KR101585007B1 - Display device - Google Patents

Abstract

The present invention relates to a display device capable of reducing the number of data lines to reduce the manufacturing cost and improving the readability of characters displayed on a screen. The display device displays one unit image and has a first gate line and a second gate line First through third pixels arranged in a horizontal direction; A first switching element controlled by a first scan signal from the first gate line to connect the 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 to the second pixel; A third switching device controlled by a second scan signal from the second gate line to connect the data line and the node; And a fourth switching element controlled by a first scan signal from the first gate line to connect the node to the third pixel.

Display device, TRD, scan signal, readability

Description

Display device {DISPLAY DEVICE}

The present invention relates to a display device, and more particularly, to a display device capable of reducing the number of data lines to reduce manufacturing costs and improving the readability of characters displayed on a screen.

As competition among the LCD panel industry has intensified and research into manufacturing cost reduction technologies has become more active, triple rate driving (TRD) technology has been attracting interest as a means of reducing the number of data lines.

This TRD technique arranges red pixels, green pixels and blue pixels constituting one unit pixel in the longitudinal direction, connects these red pixels, green pixels and blue pixels to one data line in common, To the gate line. According to this technique, the number of data lines driven by a relatively high-priced data driver is reduced, and a relatively low-priced gate driver or gate integrated circuit is mounted on the display panel in a GIP (Gate The number of gate lines driven by the In panel circuit is increased, thereby reducing the overall manufacturing cost. That is, since the data driver includes a plurality of data drive ICs for driving data lines, if the number of data lines is reduced, the number of data drive ICs used can be reduced, resulting in cost reduction. do.

However, such a TRD technique is excellent in terms of cost reduction described above, but has a problem that the readability of characters is poor. In particular, new fonts such as ClearType developed by Microsoft Corporation and CoolType developed by Adobe Corporation become less readable due to poorer character formatting on a display device to which TRD is applied.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to improve the readability of characters by locating red pixels, green pixels and blue pixels constituting unit pixels in the horizontal direction, The present invention aims to provide a display device capable of reducing the manufacturing cost by connecting each pixel to the gate line separately while reducing the number of data lines.

According to an aspect of the present invention, there is provided a display device including first to third pixels arranged 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 the 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 to the second pixel; A third switching device controlled by a second scan signal from the second gate line to connect the data line and the node; And a fourth switching element controlled by a first scan signal from the first gate line to connect the node to the third pixel.

The image data for the third pixel, the image data for the second pixel, and the image data for the first pixel are supplied to the data line in every horizontal period.

Wherein the first and second scan signals each represent two active states per frame period; Wherein the first active state of the first scan signal is maintained during the nth horizontal period and the second active state of the first scan signal is maintained during the (n + 2) th horizontal period; The first active state of the second scan signal is maintained during the nth horizontal period, and the second active state of the second scan signal is maintained during the (n + 1) th horizontal period.

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

Wherein the first and second scan signals each represent two active states per frame period; The first active state of the first scan signal is maintained during the nth horizontal period, the second active state of the first scan signal is maintained during the (n + 1) th horizontal period; The first active state of the second scan signal is maintained during the n-th horizontal period, and the second active state of the second scan signal is maintained during the (n + 2) -th horizontal period.

According to another aspect of the present invention, there is provided a display device including first to third pixels arranged 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 the first data line and the first pixel; A second switching element controlled by a second scan signal from the second gate line to connect the first data line and the second pixel; A third switching element controlled by a first scan signal from the first gate line to connect the node between the first data line and the node; And a fourth switching element controlled by a second scan signal from the second gate line to connect the node to the third pixel.

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

First, the readability of a character can be improved by locating a red pixel, a green pixel and a blue pixel constituting a unit pixel in the horizontal direction.

Second, manufacturing cost can be reduced by connecting these red pixels, green pixels, and blue pixels in common to one data line while individually connecting each pixel to the gate lines to reduce the number of data lines.

1 is a view showing a display device according to an embodiment of the present invention.

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 for displaying an image are formed, A data driver for supplying image data to the data lines DL1, DL2, ... of the liquid crystal panel, and a data driver for supplying image data to the data lines GL1, GL2, And a timing controller for controlling driving of the gate driver and the data driver.

A red pixel, a green pixel and a blue pixel 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 a horizontal synchronization signal, a vertical synchronization signal, and a 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 reversal 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. The timing controller provides data drivers, various driving voltages required for the gate driver, and a gamma reference voltage required to generate the gamma voltage. The timing controller provides a gate high voltage corresponding to a high voltage of the scan pulse and a gate low voltage corresponding to a low voltage of the scan pulse.

The data driver samples the image data in accordance with the data control signal from the timing controller, latches the sampled image data one horizontal line per horizontal period (1H, 2H, ...), and outputs the latched image data to the data Lines. That is, the data driver converts the image data from the timing controller into analog pixel signals using the gamma voltage input from the gamma voltage generator, and supplies the analog pixel signals to the data lines. The data driver includes a plurality of data drive integrated circuits connected in series to the data lines.

The gate driver includes a shift register for sequentially generating scan signals in response to a gate start pulse of a gate control signal 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 the scan signals to the gate lines in response to the gate control signal. The gate driver includes a plurality of gate drive integrated circuits dividedly connected to the gate lines.

1, a pixel row is formed between the 2k-1th (k is a natural number) gate line and the 2kth gate line of the liquid crystal panel, and a plurality of pixels R, G, B 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. The unit pixels UPXL are commonly connected to one data line through the switching elements Tr1 to Tr4.

Here, the configuration of one unit pixel UPXL located on the first pixel line 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 elements SW1 and SW2 for connecting them to the first gate line GL1 and the first data line DL1. (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 and the red pixel R.

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

The third switching device 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 to each other.

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

The data lines and gate lines of Fig. 1 are supplied with signals as shown in Fig. 2A, or signals as shown in Fig. 2B are supplied.

First, as shown in FIG. 2A, the first and second scan signals SS1 and SS2 each indicate 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 maintained for the (n + 2) < maintain. The first active state of the second scan signal SS2 is maintained during the nth 1/3 horizontal period and the second active state of the second scan signal SS2 is maintained during the (n + 1) th 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.

Referring to one unit pixel UPXL located on the first pixel line in FIG. 1 and connected to the first data line DL1 and the signal shown in FIG. 2A, one unit pixel UPXL in the present invention The operation will be described in detail as follows.

During the first period T1, the first and second scan signals SS1 and SS2 are all kept in the active state, that is, the high state, and the blue image data Bd is supplied to the first data line DL1. The first scan signal SS1 in the high state is supplied to the first gate line GL1 and is supplied to the first and fourth switching elements Tr1 and Tr4 connected to the first gate line GL1 through the gate electrode, In turn. The second scan signal SS2 in the high state is supplied to the second gate line GL2 and is supplied to the second and third switching elements Tr2 and Tr3 connected to the second gate line GL2 through the gate electrodes, Tr3) are turned on.

The blue image data Bd from the first data line DL1 is supplied to the red pixel R through the turned-on first switching element Tr1. Further, the blue image data Bd from the first data line DL1 is supplied to the green pixel G through the turn-on second switching element Tr2. Further, 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.

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

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

During the second period T2, the first scan signal SS1 is maintained in an inactive state, that is, a low state, and the second scan signal SS2 is maintained in a previous active state, i.e., a high state. In this second period T2, green image data Gd is supplied to the first data line DL1. The first scan signal SS1 in the low state is supplied to the first gate line GL1 and is supplied to the first and fourth switching elements Tr1 and Tr4 connected to the first gate line GL1 through a gate electrode, Lt; / RTI > The second scan signal SS2 in the high state is supplied to the second gate line GL2 and is supplied to the second and third switching elements Tr2 and Tr3 connected to the second gate line GL2 through the gate electrodes, Tr3 in the turn-on state.

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 the green pixel G is updated to the green image data Gd supplied in the second period T2.

Thus, during the second period T2, the green pixel G is supplied with the green image data Gd.

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

During the third period T3, the first scan signal SS1 is changed back to the active state, that is, the high state, and the second scan signal SS2 is changed to the inactive state, that is, the low state. Further, the red data Rd is supplied to the first data line DL1 in the third period T3. The first scan signal SS1 in the high state is supplied to the first gate line GL1 and is supplied to the first and fourth switching elements Tr1 and Tr4 connected to the first gate line GL1 through the gate electrode, In turn. The second scan signal SS2 in the low state is supplied to the second gate line GL2 and the second and third switching elements Tr2 and Tr3 connected to the second gate line GL2 through the gate electrodes, Tr3 are turned off.

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 element Tr1. Therefore, the previous blue image data Bd stored in the red pixel R is updated with the red image data Rd supplied in the second period T2.

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

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

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

Referring to FIG. 2B, the first and second scan signals SS2 each indicate 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 maintained for the (n + 1) < 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 + 2) th 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.

Referring to one unit pixel UPXL located at the first pixel line in FIG. 1 and connected to the first data line DL1 and the signal shown in FIG. 2B, one unit pixel UPXL of the present invention The operation will be described in detail as follows.

During the first period T1, the first and second scan signals SS2 are all kept in the active state, that is, the high state, and the blue image data Bd is supplied to the first data line DL1. The first scan signal SS1 in the high state is supplied to the first gate line GL1 and is supplied to the first and fourth switching elements Tr1 and Tr4 connected to the first gate line GL1 through the gate electrode, In turn. The second scan signal SS2 in the high state is supplied to the second gate line GL2 and is supplied to the second and third switching elements Tr2 and Tr3 connected to the second gate line GL2 through the gate electrodes, Tr3) are turned on.

The blue image data Bd from the first data line DL1 is supplied to the red pixel R through the turned-on first switching element Tr1. Further, the blue image data Bd from the first data line DL1 is supplied to the green pixel G through the turn-on second switching element Tr2. Further, 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.

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

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

During the second period T2, the second scan signal SS2 is maintained in an inactive state, that is, a low state, and the first scan signal SS1 maintains the previous active state, i.e., the high state. In addition, red image data Rd is supplied to the first data line DL1 in this second period T2. The first scan signal SS1 in the high state is supplied to the first gate line GL1 and is supplied to the first and fourth switching elements Tr1 and Tr4 connected to the first gate line GL1 through the gate electrode, In turn. The second scan signal SS2 in the low state is supplied to the second gate line GL2 and the second and third switching elements Tr2 and Tr3 connected to the second gate line GL2 through the gate electrodes, Tr3 are turned off.

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 element Tr1. Therefore, the previous blue image data Bd stored in the red pixel R is updated with the red image data Rd supplied in the second period T2.

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

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

The second scan signal SS2 is again changed to the active state, that is, the high state, and the first scan signal SS1 is changed to the inactive state, that is, the low state, during the third period T3. Further, green image data Gd is supplied to the first data line DL1 in the third period T3. The second scan signal SS2 in the high state is supplied to the second gate line GL2 and the second and third switching elements Tr2 and Tr3 connected to the second gate line GL2 through the gate electrodes, In turn. The first scan signal SS1 in the low state is supplied to the first gate line GL1 and the first and fourth switching elements Tr1 and Tr2 connected to the first gate line GL1 through the gate electrodes, Tr4 are turned off.

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 the green pixel G is updated to the green image data Gd supplied in the third period T3.

Thus, during the third period T3, the green pixel G is supplied with the green image data Gd.

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

3 is a view illustrating a display device according to a second 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 display device according to the first embodiment of FIG. 1, and has a structure in which only one unit pixel UPXL 3 and the fourth switching elements Tr3 and Tr4 are different from each other.

Hereinafter, the structure of one unit pixel UPXL connected to the first data line DL1 in the first pixel row will be described.

One unit pixel UPXL includes a red pixel R, a green pixel G and a blue pixel B and a plurality of switching elements SW1 and SW2 for connecting them to the first gate line GL1 and the first data line DL1. (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 and the red pixel R.

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

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 to 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 display device according to the embodiment of the present invention may be supplied with the signals shown in FIG. 2A or FIG. 2B described above. 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 described above, the description thereof will be omitted.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. Will be clear to those who have knowledge of.

1 is a view showing a display device according to an embodiment of the present invention;

Figs. 2A and 2B are timing charts of signals supplied to the data line and the gate line of Fig.

3 is a view showing a display device according to a second embodiment of the present invention

Claims (6)

First to third pixels arranged in the horizontal direction along the first gate line and the second gate line to display one unit image; A first switching element controlled by a first scan signal from the first gate line to supply image data from the data line to the first pixel; A second switching element controlled by a second scan signal from the second gate line to supply image data from the data line to the second pixel; A third switching device controlled by a second scan signal from the second gate line to connect the data line and the node; And And a fourth switching element controlled by a first scan signal from the first gate line and supplying image data output from the data line and supplied through the node to the third pixel. The method according to claim 1, And the image data is supplied to the data line in order of the third pixel image data, the second pixel image data, and the first pixel image data in every horizontal period. 3. The method of claim 2, Wherein the first and second scan signals each represent two active states per frame period; Wherein the first active state of the first scan signal is maintained during the nth horizontal period and the second active state of the first scan signal is maintained during the (n + 2) th horizontal period; Wherein the first active state of the second scan signal is maintained during the nth horizontal period and the second active state of the second scan signal is maintained during the (n + 1) th horizontal period. The method according to claim 1, And the image data is supplied to the data line in order of the third pixel image data, the first pixel image data, and the second pixel image data in every horizontal period. 5. The method of claim 4, Wherein the first and second scan signals each represent two active states per frame period; The first active state of the first scan signal is maintained during the nth horizontal period, the second active state of the first scan signal is maintained during the (n + 1) th horizontal period; Wherein the first active state of the second scan signal is maintained during the nth horizontal period and the second active state of the second scan signal is maintained during the (n + 2) th horizontal period. First to third pixels arranged in the horizontal direction along the first gate line and the second gate line to display one unit image; A first switching element controlled by a first scan signal from the first gate line to supply image data from the data line to the first pixel; A second switching element controlled by a second scan signal from the second gate line to supply image data from the data line to the second pixel; A third switching element controlled by a first scan signal from the first gate line to connect the data line and the node; And And a fourth switching element controlled by a second scan signal from the second gate line and supplying image data output from the data line and supplied through the node to the third pixel.

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