KR20110066557A - Display device - Google Patents

Abstract

PURPOSE: A display device is provided to improve readability by placing R, G, and B pixels in horizontal direction and reduce production costs by reducing the number of data lines. CONSTITUTION: A display device comprises a first to a third pixels(R,G,B) which are placed in horizontal direction along the first gate line(GL1) and a second gate line(GL2), a first switching element(Tr1) which connects a data line(DL1) and the first pixel by being controlled by the first gate line, a second switching element(Tr2) which connects the data line and the second pixel by being controlled by the second gate line, a third switching element(Tr3) which connects the data line and a node by being controlled by a second scan signal, and a fourth switching element(Tr4) which connects the node and the third pixel by being controlled by a first scan signal.

Description

Display device {DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device capable of reducing manufacturing costs by reducing the number of data lines and increasing readability of characters displayed on a screen.

As competition among LCD panel industries has intensified, research on manufacturing cost reduction technologies has become more active, and as a part of these technologies, triple rate driving (TRD) technology for reducing the number of data lines is drawing attention.

This TRD technology arranges the red pixels, the green pixels, and the blue pixels that form one unit pixel in the vertical direction, connects the red pixels, the green pixels, and the blue pixels to one data line in common, and individually connects each pixel as described above. The present invention relates to a structure connected to a gate line. This technology reduces the number of data lines driven by relatively expensive data drivers, and the gate driver or gate integrated circuit, which is relatively inexpensive compared to this data driver, is embedded in the display panel. In Panel) By increasing the number of gate lines driven by the circuit there is an effect that can reduce the overall manufacturing cost. In other words, the data driver includes a plurality of data drive integrated circuits for driving data lines. Reducing the number of data lines can reduce the number of data drive integrated circuits used, resulting in a cost saving effect. do.

However, this TRD technique is excellent in the above-described cost reduction, but has a problem of poor readability of characters. In particular, new fonts, such as ClearType and CoolType, developed by Microsoft, are worse in readability due to worse fonts on display devices with TRD.

The present invention has been made to solve the above problems, by increasing the readability of the character by placing the red pixels, green pixels and blue pixels constituting the unit pixels in the horizontal direction, and the red pixels, green pixels and blue pixels It is an object of the present invention to provide a display device in which a manufacturing cost can be reduced by reducing the number of data lines by connecting each pixel to a gate line individually while connecting to one data line in common.

According to an aspect of the present invention, there is provided a display device including: first to third pixels displaying one unit image and disposed in a horizontal direction along a first gate line and a second gate line; A first switching element controlled by a first scan signal from the first gate line to connect a data line and the first pixel; A second switching element controlled by a second scan signal from the second gate line to connect the data line with a second pixel; A third switching element controlled by a second scan signal from the second gate line to connect the data line and a node; And a fourth switching element controlled by the first scan signal from the first gate line to connect the node and the third pixel.

The data line is supplied with image data in the order of the third pixel image data, the second pixel image data, and the first pixel image data every horizontal period.

The first and second scan signals each represent two active states per frame period; A first active state of the first scan signal is maintained for an nth horizontal period, and a second active state of the first scan signal is maintained for an n + 2th horizontal period; The first active state of the second scan signal is maintained for the nth horizontal period, and the second active state of the second scan signal is maintained for the n + 1th horizontal period.

The data line is supplied with image data in the order of the third pixel image data, the first pixel image data, and the second pixel image data every horizontal period.

The first and second scan signals each represent two active states per frame period; A first active state of the first scan signal is maintained for an nth horizontal period, and a second active state of the first scan signal is maintained for an n + 1th horizontal period; The first active state of the second scan signal is maintained for the nth horizontal period, and the second active state of the second scan signal is maintained for the n + 2th horizontal period.

In addition, the display device according to the present invention for achieving the above object is a display unit, the first to third pixels arranged in the horizontal direction along the first gate line and the second gate line; A first switching element controlled by a first scan signal from the first gate line to connect a first data line and the first pixel; A second switching element controlled by a second scan signal from the second gate line to connect between the first data line and a second pixel; A third switching element controlled by a first scan signal from the first gate line to connect the first data line and a node; And a fourth switching element controlled by a second scan signal from the second gate line to connect the node and the third pixel.

The display device according to the present invention has the following effects.

First, the readability of characters may be improved by placing the red pixels, the green pixels, and the blue pixels constituting the unit pixels in the horizontal direction.

Second, the red, green, and blue pixels are commonly connected to one data line, while each pixel is individually connected to the gate line, thereby reducing the number of data lines, thereby reducing manufacturing costs.

1 illustrates a display device according to an exemplary embodiment of the present invention.

As shown in FIG. 1, a liquid crystal display according to a first embodiment of the present invention includes a liquid crystal panel in which a plurality of pixels R, G, and B are formed for displaying an image, and a gate line of the liquid crystal panel. Gate driver for supplying scan signals to the fields GL1, GL2, ..., data driver for supplying image data to the data lines DL1, DL2, ... of the liquid crystal panel, and It includes a timing controller for controlling the driving of the gate driver and the data driver.

Red pixels, green pixels, and blue pixels located in one unit pixel are arranged in the horizontal direction along the gate line.

The timing controller generates a data control signal and a gate control signal using the horizontal synchronizing signal, the vertical synchronizing signal, and the clock signal supplied from the system, and supplies the data control signal and the gate control signal to the data driver and the gate driver. The data control signal includes a dot clock, a source shift clock, a source enable signal, a polarity inversion signal, and the like. The gate control signal is input to the gate driver including a gate start pulse, a gate shift clock, a gate output enable, and the like. In addition, the timing controller provides a data driver, various driving voltages necessary for the gate driver, and a gamma reference voltage required to generate the gamma voltage. In addition, the timing controller provides a gate high voltage corresponding to the high voltage of the scan pulse and a gate low voltage corresponding to the low voltage of the scan pulse.

After the data driver samples the image data according to the data control signal from the timing controller, the data driver latches the sampled image data in a line-wise manner every horizontal time (1H, 2H, ...) and stores the latched image data. To the lines. That is, the data driver converts the image data from the timing controller into an analog pixel signal using the gamma voltage input from the gamma voltage generation unit and supplies the converted data to the data lines. This data driver includes a plurality of data drive integrated circuits divided into data lines.

The gate driver includes a shift register that sequentially generates scan signals in response to a gate start pulse among the gate control signals from the timing controller, and a level shifter for shifting the voltage of the scan signal to a voltage level suitable for driving the liquid crystal cell. . The gate driver sequentially supplies scan signals to the gate lines in response to the gate control signal. The gate driver includes a plurality of gate drive integrated circuits divided into gate lines and connected.

As shown in FIG. 1, a pixel row is formed between a 2k-1th (k is a natural number) gate line and a 2kth gate line of the liquid crystal panel, and a plurality of pixels R, G, and B are formed in the pixel row. ) Is formed. These pixels R, G, and B include a red pixel R for displaying a red image, a green pixel G for displaying a green image, and a blue pixel B for displaying a blue image. The red pixel R, the green pixel G, and the blue pixel B arranged adjacent to each other in one pixel row form a unit pixel UPXL for displaying one unit image. These unit pixels UPXL are commonly connected to one data line through the switching elements Tr1 to Tr4.

A configuration of one unit pixel UPXL positioned in the first pixel row and connected to the first data line DL1 will be described below.

One unit pixel UPXL includes a red pixel R, a green pixel G, and a blue pixel B, and a plurality of switching devices connecting the first pixel line GL1 and the first data line DL1 to each other. (Tr1 to Tr4).

The first switching element Tr1 is controlled by the first scan signal SS1 from the first gate line GL1 to connect the first data line DL1 to the red pixel R.

The second switching element Tr2 is controlled by the second scan signal SS2 from the second gate line GL2 to connect the first data line DL1 and the green pixel G.

The third switching element Tr3 is controlled by the second scan signal SS2 from the second gate line GL2 to connect the first data line DL1 to the node N.

The fourth switching device Tr4 is controlled by the first scan signal SS1 from the first gate line GL1 to connect the node N and the blue pixel B.

2A and 2B are timing diagrams of signals supplied to the data line and the gate line of FIG. 1.

Signals as shown in FIG. 2A are supplied to the data line and gate line of FIG. 1, or signals as shown in FIG. 2B.

First, as shown in FIG. 2A, the first and second scan signals SS1 and SS2 each represent two active states per frame period. That is, the first active state of the first scan signal SS1 is maintained for the nth 1/3 horizontal period, and the second active state of the first scan signal SS1 is for the n + 2nd 1/3 horizontal period. maintain. The first active state of the second scan signal SS2 is maintained for the nth 1/3 horizontal period, and the second active state of the second scan signal SS2 is maintained for the n + 1th 1/3 horizontal period. maintain. At this time, image data is supplied to the first data line DL1 in the order of blue image data Bd, green image data Gd, and red image data Rd every 1/3 horizontal period.

One unit pixel UPXL positioned in the first pixel row in FIG. 1 and connected to the first data line DL1 and one signal in the present invention with reference to the signal shown in FIG. 2A. The operation is described in detail as follows.

Both the first and second scan signals SS1 and SS2 remain in an active state, that is, a high state, during the first period T1, and blue image data Bd is supplied to the first data line DL1. The first scan signal SS1 having the high state is supplied to the first gate line GL1 and is connected to the first gate line GL1 through the gate electrode, respectively, and the first and fourth switching devices Tr1 and Tr4 are connected to the first gate line GL1. Turn on. In addition, the second scan signal SS2 in the high state is supplied to the second gate line GL2 and is connected to the second gate line GL2 through the gate electrode, respectively. Turn on Tr3).

Accordingly, the blue image data Bd from the first data line DL1 is supplied to the red pixel R through the turned-on first switching device Tr1. In addition, the blue image data Bd from the first data line DL1 is supplied to the green pixel G through the turned-on second switching element Tr2. In addition, the blue image data Bd from the first data line DL1 is supplied to the blue pixel B through the turned-on third and fourth switching elements Tr4.

As described above, the red pixel R, the green pixel G, and the blue pixel B all receive the blue image data Bd during the first period T1.

Next, the operation of the second period T2 will be described.

During the second period T2, the first scan signal SS1 remains in an inactive state, that is, a low state, and the second scan signal SS2 maintains a previous active state, that is, a high state. In addition, green image data Gd is supplied to the first data line DL1 in the second period T2. The first scan signal SS1 in this low state is supplied to the first gate line GL1 and connected to the first gate line GL1 through a gate electrode, respectively, and the first and fourth switching devices Tr1 and Tr4. Turn off. In addition, the second scan signal SS2 in the high state is supplied to the second gate line GL2 and is connected to the second gate line GL2 through the gate electrode, respectively. Keep Tr3) on.

Accordingly, the green image data Gd from the first data line DL1 is supplied to the green pixel G through the turned-on second switching element Tr2. Therefore, the previous blue image data Bd stored in this green pixel G is updated with the green image data Gd supplied to this second period T2.

In this manner, during the second period T2, the green pixel G receives the green image data Gd.

Next, the operation of the third period T3 will be described.

During the third period T3, the first scan signal SS1 is changed back to an active state, that is, a high state, and the second scan signal SS2 is changed to an inactive state, that is, a low state. In addition, red image data Rd is supplied to the first data line DL1 in the third period T3. The first scan signal SS1 having the high state is supplied to the first gate line GL1 and is connected to the first gate line GL1 through the gate electrode, respectively, and the first and fourth switching devices Tr1 and Tr4 are connected to the first gate line GL1. Turn on. In addition, the second scan signal SS2 in the low state is supplied to the second gate line GL2 and is connected to the second gate line GL2 through the gate electrode, respectively. Turn off Tr3).

Accordingly, the red image data Rd from the first data line DL1 is supplied to the red pixel R through the turned-on first switching device Tr1. Therefore, the previous blue image data Bd stored in this red pixel R is updated with the red image data Rd supplied to this second period T2.

In this manner, the red pixel R is supplied with the red image data Rd during the third period T3.

As a result, when the time corresponds to one horizontal period, the red pixel R, the green pixel G, and the blue pixel B all receive image data corresponding to their own data to display an image.

Meanwhile, the display device of FIG. 1 may receive a signal as shown in FIG. 2B.

According to FIG. 2B, the first and second scan signals SS2 each represent two active states per frame period. That is, the first active state of the first scan signal SS1 is maintained for the nth 1/3 horizontal period, and the second active state of the first scan signal SS1 is for the n + 1th 1/3 horizontal period. maintain. Further, the first active state of the second scan signal SS2 is maintained for the nth 1/3 horizontal period, and the second active state of the second scan signal SS2 is for the n + 2nd 1/3 horizontal period. maintain. At this time, image data is supplied to the first data line DL1 in the order of blue image data Bd, red image data Rd, and green image data Gd every 1/3 horizontal period.

One unit pixel UPXL positioned in the first pixel row of FIG. 1 and connected to the first data line DL1 and one signal of the unit pixel UPXL of the present invention will be described with reference to the signal shown in FIG. 2B. The operation is described in detail as follows.

Both the first and second scan signals SS2 remain in an active state, that is, a high state, during the first period T1, and the blue image data Bd is supplied to the first data line DL1. The first scan signal SS1 having the high state is supplied to the first gate line GL1 and is connected to the first gate line GL1 through the gate electrode, respectively, and the first and fourth switching devices Tr1 and Tr4 are connected to the first gate line GL1. Turn on. In addition, the second scan signal SS2 in the high state is supplied to the second gate line GL2 and is connected to the second gate line GL2 through the gate electrode, respectively. Turn on Tr3).

Accordingly, the blue image data Bd from the first data line DL1 is supplied to the red pixel R through the turned-on first switching device Tr1. In addition, the blue image data Bd from the first data line DL1 is supplied to the green pixel G through the turned-on second switching element Tr2. In addition, the blue image data Bd from the first data line DL1 is supplied to the blue pixel B through the turned-on third and fourth switching elements Tr4.

As described above, the red pixel R, the green pixel G, and the blue pixel B all receive the blue image data Bd during the first period T1.

Next, the operation of the second period T2 will be described.

The second scan signal SS2 remains in an inactive state, that is, a low state, during the second period T2, and the first scan signal SS1 maintains a previous active state, that is, a high state. In addition, red image data Rd is supplied to the first data line DL1 in the second period T2. The first scan signal SS1 having the high state is supplied to the first gate line GL1 and is connected to the first gate line GL1 through the gate electrode, respectively, and the first and fourth switching devices Tr1 and Tr4 are connected to the first gate line GL1. Turn on. In addition, the second scan signal SS2 in the low state is supplied to the second gate line GL2 and is connected to the second gate line GL2 through the gate electrode, respectively. Turn off Tr3).

Accordingly, the red image data Rd from the first data line DL1 is supplied to the red pixel R through the turned-on first switching device Tr1. Therefore, the previous blue image data Bd stored in this red pixel R is updated with the red image data Rd supplied to this second period T2.

In this way, the red pixel R is supplied with the red image data Rd during the second period T2.

Next, the operation of the third period T3 will be described.

During the third period T3, the second scan signal SS2 is changed back to an active state, that is, a high state, and the first scan signal SS1 is changed to an inactive state, that is, a low state. In addition, green image data Gd is supplied to the first data line DL1 in the third period T3. The second scan signal SS2 in this high state is supplied to the second gate line GL2 and is connected to the second gate line GL2 through the gate electrode, respectively, and the second and third switching elements Tr2 and Tr3 are connected to each other. Turn on. In addition, the first scan signal SS1 in the low state is supplied to the first gate line GL1 and connected to the first gate line GL1 through the gate electrode, respectively. Turn off Tr4).

Accordingly, the green image data Gd from the first data line DL1 is supplied to the green pixel G through the turned-on second switching element Tr2. Therefore, the previous blue image data Bd stored in this green pixel G is updated with the green image data Gd supplied to this third period T3.

In this manner, during the third period T3, the green pixel G receives the green image data Gd.

As a result, when the time corresponds to one horizontal period, the red pixel R, the green pixel G, and the blue pixel B all receive image data corresponding to their own data to display an image.

3 is a diagram illustrating a display device according to a second exemplary embodiment of the present invention.

The display device according to the second embodiment of the present invention has a structure substantially similar to that of the first embodiment of FIG. 1, and includes only one unit pixel UPXL as shown in FIG. 3. The connection structures of the third and fourth switching elements Tr3 and Tr4 are different.

A configuration of one unit pixel UPXL positioned in the first pixel row and connected to the first data line DL1 will be described below.

One unit pixel UPXL includes a red pixel R, a green pixel G, and a blue pixel B, and a plurality of switching devices connecting the first pixel line GL1 and the first data line DL1 to each other. (Tr1 to Tr4).

The first switching element Tr1 is controlled by the first scan signal SS1 from the first gate line GL1 to connect the first data line DL1 to the red pixel R.

The second switching element Tr2 is controlled by the second scan signal SS2 from the second gate line GL2 to connect the first data line DL1 and the green pixel G.

The third switching device Tr3 is controlled by the first scan signal SS1 from the first gate line GL1 to connect the first data line DL1 and the node N.

The fourth switching device Tr4 is controlled by the second scan signal SS2 from the second gate line GL2 to connect the node N and the blue pixel B.

The signals illustrated in FIG. 2A or 2B described above may be supplied to the display device according to an exemplary embodiment of the present invention. Since the operation of one unit pixel UPXL in the display device according to the second embodiment is the same as the operation of one unit pixel UPXL in the first embodiment, description thereof will be omitted.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

1 illustrates a display device according to an exemplary embodiment of the present invention.

2A and 2B are timing diagrams of signals supplied to the data line and the gate line of FIG.

3 illustrates a display device according to a second exemplary embodiment of the present invention.

Claims (6)

First to third pixels that display one unit image and are disposed in a horizontal direction along the first gate line and the second gate line; A first switching element controlled by a first scan signal from the first gate line to connect a data line and the first pixel; A second switching element controlled by a second scan signal from the second gate line to connect the data line with a second pixel; A third switching element controlled by a second scan signal from the second gate line to connect the data line and a node; And, And a fourth switching element controlled by the first scan signal from the first gate line to connect the node and the third pixel. The method of claim 1, And the image data is supplied to the data line in the order of the third pixel image data, the second pixel image data, and the first pixel image data every horizontal period. The method of claim 2, The first and second scan signals each represent two active states per frame period; A first active state of the first scan signal is maintained for an nth horizontal period, and a second active state of the first scan signal is maintained for an n + 2th horizontal period; And the first active state of the second scan signal is maintained for an nth horizontal period, and the second active state of the second scan signal is maintained for an n + 1th horizontal period. The method of claim 1, And the image data is supplied to the data line in the order of the third pixel image data, the first pixel image data, and the second pixel image data every horizontal period. The method of claim 4, wherein The first and second scan signals each represent two active states per frame period; A first active state of the first scan signal is maintained for an nth horizontal period, and a second active state of the first scan signal is maintained for an n + 1th horizontal period; And the first active state of the second scan signal is maintained for the nth horizontal period, and the second active state of the second scan signal is maintained for the n + 2th horizontal period. First to third pixels that display one unit image and are disposed in a horizontal direction along the first gate line and the second gate line; A first switching element controlled by a first scan signal from the first gate line to connect a first data line and the first pixel; A second switching element controlled by a second scan signal from the second gate line to connect between the first data line and a second pixel; A third switching element controlled by a first scan signal from the first gate line to connect the first data line and a node; And, And a fourth switching element controlled by a second scan signal from the second gate line to connect the node and the third pixel.

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