KR100920356B1 - Thin film diode panel for liquid crystal display and liquid crystal display including the panel - Google Patents

Abstract

First and second diodes formed on the lower substrate, the first signal line formed on the lower substrate, and the second signal line, the first signal line, and the second signal line formed on the lower substrate and parallel to the first signal line, respectively. A thin film diode display panel formed on the lower substrate and including a pixel electrode connected to the first and second diodes; A color filter display panel including an upper substrate facing the lower substrate, a color filter formed on the lower substrate, and a data electrode line formed on the color filter and crossing the first and second signal lines; A liquid crystal display device comprising a liquid crystal layer injected between a thin film diode display panel and a color filter display panel, wherein dots consisting of red pixels, green pixels, blue pixels, and white pixels corresponding to pixel electrodes are continuously arranged.

DSD, MIM, Thin Film Diode, Liquid Crystal Display, RGBW

Description

Thin film diode panel for liquid crystal display device and liquid crystal display device including the same {Thin film diode panel for liquid crystal display and liquid crystal display including the panel}

1 is a cutaway perspective view of a liquid crystal display according to a first exemplary embodiment of the present invention;

FIG. 2 is a layout view of a thin film diode panel for a vertically aligned mode liquid crystal display device according to a first embodiment of the present invention.

3 is a cross-sectional view taken along the line III-III ′ of FIG. 1;

4 is a layout view of a thin film diode panel for a vertically aligned mode liquid crystal display according to a second exemplary embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along the line VV ′ of FIG. 4;

6 is a layout view illustrating a structure of a unit pixel in a vertical alignment mode liquid crystal display according to a third exemplary embodiment of the present invention.

FIG. 7 is a cross-sectional view taken along the line VII-VII 'of FIG. 6,

8 is an equivalent circuit diagram of a unit pixel structure of a liquid crystal display device to which a thin film diode display panel according to a third exemplary embodiment of the present invention is applied.

FIG. 9 is a layout view of a thin film diode panel for a vertically aligned mode liquid crystal display according to a fourth exemplary embodiment of the present invention.                 

FIG. 10 is a layout view of a thin film diode panel for a vertically aligned mode liquid crystal display according to a fifth exemplary embodiment of the present invention.

FIG. 11 is a layout view of a thin film diode panel for a vertically aligned mode liquid crystal display according to a sixth embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film diode display panel for a liquid crystal display device using a metal insulator metal (MIM) diode as a switching element, and a liquid crystal display device including the same. More specifically, a display panel for a liquid crystal display device using a dual select diode (DSD) method. And a liquid crystal display including the same.

The liquid crystal display is one of the flat panel display devices most widely used at present, and includes two display panels on which a field generating electrode is formed and a liquid crystal layer interposed therebetween. Voltage is applied to both electrodes to generate an electric field in the liquid crystal layer, and the intensity of the electric field is changed to rearrange the liquid crystal molecules of the liquid crystal layer, thereby controlling the transmittance of transmitted light to display an image.

In order to display images of various colors using the liquid crystal display, a plurality of pixels arranged in a matrix manner are selectively driven using a switching element, which is called an active matrix liquid crystal display. At this time, the switching device is typically divided into a thin film transistor and a diode, the diode mainly uses a MIM diode.

The liquid crystal display using the MIM diode displays an image by using an electrical nonlinearity of a MIM diode having an insulating film having a thickness of several tens of nanometers between two metal thin films, and compared to a three-terminal thin film transistor. It has a feature that the structure and the manufacturing process are simple and manufactured at a lower cost than the thin film transistor. However, when a diode is used as a switching element, there is a disadvantage in that a problem occurs in contrast ratio or uniformity of image quality due to the asymmetry in which the applied voltage varies depending on the polarity.

In order to solve this problem, a dual select diode (DSD) method is developed in which two diodes are symmetrically connected to the pixel electrode and the pixels are driven by applying signals having opposite polarities through the two diodes. It became.

In the DSD type liquid crystal display, signals having opposite polarities may be applied to the pixel electrodes to improve the uniformity of image quality, to uniformly control the gradation, to improve the contrast ratio, and to respond to the pixel. The speed can be improved, and an image can be displayed at high resolution in proximity to a liquid crystal display device using a thin film transistor.

However, the DSD type liquid crystal display device also exhibits inferior visibility on the left and right sides due to lateral distortion phenomenon in which a gamma curve representing transmittance with respect to the gray scale voltage does not coincide in the front and side due to the material characteristics of the liquid crystal. For example, the screen tends to be brighter and the color shifts toward white as it goes to the side. In extreme cases, the picture may appear clumped because there is no gap between the bright gradations. However, visibility is becoming more and more important as monitors are being used for multimedia recently and have become larger, and more and more people are watching pictures or watching videos.

An object of the present invention is to provide a display panel for a liquid crystal display (DSD) type liquid crystal display device having the improved luminance and side visibility by applying the RGBW method and a liquid crystal display device including the same.

The liquid crystal display of the present invention for achieving the above object is a lower substrate, a first signal line formed on the lower substrate, a second signal line formed on the lower substrate and formed in parallel with the first signal line, the second A thin film diode display panel including first and second diodes connected to a first signal line and a second signal line, and a pixel electrode formed on the lower substrate and connected to the first and second diodes; A color filter display panel including an upper substrate facing the lower substrate, a color filter formed on the lower substrate, and a data electrode line formed on the color filter and crossing the first and second signal lines; It is preferable that dots including a liquid crystal layer injected between the thin film diode display panel and the color filter display panel and composed of red pixels, green pixels, blue pixels, and white pixels corresponding to the pixel electrodes are continuously arranged.                     

The first and second diodes may include a first lead electrode extending from the first signal line and a second lead electrode extending from the second signal line; First and second insulating layers covering the first and second lead electrodes, respectively; One end is formed on the first insulating film and the second insulating film, and the other end thereof includes a first contact electrode and a second contact electrode connected to the pixel electrode.

In addition, the liquid crystal display of the present invention for achieving the above object is a lower substrate, a first signal line formed on the lower substrate, a second signal line formed on the lower substrate and formed parallel to the first signal line, A plurality of diodes connected to the first signal line and the second signal line, respectively, formed on the lower substrate and divided into two parts through a first cutout, and connected to the plurality of diodes. A thin film diode display panel including an electrode; A color filter display panel including an upper substrate facing the lower substrate, a color filter formed on the lower substrate, and a data electrode line formed on the color filter and crossing the first and second signal lines; It is preferable that dots including a liquid crystal layer injected between the thin film diode display panel and the color filter display panel and composed of red pixels, green pixels, blue pixels, and white pixels corresponding to the pixel electrodes are continuously arranged.

In addition, the data electrode line preferably includes a plurality of cutouts or protrusions for dividing the pixel into at least two or more digestive digestions together with the first cutout.

In addition, the diode is preferably a MIM diode.                     

In addition, the MIM diode may include first and second lead electrodes connected to the first and second signal lines, first and second insulating layers covering the first and second lead electrodes, and a part of the first and second lead electrodes. Preferably, four MIM diodes including first and second contact electrodes overlapping the first and second lead electrodes with an insulating layer interposed therebetween and connected at both ends to the first and second pixel electrodes, respectively. Do.

In addition, the red pixel is defined as a red color filter, the green pixel is a green color filter, and the blue pixel is defined as an area where a blue color filter is formed, and the white pixel is defined as an area where no color filter is formed. It is preferable.

Further, it is preferable that red, green, blue, and white pixels are arranged in the row direction, and pixels of the same color are arranged in the column direction.

In addition, the liquid crystal display of the present invention for achieving the above object is a lower substrate, a first signal line formed on the lower substrate, a second signal line formed on the lower substrate and formed parallel to the first signal line, A thin film diode display panel including first and second diodes connected to the first signal line and the second signal line, and a pixel electrode formed on the lower substrate and connected to the first and second diodes; A color filter display panel including an upper substrate facing the lower substrate, a color filter formed on the lower substrate, and a data electrode line formed on the color filter and crossing the first and second signal lines; Green, red, blue, and white pixels corresponding to the pixel electrode are arranged adjacent to each other, including a liquid crystal layer injected between the thin film diode display panel and the color filter display panel. It is preferable that the pixels form one dot for displaying an image.

The first and second diodes may include a first lead electrode extending from the first signal line and a second lead electrode extending from the second signal line; First and second insulating layers covering the first and second lead electrodes, respectively; One end is formed on the first insulating film and the second insulating film, and the other end thereof includes a first contact electrode and a second contact electrode connected to the pixel electrode.

In addition, the liquid crystal display of the present invention for achieving the above object is a lower substrate, a first signal line formed on the lower substrate, a second signal line formed on the lower substrate and formed parallel to the first signal line, A plurality of diodes connected to the first signal line and the second signal line, respectively, formed on the lower substrate and divided into two parts through a first cutout, and connected to the plurality of diodes. A thin film diode display panel including an electrode; A color filter display panel including an upper substrate facing the lower substrate, a color filter formed on the lower substrate, and a data electrode line formed on the color filter and crossing the first and second signal lines; Green, red, blue, and white pixels corresponding to the pixel electrode are arranged adjacent to each other, including a liquid crystal layer injected between the thin film diode display panel and the color filter display panel. It is preferable that the pixels form one dot for displaying an image.                     

In addition, the liquid crystal display of the present invention for achieving the above object is a lower substrate, a first signal line formed on the lower substrate, a second signal line formed on the lower substrate and formed parallel to the first signal line, A thin film diode display panel including first and second diodes connected to the first signal line and the second signal line, and a pixel electrode formed on the lower substrate and connected to the first and second diodes; A color filter display panel including an upper substrate facing the lower substrate, a color filter formed on the lower substrate, and a data electrode line formed on the color filter and crossing the first and second signal lines; A blue pixel and a white pixel including a liquid crystal layer injected between the thin film diode display panel and the color filter display panel and arranged adjacent to each other in the same pixel column, and red disposed left and right about the blue pixel and the white pixel It is preferable that four pixels of the pixel and the green pixel form one dot.

In addition, the liquid crystal display of the present invention for achieving the above object is a lower substrate, a first signal line formed on the lower substrate, a second signal line formed on the lower substrate and formed parallel to the first signal line, A plurality of diodes connected to the first signal line and the second signal line, respectively, formed on the lower substrate and divided into two parts through a first cutout, and connected to the plurality of diodes. A thin film diode display panel including an electrode; A color filter display panel including an upper substrate facing the lower substrate, a color filter formed on the lower substrate, and a data electrode line formed on the color filter and intersecting the first and second signal lines; A blue pixel and a white pixel including a liquid crystal layer injected between the thin film diode display panel and the color filter display panel and arranged adjacent to each other in the same pixel column, and red disposed left and right about the blue pixel and the white pixel It is preferable that four pixels of the pixel and the green pixel form one dot.

In addition, the liquid crystal display of the present invention for achieving the above object is a lower substrate, a first signal line formed on the lower substrate, a second signal line formed on the lower substrate and formed parallel to the first signal line, A thin film diode display panel including first and second diodes connected to the first signal line and the second signal line, and a pixel electrode formed on the lower substrate and connected to the first and second diodes; A color filter display panel including an upper substrate facing the lower substrate, a color filter formed on the lower substrate, and a data electrode line formed on the color filter and crossing the first and second signal lines; A dot including a liquid crystal layer injected between the thin film diode display panel and the color filter display panel and corresponding to the pixel electrode, the dot consisting of a red pixel, a green pixel, and a blue pixel is converted into a first dot, a red pixel, a green pixel, and a white pixel; When the formed dot is the second dot, the M and the N are odd and even, respectively, the first dot and the second dot are sequentially arranged in the M-th pixel row, and the N-th pixel row adjacent to the M-th pixel row is It is preferable that the M-th pixel row is arranged in a row shifted by the dot as compared with the M-th pixel row, and the pixel group including the M-th pixel row and the N-th pixel row is continuously arranged. .

In addition, the liquid crystal display of the present invention for achieving the above object is a lower substrate, a first signal line formed on the lower substrate, a second signal line formed on the lower substrate and formed parallel to the first signal line, A plurality of diodes connected to the first signal line and the second signal line, respectively, formed on the lower substrate and divided into two parts through a first cutout, and connected to the plurality of diodes. A thin film diode display panel including an electrode; A color filter display panel including an upper substrate facing the lower substrate, a color filter formed on the lower substrate, and a data electrode line formed on the color filter and crossing the first and second signal lines; A dot including a liquid crystal layer injected between the thin film diode display panel and the color filter display panel and corresponding to the pixel electrode, the dot consisting of a red pixel, a green pixel, and a blue pixel is converted into a first dot, a red pixel, a green pixel, and a white pixel; When the formed dot is the second dot, the M and the N are odd and even, respectively, the first dot and the second dot are sequentially arranged in the M-th pixel row, and the N-th pixel row adjacent to the M-th pixel row is It is preferable that the M-th pixel row is arranged in a form shifted in the row direction by a dot compared to the M-th pixel row, and the pixel group consisting of the M-th pixel row and the N-th pixel row is continuously arranged.

The first dot may be a red pixel, a green pixel, and a blue pixel. The second dot may be a red pixel, a green pixel, and a white pixel.                     

The first dot may be a red pixel, a blue pixel, and a green pixel, and the second dot may be a red pixel, a white pixel, and a green pixel.

In addition, the blue pixel and the white pixel of the liquid crystal display are preferably driven to render.

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 portion of a layer, film, region, plate, etc. is said to be "on top" of another part, this includes not only when the other part is "right on" 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.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cutaway perspective view of a liquid crystal display according to a first exemplary embodiment of the present invention.

As shown in FIG. 1, the liquid crystal display according to the first exemplary embodiment of the present invention includes a lower panel (thin film diode panel) 100, an upper panel (opposing panel) 200 and a lower panel 100 facing the lower panel. ) And a liquid crystal layer 3 including liquid crystal molecules aligned between the upper panel 200 and the vertical direction with respect to the surface of the display panel. In this case, a pixel electrode 190 corresponding to a red pixel, a green pixel, a blue pixel, and a white pixel is formed on the lower panel 100, and the dual electrode which transmits a signal having a polarity opposite to the pixel electrode 190 is formed. Scan signal lines 121 and 122 are formed, and MIM diodes D1 and D2 are formed as switching elements. In addition, the upper panel 200 forms an electric field for driving the liquid crystal molecules facing the pixel electrode 190 and crosses the double scan signal lines 121 and 122 to define a pixel region and a red color. The red, green, and blue color filters 220 are sequentially formed in each of the pixel, the green pixel, and the blue pixel, and the color filter is not formed in a portion corresponding to the white pixel.

FIG. 2 is a simplified layout view of a thin film diode display panel for a liquid crystal display device in a vertical alignment mode according to a first embodiment of the present invention.

As shown in FIG. 2, the liquid crystal display according to the first exemplary embodiment of the present invention includes red pixels R, green pixels G, blue pixels B, and white pixels W arranged in a matrix. Are formed, and pixels of the same color are arranged in pixel column units. For example, red pixels, green pixels, blue pixels, and white pixels are sequentially arranged in the row direction, and only pixels of the same color are arranged in the column direction. That is, the red, green, blue, and white pixels have a stripe structure in which pixel units are arranged. Here, the order in which the red, green, blue, and white pixels are arranged is not limited to the above-described one, and since the transmittance of the green pixels is higher than that of the other color pixels, it is preferable not to arrange the green pixels and the white pixels adjacently.

In the pixel arrangement structure according to the first embodiment of the present invention, the red, green, blue, and white pixels sequentially arranged in the row direction are used as "dots" which are basic units for displaying an image. Here, the areas of the pixels constituting the dots are the same.

When the image is displayed using red, green, blue, and white pixels as one dot as in the present invention, the overall light efficiency is increased. For example, suppose that the amount of light passing through the polarizer 12 (see FIG. 1) toward the thin film diode display panel is "1" in the liquid crystal display device. In the case of displaying dots with three pixels of red, green, and blue, the area of each pixel is 1/3, and the transmittance is 1/3 by the color filter. Therefore, the total transmittance of one dot is [1/3 × 1 / 3 (R)] + [1/3 x 1/3 (G)] + [1/3 x 1/3 (B)] = 1/3 = 33.3%.

However, in the first embodiment of the present invention, the area of each pixel is 1/4 and the transmittance of the white pixel is 1 (because there is no color filter in the white pixel), so that the total transmittance of one dot is [1/4 × 1/3 (R)] + [1/4 × 1/3 (G)] + [1/4 × 1/3 (B)] + [1/4 × 1 (W)] = 1/2 = 50 Will be%. As described above, according to the first exemplary embodiment of the present invention, the luminance is about 1.5 times higher than that of the conventional liquid crystal display.

The configuration of the lower panel in the liquid crystal display according to the first exemplary embodiment of the present invention will be described in detail as follows.

3 is a cross-sectional view taken along line III-III ′ of FIG. 2.

As illustrated in FIGS. 2 and 3, a pixel electrode 190 made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) on an insulating substrate 110 made of a transparent insulating material such as glass. ) Is formed. In this case, the pixel electrode 190 is electrically connected to each of the first and second scan signal lines 121 and 122 and two MIM diodes D1 and D2 extending in the horizontal direction, respectively. have. Here, in the case of the reflective liquid crystal display device, the pixel electrode 190 may be formed of a material such as aluminum or silver having excellent reflection characteristics instead of a transparent material.

More specifically, in the thin film diode display panel for liquid crystal display according to the exemplary embodiment of the present invention, the first and second scan signal lines 121 and 122 for transmitting a scan signal or a gate signal on the transparent insulating substrate 110 are pixels. It extends in the transverse direction at the top and bottom of the area. The first and second lead electrodes 123 and 124 connected to the first and second scan signal lines 121 and 122 in the form of branches face each other from the first and second scan signal lines 121 and 122. It is stretched in the direction. Here, the first and second scan signal lines 121 and 122 and the first and second lead electrodes 123 and 124 may be made of tantalum (Ta), and may include other low resistance metals.

Each of the first and second lead electrodes 123 and 124 is covered by first and second insulating layers 151 and 152 including tantalum oxide (Ta ₂ O ₅ ) formed thereon. In this case, the thickness of the tantalum oxide (Ta ₂ O ₅ ) thin film is preferably about 50 nm, and the first and second insulating layers 151 and 152 may include an aluminum oxide layer (Al ₂ O ₃ ).

In addition, a pixel electrode 190 made of a transparent conductive material is formed on the substrate 110. In this case, the pixel electrode 190 has first and second contact portions 191 and 192 extending adjacent to the first and second adjacent electrodes 123 and 124.

In addition, one end of the substrate 110 overlaps the first and second lead electrodes 123 and 124 with the insulating layers 151 and 152 interposed therebetween, and the other end thereof is the first of the pixel electrode 190. And first and second contact electrodes 141 and 142 connected to the second contact parts 191 and 192.

In the thin film diode panel for a liquid crystal display according to the first exemplary embodiment of the present invention, the first insulating layer 151 and the first contact electrode 141 and the first lead electrode 123 formed therebetween are formed of a first MIM. The second insulating layer 152, the second contact electrode 142 and the second lead electrode 124, which form the diode D1, are formed to form the second MIM diode D2. The first and second MIM diodes have a very non-linear current-voltage characteristic of the thin films of the first and second insulating layers 151 and 152, and thus the threshold voltages are formed through the first and second scan signal lines 121 and 122. Only when the above voltage is applied, the voltage is applied to the pixel. On the other hand, when the signal is not transmitted, the resistance of the MIM diode is large, and the voltage delivered to the pixel is formed on the opposing substrate and the pixel electrode 190 facing each other with the liquid crystal layer interposed therebetween until the next driving voltage is applied. And a liquid crystal capacitor formed of data electrode lines 230 (refer to FIG. 1).

As described above, the liquid crystal display device according to the first exemplary embodiment of the present invention using DSD has higher aperture ratio than the conventional liquid crystal display device using the thin film transistor, thereby obtaining higher luminance. There is an advantage that a brightness gain of about to 80% can be further obtained.                     

Meanwhile, since a wide viewing angle technology is essential for a TV, the wide viewing angle problem may be solved by patterning the structure of the pixel electrode of the first embodiment to form a PVA structure.

This embodiment is described in detail below.

A liquid crystal display according to a second exemplary embodiment of the present invention is illustrated in FIGS. 4 and 5. Here, the same reference numerals as in the above-described drawings indicate the same members having the same function.

4 is a layout view of a TFT panel for a liquid crystal display device in a vertical alignment mode according to a second exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line VV ′ of FIG. 4.

First and second pixel electrodes 190a and 190b made of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO) are formed on the insulating substrate 110 made of a transparent insulating material such as glass. have. In this case, the first and second pixel electrodes 190a and 190b may respectively have first and second scan signal lines 121 and 122 and two MIM diodes D1 and D2 extending in the horizontal direction, respectively. Are electrically connected to each other. In the reflective liquid crystal display, the first and second pixel electrodes 190a and 190b may be formed of a material such as aluminum or silver having excellent reflection characteristics instead of a transparent material.

More specifically, in the thin film diode display panel for liquid crystal display according to the exemplary embodiment of the present invention, the first and second scan signal lines 121 and 122 for transmitting a scan signal or a gate signal on the transparent insulating substrate 110 are pixels. It extends transversely to the top and bottom of the area. Directions in which the first and second lead electrodes 123 and 124, which are connected to the first and second scan signal lines 121 and 122 in a branch, face each other from the first and second scan signal lines 121 and 122. Is laid out. Here, the first and second scan signal lines 121 and 122 and the first and second lead electrodes 123 and 124 may be made of tantalum (Ta), and may include other low resistance metals.

Each of the first and second lead electrodes 123 and 124 is covered by first and second insulating layers 151 and 152 including tantalum oxide (Ta ₂ O ₅ ) formed thereon. In this case, the thickness of the tantalum oxide (Ta ₂ O ₅ ) thin film is preferably about 50 nm, and the first and second insulating layers 151 and 152 may include an aluminum oxide layer (Al ₂ O ₃ ).

In addition, first and second pixel electrodes 190a and 190b formed of a transparent conductive material and divided into two parts in the unit pixel area are formed on the substrate 110. In this case, the first pixel electrode 190a has first and second contact portions 191a and 192a extending adjacent to the first and second adjacent electrodes 123 and 124, and the second pixel electrode 190b is also provided. Similarly, the first and second contacts 191b and 192b extend adjacent to the first and second adjacent electrodes 123 and 124.

In addition, a central portion of the substrate 110 overlaps the first and second lead electrodes 123 and 124 with the insulating layers 151 and 152 therebetween, and both ends thereof overlap the first and second pixel electrodes 190a, First and second contact electrodes 141 and 142 are connected to the first and second contact portions 191a, 191b, 192a, and 192b of 190b.                     

In the thin film diode panel for a liquid crystal display according to the second exemplary embodiment of the present invention, the first insulating layer 151 and the first contact electrode 141 and the first lead electrode 123 formed therebetween are formed of a first MIM. The second insulating layer 152, the second contact electrode 142 and the second lead electrode 124, which form the diode D1, are formed to form the second MIM diode D2. The first and second MIM diodes have a very non-linear current-voltage characteristic of the thin films of the first and second insulating layers 151 and 152, and thus the threshold voltages are formed through the first and second scan signal lines 121 and 122. Only when the above voltage is applied, the voltage is applied to the pixel. On the other hand, when the signal is not transmitted, the resistance of the MIM diode is large so that the applied voltage delivered to the pixel may face the liquid crystal layer and the first and second pixel electrodes 190a interposed therebetween until the next driving voltage is applied. And a data electrode line 230 (refer to FIG. 1) formed on the opposing substrate.

In the thin film diode panel for the liquid crystal display according to the second exemplary embodiment of the present invention, the first and second contact portions 191a and 192a of the first pixel electrode 190a are formed of the first and second contact electrodes 141 and 142. ) Are different from each other, and areas in which the first and second contact parts 191b and 192b of the second pixel electrode 190b contact the first and second contact electrodes 141 and 142 are different from each other. That is, the area S1 in which the first contact portion 191a of the first pixel electrode 190a contacts the first contact electrode 141 may have a second contact portion 192a of the first pixel electrode 190a. The area S3 is smaller than the area S2 in contact with the electrodes 141 and 142, whereas the area S3 in which the first contact portion 191b of the second pixel electrode 190b is in contact with the first contact electrode 141 is the second. The second contact portion 192b of the pixel electrode 190b is larger than the area S4 in contact with the second contact electrode 142. Therefore, even if a signal inverted from each other through the first and second scan signal lines 123 and 124 is applied to the first and second pixel electrodes 190a and 190b, the substantially transmitted signal has a different resistance. Since D1 and D2 are experienced, the effective pixel voltages transmitted to the first pixel electrode 190a and the second pixel electrode 190b are different. When the data voltage is applied through the data electrode line, the first and second pixel electrodes are different. Different subfields are formed in the two subpixels A and B on which 190a and 190b are formed. This will be described in detail later with an equivalent circuit diagram. At this time, the voltage difference can be freely adjusted by adjusting the contact area (S1, S2, S3, S4) or the resistance of the MIM diode (D1, D2) including the same, it is preferably in the range of 0.3 to 1.5V. In this case, the contact areas S1, S2, S3, and S4 do not have to be different in order to adjust the voltage difference, and the method of changing the effective pixel voltages transmitted to the two subpixels A and B may be at least two. Only the contact area may be different, and the first and second MIM diodes are adjusted by adjusting the overlapping area of the first and second lead electrodes 123 and 124 and the first and second contact electrodes 151 and 152 as well as the contact resistance. The resistance of (D1, D2) can be adjusted differently. In the embodiment of the present invention, the contact resistance is included in the resistance of the MIM diode and described together.

As such, when two pixel electrodes having different voltages are disposed in one pixel area, the voltages applied to the two subpixel electrodes compensate for each other, thereby reducing distortion of the gamma curve.

On the other hand, in the second embodiment of the present invention, the liquid crystal display of the vertical alignment mode is excellent in contrast ratio, but a narrow viewing angle is an important disadvantage. In order to overcome this disadvantage, there is a method of aligning liquid crystal molecules perpendicularly to the upper and lower display panels to form a viewing angle and forming a constant cut pattern on the pixel electrode and the data electrode line or forming protrusions on the opposite display panel.

As a method of forming the incision pattern, there is a method of widening the viewing angle by forming incision patterns on the pixel electrode and the data electrode line, respectively, and adjusting the direction in which the liquid crystal molecules lie down using a fringe field formed by the incision patterns. .

The protrusions are formed by forming protrusions on the pixel electrodes and the data electrode lines formed on the upper and lower display panels, respectively, to adjust the lying direction of the liquid crystal molecules using an electric field distorted by the protrusions.

In another method, an incision pattern is formed on the pixel electrode formed on the lower display panel, and a projection is formed on the data electrode line formed on the opposing display panel so that the liquid crystal lies down using a fringe field formed by the incision pattern and the projection. There is a way to form a domain by controlling.

In the third embodiment of the present invention, a method of forming an incision pattern on the pixel electrode and the data electrode line will be described in detail as an example.

6 is a layout view illustrating a structure of a unit pixel in a vertical alignment mode liquid crystal display according to a third exemplary embodiment of the present invention, and FIG. 7 is a cross-sectional view taken along the line 'VIII' of FIG. 6.                     

As shown in FIGS. 6 and 7, the first and second scan signal lines 121 and 122, the first and second lead electrodes 123 and 124, and the first and second scan signal lines formed on the thin film diode display panel 200, which is a lower display panel. Most structures of the first and second contact electrodes 141 and 142 and the like are the same as those of FIGS. 4 and 5.

However, the cutouts 193 of the first pixel electrode 190a and the second pixel electrode 190b are formed in an inequality (<) shape.

The opposing display panel 200 facing the thin film diode display panel includes red, green, and blue color filters 220 sequentially formed in the pixel area on the insulating substrate 210 facing the thin film diode display panel 100. The color filter 220 is not formed in the white pixel area. In addition, a data electrode line 230 formed of a transparent conductive material such as ITO or IZO intersects the first and second scan signal lines 121 and 122 and defines a pixel area on the upper portion of the color filter 220. 230 is formed. In the data electrode line 230, cutouts 231, 232, 233, and 234 parallel to the cutouts 193 of the first and second pixel electrodes 190a and 190b are formed.

In this case, although not shown in the drawings, the opposing display panel 200 may include a black matrix having an opening in the pixel area, and may be formed in a portion overlapping the cutouts 231, 232, 233, and 234. This is to prevent light leakage caused by the cutouts 231, 232, 233, and 234.

When the thin film diode display panel and the opposing display panel having the above structure are aligned and combined, and the liquid crystal material 300 is injected and vertically aligned therebetween, the basic structure of the liquid crystal display according to the third embodiment of the present invention is provided.

When the thin film transistor array panel and the opposing display panel are aligned, the pair of cutouts 231, 232, 233, and 234 of the data electrode line 230 move the first and second pixel electrodes 190a and 190b to the subregion. In this embodiment, the portion of the liquid crystal layer 3 between the subregions is referred to as a subregion in the future, and these subregions correspond to the average major axis direction of the liquid crystal molecules 310 located therein when an electric field is applied. Therefore, divided orientation is divided into four kinds.

In the liquid crystal display according to the third exemplary embodiment of the present invention, the viewing angle can be improved by dividing the liquid crystal molecules in the pixel region.

In this case, as described above, the cutouts 231, 232, 233, and 234 formed in the data electrode line 230 of the opposing display panel 200 may be replaced with a protrusion pattern, and in this case, the data electrode line 230. Has the advantage of reducing the wiring resistance.

Meanwhile, in the first to third embodiments of the present invention, only the vertical alignment mode in which the liquid crystal molecules are vertically oriented with respect to two display panels facing each other is mentioned. However, as in the embodiment of the present invention, the MIM thin film diode is referred to as a DSD. The method of dividing the pixel area so that different voltages are applied when the pixels are connected in a manner to drive the pixels is arranged in parallel with respect to the two display panels, and is a twisted nema arranged in a spiral twisted from the lower display panel to the upper display panel. The same applies to liquid crystal displays having other arrangements, such as a twisted nematic method or an optically compensated bend (OCB) method that is symmetrical with respect to the center plane of the two display panels and has a bent arrangement.

Next, as described above, the liquid crystal display according to the exemplary embodiment of the present invention will be described in more detail.

8 is an equivalent circuit diagram of a unit pixel structure of a liquid crystal display according to an exemplary embodiment of the present invention in which a MIM thin film diode display panel is applied by a DSD method. Here, reference numerals are used in the same manner as in the second and third embodiments.

As shown in FIG. 8, in the liquid crystal display according to the second and third embodiments of the present invention, first and second scan signal lines 121 and 122 are formed in the horizontal direction in the unit pixel, and in the vertical direction. The data electrode line 230 is formed. Each unit pixel is divided into two sub-pixels, and the divided sub-pixels are formed with first and second pixel electrodes 190a and 190b, and the first and second pixel electrodes 190a and 190b and Between the data electrode lines 230, first and second liquid crystal capacitors C _LCA and C _LCB having a liquid crystal material layer 300 (see FIG. 7) as a dielectric are provided. The first and second scan signal lines 121 and 122 and the first pixel electrode 190a are connected through MIM diodes having different contact resistances and different sizes, and the first and second scan signal lines 121 and 122 and the second pixel electrode ( 190b) is also connected via different contact resistances and MIM diodes of different sizes. Here, reference numerals of the MIM diode including the contact resistance are indicated by R1, R2, R3, and R4.

Since the magnitudes of the resistors R1, R2, R3, and R4 of the MIM diodes connected to each of the first and second pixel electrodes 190a and 190b are different from each other, voltages of opposite polarity and the same magnitude in any frame may be Even when Vs1 and Vs2 are applied, different voltages are transmitted to the first and second pixel electrodes 190a and 190b, and a difference occurs in the voltages transmitted to the first and second pixel electrodes 190a and 190b. On the other hand, when the inverted signal is transmitted through the first and second scan signal lines 121 and 123 in the next frame, the voltage transmitted through the data electrode line 230 is also inverted and applied, so that the voltage applied to the liquid crystal is different from the previous frame. Voltages of the same magnitude and opposite signs are applied. Therefore, a gamma curve representing the transmittance with respect to the gray scale voltage appears double in one pixel. At this time, the observer from the front view the image through the gamma curve of the average value, the side can feel the image by the compensation of the gamma curve that does not cause distortion among the gamma curve appearing in the double can improve the visibility in the side.

Meanwhile, the liquid crystal display according to the exemplary embodiment of the present invention may have a pixel array structure having a checkerboard structure, in addition to the stripe structure as in the first to third embodiments.

A liquid crystal display according to a fourth embodiment of the present invention is shown in FIG. 9. Here, the same reference numerals as in the above-described drawings indicate the same members having the same function.

9 is a diagram illustrating a pixel array structure of a liquid crystal display according to a fourth exemplary embodiment of the present invention.

As illustrated in FIG. 9, in the liquid crystal display according to the fourth exemplary embodiment, red, green, blue, and white pixels forming one dot are arranged adjacent to each other over two pixel rows. For example, green and blue pixels or red and white pixels are sequentially arranged in the row direction, and green and red pixels or blue and white pixels are sequentially arranged in the column direction. Here, it is preferable that the green pixels and the white pixels are not disposed adjacent to each other.

In the pixel array structure according to the fourth embodiment of the present invention, red, green, blue, and white pixels formed over two pixel rows are used as "dots" which are basic units for displaying an image. Therefore, similarly to the first to third embodiments, the overall transmittance of one dot is about 1.5 times higher than that of the conventional liquid crystal display by the transmittance of the white pixel.

The structure of the thin film diode display panel of the liquid crystal display device according to the fourth embodiment of the present invention having such a pixel arrangement is easy to those skilled in the art from the pixel arrangement described above and the structure and cross section described in the first to third embodiments above. The detailed description is omitted here.

Meanwhile, the liquid crystal display according to the exemplary embodiment of the present invention may have a pentile arrangement structure by a rendering driving method in addition to the same structures as the first to fourth embodiments.

A liquid crystal display according to a fourth embodiment of the present invention is shown in FIG. 10. Here, the same reference numerals as in the above-described drawings indicate the same members having the same function.

10 is a diagram illustrating a pixel array structure of a liquid crystal display according to a fifth exemplary embodiment of the present invention.

In the liquid crystal display having the pixel arrangement, four-color rendering is driven to improve the resolution. When a specific pixel is driven to display an image having a specific shape, the same effect as driving a specific pixel is driven by driving peripheral pixels around a specific pixel to be driven without driving only a specific pixel. It's the rendering drive that makes it look natural.

As shown in FIG. 10, in the liquid crystal display according to the fifth exemplary embodiment of the present invention, the blue pixels B and the white pixels W disposed adjacent to each other in the same pixel column, and the blue pixels B and In the conventional liquid crystal display device in which four pixels of the red pixel R and the green pixel G arranged left and right about the white pixel W are defined as one dot, the position of the red pixel R is specified. When the gray scale should be displayed, a specific gray scale is displayed by driving all of the other green pixels G1, G2, G3, and G4, the blue pixel B1, and the white pixel W1 which are positioned around the red pixel R. do.

In the rendering driving, since the blue pixel B has a minimal effect on the resolution, the pixel voltage is applied only to the red pixel R and the green pixel G. That is, since the blue pixel B has little effect on the resolution, the pixel voltage applied to the red or green pixel G is set and applied under the condition that the area of the blue pixel B is ignored during the driving of the rendering.

The structure of the thin film diode display panel of the liquid crystal display device according to the fifth embodiment of the present invention having such a pixel arrangement is determined by those skilled in the art from the pixel arrangement described above, and the structure and cross section described in the first to third embodiments above. Since it can be devised easily, detailed description is omitted here.

Meanwhile, the liquid crystal display according to the exemplary embodiment of the present invention may have a pen tile arrangement structure using a two-color rendering driving method in addition to the same structures as the first to fifth embodiments.

A liquid crystal display according to a sixth embodiment of the present invention is shown in FIG. Here, the same reference numerals as in the above-described drawings indicate the same members having the same function.

11 is a diagram illustrating a pixel array structure of a liquid crystal display according to a sixth exemplary embodiment of the present invention.

As illustrated in FIG. 11, in the liquid crystal display according to the sixth embodiment of the present invention, a dot formed of a red pixel R, a green pixel G, and a blue pixel B is formed by a first dot 51 and a red color. A dot consisting of the pixel R, the green pixel G, and the white pixel W is defined as a second dot 52. In the first dot 51, a red pixel R, a green pixel G, and a blue pixel B are sequentially arranged, and the second dot 52 is a white pixel W, a green pixel G, and The blue pixels B are sequentially arranged.

The first dot 51 and the second dot 52 are sequentially arranged in the first pixel row 1X. That is, the red pixels R, the green pixels G, the blue pixels B, the red pixels R, the green pixels G, and the white pixels W are sequentially arranged in a left to right direction.

The second pixel row 2X adjacent to the first pixel row 1X is arranged in such a manner that the first pixel row 1X moves in the row direction by one dot compared with the first pixel row 1X. That is, the second dot 52 and the first dot 51 are sequentially arranged in the second pixel row 2X adjacent to the first pixel row 1X. That is, the red pixels R, the green pixels G, the white pixels W, the red pixels R, the green pixels G, and the blue pixels B are sequentially arranged in a left to right direction.

Therefore, the red pixel R is disposed in the second pixel row 2X corresponding to the same pixel column as the red pixel R of the first pixel row 1X, and the green pixel G of the first pixel row 1X is disposed. The green pixel G is disposed in the second pixel row 2X corresponding to the same pixel column. The white pixel W is disposed in the second pixel row 2X corresponding to the same pixel column as the blue pixel B of the first pixel row 1X, and the white pixel W of the first pixel row 1X is disposed. ), A blue pixel B is disposed in the second pixel row 2X corresponding to the same pixel column.

Unlike the four-color rendering as in the fifth embodiment of the present invention, in the case of the liquid crystal display device in the sixth embodiment of the present invention, the red and green resolutions are maintained as they are. Thus, there is no need for four color rendering to reduce the drive circuitry or increase the resolution. However, the number of the blue pixels B and the white pixels W is 1/2 of the number of the red pixels R or the number of the green pixels G, so that the numbers of the blue pixels B and the white pixels W are the same. Perform two-color rendering on

The structure of the thin film diode display panel of the liquid crystal display according to the sixth embodiment of the present invention having such a pixel arrangement is easy to those skilled in the art from the pixel arrangement described above, and the structure and cross section described in the first to third embodiments above. The detailed description is omitted here.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

The liquid crystal display according to the present invention has an advantage of improving side visibility and improving luminance by using the RGBW method in the DSD method.

Claims (18)

Bottom substrate, A first signal line formed on the lower substrate, A second signal line formed on the lower substrate and formed in parallel with the first signal line; First and second diodes connected to the first signal line and the second signal line, respectively; A thin film diode display panel formed on the lower substrate and including a pixel electrode connected to the first and second diodes; An upper substrate facing the lower substrate, A color filter formed on the lower substrate, A color filter display panel formed on the color filter and including a data electrode line intersecting the first and second signal lines; And a liquid crystal layer injected between the thin film diode display panel and the color filter display panel. And a dot composed of red pixels, green pixels, blue pixels, and white pixels corresponding to the pixel electrodes are continuously arranged. In claim 1, The first and second diodes may include a first lead electrode extending from the first signal line and a second lead electrode extending from the second signal line; First and second insulating layers covering the first and second lead electrodes, respectively; One end is formed on the first insulating film and the second insulating film, and the other end thereof includes: a first contact electrode and a second contact electrode connected to the pixel electrode; Liquid crystal display comprising a. Bottom substrate, A first signal line formed on the lower substrate, A second signal line formed on the lower substrate and formed in parallel with the first signal line; A plurality of diodes connected to the first signal line and the second signal line, respectively; A thin film diode display panel formed on the lower substrate and divided into two parts through a first cutout and including first and second pixel electrodes connected to the plurality of diodes; An upper substrate facing the lower substrate, A color filter formed on the lower substrate, A color filter display panel formed on the color filter and including a data electrode line intersecting the first and second signal lines; A liquid crystal layer injected between the thin film diode display panel and the color filter display panel; And a dot composed of red pixels, green pixels, blue pixels, and white pixels corresponding to the pixel electrodes are continuously arranged. In claim 3, And the data electrode line has a plurality of cutouts or protrusions for dividing at least two pixels into at least two digesters together with the first cutout. In claim 4, The diode is a MIM diode. In claim 5, The MIM diode may include first and second insulating electrodes connected to the first and second signal lines, first and second insulating layers covering the first and second incoming electrodes, and a portion of the first and second insulating layers. And four MIM diodes each having first and second contact electrodes overlapping the first and second lead electrodes and connected to the first and second pixel electrodes, respectively. The method of claim 1 or 3, The red pixel is defined as a red color filter, the green pixel is a green color filter, and the blue pixel is defined as an area where a blue color filter is formed, and the white pixel is defined as an area where no color filter is formed. Device. In claim 7, A red, green, blue, and white pixel are arranged in a row direction, and pixels of the same color are arranged in a column direction. Bottom substrate, A first signal line formed on the lower substrate, A second signal line formed on the lower substrate and formed in parallel with the first signal line; First and second diodes connected to the first signal line and the second signal line, respectively; A thin film diode display panel formed on the lower substrate and including a pixel electrode connected to the first and second diodes; An upper substrate facing the lower substrate, A color filter formed on the lower substrate, A color filter display panel formed on the color filter and including a data electrode line intersecting the first and second signal lines; And a liquid crystal layer injected between the thin film diode display panel and the color filter display panel. Green, red, blue, and white pixels corresponding to the pixel electrode are arranged adjacent to each other over two pixel rows, wherein the four pixels form one dot for displaying an image. In claim 9, The first and second diodes may include a first lead electrode extending from the first signal line and a second lead electrode extending from the second signal line; First and second insulating layers covering the first and second lead electrodes, respectively; One end is formed on the first insulating film and the second insulating film, and the other end thereof includes: a first contact electrode and a second contact electrode connected to the pixel electrode; Liquid crystal display comprising a. Bottom substrate, A first signal line formed on the lower substrate, A second signal line formed on the lower substrate and formed in parallel with the first signal line; A plurality of diodes connected to the first signal line and the second signal line, respectively; A thin film diode display panel formed on the lower substrate and divided into two parts through a first cutout and including first and second pixel electrodes connected to the plurality of diodes; An upper substrate facing the lower substrate, A color filter formed on the lower substrate, A color filter display panel formed on the color filter and including a data electrode line intersecting the first and second signal lines; And a liquid crystal layer injected between the thin film diode display panel and the color filter display panel. Green, red, blue, and white pixels corresponding to the pixel electrode are arranged adjacent to each other over two pixel rows, wherein the four pixels form one dot for displaying an image. Bottom substrate, A first signal line formed on the lower substrate, A second signal line formed on the lower substrate and formed in parallel with the first signal line; First and second diodes connected to the first signal line and the second signal line, respectively; A thin film diode display panel formed on the lower substrate and including a pixel electrode connected to the first and second diodes; An upper substrate facing the lower substrate, A color filter formed on the lower substrate, A color filter display panel formed on the color filter and including a data electrode line intersecting the first and second signal lines; And a liquid crystal layer injected between the thin film diode display panel and the color filter display panel. A liquid crystal display device in which one pixel is formed of four pixels, a blue pixel and a white pixel, which are disposed adjacent to each other in the same pixel column, and a red pixel and a green pixel, which are arranged left and right around the blue pixel and the white pixel. Bottom substrate, A first signal line formed on the lower substrate, A second signal line formed on the lower substrate and formed in parallel with the first signal line; A plurality of diodes connected to the first signal line and the second signal line, respectively; A thin film diode display panel formed on the lower substrate and divided into two parts through a first cutout and including first and second pixel electrodes connected to the plurality of diodes; An upper substrate facing the lower substrate, A color filter formed on the lower substrate, A color filter display panel formed on the color filter and including a data electrode line intersecting the first and second signal lines; And a liquid crystal layer injected between the thin film diode display panel and the color filter display panel. A liquid crystal display device in which one pixel is formed of four pixels, a blue pixel and a white pixel, which are disposed adjacent to each other in the same pixel column, and a red pixel and a green pixel, which are arranged left and right around the blue pixel and the white pixel. Bottom substrate, A first signal line formed on the lower substrate, A second signal line formed on the lower substrate and formed in parallel with the first signal line; First and second diodes connected to the first signal line and the second signal line, respectively; A thin film diode display panel formed on the lower substrate and including a pixel electrode connected to the first and second diodes; An upper substrate facing the lower substrate, A color filter formed on the lower substrate, A color filter display panel formed on the color filter and including a data electrode line intersecting the first and second signal lines; And a liquid crystal layer injected between the thin film diode display panel and the color filter display panel. A dot consisting of a red pixel, a green pixel, and a blue pixel corresponding to the pixel electrode may be referred to as an odd number and an even number of the second dot, M, and N, respectively. time, A first dot and a second dot are sequentially arranged in the M-th pixel row, and the N-th pixel row adjacent to the M-th pixel row moves the M-th pixel row by the dot in the row direction compared to the M-th pixel row. Arranged in one form, And a pixel group consisting of the Mth pixel row and the Nth pixel row. Bottom substrate, A first signal line formed on the lower substrate, A second signal line formed on the lower substrate and formed in parallel with the first signal line; A plurality of diodes connected to the first signal line and the second signal line, respectively; A thin film diode display panel formed on the lower substrate and divided into two parts through a first cutout and including first and second pixel electrodes connected to the plurality of diodes; An upper substrate facing the lower substrate, A color filter formed on the lower substrate, A color filter display panel formed on the color filter and including a data electrode line intersecting the first and second signal lines; And a liquid crystal layer injected between the thin film diode display panel and the color filter display panel. When the dot consisting of the red pixel, the green pixel, and the blue pixel corresponding to the pixel electrode is a dot consisting of the first dot, the red pixel, the green pixel, and the white pixel, the second dot, M, N are odd and even, respectively. A first dot and a second dot are sequentially arranged in the M-th pixel row, and the N-th pixel row adjacent to the M-th pixel row moves the M-th pixel row by the dot in the row direction compared to the M-th pixel row. Arranged in one form, And a pixel group consisting of the Mth pixel row and the Nth pixel row. The method of claim 14 or 15, The first dot is a red pixel, a green pixel and a blue pixel are arranged in sequence, the second dot is a red pixel, a green pixel and a white pixel are arranged in sequence. The method of claim 14 or 15, The first dot is a red pixel, a blue pixel and a green pixel are arranged in sequence, the second dot is a red pixel, a white pixel and a green pixel are arranged in sequence. The method of claim 14 or 15, And a blue pixel and a white pixel of the liquid crystal display are driven to render.

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