JP3207779B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device having a color filter in which three primary colors are arranged in a stripe on an electrode substrate.

[0002]

2. Description of the Related Art In recent years, as information devices have become more sophisticated, display devices have been required to have higher definition and more functions, and various display devices have the advantages of small size, light weight, and low power consumption. 2. Description of the Related Art A liquid crystal display device is frequently used as a display device of an information terminal or the like such as a personal computer, and in recent years, a color liquid crystal display device using a color filter has been widely used.

Conventionally, in a color liquid crystal display device, as shown in FIGS. 7 and 8, a liquid crystal composition is sealed between an array substrate and a counter substrate, and an image can be displayed in a single display mode. As shown in FIG. 8, a color formed by patterning three primary colors of red (R), green (G), and blue (B) in a stripe pattern on either the array substrate or the opposing substrate of the simple liquid crystal panel 1. A filter 2 is provided, and a red (R) dot 3a, a green (G) dot 3b, which is displayed through three adjacent red (R), green (G), and blue (B) stripes, The color pixel 3 is constituted by three primary color dots of the blue (B) dot 3c.

That is, when displaying white, all the red (R) dots 3a, green (G) dots 3b, and blue (B) dots 3c are displayed, while displaying black. , All of the red (R) dot 3a, the green (G) dot 3b, and the blue (B) dot 3c are set to the non-display state. In addition, when displaying other colors, color display is performed by displaying dots of three primary colors at an appropriate ratio based on the principle of additive color mixture.

[0005] The entire liquid crystal display device is formed by arranging one color pixel composed of the dots of the three primary colors as one unit and arranging them vertically and horizontally in a matrix. This pixel arrangement pattern is called a normal display mode, and is a VGA mode (640 × 480), SVGA
Mode (800 horizontal x 600 vertical), XGA mode (10 horizontal
24 x 768), SXGA mode (1280 x 1)
024) are widely used.

Conventionally, for color display in each of such display modes, a unique liquid crystal panel having a specific number of color pixels has been designed and manufactured for each display mode.

On the other hand, in recent years, a general-purpose display device used for a computer device is generally capable of displaying a plurality of display modes on the same display screen with good display quality. VGA mode (width 64)
0, height 480), SVGA mode (width 800, height 60)
0), XGA mode (1024 horizontal, 768 vertical) and the like, and these display modes are realized by a CRT display device. With the spread of personal computers that are small and light and have low power consumption, there has been a demand for the use of small, lightweight and low power consumption liquid crystal display devices instead of such general-purpose display devices comprising cathode ray tubes.

[0008]

However, in the liquid crystal display device, a dedicated liquid crystal panel having a specific number of color pixels corresponding to each display mode is designed and manufactured. There was a problem that the display could not be performed in a plurality of display modes because of the inability to support the modes. However, a liquid crystal panel dedicated to the VGA mode with a small number of pixels is a liquid crystal panel designed exclusively for a display mode with a large number of pixels, although it cannot support display modes with a large number of pixels, such as the SVGA mode and XGA mode. If an attempt is made to display in a display mode with a small number of pixels under the condition that the pixel size is the same, display is possible, but in this case, the size of the display screen is significantly different depending on the display mode, For example, when a display in the VGA mode is performed on a liquid crystal panel designed for the XGA mode, the size of the display portion is significantly reduced to about 63% of that in the XGA mode, and the display screen cannot be used effectively. Was occurring.

For this reason, a method of appropriately complementing dots to make the size of the display screen the same is sometimes used. However, in this case, fine irregularities appear on the display of characters and figures, and the display quality is reduced. Another problem is that the liquid crystal display device is remarkably deteriorated, and a small, lightweight, low power consumption liquid crystal display device cannot be applied as a computer display device in place of a CRT display device.

The present invention has been made to solve the above-mentioned problems, and when performing color display in a plurality of display modes with one liquid crystal display device, the display screen size is substantially the same without deteriorating the display quality. VGA mode (width 64)
0, height 480), SVGA mode (width 800, height 60)
0), a plurality of display modes such as an XGA mode (1024 horizontal and 768 vertical) as a standard display mode can be applied as a display device of a computer, and the computer display device can be reduced in size and weight and reduced in power consumption. It is an object of the present invention to provide a liquid crystal display device that can achieve the above.

[0011]

According to the present invention, there is provided an array substrate having pixel electrodes arranged in a matrix, an opposing substrate having a common electrode and being arranged opposite to the array substrate. A liquid crystal composition sealed between the array substrate and the opposing substrate, and a color filter layer formed on at least one of the array substrate and the opposing substrate and sequentially arranged in a stripe of three primary colors ;
A plurality of display modes including a display mode and a second display mode.
In the liquid crystal display device capable of displaying the first display , the first display
When displaying the mode, the color filter layer
One color with three dots adjacent in the width direction of the rice
When configuring the pixel and displaying the second display mode,
Before, comprising at least three primary colors of the color filter layer
4 or more dots adjacent in the width direction of the stripe
One color pixel.

[0012]

According to the above configuration, the three primary colors are selected from among four or more dots by using the common stripe color filter layer, and the color pixels composed of the three primary colors dots, despite the different display modes. Can display a color image of the same size and good display quality on the same liquid crystal display device, and can be applied to a display device of a computer having a plurality of display modes as standard display modes. A liquid crystal display device capable of reducing the size and weight of the device and reducing power consumption can be obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. 10 is an array substrate 1
1 is a liquid crystal display device in which a liquid crystal composition 13 is sealed between a counter substrate 12 and a glass substrate 1 of an array substrate 11.
4, a thin film transistor (hereinafter abbreviated as TFT).
A pixel electrode 17 made of indium tin oxide (hereinafter abbreviated as ITO) driven by 16 has a width of 1024 × 7.
68, a protective film 18 is further formed, and an alignment film 20 is applied. As a result, the liquid crystal display device 10 operates in the XGA mode, the SVGA mode,
Display in the VGA mode is enabled.

Next, on the counter substrate 12, a color filter layer 22 is formed on a glass substrate 21 by arranging three primary colors of red (R), green (G), and blue (B) in a stripe shape. And a common electrode 24 made of ITO via a planarizing layer 23.
Is formed, and a protective film 26 is further formed thereon.
7 is applied. Here, 3 of the color filter layer 22
The primary color stripes are three or four of the three primary colors red (R), green (G), and blue (B) on color pixels 36, 37, and 38, which will be described later, during display in the XGA, SVGA, and VGA modes. 3 × 102 so that the book and the 5 stripes correspond
It has a minimum number of 3200 which covers 4, 4 × 800 and 5 × 640.

The alignment films 20, 2 of the substrates 11, 12
7 is rubbed, the two substrates 11 and 12 are assembled facing each other to form a cell, the liquid crystal composition 13 is injected into the gap and sealed, and then the polarizing plates 28 and 30 are attached and the liquid crystal panel 31 is mounted. To form A driving circuit 32 is provided on the liquid crystal panel 31.
Are mounted, and a signal line for driving the pixel electrode 17 and a scanning line driving IC device 33 are mounted.

In the liquid crystal display device 10 constructed as described above, the first mode, ie, 1024 (horizontal) × 768 (vertical) X
In the case of the GA mode display, as shown in FIG. 3, one color pixel 36 includes three stripes of three primary colors of red (R), green (G), and blue (B) adjacent to the color filter layer 22. Three primary color dots 36a, 36b, 36c used
Is formed.

The second mode of 800 × 600
In the case of the SVGA mode display, one color pixel 37
As shown in FIG. 4, red (R), green (G), blue (B), red (R), or green (G), blue (B), or at least three adjacent primary colors of the color filter layer 22 are included. Three primary color dots 37a, 37b, 37c or 37e, 37 using three stripes selected from four stripes such as red (R) and green (G).
f, 37 g and the like. Further, in the case of the VGA mode display of 640 (horizontal) × 480 (vertical), which is the second mode, one color pixel 38 includes red (R) including at least three adjacent primary colors in the color filter layer 22 as shown in FIG. , Green (G), blue (B), red (R), green (G) or blue (B), red (R), green (G), blue (B), red (R). Three primary color dots 38a using three stripes selected from the three stripes,
38c and 38e or 38f, 38h and 38j are used.

That is, when displaying in the XGA mode, color display is performed by selecting the necessary stripes by combining three stripes. On the other hand, when the image is displayed in the SVGA mode, one of the two stripes is used for one of the two stripes among the four stripes.
Color display is performed with three stripes combined with the remaining two colors. Further, in the case of displaying in the VGA mode, two colors of two stripes out of the five stripes have two colors.
One of the stripes is used, and color display is performed using three stripes combined with the remaining colors.

The selection of a stripe for each display mode when performing this color display is made by the driving circuit 32 and the signal line and scanning line driving IC device 33. That is, a logic circuit (not shown) such as a gate array provided in the driving circuit 32 and a signal line and scanning line driving IC device 33 for determining selection or non-selection of each dot for selecting each stripe. Is done. Each display mode can be set by an external signal or the like.

The color filter layer 22 is composed of 3200 stripes and can support color display in three different display modes of XGA, SVGA and VGA.
In the case of the XGA mode using 024 = 3072 stripes, the display area is reduced as compared with the other two modes. However, the difference is 4%, and even if it is a 13.3 inch liquid crystal display device, it is within an acceptable range because the length is about 0.5 inch.

According to this structure, in order to obtain a color display image in different display modes using the same liquid crystal display device 10, the color filter layer 22 in the XGA mode is selected according to the display mode. One color pixel 36 is displayed by three primary color dots 36a to 36c formed by combining three stripes. In the SVGA mode, three pixels selected from among the four stripes of the color filter layer 22 are displayed. 3 formed by combining stripes
1 by primary color dots 37a-37c, 37d-37f
The color pixels 37 are displayed, and in the VGA mode, three primary color dots 38a to 38c and 38d to 38f formed by combining three stripes selected from the five stripes of the color filter layer 22. By displaying one color pixel 38, a display screen of substantially the same size can be obtained as a whole display screen despite different display modes.

Moreover, unlike the conventional method, the method of complementing dots to make the size of the display screen the same is not used, so that the deterioration of display quality due to fine irregularities on characters and figures, which has conventionally occurred, is eliminated. A good display screen can be obtained without inviting.

Therefore, a small, lightweight, and low power consumption liquid crystal display device can be applied to a general-purpose display device for a computer having a plurality of display modes as standard display modes instead of the CRT display device. And lower power consumption can be realized.

It should be noted that the present invention is not limited to the above-described embodiment, but can be changed without departing from the spirit of the invention. For example, the display mode or the number of stripes of the three primary colors of the color filter layer can be determined by using a liquid crystal. It is optional depending on the purpose of use of the display device, and a color filter layer may be provided on either side of the array substrate or the counter substrate.

Further, as in the SVGA mode or the VGA mode in the above embodiment, with respect to a color in which two stripes exist in one color pixel, not only one of the stripes is used but, for example, FIG. As shown in the other modified example, three primary colors are selected from stripes of red 1 (R1) to red 2 (R2) or green 2 (G2) to green 3 (G3). Color pixel 4
In the case of configuring 0 and 41, the frame 1 is formed by selecting stripes of red 1 (R1), green 1 (G1), and blue 1 (B1) as shown in FIG. Dot 40a ~
The color pixel 40 is constituted by the dot 40c, or
A color pixel 41 is formed by dots 41a to 41c formed by selecting green 2 (G2), blue 2 (B2), and red 3 (R3) stripes. ), Dots 40b to 40d formed by selecting green 1 (G1), blue 1 (B1), and red 2 (R2) stripes.
The color pixel 40 is constituted by the dot 40d, or
The color pixel 41 is composed of dots 41b to 41d formed by selecting blue 2 (B2), red 3 (R3), and green 3 (G3) stripes.
(R1), red 2 (R2) or green 2 (G2), green 3
(G3) stripes are alternately selected, red 1 (R1) dots 40a and red 2 (R2) dots 40d are alternately displayed, or green 2 (G2) dots 41a and green 3 (G
The one-color pixels 40 and 41 may be obtained by alternately displaying the dots 41d of 3).

In this manner, the entire surface within one color pixel 40, 41 appears to be displayed uniformly as compared with the above-described embodiment. That is, if there is a part that is not always displayed as in the embodiment, a specific pattern appearing by the set is conspicuous, which may cause a deterioration in display quality such as locally forming a black part. In the modified example, deterioration of display quality caused by such a cause is eliminated, and better display quality can be obtained. In addition, since the display area within one color pixel 40, 41 is increased, it is possible to prevent a decrease in the luminance of the entire display screen, thereby further improving the display quality.
The arrangement pattern and number of the pixel electrodes formed on the array substrate are also arbitrary.

[0028]

As described above, according to the present invention, when a color display image is obtained in a plurality of display modes using the same liquid crystal display device, a display screen of almost the same size can be easily obtained. In addition, fine irregularities on characters and figures appear as in the past, and good display quality can be obtained without deteriorating the display quality. As a result, the liquid crystal display device thus configured can be used in a plurality of display modes as standard. The present invention can be applied to a general-purpose display device for a computer provided as a dynamic display mode, and the size and weight of the computer display device and the power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the liquid crystal display device according to the embodiment of the present invention.

FIG. 3 shows an XGA in the liquid crystal display device according to the embodiment of the present invention.
FIG. 4 is an explanatory diagram showing one color pixel when displaying in a mode.

FIG. 4 is a diagram illustrating a liquid crystal display device according to an embodiment of the present invention.
FIG. 4 is an explanatory diagram illustrating one color pixel when displaying in the A mode.

FIG. 5 illustrates a VGA in the liquid crystal display device according to the embodiment of the present invention.
FIG. 4 is an explanatory diagram showing one color pixel when displaying in a mode.

6A and 6B are diagrams illustrating another modification of the present invention, in which FIG. 6A is an explanatory diagram illustrating dot positions forming color pixels in frame 1 and FIG. 6B is a diagram illustrating dot positions forming color pixels in frame 2; FIG.

FIG. 7 is a plan view showing a conventional liquid crystal display device.

FIG. 8 is an explanatory diagram showing dots constituting a color pixel in a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device 11 ... Array substrate 12 ... Counter substrate 13 ... Liquid crystal composition 16 ... TFT 17 ... Pixel electrode 22 ... Color filter layer 24 ... Common electrode 31 ... Liquid crystal panel 32 ... Driving circuit 33 ... Signal line and scanning line Driving IC device 36: XGA mode color pixel 37: SVGA mode color pixel 38: VGA mode color pixel 36a, 36b, 36c: XGA mode dot 37a, 37b, 37c: SVGA mode dot 38a, 38b, 38c ... dots in VGA mode

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/133 510 G02F 1/1335 505

Claims (3)

(57) [Claims] 1. An array substrate having pixel electrodes arranged in a matrix, a counter substrate having a common electrode and disposed opposite to the array substrate, and a liquid crystal composition sealed between the array substrate and the counter substrate. And a color filter layer formed on at least one of the array substrate or the counter substrate and sequentially arranging three stripe-shaped primary colors .
A plurality of displays including a first display mode and a second display mode
When displaying the first display mode in the liquid crystal display device capable of displaying the mode,
Three dots adjacent in the width direction of the filter layer stripe
Constitutes one color pixel, and sets the second display mode to
When displaying , at least three of the color filter layers
A liquid crystal display device, wherein four or more dots adjacent to each other in the width direction of the stripe including a primary color form one color pixel. 2. A color image comprising four or more dots.
When configuring the elementary color, only 3 dots including the 3 primary colors
Display, and the remaining dots are not lit.
The liquid crystal display device according to claim 1. 3. In the case where one color pixel is constituted by the four or more dots, the same color existing in one color pixel
2 dots contribute to the color display every predetermined period.
3. The liquid crystal display device according to claim 1, wherein