JPH10293285A - Pixel arrangement structure, liquid crystal display element using it and its drive method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make pixel arrangement capable of naturally processing a signal in the horizontal direction by allowing a color filter pixel of an even column to project from an adjacent color filter pixel of an odd column by a fixed distance in the scanning direction. SOLUTION: A thin film transistor TFT 11 being a switching element for driving a pixel electrode is formed at an intersection between a gate line and a data line. One end of this TFT 11 is connected to the gate line, and another end is connected to the data line, and a remaining end is connected to the pixel electrode. A color filter is formed on a part opposite to the pixel electrode on an upper substrate. In this color filter unit pixel constituted of R, G and B, and R, G and B are arranged continuously in the prolonging direction of the data line. However, since the color filter unit pixel is arranged by a delta formation, the data line is bent/projected along the color filter unit pixel of the even column. Thus, the information containing the information and a curve with more movement in the horizontal direction is processed naturally.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a color filter pixel array capable of improving the processing capability of information including horizontal information and curves, a liquid crystal display device using the same, and a liquid crystal display device using the same. The present invention relates to a technique of a driving method of a liquid crystal display element which can reduce image flicker.

[0002]

2. Description of the Related Art A panel of a liquid crystal display device has a large number of pixels and subtracts and mixes the hues of the plurality of pixels by subtraction of R, G, and B.
It comprises a color filter substrate developed by btracted mixing, a thin film transistor substrate for controlling each pixel, and a liquid crystal injected between the color filter substrate and the thin film transistor substrate. The plurality of pixels are composed of unit pixels (sub-pixels) composed of red, green, and blue.

Generally, such pixels are arranged in stripe, mosaic, and delta systems as shown in FIGS. The RGB stripe method shown in FIG. 5 is arranged in R, G, B order in each column, and the RGB mosaic method shown in FIG. 6 is in R, G, B order in the first column, and G, B, B in the second column.
In the order of R, the third column is repeatedly arranged in the order of B, R, and G. FIG.
In the delta method shown in (1), pixels arranged in the order of R, G, and B in an even-numbered column are repeatedly arranged in such a structure that they protrude at predetermined intervals from pixels arranged in the order of R, G, and B in an odd-numbered column. According to the pixel arrangements of FIGS. 5 to 7, the size of each unit pixel is longer in the column direction (horizontal direction) than in the row direction (vertical direction).

However, most of the visual information has more motion signals in the horizontal component than in the vertical component. Therefore, in the unit pixel structure as shown in FIGS. 5 to 7, the data display in the horizontal direction lacks precision, and natural motion signal processing cannot be performed. In order to process this horizontal motion signal naturally, the resolution may be increased, but in order to increase the resolution, it is necessary to minimize the unit pixel, and it is not technically possible to minimize the unit pixel. Even so, there is a problem that difficulty is involved in the manufacturing process and the manufacturing cost of the product increases.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the same effect as increasing the resolution only in the horizontal direction without increasing the resolution. It is an object of the present invention to provide a pixel array capable of naturally processing a horizontal signal and a liquid crystal display device using the same. It is another object of the present invention to provide a pixel array capable of processing a video signal requiring curve processing and a liquid crystal display device using the same. Still another object is to provide a driving method of a liquid crystal display device which can reduce image flicker.

[0006]

In order to achieve the object of the present invention, a plurality of unit color filter pixels in which R, G, and B are sequentially arranged in a direction substantially perpendicular to the scanning direction (lateral direction). Are arranged in the form of a matrix, and the even-numbered color filter pixels in the scanning progress direction are arranged in a delta-type pixel array structure protruding a certain distance in the scanning direction from odd-numbered color filter pixels adjacent to the even-numbered color filter pixels. And

According to another aspect of the present invention, there is provided a liquid crystal display device comprising a plurality of gate lines arranged on a first substrate in a first direction, and a plurality of gate lines arranged in a second direction substantially perpendicular to the first direction. A plurality of data lines intersecting the gate line, thin film transistors respectively connected to the data line and the gate line at intersections of the data line and the gate line, and a second substrate facing the first electrode. A color filter pixel in which R, G, and B are sequentially arranged in the second direction at a portion facing a pixel electrode driven by the thin film transistor; Is configured to protrude from the odd-numbered color filter pixels adjacent to the even-numbered color filter pixels by a certain distance in the scanning direction.

According to another aspect of the present invention, there is provided a liquid crystal display device including a plurality of gate lines arranged on a first substrate in a first direction, and a plurality of gate lines arranged in a second direction substantially perpendicular to the first direction. A plurality of data lines intersecting the gate lines, thin film transistors respectively connected to the data lines and the gate lines at intersections of the data lines and the gate lines, and thin film transistors arranged in even columns in the first direction. Are configured as one pair and connected one by one to both sides of the data line, and the thin film transistors arranged in odd columns in the first direction are connected to the one side of the data line 1: 1 with the data line. In a portion of the second substrate facing the one electrode facing the pixel electrode driven by the thin film transistor element, R, G,
B are sequentially arranged, and the even-numbered color filter pixels in the first direction are arranged in the scanning direction from odd-numbered color filter pixels adjacent to the even-numbered color filter pixels. It is configured to project a fixed distance. Here, the data line passing through the even-numbered column in the first direction and the data line passing through the odd-numbered column in the first direction substantially form 180 ° to form a straight line of the data line. it can.

Further, R for achieving the object of the present invention,
A method of driving a liquid crystal display element having a large number of unit color filter pixels composed of G and B is such that one frame is divided into first to third sub-frames, and the large number of R signals are divided in the first sub-frame. And driving the plurality of G signals in the second sub-frame and driving the plurality of B signals in the third sub-frame.

On the other hand, the phase of the data line corresponding to the predetermined R signal of the first sub-frame of any one frame is the same as the phase of the data line constituting the unit pixel together with the predetermined R signal. It has a phase difference of approximately 180 ° with the data line corresponding to the G signal of two subframes,
The phase of the data line corresponding to the G signal of the second sub-frame of the one frame is the one of the one of the predetermined R signals and the predetermined G signal, which together form a unit pixel. The inversion of the sub-frame is performed so as to have a phase difference of about 180 ° with the data line corresponding to the B signal of the third sub-frame of the frame. Further, the phase of the data line corresponding to each of the R, G, and B signals in each of the first to third sub-frames of any one frame may be the first phase of another frame adjacent to the any one frame. To the data lines corresponding to the R, G, and B signals in each of the third to third subframes.
The frame is inverted so as to have a phase difference of 0 °.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Referring to FIG. 1, a color filter composed of R, G, and B is different from the conventional technology shown in FIGS. 5 to 7 in that R, G, and B are sequentially arranged in a horizontal direction. In the present invention, they are arranged vertically. The unit pixel of each color filter is indicated by a sub-pixel SP.
Further, the unit pixels SP are arranged in a delta system, that is, a structure (see FIG. 7) in which unit pixels in even-numbered columns protrude a predetermined distance from unit pixels in odd-numbered columns in the scanning direction.

More specifically, the gate line GR
1, GG1, GB1, GR2, GG2, GB
2, G-R3, G-G3, G-B3 ... G-Bn;
Data lines D-1, D intersecting with each of these gate lines
.., Dm are arranged on a lower substrate (not shown) of the panel of the liquid crystal display device. Each of the data lines is indicated by a dotted line. G-R1, G-R2, G
-R3... G-Rn indicate gate lines corresponding to the color filter R signal, and G-G1, G-G2, G-
G3, G-G4,... G-Gn indicate gate lines corresponding to the G signal, G-B1, G-B2, G-B3.
G-Bn indicates a gate line corresponding to the B signal. At the intersection of the gate line and the data line, a thin film transistor TFT11 which is a switching element for driving a pixel electrode (not shown) is formed. One end of the thin film transistor TFT11 is connected to a gate line, the other end is connected to a data line, and the other end is connected to a pixel electrode.

A color filter is formed on a portion of the upper substrate (not shown) facing the lower substrate (not shown) facing the pixel electrode. In this color filter unit pixel composed of R, G, and B, R, G, and B are continuously arranged in the data line extending direction as described above. However, since the color filter unit pixels are arranged in the delta method, the data lines are bent and projected along the even-numbered columns of the color filter unit pixels. Therefore, information that includes a large amount of movement in the horizontal direction, that is, the direction in which scanning proceeds, and information that includes a curve can be naturally processed.

Next, FIGS. 2 and 3 (a) to 3 (i)
A driving method of the liquid crystal display device of FIG. 1 will be described with reference to FIG.
In this embodiment, a frame driving method in which one frame is divided into three parts is used. Each of the divided parts is called a sub-frame. The frame driving time (T = 1 / f; f is frequency) is divided into three and each is allocated to the first to third subframes. That is, the R signal is scanned during the first (1/3) T (first sub-frame), and the G signal is continuously scanned during the second (1/3) T (second sub-frame). , And the B signal is scanned during the last (（) T (third subframe).

For example, when a liquid crystal display panel has m data lines and n gate lines, a driving voltage is applied to the R component of the color filter in the first sub-frame to generate an R signal. At this time, as shown in FIGS. 3 (a) to 3 (c), 3 (h) and 3 (i),
Gate lines G-R1, G-R2, G corresponding to the R signal
-R3... G-Rn also sequentially receive the logic "high" signal, and the gate lines G-R1, GR-R2, GR-R3.
A thin film transistor connected to G-Rn is turned on, and a pulse having a phase inversion is applied to data lines D1, D2, and D3.
D3... Dm. That is, the thin film transistor is turned on by the sequentially applied logic "high" signal, thereby driving the pixel electrode and driving the liquid crystal between the data line and the pixel electrode. As a result, an R signal is generated in the R component of the color filter, so that the light transmitted through the liquid crystal layer becomes reddish by the R signal.

Similarly, in the second sub-frame, a driving signal is applied to the G component of the color filter to generate a G signal. 3 (d), 3 (e) and 3
(H) and the gate lines G-G1, G-G2, G-G3,.
Gn also sequentially receives a logic "high" signal, and the thin film transistors connected to the gate lines GG1, GG2, GG3,. Also data lines D1, D2, D3 ... D
m. That is, the thin film transistor is turned on by the sequentially provided logic "high" signal, thereby driving the pixel electrode and driving the liquid crystal between the data line and the pixel electrode. As a result, a G signal is generated in the G component of the color filter, and light transmitted through the liquid crystal layer becomes green due to the G signal.

On the other hand, in the third sub-frame, a driving signal is applied to the B component of the color filter to generate a B signal. As a result, as shown in FIGS. 3F to 3I, the gate lines G-B1 and G-B corresponding to the B signal are output.
, G-B3... G-Bn also sequentially receive a logic "high" signal, and receive the gate lines G-B1, G-B2, G-Bn.
B3... The thin film transistor connected to G-Bn is turned on, and a signal having a phase inversion is also applied to the data line D.
1, D2, D3,..., Dm. That is, the thin film transistor is turned on by the sequentially provided logic "high" signal, thereby driving the pixel electrode and driving the liquid crystal between the data line and the pixel electrode. As a result, a B signal is generated in the B component of the color filter, and the light transmitted through the liquid crystal layer becomes blue due to the B signal.

As shown in FIG. 2, the phases of the data line signals corresponding to the R, G, and B signals in each subframe of the same frame are inverted (subframe inversion). That is, in the first sub-frame of the N frame, the phases of the data lines D1, D2... Dm corresponding to the R1 signal are +, the phases of the data lines corresponding to the R2 signal are-, and the second In the sub-frame, the phases of the data lines D1, D2... Dm corresponding to the G1 signal are-, and the phases of the data lines corresponding to the G2 signal are +. Also in the third sub-frame, the phases of the data lines corresponding to the B1 and B2 signals are inverted.

Also, in the first sub-frame of one frame, the phase of the data line corresponding to the R1 signal applied to the first scanning line and the phase of the data line applied to the same first scanning line in the second sub-frame of the same frame. G1
The phase of the data line corresponding to the signal is 180 °, and the phase of the data line corresponding to the B1 signal applied to the same first scan line in the third sub-frame of the same frame is also the second sub-frame of the same frame. Invert the data lines corresponding to the same G1 signal in the frame.

In addition, the phase of the data line signal corresponding to the predetermined R, G, B signals in the same subframe of each frame is also inverted (frame inversion). That is, the data line D corresponding to the R1 signal of the first subframe of the N frame
The phases of D1,... Dm are data lines D1, D2 corresponding to the R1 signal of the first subframe of the (N + 1) th frame.
... Invert with the phase of Dm. The same description can be applied to the G signal and the B signal. As a result, one frame is divided into three sub-frames, and the scanning process is performed using the scanning frequency three times as large as the conventional one while performing the frame inversion and the sub-frame inversion, thereby reducing the flicker phenomenon. it can.

FIG. 4 shows another embodiment of the present invention as a modification of FIG. The multiple gate lines, the multiple data lines, and the R, G, B components are the same as those in FIG. 1 and use the same reference numbers as in FIG. Description is omitted. However, in the embodiment shown in FIG. 1, the thin film transistor TFT11 is connected 1: 1 with each component of the unit pixel. However, in the embodiment shown in FIG.
11 and each component of the unit pixel are connected in a 1: 1 ratio, but the unit pixels in the even-numbered columns are thin film transistors TFT21 and TFT22.
And each component of the unit pixel are connected at 2: 1. That is, the data lines D1, D2, D3,..., Dm are commonly connected to two transistors arranged in even columns. Therefore, not only can horizontal information and information including a curve be processed smoothly, but even if one of the two thin film transistors has a defect in an even-numbered column, the liquid crystal display element can be driven by using the other thin film transistor. Therefore, a redundant effect of the thin film transistor can be obtained.

Further, the data lines are provided in a straight line across the unit pixels in the even columns, and the resistance of the data lines is reduced by the linearization of the data lines. Therefore, an accurate image can be obtained with less signal distortion.
As a result, the area occupied by the data lines is reduced, and the aperture ratio of the liquid crystal display element is also increased.

[0023]

As described above, according to the present invention, since the same effect as when the resolution is increased in the horizontal direction without increasing the resolution is produced, the video signal and the curve in the horizontal direction are included. A pixel array structure capable of processing a video signal more smoothly and reducing a flicker phenomenon, a liquid crystal display element using the same, and a method of driving the liquid crystal display element can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing an arrangement of color filter unit pixels according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a method of driving a liquid crystal display device having the color filter unit pixel shown in FIG.

FIGS. 3A to 3G are diagrams showing voltage pulses applied to gate lines corresponding to R, G, and B signals at the time of driving the liquid crystal, and FIGS. FIG. 3 is a diagram illustrating voltage pulses and their phases according to time.

FIG. 4 is a diagram showing an arrangement of color filter unit pixels according to another embodiment of the present invention.

FIG. 5 is a diagram showing an arrangement of unit color filter pixels of a general liquid crystal display element.

FIG. 6 is a diagram showing an arrangement of unit color filter pixels of a general liquid crystal display element.

FIG. 7 is a diagram showing an arrangement of unit color filter pixels of a general liquid crystal display element.

[Explanation of symbols]

G-B1, G-B2 to G-Bn, G-G1, G-G2
G-Gn, G-R1, G-R2 to G-Rn Gate line D1, D2, D3 to Dm Data line TFT11, TFT21, TFT22 Transistor SP Subpixel

Claims (7)

[Claims] An R, G, B direction substantially orthogonal to a scanning direction.
Are arranged in a matrix form, and the even-numbered color filter pixels are arranged so as to protrude from the adjacent odd-numbered color filter pixels by a predetermined distance in the scanning direction. Color filter pixel array structure. 2. A plurality of gate lines arranged in a first direction on a first substrate; a plurality of data lines arranged in a second direction substantially orthogonal to the first direction and intersecting the gate lines; A thin film transistor disposed at an intersection of a line and the gate line and connected to the data line and the gate line, respectively; and a portion of a second substrate facing the first substrate facing a pixel electrode driven by the thin film transistor A color filter pixel in which R, G, and B are sequentially arranged in the second direction, and the color filter pixels in an even-numbered column in the first direction are:
A liquid crystal display element, wherein the liquid crystal display element is arranged so as to protrude from the adjacent odd-numbered color filter pixels by a predetermined distance in the scanning direction. A plurality of gate lines arranged in a first direction of the first substrate; a plurality of data lines arranged in a second direction substantially orthogonal to the first direction and intersecting with the gate lines; A thin film transistor disposed at an intersection of a line and the gate line and connected to the data line and the gate line, respectively; Connected to both sides, the first
The thin film transistors arranged in odd columns in the direction are connected to the data line on one side with the data line at a ratio of 1: 1, and face the pixel electrode driven by the thin film transistor element of the second electrode facing the first electrode. A color filter pixel in which R, G, and B are sequentially arranged in the second direction, and the color filter pixels in the even rows in the first direction are adjacent to the color filter pixels in the odd rows. A liquid crystal display element, wherein the liquid crystal display element is arranged so as to protrude a predetermined distance in a scanning direction. 4. The data line passing through the even columns in the first direction and the data lines passing through the odd columns in the first direction are substantially at 180 °. The liquid crystal display element as described in the above. 5. A method for driving a liquid crystal display device having a large number of unit color filter pixels composed of R, G, and B, wherein one frame is divided into first to third sub-frames, Driving the multiple R signals, driving the multiple G signals in the second sub-frame, and driving the multiple B signals in the third sub-frame. . 6. The phase of a data line corresponding to a predetermined R signal of a first sub-frame of any one frame is:
The data line corresponding to the G signal of the second sub-frame of any one of the frames constituting a unit pixel together with the predetermined R signal has a phase difference of approximately 180 °, and The G of the second subframe
The phase of the data line corresponding to the signal is substantially 180 ° out of phase with the data line corresponding to the B signal of the third sub-frame that constitutes a unit pixel together with the predetermined R signal and the predetermined G signal. 6. The method for driving a liquid crystal display element according to claim 5, comprising: 7. The first to third frames of any one frame
The phase of the data line corresponding to each of the R, G, and B signals in each subframe is the same as the R, G, and B in each of the first to third subframes of another frame adjacent to the one frame. 6. The method according to claim 5, wherein the liquid crystal display element has a phase difference of about 180 degrees from a data line corresponding to each signal.