the transmissive region and a gamma in the reflective region are provided. The curves do not coincide, resulting in different images in the two areas.

Therefore, in order to solve this problem, the thickness of the liquid crystal layer, that is, the cell gap of the transmission region and the reflection region is changed. On the other hand, the driving mode may be driven at different voltages in the transmission mode mainly using the transmission region and in the reflection mode mainly using the reflection region.

However, in the method of varying the cell spacing, a process of forming a thick film in the reflective region is required, which complicates the process. In addition, since there is a large step at the boundary between the transmission region and the reflection region, liquid crystal alignment may not be properly performed (disclination), and an afterimage may occur. Furthermore, as the voltage applied to the reflective electrode increases, the phenomenon that the reflected luminance decreases also occurs. On the other hand, in the method of applying different voltages in the transmission region and the reflection region, the threshold voltage of the reflected luminance is different from the threshold voltage of the transmittance luminance so that the gamma curves of the two regions cannot be matched.

Accordingly, an object of the present invention is to provide a thin film transistor array panel and a liquid crystal display including the same, wherein the gamma curve of the reflection mode is matched to the gamma curve of the transmission mode while the cell spacing is substantially the same.

According to an embodiment of the present invention, a thin film transistor array panel includes a substrate, first and second transparent electrodes formed on the substrate, and first and second electrodes connected to the first and second transparent electrodes, respectively. And a second reflecting electrode, and third and fourth reflecting electrodes separated from the first and second transparent electrodes and the first and second reflecting electrodes, wherein the first and third reflecting electrodes are first and second reflecting electrodes. The area ratio is different from the second area ratio of the second and fourth reflective electrodes.

The sum of the areas of the first and third reflection electrodes may be substantially the same as the sum of the areas of the second and fourth reflection electrodes.

A third transparent electrode formed on the substrate, a fifth reflective electrode connected to the third transparent electrode, and a sixth reflective electrode separated from the third transparent electrode and the fifth reflective electrode, A third area ratio of the fifth reflective electrode and the sixth reflective electrode may be different from the first and second area ratios.

The sum of the areas of the fifth and sixth reflective electrodes may be substantially the same as the sum of the areas of the first and third reflective electrodes and the sum of the areas of the second and fourth reflective electrodes.

At least one of the transparent electrode, the first reflective electrode, and the first conductor connected thereto may overlap the third reflective electrode or the second conductor connected thereto.

The display device may further include an insulating layer formed between the transparent electrode and the third reflective electrode which overlap each other.

The display device may further include a first insulating film formed between the first conductor and the second conductor, which overlap each other.

The display device may further include a second insulating layer formed between the first and third reflective electrodes and the first conductor.

The semiconductor device may further include an insulating layer formed between the first conductor and the third reflective electrode which overlap each other.

A liquid crystal display device according to another aspect of the present invention includes a plurality of pixels, each pixel includes a transmissive liquid crystal capacitor, a first reflective liquid crystal capacitor connected to the transmissive liquid crystal capacitor, and one end of the transmissive liquid crystal capacitor And a second reflective liquid crystal capacitor separated from the first reflective liquid crystal capacitor, wherein the plurality of pixels include first and second pixels respectively displaying different primary colors. The reflectance curves of the two pixels substantially coincide with each other.

The transmittance curve and the reflectance curve of the pixel may substantially coincide.

The voltage at both ends of the second reflective liquid crystal capacitor may be smaller than the voltage at both ends of the first reflective liquid crystal capacitor.

It may further include an auxiliary capacitor connected to the second reflective liquid crystal capacitor.

Capacities of the auxiliary capacitors of the first and second pixels may be different from each other.

The display device may further include a switching element connected to the transmissive liquid crystal capacitor, the first reflective liquid crystal capacitor, and the auxiliary capacitor.

The transmissive liquid crystal capacitor and the first reflective liquid crystal capacitor may receive a data voltage from the switching element, and the second reflective liquid crystal capacitor may receive a voltage smaller than the data voltage from the auxiliary capacitor.

The transmissive liquid crystal capacitor and the first reflective liquid crystal capacitor each include a transparent electrode and a first reflective electrode connected to the switching element, and the second reflective liquid crystal capacitor includes the transparent electrode and the first reflective electrode. It may include a separate second reflective electrode.

An area ratio of the first and second reflective electrodes of the first pixel and an area ratio of the first and second reflective electrodes of the second pixel may be different from each other.

The plurality of pixels include red pixels, green pixels, and blue pixels displaying red, green, and blue colors, respectively, wherein a first area ratio of the first and second reflective electrodes of the red pixels is defined by the first and second pixels of the green pixels. The second area ratio may be smaller than the second area ratio of the second reflective electrode, and the third area ratio of the first and second reflective electrodes of the blue pixel may be greater than the second area ratio.

The primary color may include red, green, and blue.

DETAILED DESCRIPTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

Now, a thin film transistor array panel and a liquid crystal display including the same according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an equivalent circuit diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is a schematic diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.

The liquid crystal display according to the exemplary embodiment of the present invention includes a plurality of display signal lines and a plurality of pixels connected to the display signal lines and arranged in a substantially matrix form when viewed in an equivalent circuit. 1 and 2, the liquid crystal display includes a thin film transistor array panel 100, a common electrode panel 200 facing each other, and a liquid crystal layer 3 interposed therebetween. The display signal line is provided in the thin film transistor array panel 100 and includes a plurality of gate lines GL for transmitting a gate signal (also referred to as a “scan signal”) and a data line DL for transmitting a data signal. The gate lines GL extend substantially in the row direction and are substantially parallel to each other, and the data lines DL extend substantially in the column direction and are substantially parallel to each other.

As illustrated in FIG. 1, each pixel includes a switching element Q connected to a gate line GL and a data line DL, a liquid crystal capacitor C _LC0 , and a first reflection connected thereto. Second type liquid crystal capacitor (C _LC2 ) connected to a liquid crystal capacitor (C _LC1 ), an auxiliary capacitor (C _AUX ), and a storage capacitor (C _ST ) and an auxiliary capacitor (C _AUX ). It includes. The holding capacitor C _ST can be omitted as necessary.

The switching element Q is formed of a thin film transistor or the like provided in the thin film transistor array panel 100, respectively, a control terminal connected to the gate line GL, an input terminal connected to the data line DL, and a transmission type. A three-terminal element having an output terminal connected to the liquid crystal capacitor C _LC0 , the first reflective liquid crystal capacitor C _LC1 , the auxiliary capacitor C _AUX , and the storage capacitor C _ST .

As illustrated in FIG. 2, the transmissive liquid crystal capacitor C _LC0 has two terminals, the transparent electrode 192 of the thin film transistor array panel 100 and the common electrode 270 of the common electrode display panel 200 as two terminals. 270 between the liquid crystal layer 3 functions as a dielectric. The transparent electrode 192 is connected to the switching element Q, and the common electrode 270 is formed on the front surface of the common electrode display panel 200 and receives a common voltage Vcom. Unlike in FIG. 2, the common electrode 270 may be provided in the thin film transistor array panel 100. In this case, at least one of the two electrodes 192 and 270 may be linear or rod-shaped.

The first reflective liquid crystal capacitor C _LC1 has two terminals, the first reflective electrode 194 of the thin film transistor array panel 100 and the common electrode 270 of the common electrode display panel 200 as two terminals. The liquid crystal layer 3 in between functions as a dielectric. The first reflective electrode 194 is connected to the switching element Q.

The second reflective liquid crystal capacitor C _LC2 has two terminals, the second reflective electrode 196 of the thin film transistor array panel 100 and the common electrode 270 of the common electrode display panel 200 as two terminals, and the two electrodes 196 and 270. The liquid crystal layer 3 in between functions as a dielectric. The second reflective electrode 196 is connected to the auxiliary capacitor C _AUX , but is separated from the transparent electrode 192 and the first reflective electrode 194.

The auxiliary capacitor C _AUX may include at least one of the second reflective electrode 196 or a conductor connected thereto (not shown), the transparent electrode 192, the first reflective electrode 194, and a conductor connected thereto (not shown). It overlaps with, and there is an insulator between them.

When a data voltage corresponding to an image signal is applied through the switching element Q, a difference voltage (hereinafter referred to as a pixel voltage) between the data voltage and the common voltage Vcom is a transmissive liquid crystal capacitor C _LC0 and a first reflective liquid crystal. It is _caught across the capacitor C _LC1 . A second reflective LC capacitor (C _LC2), and is a pixel voltage to both ends of the auxiliary capacitor (C _AUX) is applied, a second reflective LC capacitor (C _LC2) and the auxiliary capacitor (C _AUX) is divided by the pixel voltage. As a result, the voltage across the second reflective liquid crystal capacitor C _LC2 is smaller than the pixel voltage.

The transflective liquid crystal display may be partitioned into a transmissive area TA and first and second reflective areas RA1 and RA2 defined by the transparent electrode 192 and the first and second reflective electrodes 194 and 196, respectively. Can be. Specifically, the portions positioned above and below the exposed portion of the transparent electrode 192 become the transmission area TA, and the portions positioned above and below the first and second reflective electrodes 194 and 196 are respectively the first and the first portions. It becomes two reflection areas RA1 and RA2.

In the transmission area TA, light emitted from a lamp of a backlight device (not shown) positioned under the thin film transistor array panel 100 is passed through the liquid crystal layer 3 to display an image. In the first and second reflective regions RA1 and RA2, light that passes through the common electrode display panel 200 from the outside, such as natural light, passes through the liquid crystal layer 3 once and then passes through the first and second reflective electrodes 194 and 196. Reflects the light and passes the liquid crystal layer 3 again to display an image.

The storage capacitor C _ST , which serves as an auxiliary role of the liquid crystal capacitors C _LC0 , C _LC1 , and C _LC2 , includes a storage electrode (not shown) and a transparent electrode 192 or a first electrode provided in the thin film transistor array panel 100. The reflective electrode 194 overlaps the insulator, and a predetermined voltage such as the common voltage Vcom is applied to the sustain electrode. However, the storage capacitor C _ST may be formed by the transparent electrode 192 or the first reflective electrode 194 overlapping the front gate line directly above the insulator.

Next, the cross-sectional structure of the liquid crystal display according to the exemplary embodiment of the present invention will be described in detail with reference to FIGS. 3 to 5.

3 is a cross-sectional view schematically showing an example of the cross-sectional structure of the liquid crystal display shown in FIG. 2, and FIGS. 4 and 5 schematically show another example of the cross-sectional structure of the liquid crystal display shown in FIG. 2. It is a cross section.

As an example of a cross-sectional structure of the liquid crystal display of the present invention, as shown in FIG. 3, the thin film transistor array panel 100 has a storage electrode 137 formed on an insulating substrate 110, and a gate insulating film ( 140 is formed, and the output terminal electrode 170 of the switching element Q is formed on the gate insulating layer 140. The storage capacitor C _ST is formed by overlapping the storage electrode 137 and the output terminal electrode 170. The first insulating layer 187a is formed on the output terminal electrode 170, the contact hole 183 is formed in the first insulating layer 187a, and the transparent electrode 192 is formed on the first insulating layer 187a. The transparent electrode 192 is physically and electrically connected to the output terminal electrode 170 through the contact hole 183. A second insulating film 187b having an uneven pattern is formed on the transparent electrode 192 in the first and second reflective regions RA1 and RA2, and the first and second reflective electrodes 194 and 196 are formed thereon. It is. The first reflective electrode 194 is connected to the transparent electrode 192 and is separated from the second reflective electrode 196.

The color filter 230 and the common electrode 270 are formed on the insulating substrate 210 in the common electrode display panel 200, and the liquid crystal layer 3 is positioned between the two display panels 100 and 200.

The transmissive liquid crystal capacitor C _LC0 and the first and second reflective liquid crystal capacitors C _LC1 and C _LC2 are transparent electrodes 192, first and second reflective electrodes 194 and 196, and a common electrode 270, respectively. Are made of two terminals and the liquid crystal layer 3 is made of a dielectric. The auxiliary capacitor C _AUX is formed by overlapping the transparent electrode 192 and the second reflective electrode 196 with the second insulating layer 187b interposed therebetween. The transmission area TA and the first and second reflection areas RA1 and RA2 have a step difference by the thickness of the second insulating layer 182.

As another example of the cross-sectional structure of the liquid crystal display of the present invention, as shown in FIG. 4, the sustain electrode 137 and the auxiliary electrode 120 are formed on the insulating substrate 110 in the thin film transistor array panel 100. The gate insulating film 140 is formed thereon, and the output terminal electrode 170 of the switching element Q is formed on the gate insulating film 140. The storage capacitor C _ST is formed by overlapping the storage electrode 137 and the output terminal electrode 170, and the auxiliary capacitor C _AUX includes the gate electrode 140 having the auxiliary electrode 120 and the output terminal electrode 170. It is overlapped with. An insulating film 187 having an uneven pattern is formed on the output terminal electrode 170. The contact hole 183 is formed in the insulating film 187, and the contact hole 184 is formed in the gate insulating film 140 and the insulating film 187. The transparent electrode 192 and the first and second reflective electrodes 194 and 196 are formed on the insulating film 187. The first reflective electrode 194 is physically and electrically connected to the output terminal electrode 170 through the contact hole 183, and is also connected to the transparent electrode 192. The second reflective electrode 196 is physically and electrically connected to the auxiliary electrode 120 through the contact hole 184, but is separated from the first reflective electrode 194.

The color filter 230 and the common electrode 270 are formed on the insulating substrate 210 in the common electrode display panel 200, and the liquid crystal layer 3 is positioned between the two display panels 100 and 200.

The transmissive liquid crystal capacitor C _LC0 and the first and second reflective liquid crystal capacitors C _LC1 and C _LC2 are transparent electrodes 192, first and second reflective electrodes 194 and 196, and a common electrode 270, respectively. Are made of two terminals and the liquid crystal layer 3 is made of a dielectric. The auxiliary capacitor C _AUX is formed by overlapping the output terminal electrode 170 and the auxiliary electrode 120 with the gate insulating layer 140 interposed therebetween, and further, the output terminal electrode 170 and the second reflective electrode 196 are The insulating film 187 is interposed therebetween. Unlike the previous example, the cell spacing is substantially the same in the transmission area TA and the first and second reflection areas RA1 and RA2.

As another example of the cross-sectional structure of the liquid crystal display of the present invention, as shown in FIG. 5, in the thin film transistor array panel 100, a storage electrode 137 is formed on the insulating substrate 110, and a gate insulating film ( 140 is formed, and the output terminal electrode 170 of the switching element Q is formed on the gate insulating layer 140. The storage capacitor C _ST is formed by overlapping the storage electrode 137 and the output terminal electrode 170. An insulating film 187 having an uneven pattern is formed on the output terminal electrode 170, and contact holes 183 are formed in the insulating film 187. The transparent electrode 192 and the first and second reflective electrodes 194 and 196 are formed on the insulating layer 187. The first reflective electrode 194 is physically and electrically connected to the output terminal electrode 170 through the contact hole 183, and is also connected to the transparent electrode 192, but is separated from the second reflective electrode 196. have.

The color filter 230 and the common electrode 270 are formed on the insulating substrate 210 in the common electrode display panel 200, and the liquid crystal layer 3 is positioned between the two display panels 100 and 200.

The transmissive liquid crystal capacitor C _LC0 and the first and second reflective liquid crystal capacitors C _LC1 and C _LC2 are transparent electrodes 192, first and second reflective electrodes 194 and 196, and a common electrode 270, respectively. Are made of two terminals and the liquid crystal layer 3 is made of a dielectric. The auxiliary capacitor C _AUX is formed by overlapping the second reflective electrode 196 and the output terminal electrode 170 with the insulating layer 187 therebetween. The cell spacing in the transmission area TA and the first and second reflection areas RA1 and RA2 is substantially the same.

Then, as an example, the structure of the liquid crystal display according to the exemplary embodiment of the present invention will be described in detail with reference to FIGS. 6 and 7.

6 is an example of the layout of the liquid crystal display shown in FIG. 4, and FIG. 7 is a cross-sectional view of the liquid crystal display shown in FIG. 6 taken along the line VII-VII.

The liquid crystal display according to the exemplary embodiment of the present invention includes a thin film transistor array panel 100 and a common electrode panel 200 facing each other, and a liquid crystal layer 3 interposed between the two display panels 100 and 200.

First, the thin film transistor array panel 100 will be described.

A plurality of gate lines 121, a plurality of storage electrode lines 131, and a plurality of auxiliary electrodes 126 are formed on an insulating substrate 110 made of transparent glass or plastic. A gate conductor is formed.

The gate line 121 transmits a gate signal and mainly extends in a horizontal direction. Each gate line 121 includes a plurality of gate electrodes 124 protruding upward and end portions 129 having a large area for connection with another layer or an external driving circuit. A gate driving circuit (not shown) for generating a gate signal may be mounted on a flexible printed circuit film (not shown) attached to the substrate 110 or directly mounted on the substrate 110, It may be integrated into the substrate 110. When the gate driving circuit is integrated on the substrate 110, the gate line 121 may extend to be directly connected to the gate driving circuit.

The storage electrode line 131 receives a predetermined voltage and almost extends in parallel with the gate line 121. Each storage electrode line 131 is positioned between two adjacent gate lines 121 and is close to a lower side of the two gate lines 121. The storage electrode line 131 includes a storage electrode 137 extending up and down. However, the shape and arrangement of the storage electrode line 131 may be modified in various ways.

The auxiliary electrodes 126 are separated from each other between the gate line 121 and the storage electrode line 131, and are spaced apart from the gate line 121 and the storage electrode line 131 at predetermined intervals.

The gate conductors 121, 126, and 131 may be formed of aluminum-based metals such as aluminum (Al) or aluminum alloys, silver-based metals such as silver (Ag) or silver alloys, copper-based metals such as copper (Cu) or copper alloys, and molybdenum (Mo). ) And molybdenum-based metals such as molybdenum alloys, chromium (Cr), tantalum (Ta) and titanium (Ti). However, they may have a multilayer structure including two conductive films (not shown) having different physical properties. One of the conductive films is made of a metal having low resistivity, such as aluminum-based metal, silver-based metal, or copper-based metal, so as to reduce signal delay or voltage drop. In contrast, other conductive films are made of other materials, particularly materials having excellent physical, chemical, and electrical contact properties with indium tin oxide (ITO) and indium zinc oxide (IZO), such as molybdenum-based metals, chromium, tantalum, and titanium. Good examples of such a combination include a chromium bottom film, an aluminum (alloy) top film, and an aluminum (alloy) bottom film and a molybdenum (alloy) top film. However, the gate line 121 and the storage electrode line 131 may be made of various other metals or conductors.

Side surfaces of the gate conductors 121, 126, and 131 are inclined with respect to the surface of the substrate 110, and an inclination angle thereof is preferably about 30 ° to about 80 °.

A gate insulating layer 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the gate conductors 121, 126, and 131.

A plurality of linear semiconductors 151 made of hydrogenated amorphous silicon (hereinafter referred to as a-Si) or polysilicon are formed on the gate insulating layer 140. The linear semiconductor 151 mainly extends in the longitudinal direction and includes a plurality of extensions 154 extending toward the gate electrode 124. The linear semiconductor 151 has a wider width in the vicinity of the gate line 121 and covers them widely.

A plurality of linear and island ohmic contacts 161 and 165 are formed on the semiconductor 151. The ohmic contacts 161 and 165 may be made of a material such as n + hydrogenated amorphous silicon in which n-type impurities such as phosphorus are heavily doped, or may be made of silicide. The linear ohmic contact 161 has a plurality of protrusions 163, and the protrusion 163 and the island-type ohmic contact 165 are paired and disposed on the protrusion 154 of the semiconductor 151.

Side surfaces of the semiconductor 151 and the ohmic contacts 161 and 165 are also inclined with respect to the surface of the substrate 110, and the inclination angle is about 30 ° to about 80 °.

A data conductor including a plurality of data lines 171 and a plurality of drain electrodes 175 is formed on the ohmic contacts 161 and 165 and the gate insulating layer 140. It is.

The data line 171 transmits a data signal and mainly extends in the vertical direction to cross the gate line 121 and the storage electrode line 131. Each data line 171 includes a plurality of source electrodes 173 extending toward the gate electrode 124 and an end portion 179 having a large area for connection with another layer or an external driving circuit. A data driving circuit (not shown) for generating a data signal is mounted on a flexible printed circuit film (not shown) attached to the substrate 110, directly mounted on the substrate 110, or integrated in the substrate 110. Can be. When the data driving circuit is integrated on the substrate 110, the data line 171 may be extended to be directly connected to the data driving circuit.

The drain electrode 175 is separated from the data line 171 and faces the source electrode 173 around the gate electrode 124. Each drain electrode 175 is substantially rectangular and has a concave portion at the side of the gate line 121, and an extension part 177 and a gate electrode 124 overlapping with one storage electrode 137 and one auxiliary electrode 126. ) And overlapping parts. An opening 178 is formed in the extension 177 overlapping the auxiliary electrode 126.

One gate electrode 124, one source electrode 173, and one drain electrode 175 together with the protrusion 154 of the semiconductor 151 form one thin film transistor (TFT). A channel of the transistor is formed in the protrusion 154 between the source electrode 173 and the drain electrode 175.

The data conductors 171 and 175 are preferably made of a refractory metal such as molybdenum, chromium, tantalum and titanium, or an alloy thereof, and a refractory metal film (not shown) and a low resistance conductive film (not shown). It may have a multi-layer structure including). Examples of the multilayer structure include a double layer of chromium or molybdenum (alloy) lower layer and an aluminum (alloy) upper layer, and a triple layer of molybdenum (alloy) lower layer and aluminum (alloy) interlayer and molybdenum (alloy) upper layer. However, the data line 171 and the drain electrode 175 may be made of various metals or conductors.

In addition, the data conductors 171 and 175 may be inclined at an inclination angle of about 30 ° to about 80 ° with respect to the surface of the substrate 110.

The ohmic contacts 161 and 165 exist only between the semiconductor 151 below and the data line 171 and the drain electrode 175 thereon, and lower the contact resistance therebetween. Although the linear semiconductor 151 is narrower than the data line 171 in most places, as described above, the width of the linear semiconductor 151 is widened at the portion where it meets the gate line 121 to smooth the profile of the surface, thereby disconnecting the data line 171. prevent. The semiconductor 151 has an exposed portion between the source electrode 173 and the drain electrode 175, and not covered by the data line 171 and the drain electrode 175.

A passivation layer 180 is formed on the data conductors 171 and 175 and the exposed portion of the semiconductor 151. The passivation layer 180 includes a lower layer 180p made of an inorganic insulator such as silicon nitride or silicon oxide and an upper layer 180q made of an organic insulator. The upper passivation layer 180q preferably has a dielectric constant of 4.0 or less, may have photosensitivity, and irregularities are formed on a surface thereof. However, the passivation layer 180 may have a single layer structure made of an inorganic insulator or an organic insulator.

The upper passivation layer 180q is removed from the end portions 129 and 179 of the gate line 121 and the data line 171, and only the lower passivation layer 180p remains.

In the passivation layer 180, a plurality of contact holes 182 and 185 exposing the end portion 179 and the drain electrode 175 of the data line 171 are formed, respectively, and the passivation layer 180 and the gate insulating layer are formed. A plurality of contact holes 181 and 186 exposing the end portion 129 and the auxiliary electrode 126 of the gate line 121 are formed at 140. The contact hole 186 is formed through the opening 178 of the drain electrode 175 and is spaced apart from the opening 178 at a sufficient interval.

A plurality of first and second pixel electrodes 191 and 195 and a plurality of contact assistants 81 and 82 are formed on the passivation layer 180.

The first and second pixel electrodes 191 and 195 are separated from each other, and are curved along the unevenness of the upper passivation layer 180q. The first pixel electrode includes a transparent electrode 192 and a first reflective electrode 194 thereon, and the second pixel electrode also includes a transparent electrode 193 and a second reflective electrode 196 thereon. The first reflective electrode 194 exists only on a portion of the transparent electrode 192 to expose another portion of the transparent electrode 192, but the second reflective electrode 196 covers the entire transparent electrode 193. The transparent electrodes 192 and 193 are made of a transparent conductive material such as ITO or IZO, and the reflective electrodes 194 and 196 are made of a reflective metal such as aluminum, silver, chromium or an alloy thereof. However, the reflective electrodes 194 and 196 may be formed of a low resistance reflective upper film (not shown) such as aluminum, silver, or an alloy thereof, and a lower film (not shown) having good contact properties with ITO or IZO such as molybdenum-based metal, chromium, tantalum, and titanium It is possible to have a double membrane structure.

One pixel is divided into a transmission area TA and first and second reflection areas RA1 and RA2. Specifically, the upper and lower parts of the exposed transparent electrode 192 become the transmission area TA, and the upper and lower parts of the first reflection electrode 194 become the first reflection area RA1 and the upper and lower parts of the second reflection electrode 196. Becomes the second reflective region RA2. In one pixel, the transmission area TA, the first reflection area RA1, and the second reflection area RA2 are sequentially arranged from the front gate line 121. The cell spacing in the transmission area TA and the first and second reflection areas RA1 and RA2 is substantially the same.

The first pixel electrode 191 is physically and electrically connected to the extension 177 of the drain electrode 175 through the contact hole 185 and receives a data voltage from the drain electrode 175. The first pixel electrode 191 to which the data voltage is applied generates an electric field together with the common electrode 270 of the common electrode display panel 200 to which the common voltage is applied to the liquid crystal layer 3 between the two electrodes 191 and 270. Determines the direction of the liquid crystal molecules. The polarization of light passing through the liquid crystal layer 3 varies according to the direction of the liquid crystal molecules determined as described above.

The exposed transparent electrode 192 and the common electrode 270 form a transmissive liquid crystal capacitor C _LC0 , and the first reflective electrode 194 and the common electrode 270 form a first reflective liquid crystal capacitor C _LC1 . The applied voltage is maintained even after the thin film transistor is turned off.

The extended portion 177 of the pixel electrode 191 and the drain electrode 175 connected to the pixel electrode 191 overlaps the storage electrode 137 to form a storage capacitor C _ST , and the storage capacitor C _ST is a liquid crystal capacitor C _LC0,. Enhance the voltage holding capability of C _LC1 ).

In the auxiliary capacitor C _AUX , the extension 177 of the drain electrode 175 overlaps the auxiliary electrode 126 and the second pixel electrode 195, and is lower than the data voltage from the drain electrode 175. Is applied to the second pixel electrode 195.

The second pixel electrode 195 is physically and electrically connected to the auxiliary electrode 126 through the contact hole 186, and receives a voltage lower than the data voltage through the auxiliary capacitor C _AUX . The second pixel electrode 195 to which this voltage is applied rearranges the liquid crystal molecules of the liquid crystal layer 3 between the two by generating an electric field together with the common electrode 270. The second pixel electrode 195 and the common electrode 270 form a second reflective liquid crystal capacitor C _LC2 , and the second reflective liquid crystal capacitor C _LC2 is connected in series with the auxiliary capacitor C _AUX .

In the transmissive area TA, light is incident on the back side of the liquid crystal display, that is, the thin film transistor array panel 100, passes through the liquid crystal layer 3 and exits the front side, that is, toward the common electrode display panel 200. In the first and second reflective regions RA1 and RA2, light from the front surface enters the liquid crystal layer 3 and is reflected by the first and second reflective electrodes 194 and 196, respectively, to return the liquid crystal layer 3 again. The marking is carried out by passing through and out to the front. At this time, bending of the reflective electrodes 194 and 196 increases the reflection efficiency of the light.

The contact auxiliary members 81 and 82 are connected to the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 through the contact holes 181 and 182, respectively. The contact auxiliary members 81 and 82 compensate for and protect the adhesion between the end portion 129 of the gate line 121 and the end portion 179 of the data line 171 and the external device.

Next, the common electrode display panel 200 will be described.

A light blocking member 220 is formed on an insulating substrate 210 made of transparent glass, plastic, or the like. The light blocking member 220 is also referred to as a black matrix and defines a plurality of opening regions facing the pixel electrodes 191 and 195, and prevents light leakage between neighboring pixel electrodes 191 and 195.

A plurality of color filters 230 are also formed on the substrate 210, and are disposed so as to almost fit into the opening region surrounded by the light blocking member 220. The color filter 230 may extend in the vertical direction along the pixel electrode 191 to form a stripe. Each color filter 230 may display one of primary colors such as three primary colors of red, green, and blue.

Light holes 240 are formed in the color filters 230 of the reflection areas RA1 and RA2. The light hole 240 compensates for the difference in color tone due to the number of light passing through the color filter 230 in the reflection areas RA1 and RA2 and the transmission area TA. Unlike the light hole 240, the color filter 230 may be different in the transmission area TA and the reflection area RA to compensate for the difference in color tone. A filler is filled in the light hole 240 to planarize the surface of the color filter 230, thereby reducing the step that may be formed by the light hole 240.

The common electrode 270 is formed on the color filter 230 and the light blocking member 220. The common electrode 270 is preferably made of a transparent conductor such as ITO or IZO.

An alignment layer (not shown) for aligning the liquid crystal layer 3 is coated on the inner surfaces of the display panels 100 and 200, and one or more polarizers are disposed on the outer surfaces of the display panels 100 and 200. (Not shown) is provided.

The liquid crystal layer 3 is vertically or horizontally aligned.

The liquid crystal display further includes a plurality of elastic spacers (not shown) that hold the thin film transistor array panel 100 and the common electrode panel 200 to form a gap therebetween.

The liquid crystal display may further include a sealant (not shown) for coupling the thin film transistor array panel 100 and the common electrode panel 200. The sealing material is positioned at the edge of the common electrode display panel 200.

Then, as another example, the structure of the liquid crystal display according to the exemplary embodiment of the present invention will be described in detail with reference to FIGS. 8 and 9.

FIG. 8 is another example of the layout of the liquid crystal display shown in FIG. 4, and FIG. 9 is a cross-sectional view of the liquid crystal display shown in FIG. 8 taken along the line IX-IX.

In the following example, detailed description of the same parts as in the previous example will be omitted.

The liquid crystal display according to the present exemplary embodiment also includes a thin film transistor array panel 100, a common electrode display panel 200, and a liquid crystal layer 3 interposed between the two display panels 100 and 200.

The thin film transistor array panel 100 includes a plurality of gate lines 121 including a plurality of gate electrodes 124, a plurality of storage electrode lines 131 including a plurality of storage electrodes 137, and a plurality of first auxiliary electrodes. A gate conductor including the electrode 127 is formed on the substrate 110. The storage electrode 137 is formed adjacent to the gate line 121, and the first auxiliary electrode 127 is formed apart from the storage electrode 137 and is formed adjacent to the front gate line 121. The first auxiliary electrode 127 is made of the same metal as the gate line 121 and the storage electrode line 131, and may have a single film or a plurality of film structures.

On the gate conductors 121, 131, and 127, a plurality of linear ohmic contacts including a gate insulating layer 140, a plurality of linear semiconductors 151 including a plurality of protrusions 154, and a plurality of protrusions 163 ( 161 and the plurality of island resistive contact members 165 are sequentially formed.

A data conductor including a plurality of data lines 171 having a plurality of source electrodes 173, a plurality of drain electrodes 175, and a plurality of second auxiliary electrodes 176 may include the ohmic contacts 161 and 165. It is formed on the gate insulating layer 140. The second auxiliary electrode 176 is separated from the data line 171 and the drain electrode 175, has a shape substantially the same as that of the first auxiliary electrode 127, and overlaps the second auxiliary electrode 176. Opening 174 is formed. The second auxiliary electrode 176 may be made of the same metal as the data line 171 and the drain electrode 175, and may have a multilayer structure.

The passivation layer 180 including the lower layer 180p and the upper layer 180q is sequentially formed on the data conductors 171, 175, and 176 and the exposed semiconductor 151. In the passivation layer 180, contact holes 182, 185, and 188 exposing the end portion 179 of the data line 171, the extension 177 of the drain electrode 175, and the second auxiliary electrode 176 are formed. In the passivation layer 180 and the gate insulating layer 140, a plurality of contact holes 181 and 189 respectively exposing the end portion of the gate line 121 and the first auxiliary electrode 127 are formed. The contact hole 189 is formed through the opening 174 of the second auxiliary electrode 176, and is spaced apart from the opening 174 by a sufficient distance.

A plurality of first and second pixel electrodes 191 and 195 and a plurality of contact auxiliary members 81 and 82 are formed on the passivation layer 180.

The first and second pixel electrodes 191 and 195 are separated from each other, and the first pixel electrode includes a transparent electrode 192 and a first reflective electrode 194 thereon, and the second pixel electrode is also a transparent electrode. 193 and second reflective electrode 196 thereon. The first reflective electrode 194 exists only on a portion of the transparent electrode 192 to expose another portion of the transparent electrode 192, but the second reflective electrode 196 covers the entire transparent electrode 193.

One pixel is divided into a transmission area TA and first and second reflection areas RA1 and RA2. Specifically, the upper and lower parts of the exposed transparent electrode 192 become the transmission area TA, and the upper and lower parts of the first reflection electrode 194 become the first reflection area RA1 and the upper and lower parts of the second reflection electrode 196. Becomes the second reflective region RA2. Unlike the previous example, in one pixel, the first reflection area RA1 and the second reflection area RA2 are disposed opposite to each other with the transmission area TA interposed therebetween. The cell spacing in the transmission area TA and the first and second reflection areas RA1 and RA2 is substantially the same.

The first pixel electrode 191 is physically and electrically connected to the extension 177 of the drain electrode 175 through the contact hole 185 and receives a data voltage from the drain electrode 175. The exposed transparent electrode 192 and the common electrode 270 form a transmissive liquid crystal capacitor C _LC0 , and the first reflective electrode 194 and the common electrode 270 form the first reflective liquid crystal capacitor C _LC1 . Achieve.

The transparent electrode 192 has a protrusion protruding toward the second reflective region RA2, and the protrusion is physically and electrically connected to the second auxiliary electrode 176 through the contact hole 188, so that the second auxiliary electrode 176 is provided. To the data voltage. The second auxiliary electrode 176 overlaps the first auxiliary electrode 127 and the second pixel electrode 195 to form an auxiliary capacitor C _AUX , and the auxiliary capacitor C _{AUX is} connected to the second auxiliary electrode 176. The applied data voltage is divided to output a voltage lower than the data voltage to the second pixel electrode 195.

The second pixel electrode 195 is physically and electrically connected to the first auxiliary electrode 127 through the contact hole 189, and receives a voltage lower than the data voltage through the auxiliary capacitor C _AUX . The second pixel electrode 195 and the common electrode 270 form a second reflective liquid crystal capacitor C _LC2 , and the second reflective liquid crystal capacitor C _LC2 is connected in series with the auxiliary capacitor C _AUX .

The light blocking member 220, the plurality of color filters 230, and the common electrode 270 are formed on the insulating substrate 210 in the common electrode display panel 200, and the light holes 240 are formed in the color filter 230. Formed.

Next, a method of matching the reflectance curve to the transmittance curve in the liquid crystal display will be described in detail with reference to FIG. 10.

FIG. 10 is a diagram illustrating a reflectance curve of a liquid crystal display according to an exemplary embodiment of the present invention together with a transmittance curve.

When a data voltage corresponding to an image signal is applied through the switching element Q, a difference voltage between the data voltage and the common voltage Vcom (hereinafter referred to as the pixel voltage V) is transmitted through the transmission type liquid crystal capacitor C _LC0 and the first. It is _caught by both ends of the reflective liquid crystal capacitor C _LC1 . However, the voltage V2 across the second reflective liquid crystal capacitor C _LC2 is smaller than the pixel voltage V due to the auxiliary capacitor C _AUX and is represented by Equation 1 below.

Here, the capacitor and the capacity of the capacitor used the same sign.

The transmittance curve VT illustrated in FIG. 10 represents luminance in the transmission area TA according to the pixel voltage V, and the first reflectance curve VR1 represents the reflection region RA according to the pixel voltage V. FIG. ) Is the luminance. The transmittance curve VT and the first reflectance curve VR1 are shown using data measured from the test display panel. In this case, the reflection area RA in the test display panel removes the second reflection area RA2 and instead extends the first reflection area RA1. The second reflectance curve VR2 shows the first reflectance curve VR1 according to the voltage of [Equation 1], and the third reflectance curve VR3 shows the first reflectance curve VR1 and the second reflectance curve ( VR2) is synthesized and determined according to the area ratio of the first reflection area RA1 and the second reflection area RA2 of the liquid crystal display according to the exemplary embodiment of the present invention.

If the functions of the first reflectance curve VR1, the second reflectance curve VR2, and the third reflectance curve VR3 are R1 (V), R2 (V) and R3 (V), respectively, R3 (V) is It is the same as [Equation 2].

here And A1 and A2 are the areas of the first and second reflection areas RA1 and RA2, respectively. That is, AR is the area ratio of the second reflection area RA2 to the area of the entire reflection area, and k is the ratio of the voltages V2 across the second reflection type liquid crystal capacitor C _LC2 to the pixel voltage V. to be.

The simulation was performed such that the third reflectance curve VR3 was as close as possible to the transmittance curve VT by varying the area ratio AR and the voltage ratio k. As a result, when the area ratio AR was 0.6 and the voltage ratio k was 0.73, the third reflectance curve VR3 almost identical to the transmittance curve VT was derived. According to the simulation result, when the area ratio AR is 0.4 to 0.7 and the voltage ratio k is 0.69 to 0.77, the third reflectance curve VR3 approximating the transmittance curve VT can be derived. However, these values may vary depending on various design factors that determine the transmittance and reflectance.

On the other hand, the auxiliary capacitance (C _AUX ) value for making the voltage ratio k to 0.73 is as follows.

That is, the auxiliary capacitance C _AUX should be 2.7 times the capacity of the second reflective liquid crystal capacitor C _LC2 . The required capacitance can be created by adjusting the width of the electrode constituting the auxiliary capacitance (C _AUX ) and the dielectric constant and thickness of the dielectric.

Next, a liquid crystal display capable of matching a reflectance curve for each RGB pixel according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 11 to 13. Here, the RGB pixel means a pixel having a red (R), green (G), and blue (B) filter 230, respectively.

FIG. 11 is a diagram illustrating reflectance curves of RGB pixels when the area ratios of the reflection regions of the RGB pixels are the same in the liquid crystal display according to the exemplary embodiment of the present invention, and FIG. FIG. 13 is a schematic diagram of a liquid crystal display, and FIG. 13 is a diagram showing reflectance curves of respective RGB pixels when the area ratios of the reflection areas of the RGB pixels are different in the liquid crystal display shown in FIG. 12.

The reflectance curves VRR, VRG, and VRB shown in FIG. 11 are the first and second reflections of each RGB pixel when the area ratio AR of the first and second reflection areas RA1 and RA2 is the same for each RGB pixel. A reflectance curve obtained by synthesizing reflectance curves in the areas RA1 and RA2, and shows that the reflectance curves VRR, VRG, and VRB of each RGB pixel are different from each other. The reflectance is a function of the wavelength, so that when the same voltage is applied, the reflectance of the RGB pixel is the highest in the B pixel in the short wavelength band and the lowest in the R pixel in the long wavelength band. Therefore, the reflectance curve of the B pixel is located to the left of the reflectance curve of the G pixel, and the reflectance curve of the R pixel is located to the right of the reflectance curve of the G pixel. Meanwhile, the reflectance curves VR1, VR2, and VR3 shown in FIG. 10 are not reflectance curves for individual RGB pixels, but reflectance curves for the entire RGB pixels, and the reflectance curves shown in FIGS. 10 and 11 correspond to liquid crystal layers ( The characteristics of 3) and the area of the transmission area TA are different from each other by applying different simulation variables.

As shown in FIG. 12, in the liquid crystal display according to the exemplary embodiment, areas of the first and second reflection areas RA1 and RA2 of each RGB pixel are different. Therefore, the liquid crystal display device has a different area ratio AR of the second reflection area RA2 to the total reflection area RA of each RGB pixel. Specifically, the area ratio AR of the B pixel is the largest and the R pixel is the same. The area ratio of is the smallest. However, the area ratio of the transmission area TA and the reflection area RA of each RGB pixel is the same.

According to the liquid crystal display according to the present exemplary embodiment, the B pixel has a relatively large area of the second reflection area RA2, and thus the reflectance curve VRB moves to the right, and the R pixel has an area of the first reflection area RA1. Since this is relatively large, the reflectance curve VRR shifts to the left. Therefore, by properly determining the area ratio AR of each RGB pixel, the reflectance curves VRR, VRG, and VRB of each RGB pixel can be matched with each other.

As a result of the simulation on the area ratio AR, when the area ratio AR of the RGB pixel is 0.43, 0.6, and 0.72 when the voltage ratio k is 0.70, as shown in FIG. 13, the reflectance curve VRR of the RGB pixel is shown. , VRG, VRB) matched each other. Of course, these reflectance curves (VRR, VRG, VRGB) and transmittance curves coincide with each other.

The liquid crystal display according to the exemplary embodiment of the present invention may vary the size of the storage capacitor C _{AUX for} each RGB pixel. Depending on the size of the storage capacitor C _AUX , the ratio k of the voltages V2 across the second reflective liquid crystal capacitor C _LC2 to the pixel voltage V may be varied, and thus the reflectance of each RGB pixel. The curves VRR, VRG, VRB can be matched. In addition, in the liquid crystal display according to the exemplary embodiment of the present invention, the area ratio AR and the voltage ratio k may be different for each RGB pixel.

In the embodiment of the present invention, the color filter 230 has been described as having red (R), green (G), and blue (B) as the primary colors, but other primary colors, for example, yellow (yellow), cyan ( cyan, magenta, and even so, the area ratio AR of the reflection area of each color pixel is different.

As described above, according to the present invention, the reflection region is divided into two, one of which is applied with the same data voltage as the transmission region, and the other is applied with a voltage smaller than the data voltage, so that the cell spacing is substantially the same while the gamma of the reflection mode is applied. The curve can be matched to the gamma curve in transmission mode.

In addition, by changing the area ratio of the reflection area for each RGB pixel, it is possible to match the reflectance curve of each RGB pixel. As a result, the same image can be displayed in the transmission mode and the reflection mode.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (20)

Board, First and second transparent electrodes formed on the substrate, First and second reflective electrodes respectively connected to the first and second transparent electrodes, and Third and fourth reflective electrodes separated from the first and second transparent electrodes and the first and second reflective electrodes. Including; The first area ratio of the first and third reflective electrodes is different from the second area ratio of the second and fourth reflective electrodes. Thin film transistor display panel. In claim 1, The sum of the areas of the first and third reflection electrodes is substantially the same as the sum of the areas of the second and fourth reflection electrodes. In claim 1, A third transparent electrode formed on the substrate, A fifth reflective electrode connected to the third transparent electrode, and A sixth reflective electrode separated from the third transparent electrode and the fifth reflective electrode More, A third area ratio of the fifth reflective electrode and the sixth reflective electrode is different from the first and second area ratios. Thin film transistor display panel. In claim 3, The sum of the areas of the fifth and sixth reflective electrodes is substantially the same as the sum of the areas of the first and third reflective electrodes and the sum of the areas of the second and fourth reflective electrodes. In claim 1, And at least one of the transparent electrode, the first reflective electrode, and a first conductor connected thereto overlaps the third reflective electrode or a second conductor connected thereto. In claim 5, The thin film transistor array panel of claim 1, further comprising an insulating layer formed between the transparent electrode and the third reflective electrode which are overlapped with each other. In claim 5, The thin film transistor array panel of claim 1, further comprising a first insulating layer formed between the first and second conductors overlapping each other. In claim 7, And a second insulating film formed between the first and third reflective electrodes and the first conductor. In claim 5, The thin film transistor array panel of claim 1, further comprising an insulating layer formed between the first conductor and the third reflective electrode, which overlap each other. It includes a plurality of pixels, Each pixel, Transmissive liquid crystal capacitor, A first reflective liquid crystal capacitor connected to the transmissive liquid crystal capacitor, and A second reflective liquid crystal capacitor having one end separated from the transmissive liquid crystal capacitor and the first reflective liquid crystal capacitor Including, The plurality of pixels includes first and second pixels respectively displaying different primary colors, and reflectance curves of the first and second pixels substantially coincide with each other. Liquid crystal display. In claim 10, And a transmittance curve of the pixel substantially coincides. In claim 10, And a voltage at both ends of the second reflective liquid crystal capacitor is smaller than a voltage at both ends of the first reflective liquid crystal capacitor. In claim 10, And an auxiliary capacitor connected to the second reflective liquid crystal capacitor. In claim 13, The liquid crystal display of claim 1, wherein the capacitors of the first and second pixels have different capacitances. In claim 13, And a switching element connected to the transmissive liquid crystal capacitor, the first reflective liquid crystal capacitor, and the auxiliary capacitor. The method of claim 15, The transmissive liquid crystal capacitor and the first reflective liquid crystal capacitor receive a data voltage from the switching element, The second reflective liquid crystal capacitor receives a voltage smaller than the data voltage from the auxiliary capacitor. Liquid crystal display. The method of claim 15, The transmissive liquid crystal capacitor and the first reflective liquid crystal capacitor each include a transparent electrode and a first reflective electrode connected to the switching element, The second reflective liquid crystal capacitor includes a second reflective electrode separated from the transparent electrode and the first reflective electrode. Liquid crystal display. The method of claim 17, The area ratio of the first and second reflective electrodes of the first pixel and the area ratio of the first and second reflective electrodes of the second pixel are different from each other. The method of claim 18, The plurality of pixels include red pixels, green pixels, and blue pixels displaying red, green, and blue colors, respectively, wherein a first area ratio of the first and second reflective electrodes of the red pixels is defined by the first and second pixels of the green pixels. And a third area ratio of the first and second reflective electrodes of the blue pixel is smaller than the second area ratio of the second reflective electrode. In claim 10, The primary color may include red, green, and blue.

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