JPH03135522A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain an optional display having different screen image resolution of other than n or 1/n times (n: integer) in the same LCD device by forming at least two or more kinds of picture elements whose picture element pitches are different on one panel surface and successively and repeatedly arranging picture element groups which have different pitches. CONSTITUTION:An electrode 11ij containing a TFT in every picture element is disposed in two-dimensional state on a transparent substrate constituting the LCD device. The value of the pitch of the electrode 11ij is designed so that the value on an even number line may be different from that on an odd number line, and the pitch on the even number line is designed so as to be two-thirds times as much as that on the odd number line. Then, 768 electrodes are disposed on the even number line, and 512 electrodes on the odd number line. As for the group of the picture elements, the 1st group of the picture elements is constituted of the picture elements on the even number line having the pitch of two-thirds times, and the 2nd group of the picture elements is constituted of the picture element on the odd number line. Thus, the display having different screen image resolution of other than n or 1/n times (n: integer) can be obtained by selecting the pitch corresponding to a display mode, therefore, not only the display can be easily viewed, but also an using extent as the display device can be enlarged.

Description

[Detailed Description of the Invention] The present invention relates to a liquid crystal display (hereinafter referred to as rLCp.,
In particular, the present invention relates to a liquid crystal display device that can select and display pixels with different pitches.

An active matrix driving method is used as one of the methods for driving a two-dimensional liquid crystal display device.

This active matrix driving method is based on the fact that each point 1 of each electrode 1 arranged two-dimensionally, as shown in FIG. 5(a),
The point is the basic unit of display, so for each of these pixels T
A switching element such as a PT (I-film transistor) is provided.

In order to drive the electrode 1 ij for display, the source of the TPT is connected to the source signal line 2, which is led out from the source driver 2.
In addition, the gate is connected to a gate signal line 3j derived from the gate driver 3, and when the gate signal line 3j is active, display data is transmitted from the source signal line 2 to the electrode 1.
Charged to ij.

In the two-dimensional liquid crystal display device, the display resolution is expressed by the total number of pixels in the horizontal and vertical directions. For example, if 768 pixels are arranged in the horizontal direction and 256 pixels are arranged in the pixel plane direction, the maximum display resolution of the panel is 768 x 256 dots. Figure 5(a) is an example of a panel with a maximum display resolution of 768 x 256 dots, and Figure 5(b) is an example of a panel with a maximum display resolution of 512 x 256 dots.
This is an example of a dot panel.

As the use of LCD devices has expanded, various types of information have come to be displayed.Depending on the display content, high resolution may be preferable, while others may require coarse images to be displayed. There are cases in which the purpose can be achieved even with a low resolution, and there is a need for a function that can realize displays of different resolutions with the same device.

In order to display images with different resolutions on the same device using the conventional LCD device described above, one dot of display data is displayed on a plurality of pixels. That is, if the same data is displayed on two pixels, the display resolution will be reduced to one-half, and if it is displayed on three pixels, the display resolution will be reduced to one-third. For example, if one dot of horizontal data is transferred to two pixels and displayed, the display resolution mentioned above will be 3.
It will be 84 x 256 dosoto.

In this way, the resolution that can be displayed on a conventional LCD panel is limited to the maximum display resolution and an integer fraction thereof, so other resolutions, such as a 768 x 256 dot display mode and a 512 x 256 dot display mode, are possible. It was not possible to display both modes on the same LCD panel.

The present invention was devised in view of these points.
It is an object of the present invention to enable display of any different screen resolution other than an integral multiple or a fraction of an integral number on the same LCD device.

In order to achieve the above object, the present invention provides an active matrix drive type liquid crystal display device in which a driving element is provided for each pixel, at least two pixels having different pixel pitches.
A liquid crystal display device is constructed by forming more than one type of pixels on one panel surface and sequentially and repeatedly arranging pixel groups with different pitches.

In addition, for pixel groups with different pinches, the number of signal lines corresponding to the pixel group with the finest pixel pitch is derived, and for pixel groups with a large pixel pitch, the signal lines are thinned out and routed, and the screen display mode A liquid crystal display device is constructed by selectively displaying one pixel group.

To facilitate understanding of the operation, a liquid crystal display device will be described that includes a pixel group in which two types of pixel rows with different pitches are arranged alternately in the vertical direction.

For example, 768 x 256 display mode and 512
When displaying the ×256 dot display mode on the same panel, a first pixel group with a pixel pitch corresponding to 768 dots horizontally and a second pixel group with a pixel pitch corresponding to 512 dots horizontally are displayed in the vertical direction. 256 lines each are arranged alternately. Furthermore, 768 source signal lines and 512 gate signal lines are provided.

Here, when displaying in 768 x 256 dot mode, only the gate signal lines wired to the first pixel group described above are sequentially driven, and display data for 768 horizontal dots is sent to the source signal line. In addition, when displaying in 512 x 256 dots mode, only the gate signal lines wired to the second pixel group described above are sequentially driven, and the display data for 512 horizontal dots is wired to each electrode on the source signal line. It is then thinned out and sent out. Therefore, in each display mode, only half of the lines are active at the same time. In this way, the LCD panel as a whole has 768 x 256 dots in the 768 x 256 dots display mode, but 51
2 x 256 when in soto display mode 512 x 2
56 donoto are displayed respectively.

As an example, the present invention will be described using a case where a 768 x 256 display mode and a 5]2 x 256 display mode, two-thirds of the 768 x 256 display mode, are displayed on the same panel.

Figure 1 shows a black and white L using the active matrix drive method.
A CD device is shown. The transparent substrate that makes up the LCD device includes
As has been conventionally used in active matrix drive type liquid crystal display devices, an electric field including a TPT is provided two-dimensionally for each pixel. Here, the electrode 11. The pitch of J is designed to be a different value for even-numbered rows and odd-numbered rows, and in the tree embodiment, the pitch of even-numbered rows is designed to be two-thirds that of odd-numbered rows. Therefore, 768 electrodes are arranged in even-numbered rows, and 512 electrodes are arranged in odd-numbered rows. In the above pixel group, pixels in even numbered rows having a pitch of two-thirds make up a first pixel group, and pixels in odd numbered rows make up a second pixel group.

With respect to the display panel surface on which the electrode 11i is provided,
Each electrode 111 is located around the panel. A source driver 12 and a gate driver 1 for driving the TPT built in the
3 is provided. Source signal line 14 led out from source driver 12. is connected to the source of the TFT,
Further, a gate signal line 15j drawn out from the gate driver 13 is connected to the gate of the TPT. Corresponding to the number of pixels, 768 source signal lines and 512 gate signal lines are drawn out from each driver.

The source signal line 14 is wired in common to the electrodes of pixels located in the same column, but as mentioned above, the electrode pitch is different between even and odd rows, so it is drawn out for even rows. All source signal lines 14. is connected to the source of the TPT included in the first pixel group at any corresponding position.

On the other hand, since the number of pixels in odd-numbered rows is small, in this example, as shown in FIG. 1, two source signal lines are included in the second pixel group in units of three. T
The remaining one is connected to the source of the PT, and the remaining one is connected to the source of the PT.
The wires pass through the spaces between the electrodes in the odd rows as wiring without being connected to the electrodes. Gate signal line 15. Since there is no change in pitch for gate signal line 15.
are commonly connected to the gates of TPTs located in the same row. The gate driver 13 can output a drive signal regardless of the display mode, but it can also be configured by switching the gate signal line that derives the drive signal for either odd-numbered rows or even-numbered rows depending on the display mode.

In the LCD device with the above electrode structure, 768 x 25
When the 6-dot display mode is set, the even-numbered row gate signal lines 15jY, , Y, . . . YS corresponding to the first pixel group
I. are sequentially activated, and on the other hand, on the source driver side, the source signal line 14. is selected with black and white display data corresponding to each pixel. sent to.

The pixel configuration of the panel surface in the above display mode is shown in Figure 2 (
As shown in a), small pixels are arranged in every other row, and the data of each dot is expressed using coordinates (X.

If expressed using the format y), the dot configuration of the entire display screen will be as shown in FIG. 3(a). Also 512 x 256
When the dot display mode is set, the gate signal lines 15, Y, , Y, . . . Y3 . are sequentially activated, and on the other hand, on the source driver side, the source signal line 14. is selected with black and white display data corresponding to each pixel. sent to.

In this case, the pixel configuration of the panel surface in the display mode is as shown in Figure 2(b), in which large pixels are arranged in every other row, and the data of each dot is similarly expressed using coordinates (x, y).
If expressed using the format, the dot configuration of the entire display screen will be as shown in FIG. 3(b).

Here, in the second pixel group, one out of three source signal lines has no pixel electrode connected to it, so dummy data is sent to this source signal line.

Figure 4 shows the data sent to each electrode point.
FIG. 4 is a diagram comparing the above two display modes.

By arranging pixels with different pitches on the same surface in advance, 76 pixels can be displayed as described above by switching according to the display mode.
Screen displays with different resolutions of 8 x 256 and 512 x 256 dots can be selected. Since the display resolution can be switched between the display modes in a range smaller than l, an appropriate mode can be set without causing any discomfort on the display screen.

As described above, according to the present invention, by arranging pixels with different pinches on the same surface in advance, pixels other than an integral multiple or a fraction of an integral number can be displayed by selecting the pitch according to the display mode. You can get different screen resolution display. Therefore, OA
As a display means of an information processing device such as a device, it is possible to display a screen with a resolution according to the purpose by switching in the same device, and not only makes the display easier to see, but also aims to expand the range of use as a display device. Can be done.

[Brief explanation of the drawing]

FIG. 1 shows T11i of an LCD device showing one embodiment of the present invention.
2 is a diagram showing the configuration of dots in each display mode of the same embodiment, FIG. 3 is a diagram showing the relationship between dots and coordinates in each display mode of the same embodiment, and FIG. 4 is a diagram showing the relationship between dots and coordinates in each display mode of the same embodiment. Figures 5(a) and 5(b), which show the relationship between electrodes and data to be sent out, are diagrams showing a conventional LCD device. 11rr--one electrode, 12--source driver. 13-gate driver, 14. ...Source signal line. 154--Gate signal line.

Claims (2)

[Claims] (1) In an active matrix drive type liquid crystal display device in which a driving element is provided for each pixel, at least two types of pixels with different pixel pitches are formed on one panel surface, and pixel groups with different pitches are repeated. A liquid crystal display device characterized by being arranged in an array. (2) Deriving the number of signal lines corresponding to the pixel group with the finest pixel pitch, thinning out and wiring the signal lines for pixel groups with large pixel pitch, and selectively displaying one pixel group depending on the screen display mode. The liquid crystal display device according to claim 1, characterized in that: