GB2320790A

GB2320790A - Offset pixel arrangement

Info

Publication number: GB2320790A
Application number: GB9727254A
Authority: GB
Inventors: Ho-Nam Yim; Sun-Gil Kwon
Original assignee: Hyundai Electronics Industries Co Ltd
Current assignee: SK Hynix Inc
Priority date: 1996-12-30
Filing date: 1997-12-23
Publication date: 1998-07-01
Anticipated expiration: 2017-12-23
Also published as: TW464781B; GB2320790B; GB9727254D0; JPH10293285A; JP3191093B2; KR100247633B1; DE19758242B4; KR19980058371A; DE19758242A1

Abstract

The pixels of a structure are arranged in rows in a first direction, each pixel being made up of three colour filter sub-pixels. The sub-pixels are arranged in a predetermined order RGB in the direction perpendicular to the length of the rows. The pixels in one row are offset by a predetermined distance from the pixels in an adjacent row. The arrangement improves the horizontal direction definition and allows the treatment of curve components. Also disclosed is a system for driving the LCD device whereby the driving frame is divided into first, second and third sub-frames with each sub-frame driving one of the sub-pixel colours.

Description

2320790 PIXEL ARRANGEMENT STRUCTURE, LIQUID CRYSTAL DISPLAY DEVICE USING

THE SAbE AND METHOD FOR DRIVING THE DEVICE

BACKGROUND OF THE INVENTION

FIELD OF THE PRESENT INVENTION

The present invention relates to technologies associated with liquid crystal display device, and particularly, to a lo pixel arrangement in a color filter, capable of enhancing the ability for treating the horizontal direction information and other information including the curve, and to a liquid crystal display device using the pixel arrangement, and to a method of driving the liquid crystal display device capable of reducing flicker therein.

RELATED PRIOR ART

A panel of liquid crystal display device includes a plurality of pixels, a color filter substrate which manifest the color of pixels by the subtracted mixing of complementary colors. These colors will hereinafter be referred to as P, G, and B in accordance with the common use of the colours Red, Green and Blue. Further, the panel includes a thin film transistor substrate for controlling each of the pixels, and a liquid crystal poured between the color filter substrate and the 1 thin film transistor substrate. Each of the pixels is comprised of sub- pixels each consisting of R, G and B. Generally, the pixels are arranged in the stripe, mosaic and delta manners as shown in Figs. 1A through 1C. In the stripe manner as shown in Fig. 1A, the pixels are arranged in order of R, G and B in each row. And, in the mosaic manner as shown in Fig. 1B, the pixels are repeatedly arranged in order of R, G and B in a first row, G, B and R in a second row, and B, R and G in a third row.

In the delta manner as shown in Fig. 1C, the pixels are repeatedly arranged such that the pixels arranged in even row in order of B, R and G are protruded by a given distance from the pixels arranged in odd row in order of R. G and B. In Figs. la vertical direction.

However, as most of the visual informations have more moving signals in their horizontal direction components than those in their vertical direction components, uses of the sub-pixel structures as shown in Figs. 1A through 1C do not provide effective treatment of the moving signals. For the effective treatment of the moving signals along the horizontal direction, increase in the resolution is needed.

In order to increase the resolution, reduction in the size accordance with the pixel arrangements as shown in through lc, the sub- pixel has a long length in its direction compared to that in its vertical 2 of sub-pixel is necessary. However, reducing the size of sub-pixel is difficult, although not impossible. This difficulty results in increase in the manufacturing cost thereof.

SUIVY OF THE INVENTION It is therefore an object of the present invention to provide a pixel arrangement and a crystal liquid display device using the same capable of treating horizontal direction signals in a smooth manner without increasing the resolution such that only the horizontal direction signals which needs high resolution, have an effect of increase in the resolution.

It is another object of the present invention to provide a pixel arrangement and a liquid crystal device using it capable of treating an image signal which requires the treatment of curve component.

It is still another object of the present invention to provide a liquid crystal display device and a method of driving it capable of reducing flicker in the picture.

To achieve the above objects and other objects of the present invention, the present invention in an aspect provides a pixel arrangement wherein a plurality of sub- pixels of a color filter, arranged in order of R, G and B in the direction substantially perpendicular to a scanning 3 progressive direction, are arranged in a matrix shape, and color filter pixels in even row in the scanning progressive direction are protruded by a predetermined distance from adjacent color filter pixels in odd row.

The present invention in another aspect provides a liquid crystal display device, comprising a plurality of gate lines disposed in a first direction on a first substrate; a plurality of data lines disposed in a second direction substantially perpendicular to the first direction and intersected with the gate lines; thin film transistors connected to the gate lines and the data lines respectively, at intersections of the gate lines and the data lines; color filter pixels disposed on a second substrate opposite the first substrate at portions opposite pixel electrodes which are driven by the thin film transistors, the pixels having sequentially arranged R, G and B in the second direction, and color filter pixels in even row in the first direction being protruded from adjacent color filter pixels in odd row by a selected distance.

Also, the present invention in still another aspect provides a liquid crystal display device, comprising a plurality of gate lines disposed in a first direction on a first substrate, a plurality of data lines disposed in a second direction substantially perpendicular to the first direction and intersected with the gate lines; thin film 4 transistors connected to the gate lines and the data lines respectively, at intersections of the gate lines and the data lines, the transistors disposed in even row in the first direction being consisted of a pair each connected to either sides of the data lines, the transistors disposed in odd row being one to one connected with one side of the data lines; color filter pixels disposed on a second substrate opposite the first substrate, at portions of the second substrate opposite pixel electrodes which are driven by the transistors, the pixels having sequentially arranged R, G and B in the second direction, and the color filter pixels in even row in the first direction being protruded from adjacent color filter pixels in odd row be a selected distance. Here, as the data lines passing the even row in the first direction have 180' to the data lines passing the odd row in the first direction in phase, the straight data lines can be embodied.

In still another aspect, the present invention provides a method of driving a liquid crystal display device with a plurality of sub-pixels of a color filter each consisting of R, G and B, comprising steps of: dividing a frame into a first sub- frame, a second sub-frame and a third sub-frame, and driving R signal in the first subframe, G signal in the second sub-frame, and B signal in the third sub-frame.

Meanwhile, an inversion of sub-frames is carried out such that the data lines which correspond to a given R signal of a first sub-frame in any frame have a phase difference of 180' from the data lines which correspond to a given G signal of the second sub-frame in the frame, with which the R signal forms a sub-pixel. And, the data lines corresponding to the G signal of the second sub-frame in the frame have a phase difference of 180' from the data lines which correspond to B signal of the third sub-frame in the frame, with which the R signal and the G signal form s sub-pixel.

Moreover, the inversion of frames is carried out such that the data lines corresponding to the respective R, G and B signals in each of the first through third subframes of any frame have 180' phase difference from data lines corresponding to the respective R, G and B signals in each of the first sub-frame, the second sub frame and the third frame of adjacent another frame.

R, G and B of the color filter are sequentially arranged in the direction perpendicular to the scanning progressive direction, the delta manner being used wherein the color filter pixels in even row in the scanning progressive direction are protruded from the adjacent color filter pixels in odd row by a given distance, such that an image signal in the horizontal direction and an image signal including curve component can be in a smooth manner treated.

6 A frame is divided into three sub-frames in the condition that of the constant frame time, and then R signal is driven in the first sub-frame, G signal the second sub-frame, and B signal the third sub-frame. Accordingly, the driving frequency in accordance with the present invention is higher than the prior art by three times, such that the flicker phenomenon can be reduced.

Additional objects, features and advantages of the various aspects of the present invention will become apparent from the following description which should be taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Figs. arrangements conventional Fig. pixels of embodiment Fig. driving a of a color Fig.

gate line the liquid 1A through 1C are drawings of sub-pixels of color filter liquid crystal display device.

2 is a drawing showing an arrangement of sub- a color filter in accordance with a first of the present invention.

3 is a drawing for explaining a method of liquid crystal display device having sub-pixels filter according to Fig. 2.

4A through 4G represent the pulse applied to the corresponding to R, G and B signals when driving crystal.

showing the in the 7 Figs. 4H and 41 represent the voltage pulse and phase of the data line as a function of the time.

Fig. 5 is a drawing showing an arrangement of subpixels of color filter in accordance with a second 5 embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

Referring to Fig. 2, R, G and B in a color filter are arranged in the perpendicular direction in the present invention whereas they are sequentially arranged in the horizontal direction in Figs 1A through 1C. Each of sub pixels of color filter is designated the sub-pixel (SP).

Moreover, the sub-pixels are arranged in the delta manner.

That is to say, the sub-pixels in even row are protruded from the subpixels in odd row by a selected distance.

Specifically referring to Fig. 2, gate lines G-Rl, GG1, G-Bl, G-R2, G-G2, G-B2, G-R3, G-G3, G-B3,..., G-Bn are disposed on a lower substrate (not shown) of panel of liquid crystal display device along with data lines D-1, D2, D-3,..., D-n to which the gate lines intersect.

The data lines were represented in dotted lines, G-Rl, G-R2, G-R3,-, G-Rn represent the gate lines corresponding to R signals of the color filter, G-Gl, G-G2, G-G3, G- G4,..., G-Gn represent the gate lines corresponding to G signal, and G-Bl, G-B2, G-B3,..., G-Bn represent the gate 8 lines corresponding to B signal. At intersections of the gate lines and the data lines, there are formed thin film transistors TFT11 as the switching devices for driving pixel electrodes (not shown).

Each of the thin film transistors TFT 11 is connected to the gate lines at its one end, are connected to the data lines at other end, and are connected to the pixel electrodes at another end. On an upper substrate (not shown) opposite the lower substrate at portions of opposite the pixel electrode, formed is the color filter. As described above, R, G and B constituting the sub-pixels of color filter are continuously disposed in the extension direction of the data lines. In this regard, as the sub pixels of color filter are arranged in the delta manner, the data lines are protruded along the protruded sub-pixels of color filter in even row.

Accordingly, it is possible to achieve the smooth treatment of the information which have more moving signal component in the horizontal direction, and the information including the curve component.

Hereinafter, a method of driving the liquid crystal display device will be described with reference to Fig. 3 and Figs. 4A through 41.

In an embodiment of the present invention, a frame driving manner is used wherein a frame is divided into three parts. Each of the divided parts is designated the 9 sub-frame. A frame driving time T=l/f, where f represents the frequency, is divided by 3, and the divided time is assigned to a first subframe, a second sub-frame and a third sub-frame, respectively. That is to say, R s- Lgnal during an initial one-third time T corresponding to a first sub-frame is scanned, G signal during a middle one-third time T corresponding to a second sub-frame is scanned, and B signal during a last onethird time T corresponding to a third sub-frame is scanned. For example, during the first sub-frame, the driving voltage is applied to R component of the color filter to generate R signal, if a panel of the liquid crystal display device wherein the number of data lines is m and the number of gate lines is n, is provided. At this time, as shown Figs. 4A through 4C, 4H and 41, the gate lines G-Rl, G-R2, G-R3,..., G-Rn corresponding to R signal also sequentially receive the logic "high" signal to allow the thin film transistors connected to thereto to turn on. And, the pulse with phase inversion is also applied to the data lines D1, D2, D3, Dm. That is to say, the thin film transistors are turned on by sequentially provided logic "high" signal, to drive the pixel electrodes, thereby to drive the liquid crystal between the data lines and the pixel electrodes. At this time, as R component of the color filter has a generated R signal, the light transmitted through liquid crystal exhibits red color by the R signal. In the same manner, the driving voltage during the second sub-frame is applied to G component of the color filter to generate G signal. In this regard, as shown in Figs. 4D, 4E, 4H and 41, the gate lines corresponding to G-Gl, G-G2, G-g3, ..., G-Gn also sequentially receive the logic "high" signal to allow the thin film transistors connected thereto to pass the electricity.

Also, the driving voltage during the second sub-frame is applied to G component of the color filter to generate G signal. In this regard, as shown in Figs. 4D, 4E, 4H and 41, the gate lines corresponding to G-Gl, GG2, G-g3, G-Gn also sequentially receive the logic "'high" signal to allow the thin film transistors connected thereto to pass the electricity. Also, in the third sub-frame, driving voltage is applied to the B component, generating the B signal. At this time, as shown in Figs. 4F through 41, the gate lines corresponding to GBl, G-B2, G-B3,..., G-Bn also sequentially receive the logic "high" signal to allow the thin film transistors connected thereto to turn on. Also, phase inversed signals are applied to the data lines. That is to say, the thin film transistors are turned on by sequentially provided logic "high" signal to drive the pixel electrodes, thereby driving the liquid crystal between the data line and the pixel electrode. At this time, B signal is generated in B component of the color filter, and the light transmitted through the liquid crystal 11 exhibits blue color.

As shown in Fig. 3, in each sub-frame of the same frame, the phase of the data line signals corresponding to R, G and B signals are inversed. That is to say, in the first sub-frame of N frame, the phases of data lines D1, D2,..., Dn corresponding to R1 signal is positive and the phase of data line corresponding to R2 signal is negative. In the second subframe of N frame, the phase of data lines D1, D2,..., Dn corresponding to G1 signal is negative and the phase of data lines corresponding to G2 signal is positive. Similarly, in the third sub-frame, the phase of data lines corresponding to B1 and B2 signals are also inversed.

Moreover, the phase of data lines corresponding to R1 signal applied to a first scanning line in a first subframe of a frame, has 180' to the phase of data lines corresponding to G1 signal applied to the first scanning line in a second sub-frame of the frame. The phase of data lines corresponding to B1 signal applied to the first scanning line in a third sub-frame of the frame is inversed against the data line corresponding to G1 signal in the second subframe of the frame. In the same sub-frame of each frame, the phases of data lines corresponding to the given R, G, and B signals are also inversed. That is to say, the phase of data lines D1, D2,..., Dn corresponding to R1 signal in a first sub-frame of N frame is inversed against 12 13 the phase of data lines D1, D2,..., Dn corresponding to RI signal in a first subfram of N+1 frame. The same descriptions as described above are given to G and B signals.

Consequently, the flicker phenomenon can be decreased, since the scanning process is progressed wherein a frame is divided into three sub-frames, the inversion of frame and the inversion of sub-frame are carried out and three times increased scanning frequently compared to the prior art is used.

FIG. 5 represents other embodiment of the present invention, which is a modification to FIG. 2. In FIG. 5, as a plurality of data lines and R, G, and B components are the same as those in FIG. 2, they have the same reference numerals as in the FIG. 2. And, the descriptions on the same elements as in FIG. 2 will be omitted.

In FIG. 2, the thin film transistors TFT 11 were one to one connected to each component of the sub-pixels. Referring to Fig.5 however, each of the sub-pixels in odd row is one to one connected with a thin film transistor 11 while each of the sub-pixels in even row is one to two with thin film transistors TFT 21 and TFT 22. That is, each of date lines is commonly to two transistors disposed in even row.

Accordingly, this embodiment provides a smooth treatment of the horizontal direction information and th curve-containing embodiment, although one occurred information. In addition, in this of two thin film transistors in even row has an defect, the liquid crystal device can be driven using another one of the thin film transistors. Therefore, this embodiment also provides the redundancy effect of thin film transistors.

Moreover, the data lines were designed in linearity across the sub-pixels in even row. Such linearity of the data lines results in reduction in the resistance of data lines. It is therefore possible to reduce the distortion of signal and obtain the exact image. Furthermore, an area comprising the data lines become smaller so as to increase the aperture ratio of liquid crystal display device.

The invention has been described in detail with particular thereof, but it modifications can of the invention reference to certain preferred ernbodiments will be understood that variations and be effected within the spirit and scope 14

Claims

WHAT IS CLAIMED IS:

1. A pixel arrangement structure comprising a plurality of rows of pixels, each pixel comprising a plurality of sub-pixels being color filters of complementary colors, said colors within each pixel being arranged in a predetermined order in a direction substantially perpendicular to the length of said rows, the sub-pixels being arranged in a matrix shape, and wherein the color filters of the pixels in each row are offset lo by a predetermined distance in the direction of the length of said rows from the color filters in adjacent rows.

2. A pixel arrangement structure according to claim 1 in which said complementary colors are red, green and blue.

3. A liquid crystal display device, comprising:

a plurality of gate lines disposed on a first substrate and extending in a first direction; a plurality of data lines extending in a second direction substantially perpendicular to' the fi rs t direction and intersected with the gate lines; thin film transistors connected to the gate lines and the data lines respectively, at intersections of the gate lines and the data lines; and color filter pixels having complementary colors sequentially arranged in the second direction and disposed on a second substrate opposite the first substrate at portions opposite pixel electrodes which are driven by the thin film transistors, the color filter pixels in each row in the first direction being offset from adjacent color filter pixels in 5 adjacent rows by a predetermined distance.

4. The liquid crystal display device as claimed in claim 3 whe rei n, the thin film transistors disposed in even numbered rows in the first direction consist of a pair each connected to either sides of the data lines, and the thin film transistors disposed in odd numbered rows are one to one connected with one side of the data lines.

1 C

5. The liquid crystal display device as claimed in the claim 4, wherein the phase of the data lines adjacent the even numbered rows in the first direction have a difference 180 to the phase of data lines adjacent the odd numbered rows in the first direction.

6. The liquid crystal display device as claimed in claim 3 wherein the thin film transistors disposed in even numbered rows and odd numbered rows are one to one connected to one side of the data lines.

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7. The liquid crystal display device as claimed in claim 3, 4, 5 or 6 in which said complementary colours are red, green and blue.

8. A method of driving a liquid crystal display device with a plurality of sub-pixels of color filters, each sub-pixel consisting one of three complementary colors, comprising the steps of:

dividing a frame into a first sub-frame, a second sub- frame and a third sub-frame; and driving a first signal for a first one of said colors in the first sub- frame, a second signal for a second one of said colors in the second sub- frame, and a third signal for a third one of said colors in the third sub- frame.

9. The method as claimed in the claim 8, wherein data lines corresponding to the first signal of the first sub-frame in the frame have 1800 phase difference from that of data lines corresponding to the second signal of the second subframe, the second signal forming a sub-pixel with the first signal, and data lines corresponding to the second signal of the second sub-frame in the frame have 180' phase difference from tha.t of data lines corresponding to the third signal of the third subframe, the third signal forming a sub-pixel with the second signal.

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10. The method as claimed in the claim 8, wherein data lines corresponding to each of the first, second and third signals in each of the first subframe, the second sub-frame and the third sub-frames of the frame have a phase difference of 1800, from data lines corresponding to each of the first, second and third signals in each of the first subframe, the second sub-frame and the third sub-frames of an adjacent frame.

11. The method as claimed in claim 8, 9, 10 or 11 in which 10 said complementary colors are red, green and blue.

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