CN1979298A

CN1979298A - Liquid crystal display and color filter array plate

Info

Publication number: CN1979298A
Application number: CNA2006101712140A
Authority: CN
Inventors: 宋根圭; 崔井乂; 卢南锡; 洪雯杓; 朴哲佑
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Display Co Ltd
Priority date: 2002-05-04
Filing date: 2003-05-04
Publication date: 2007-06-13
Anticipated expiration: 2023-05-04
Also published as: CN100470328C; KR100825105B1; KR20030086399A

Abstract

This liquid crystal display includes a liquid crystal display panel having a red filter having red pixels, a green filter having green pixels, a blue filter having blue pixels and white pixels W; and a back light unit disposed in one side of the panel. Light emitted from the back light unit has x-color coordinates ranging from 0.31 to 0.34, and y-color coordinates from 0.32 to 0.35.

Description

LCD and filtering color picec array board thereof

The application is is on May 4th, 2003 applying date, be entitled as the dividing an application of No. 03127473.0 application for a patent for invention of " LCD and filtering color picec array board thereof ".

Technical field

The present invention relates to a kind of LCD and used display board, particularly four-color liquid crystal display.

Background technology

Generally speaking, LCD (LCD) comprising: liquid crystal display board component (liquid crystal panelassembly), and it comprises and is provided with for example two boards of two kinds of field generating electrodes of pixel electrode and public electrode; And be clipped in the liquid crystal layer that the anisotropy dielectric properties are arranged between the two boards.Voltage difference between the generating electrodes of field changes, that is, the electric field intensity that is produced by electrode changes, and causes that the light transmission that passes LCD changes, therefore, and the image that the voltage difference between the control electrode can obtain to stipulate.

LCD includes pixel electrode and red (R), green (G), a plurality of pixels of blue (B) look color filter (color filter).Drive pixel by the signal that applies by display signal line and carry out display operation.Signal wire comprises the grid line (gate line) (or scan signal line) that carries sweep signal and the data line of carry data signals.Each pixel has the thin film transistor (TFT) (TFT) that is connected to a grid line and a data lines, is added to the data-signal of pixel electrode with control.

Represent the optical efficiency of existing LCD of a point poor with 3 RGB color pixels.Specifically, the color filter that is used for each rgb pixel only sees through 1/3 of incident light, and therefore, total optical efficiency is poor.

Thereby, several red (R) arranged, green (G), the arrangement of blue (B) look color filter.For example: bar shaped is arranged, and wherein the color filter that color is identical is arranged in the same pixel column; Mosaic shape is arranged, and wherein red, green, blue look color filter is along the row and column series arrangement; δ-type, wherein pixel toothing on column direction is arranged, and red, green, blue look color filter series arrangement.δ-shape is represented circle or diagonal line exactly.

Clair Voyante laboratory proposes " PenTile Matrix of a kind of being called ^TM" the pixel arrangement mode, its advantage be can high resolution displayed image, and can make design cost reach minimum.During this pixel was arranged, blue unit pixel was shared by two points, and contiguous blue pixel receives from the data-signal of a data drive IC and by two different gate driving IC and drives.Use the PenTileMatrix dot structure, can use super video graphics array (SVGA) level display to realize the high definition of super large pattern matrix (UXGA) level.In addition, increase the quantity of gate driving IC cheaply, reduced the quantity of expensive data-driven IC.Thereby make the cost of display drop to minimum.

Yet, with PenTile Matrix dot structure, because the varying in size of the size of blue pixel and red and green pixel, so require replacement memory capacity because of the liquid crystal charge rate is different.In addition, owing to drive two blue pixel with single line, so pixel polarity is inconsistent.

Particularly when blue pixel is arranged in bar shaped, the vertical line charting deformation that is caused by blue pixel gets easily to be seen, and sharpness is not enough, and this has reduced total picture quality.

Summary of the invention

A kind of LCD is provided, and it comprises: the liquid crystal display board component that a plurality of red, green, blues and white pixel district are arranged; With the back light unit of the side that is placed on the liquid crystal display board component, wherein, the light of back light unit emission have color coordinates (color coordinate) (x, y), the scope of x is about 0.31 to about 0.34, the scope of y is about 0.32 to about 0.35.

The liquid crystal display board component comprises: first dielectric substrate; The a plurality of thin film transistor (TFT)s that form on first dielectric substrate; That form on first dielectric substrate and be connected to thin film transistor (TFT) a plurality of pixel electrodes; Second dielectric substrate in the face of first dielectric substrate; Be formed on second dielectric substrate and limit the black matrix of pixel region; Basically be formed on the red, green and blue look color filter in the red, green and blue color pixel district respectively; Be formed on the public electrode on the color filter; And be clipped in liquid crystal layer between first and second dielectric substrate.

The area in blue pixel district or white pixel district is less than the area in red pixel district and green pixel district.

Preferably, the total area in blue pixel district and white pixel district is identical with the area in any one district in red pixel district and the green pixel district basically.

Near the width of the black matrix the white pixel district is preferably wide than near the width of the black matrix other pixel regions.

A kind of filtering color picec array board that is used for LCD is provided, and it comprises: dielectric substrate; Be formed on the dielectric substrate and limit red, green, blue and the black matrix in white pixel district; Basically be formed in the red, green, blue color pixel district respectively and contain the organic color filter of red, green, blue of red, green, blue pigment; Basically be formed on the transparent organic color filter in the white pixel district; With the public electrode that is formed on organic color filter.

Filtering color picec array board also comprises the coating (overcoat) between organic color filter and public electrode.

Transparent organic color filter can comprise and the coating identical materials.

Preferably, the surface elevation of coating is roughly consistent.

LCD is provided, and it comprises: first dielectric substrate; The a plurality of thin film transistor (TFT)s that form on first dielectric substrate; The protective seam that projection is arranged that forms on the thin film transistor (TFT); That form on the protective seam and be connected to a plurality of pixel electrodes of thin film transistor (TFT); Second dielectric substrate of facing with first dielectric substrate; That form on second dielectric substrate and be used to limit the black matrix in red, green, blue and white pixel district; Basically be formed on the red, green and blue look color filter in the red, green and blue color pixel district respectively; Be formed on the public electrode on the color filter; And be clipped in liquid crystal layer between first and second dielectric substrate, and wherein, the height of public electrode is less than the height at the public electrode in red, green and blue color pixel district in the white pixel district, and the projection of protective seam is in the face of the white pixel district.

Distance between public electrode and the protective seam surface is basically identical preferably.

Pixel electrode and public electrode can have otch (cutout).

A kind of LCD is provided, it comprises: an array of organizing pixel more, every group of pixel comprises blue pixel adjacent one another are and white pixel, strides across blue pixel and the oblique each other right a pair of red pixel of white pixel and strides across blue pixel and white pixel and the each other oblique right pair of green pixel adjacent with red pixel that each pixel comprises pixel electrode and thin film transistor (TFT); Be used to carry the many piece grid lines of signal by what line direction extended to pixel; With extend by column direction and be used to carry data-signal to arrive many data lines of pixel.

The relative position of adjacent two groups of pixel Smalt pixels and white pixel is preferably opposite in column direction or line direction.

Press embodiments of the invention, pixel has rectangular shape, and blue pixel and white pixel are pressed column direction and arranged to form row (separate column) separately.

By another embodiment of the present invention, blue pixel and white pixel are leg-of-mutton, and with the formation rhombus, and line direction is pressed in the boundary line between blue pixel and the white pixel or column direction extends.

Preferably, red pixel in adjacent two row is arranged in different row, and the red pixel in those adjacent lines is arranged in different row, wherein, green pixel in adjacent two row is arranged in different row, and the green pixel in the adjacent lines is arranged in different row, and wherein, blue pixel on the line direction in the two adjacent groups pixel or white pixel are arranged in different row, or the blue pixel in the two adjacent groups or white pixel are arranged in different row on the column direction.

Can drive LCD by draw (rendering).

Description of drawings

Description of the preferred embodiment of the present invention in conjunction with the drawings, the above-mentioned advantage with other of the present invention will become clearer, wherein:

Fig. 1 is the cross-sectional view by the LCD of the embodiment of the invention;

Fig. 2 to 5 is that the color filter that the LCD by the embodiment of the invention uses is arranged synoptic diagram;

Fig. 6 is the schematic spectral curve that shows by the light source of the embodiment of the invention;

Fig. 7 and 8 is cut-open views of the filtering color picec array board used of the LCD by the embodiment of the invention;

Fig. 9 is the response time of LCD and the function relation curve figure between its display unit gap (cell gap);

Figure 10 is the cut-open view by the LCD of another embodiment of the present invention;

Figure 11 lists intention to the line of pixels of the LCD of 13 embodiment of the invention;

Figure 14 is the picture that the visibility of the LCD that pixel shown in Figure 11 arranges is arranged;

Figure 15 and 17 is respectively the Butut of the tft array plate used of the LCD by the embodiment of the invention, and Figure 16 and 18 is respectively the cut-open view of the tft array plate shown in Figure 15 and 17 of cutting open of XVI-XVI ' along the line and XVIII-XVIII ';

Figure 15 is the Butut of the tft array plate used by the LCD that having of embodiment of the invention pixel shown in Figure 11 is arranged;

Figure 16 is the cut-open view of the tft array plate shown in Figure 15 cut open of XVI-XVI ' along the line;

Figure 17 is the Butut of the tft array plate used by the LCD that having of embodiment of the invention pixel shown in Figure 12 is arranged; And

Figure 18 is the cut-open view of the tft array plate shown in Figure 17 cut open of XVIII-XVIII ' along the line.

Embodiment

Below referring to the accompanying drawing that shows the preferred embodiment of the present invention the present invention is described more fully.

For clearer, has all amplified in layer thickness and zone in the accompanying drawing.Identical Reference numeral indication components identical.Should be appreciated that, when the element of for example saying layer, zone or substrate is " on other element ", can be these elements directly on other elements or intermediary element also can exist.On the contrary, when saying element " directly on other elements ", then expression does not have the element of insertion.

Referring now to accompanying drawing, describes the LCD that presses the embodiment of the invention in detail.

Fig. 1 is the cross-sectional view by the LCD of the embodiment of the invention.Fig. 2 to 5 shows the arrangement of the color filter of the LCD that presses embodiments of the invention.

As shown in Figure 1, LCD comprises: lower plate 100 in the face of the upper plate 200 of lower plate 100, and is clipped between lower plate and the upper plate and comprises the liquid crystal layer 3 of the liquid crystal molecule of aiming at by predetermined direction.LCD also comprises upper and lower polariscope 12 and 22, upper and lower compensate film 13 and 23 and back light unit 350.Liquid crystal molecular orientation changes during added electric field.Transmittance changes with liquid crystal molecular orientation.

Lower plate 100 comprises: preferably use for example following substrate 110 of the transparent insulation material formation of glass, a plurality of thin film transistor (TFT)s (TFT) that form on the following substrate 110 and be connected to TFT and preferably use for example a plurality of pixel electrodes 190 of the transparent conductive material formation of tin indium oxide (ITO) and indium zinc oxide (IZO).Each TFT conversion is added to the data voltage of pixel electrode 190.

Following compensate film 13 and polarizer 12 attach to down on the outside surface of substrate 110.Following compensate film 13 has biaxiality or uniaxiality.Can omit down compensate film 13.

Upper plate 200 comprises: preferably use for example last substrate 210 of the transparent insulation material formation of glass, limit black matrix 220 by a plurality of pixel regions of arranged, be formed on a plurality of red, green, blue

look color filter

230R, 230G in the pixel region that limits by

black matrix

220 and 230B and preferably with the public electrode 270 of the transparent conductive material formation of for example ITO and IZO.

Series arrangement red, green, blue

look color filter

230R, 230G and 230B.Pixel region without any red, green, blue

look color filter

230R, 230G and 230B is represented white pixel district W, and it stops or pass through whole components of incident light comparably.Because white pixel district W does not have color filter, so, at the inside surface height of the color filter plate 200 on the white pixel district W inside surface height less than the color filter plate 200 on other R, G, the B pixel region, the display unit gap on white pixel district W is greater than the display unit gap on other pixel regions.

In this instructions, technical term " pixel " is meant the primary functional elements that is used for display image, it comprises pixel electrode 190, a part that faces toward the public electrode 270 of pixel electrode 190, the part of the liquid crystal layer 3 between the appropriate section of pixel electrode 190 and public electrode 270, TFT and

color filter

230R, 230G or 230B.In addition, term " pixel region " is meant the area that pixel occupies.But for convenience, two terms " pixel " and " pixel region " do not have difference ground to use in this manual.

Referring to Fig. 2, red, green, blue is identical with the quantity of white pixel district R, G, B and W.Press line direction series arrangement red, green, blue and white pixel district R, G, B and W.The size of each blue pixel district B and white pixel district W is half of each red pixel district R and green pixel district G.Therefore a blue pixel district B and a white pixel district W sum and a red pixel district R or a green pixel district G are roughly the same.

Referring to Fig. 3, comprise the point of 2 * 3 pel arrays formation of same pixel as the image primary element.First pixel column comprises tactic red, indigo plant and green pixel, and second pixel column comprises tactic green, white and red pixel.

It is identical with pixel shown in Figure 3 arrangement that pixel shown in Figure 4 is arranged, and just blue pixel B has enlarged, and white pixel W has dwindled.

Pixel shown in Figure 5 is arranged and is arranged identical with pixel shown in Figure 3, the part of just surrounding the black matrix B W of white pixel W has enlarged, to have the width wideer than other parts, it is provided with hidden owing to highly different swing offset (disclination) lines that produce.

Last compensate film 23 and analyser 22 attach on the outside surface of substrate 210.Last compensate film 23 has biaxiality or uniaxiality.Can omit compensate film 23.

Back light unit 350 is placed on the back side of polarizer 12.Back light unit 350 is provided with light source 351 and the light guide plate 352 that comprises cold-cathode tube.

In the present embodiment, because a point comprises red, green, blue and white pixel, so the total area that does not increase a little just can improve optical efficiency.

Suppose that the light quantity by polarizer 12 is 1.

With regard to the point of 3 pixels comprising the red, green and blue pixel, the area of each pixel be point the total area 1/3.Because the transmittance of color filter is 1/3, so the total light transmittance of point equals 1/3 * 1/3+1/3 * 1/3+1/3 * 1/3=1/3 ≈ 33.3%.

With regard to point shown in Figure 2, each red and area green pixel is 1/3 of the total area, and each area blue and white pixel is 1/6 of the total area.Because the transmittance of white pixel is 1, and the transmittance of other pixel is 1/3, so the total light transmittance of point equals 1/3 * 1/3+1/3 * 1/3+1/6 * 1/3+1/6 * 1=4/9 ≈ 44.4%.Thereby with existing 3 look LCD ratios, brightness increases to about 1.5 times.

Although the area of blue pixel is less than the area of redness or green pixel,, compare people with green glow not too responsive to the blue light quantitative changeization with ruddiness, so area reduces the influence of picture quality less.

But the blue pixel area reduces to make image to degenerate a little, that is, make image slightly yellow.

In order to overcome this shortcoming, the light blue component of light source 351 emissions increases, to prevent slightly yellow image.

The light of light source 351 emission have color coordinates (x, y), wherein the scope of x is about 0.31 to about 0.34, the scope of y is about 0.32 to about 0.35.The light of the existing LCD back light emission of this light ratio comprises more blue light components.Obtain such light source, the material of the coloured light that turns blue that comprises in light source 351 should increase scheduled volume.

Fig. 6 is the curve of demonstration by the exemplary spectrum of the light source of the embodiment of the invention.Compare with the curve of spectrum of the existing light source of representing with " blue 1 ", curve display with " blue 1.09 " and " blue 1.18 " expression goes out the peak value that increases under about 440-470nm range of wavelength, this scope is represented blue light, and the peak value that reduces under about 620-650nm range of wavelength, and this scope is represented ruddiness.

Simultaneously, because white pixel W do not have color filter, so can see it being that band is blue from the light output of the white pixel W of light source 531.Yet the bigger unit box gap that makes the incident light jaundice of white pixel W has prevented that light from turning blue.

Fig. 7 and 8 is used for the cut-open view of the filtering color picec array board of LCD according to another embodiment of the present invention.

Referring to Fig. 7, filtering color picec array board 200 comprises: transparent insulation substrate 210, be formed on the black matrix 220 of the aperture that a plurality of qualification pixel regions are arranged on the dielectric substrate 210, the a plurality of red, green, blues that form in each pixel region and

clear filter

230R, 230G, 230B and 230W, be formed on the coating 250 on

color filter

230R, 230G, 230B and the 230W and be formed on public electrode 270 on the coating 250.Clear filter 230W preferably comprises transparent organic material, for example unpigmented photochromics.

Filtering color picec array board 200 shown in Figure 8 does not comprise transparent color filter.The ground that replaces, the thickness of the part of coating 250 in white pixel district W is thicker than the thickness of its other parts, causes the difference in height on surface to be equal to or less than 0.2 μ m.Therefore, the display unit gap of all pixels is almost consistent, compare with filtering color picec array board 200 shown in Figure 7, owing to saved the step that forms transparent color filter 230W, so, can make filtering color picec array board 200 with better simply technology.

Filtering color picec array board 200 shown in Fig. 7 and 8 is by being provided with transparent color filter 230W, or the thickness of the coating 250 by increasing white pixel W place, thereby reduced the step difference between white pixel W and other pixel regions R, G and the B.

Step difference reduces to have prevented that with consistent display unit gap white pixel district W from sodium yellow occurring and the swing offset line occurring at the step place.

Preferably, the thickness of display unit gap or liquid crystal layer equals about 3.7 μ m, and the thickness of color filter is about 1.5 to 1.6 μ m.

Fig. 9 is the function relation curve in the display unit gap of response time and LCD.

" on " expression conducting response time among Fig. 9, " off " expression is by the response time.

As shown in Figure 9, along with increasing the response time, the display unit gap reduces.When the display unit gap reached 3.7 μ m, the response time was a minimum value.Along with the display unit gap away from 3.7 μ m, the response time increases once more.

Figure 10 is the cut-open view by the LCD of another embodiment of the present invention.

Referring to Figure 10, comprise: tft array plate, filtering color picec array board 200 and be clipped in liquid crystal layer 3 between them by the LCD of present embodiment.

Filtering color picec array board 200 comprises: the upper plate of being made by the transparent insulation material of for example glass 210 preferably, the qualification that forms on the upper plate 210 is by the black matrix 220 of a plurality of pixel regions of arranged, substantially be arranged in a plurality of red, green and blue

look color filter

230R, 230G and the 230B of pixel region, the coating 250 that on

color filter

230R, 230G and 230B, forms and preferably with constitute and the public electrode 270 that a plurality of otch (cutout) 271 are arranged of transparent conductive material of ITO for example and IZO.

Series arrangement red, green and

blue color filter

230R, 230G and 230B.Do not have any one pixel region among red, green and

blue color filter

230R, 230G and the 230B to represent white pixel district W, it stop with being equal to or by incident light the institute important.Because white pixel district W does not have color filter, so the inside surface of the color filter plate 200 on the white pixel district W forms basin shape structure (basin).

Tft array plate 100 comprises a plurality of gate electrodes 123 that form on the dielectric substrate 110; the gate insulator 140 that forms on the gate electrode 123; the a plurality of semiconductors 154 that preferably with amorphous silicon constitute that on gate insulator 140 form relative with gate electrode 123; the a plurality of ohmic contact layers 163 and 165 that form on the semiconductor 154; be respectively formed at multiple source and

drain electrode

173 and 175 on

ohmic contact layer

163 and 165; covering source and

drain electrode

173 and 175 and the protective seam 180 of a plurality of contact holes 181 that expose drain electrode 175 is arranged and be connected to drain electrode 175 and a plurality of pixel electrodes of a plurality of otch 191 are arranged by contact hole 181.Also be provided with on the tft array plate 100 be connected to gate electrode 123 be used for carry the many grid lines (not having picture) of sweep signal and be connected to many data lines (not having picture) that source electrode 173 is used for carrying to it data-signal to it.

Protrude and the formation boss at white pixel W on the surface of protective seam 180.

The boss of the bathtub construction of filtering color picec array board and tft array plate makes white pixel district W and other pixels that roughly the same display unit gap be arranged toward each other.

By utilization the photoetching of the photomask of translucent areas and clear area and opacity is arranged, form above-mentioned protective seam 180.After deposit protective seam 180 also covered photoresist film thereon, alignment of photomask make clear area and opacity in the face of contact hole 181 and white pixel district W, and translucent areas was in the face of remaining zone.After exposure and the development, remove the part of photoresist film on contact hole 180 to expose the part of protective seam 180, stay the part on the white pixel district W, the thickness of other parts reduces.Form contact hole 181 by carrying out etching as etching mask with photoresist film, and the ashing photoresist film, make and remove the photoresist membrane portions that thickness reduces, expose the part of protective seam 180.Therefore, only stay photoresist membrane portions on white pixel district W.As etching mask etching protective seam 180, make the exposed portions serve of attenuate protective seam 180 with photoresist film, on white pixel district W, to form boss.

Simultaneously, introduce a plurality of lithography steps in the manufacturing of tft array plate 100, and the utilization of photomask that translucent areas and clear area and opacity are arranged has been reduced the quantity of lithography step.Can constitute the several layers of different graphic with photoresist film, this photoresist film has the thickness relevant with the position that utilizes photomask to make.For example, form semiconductor 154,

ohmic contact layer

163 and 165 and source electrode 163 and drain electrode 165 with this photoresist film, therefore, compare, can make tft array plate 100 with less mask with the situation of using the photomask that has only clear area and opacity.In this case, source electrode 163 and drain electrode 165 and ohmic contact layer have essentially identical flat shape, and semiconductor 154 has essentially identical flat shape with source electrode 163 and drain electrode 165 except that channel region.

Tft array plate 100 and filtering color picec array board 200 are aimed to assemble.Then, liquid crystal material 3 be injected between tft array plate 100 and the filtering color picec array board 200 the gap and by homeotropic alignment.Represent the

otch

191 and 271 of pixel region by pixel electrode 190 and public electrode 270 of the part in pixel of liquid crystal layer 3 to be divided into a plurality of farmlands.These farmlands are divided into 4 classes according to the vergence direction of liquid crystal molecule wherein under the situation of added electric field.Multiple farmland can provide wide visual angle.

Figure 11 to 13 demonstrates by the pixel of another embodiment of the present invention and arranges.

Referring to Figure 11 to 13, red, the indigo plant and green pixel R, B and the G that comprise that similar PenTile Matrix arranges by the LCD of present embodiment, and the white pixel W of contiguous blue pixel B.

For ease of describing, the determined pixel group comprises: indigo plant adjacent one another are and white pixel B and W, and a pair of across blue and white pixel B and the oblique each other right red pixel R of W, a pair of across blue and white pixel B and oblique each other right and adjacent with the red pixel R green pixel G of W.Then, the pixel that repeats arrangement acquisition Figure 11 to 13 of this pixel groups is arranged.Notice that the blue pixel B on column direction or on the line direction in adjacent two groups of pixels is opposite with the relative position of white pixel W.

Blue pixel B and white pixel W shown in Figure 11 are rectangles, and be the same with green pixel G with red pixel R, and arrange and formation row separately on column direction.

Perhaps, blue pixel B shown in Figure 12 and 13 and white pixel W are isosceles triangles, and a pair of blue pixel B makes its base relative with white pixel W, form rhombus.Blue pixel B shown in Figure 12 and white pixel W press column direction and arrange, and blue pixel B shown in Figure 13 and white pixel W press the line direction arrangement.Therefore, blue pixel B shown in Figure 12 and the boundary line between the white pixel W and the coupling of the boundary line between the pixel column, and blue pixel B shown in Figure 13 and the boundary line between the white pixel W and the coupling of the boundary line between the pixel column.

Referring to Figure 11 and 12, the blue pixel B on line direction in adjacent two groups of pixels is opposite with the relative position of white pixel W.But referring to Figure 13, the blue pixel B in two groups of adjacent pixels of column direction is opposite with the relative position of white pixel W.

In this arrangement, the red pixel R of adjacent two row is arranged in different row, and the red pixel R in the adjacent lines is arranged in different row.Equally, the green pixel G in adjacent two row is arranged in different row, and the green pixel G in the adjacent lines is arranged in different row.In addition, blue pixel B or white pixel W in the two adjacent groups in the line direction are arranged in different row, shown in Figure 11 and 12; Perhaps, blue pixel B or white pixel W in the two adjacent groups in the column direction are arranged in different row, as shown in figure 13.Therefore, homochromy pixel, particularly blue pixel are arranged by serrate along column direction and line direction.

Press the external data source reception rgb image data of the LCD of these embodiment, and the view data of extraction white pixel W is to drive 4 color pixels from for example image controller.

The point of display image preferably includes above-mentioned pixel groups, and this pixel groups comprises: a pair of blue pixel B and white pixel W, a pair of red pixel R and pair of green pixel G.

But during drawing, point can comprise a pair of blue pixel B and the white pixel W in the row, and a pair of redness and green pixel.

In any case, these pixels are arranged and have been prevented the perpendicular line figure that produces among the existing LCD, press the column direction arrangement such as the same color pixel of blue pixel among this existing LCD, and sharpness are not high enough.Therefore, the LCD that has PenTile Matrix pixel to arrange can improve picture quality.

Figure 14 is the picture that shows the visibility of the LCD that pixel shown in Figure 11 arranges.As shown in figure 14, there is not discernible perpendicular line figure.

Below referring to Figure 15 to 18 the example T FT array board that the LCD have pixel shown in Figure 11 and 12 to arrange uses is described.

Figure 15 and 17 is Bututs of the tft array plate used of the LCD by the embodiment of the invention, and Figure 16 and 18 is respectively the cut-open view of the tft array plate shown in Figure 15 and 17 of cutting open of XVI-XVI ' along the line and XVIII-XVIII '.

Referring to Figure 12, comprise by the LCD of these embodiment: be expert at and column direction on a plurality of red, green, blues and white pixel R, G, B and the W that arrange.

As shown in the figure, grid wiring is formed on the transparent insulation substrate 110.Grid wiring comprises roughly by line direction many grid lines 121 that extend and a plurality of gate electrodes 123 that are connected to grid line 121.The end 125 of every grid line 121 is widened to be connected with external circuit.

Grid wiring is preferably used the metal that low-resistivity is arranged, for example, and aluminium, formations such as silver.

On the whole surface of the substrate that comprises grid wiring, form gate insulator 140.

On gate insulator 140, form a plurality of semiconductor islands 154 that preferably constitute, on semiconductor island 154, form a plurality of ohmic contact layers 163 and 165 that preferably constitute with silicide or n type impurity severe doped amorphous silicon with amorphous silicon.

Ohmic contact layer

163 and 165 and gate insulator 140 on form preferably with the metal that low-resistivity is arranged the data arrange that constitutes such as aluminium, silver for example.

Data arrange comprises: roughly extend and intersect with many data lines 171 of limiting a plurality of pixel regions, as the branch of data line 171 and extend to multiple source electrode 173 on the ohmic contact layer 163 and that separate and be formed on the ohmic contact layer 165 about gate electrode 123 and a plurality of drain electrodes 175 relative with source electrode 173 with source electrode 173 with grid line 121 at column direction.The end 179 of every data lines 171 is widened to be connected with external circuit.

On the exposed portions serve of data arrange and the semiconductor island 154 that do not covered, form passivation layer 180 by data arrange.Passivation layer 180 has a plurality of

contact holes

185 and 189 of the end 179 of exposing drain electrode 175 and data line 171 respectively.Passivation layer 180 and gate insulator 140 have a plurality of contact holes 182 of the end 125 of exposing grid line 121.

Form a plurality of pixel electrodes 190 and a plurality of auxiliary contact (contactassistant) 95 and 97 on the passivation layer 180.Pixel electrode 190 is connected respectively to drain electrode 175 and storage electrode 177 by

contact hole

185 and 187, and

auxiliary contact

95 and 97 is connected to the bared end 125 of grid line 121 and the bared end 179 of data line 171 by

contact hole

182 and 189 respectively.Preferably use the transparent material of ITO (tin indium oxide) for example or IZO (indium zinc oxide) to constitute pixel electrode 190 and

auxiliary contact

95 and 97.

Gate electrode 123, source electrode 173 and drain electrode 175 and semiconductor island 154 form TFT.

Referring to Figure 15 and 16, each pixel R, G, B and W have rectangle same as shown in Figure 11, and the arrangement of grid line 121, gate electrode 123, data line 171 and source electrode 173 and drain electrode 175 also is consistent.Data arrange also comprises a plurality of storage conductors 177 on the expansion that covers grid line 121, and passivation layer 180 also comprises a plurality of contact holes 187 that are used to connect pixel electrode 190 and storage electrode 177.Every grid line 121 has a plurality of expansions that cover on the storage electrode 177, to form holding capacitor.

Referring to Figure 17 and 18, the shape of the shape of the pixel electrode 190 of pixel R, G, B and W and corresponding pixel shown in Figure 12 is similar.On substrate 110, form that extend with grid line 121 almost parallels and many storage lines 131 employing and grid wiring identical materials formation.Grid line 121 and storage line 131 are positioned at the boundary vicinity of pixel column, and pixel electrode 190 and TFT are about storage line 131 symmetric offset spread.Storage line 131 overlaps with adjacent pixel electrodes 190, to form a plurality of holding capacitors.

Referring to Figure 15 to 18, pixel electrode 190 overlaps with grid line 121 and data line 171, so that big aperture opening ratio to be provided.

Although more than describe the preferred embodiments of the present invention in detail, but, the technician of the industry should be appreciated that, also has many variations or improvement on the basis of the principle of the invention, and these variations or improve all belong in the spirit and scope of the present invention that the accompanying Claim book defined.

Claims

1. filtering color picec array board that is used for LCD comprises:

Dielectric substrate;

That form on the dielectric substrate and limit the black matrix in red, green, blue and white pixel district;

Basically be formed in the red, green, blue color pixel district respectively and comprise the red, green, blue look organic color filter of red, green, blue pigment;

Basically form the transparent organic color filter in the white pixel district; And

Be formed on the public electrode on organic color filter.

2. by the filtering color picec array board of claim 1, also comprise the coating between organic color filter and public electrode.

3. by the filtering color picec array board of claim 2, wherein, transparent organic color filter comprises and the coating identical materials.

4. press the filtering color picec array board of claim 1, wherein, the surface elevation basically identical of coating.

5. LCD comprises:

First dielectric substrate;

The a plurality of thin film transistor (TFT)s that form on first dielectric substrate;

That form on the thin film transistor (TFT) and the protective seam of boss arranged;

That form on the protective seam and be connected to a plurality of pixel electrodes of thin film transistor (TFT);

Second dielectric substrate in the face of first dielectric substrate;

That form on second dielectric substrate and limit the black matrix in red, green, blue and white pixel district;

Basically be formed on the red, green and blue look color filter in the red, green and blue color pixel district respectively;

Be formed on the public electrode on the color filter; And

Be clipped in the liquid crystal layer between first dielectric substrate and second dielectric substrate,

Wherein, than medium and small in red, green and blue color pixel district, the boss face in the protective seam is to the white pixel district in the white pixel district for the height of public electrode.

6. by the LCD of claim 5, wherein, between public electrode and the protective seam surface apart from basically identical.

7. by the LCD of claim 5, wherein, pixel electrode and public electrode have otch.

8. LCD comprises:

The array of many group pixels, every group of pixel comprises: blue pixel adjacent one another are and white pixel, across blue pixel and the oblique each other right a pair of red pixel of white pixel, across blue pixel and white pixel each other tiltedly to and the pair of green pixel adjacent with red pixel, each pixel comprises pixel electrode and thin film transistor (TFT);

Be used to carry the many piece grid lines of signal by what line direction extended to pixel; And

Carry data-signal to arrive many data lines of pixel by column direction being used to of extending.

9. by the LCD of claim 8, wherein, column direction or on line direction the relative position of the blue pixel in the two adjacent groups pixel and white pixel opposite.

10. by the LCD of claim 8, wherein, pixel is a rectangular shape, and blue pixel and white pixel are pressed column direction and arranged and formation row separately.

11. by the LCD of claim 8, wherein, blue pixel and white pixel have triangular shaped, to form rhombus.

12. by the LCD of claim 11, wherein, the boundary line between blue pixel and the white pixel presses line direction or column direction extends.

13. LCD by claim 8, wherein, red pixel in adjacent two row is arranged in different row, red pixel in the adjacent lines is arranged in different row, and wherein, the green pixel in adjacent two row is arranged in different row, green pixel in the adjacent lines is arranged in different row, and wherein, blueness or white pixel on the line direction in adjacent two groups of pixels are arranged in different row, or the blueness in the two adjacent groups or white pixel are arranged in different row on the column direction.

14. by the LCD of claim 8, wherein, LCD drives by drawing.