JPH0572996A - Liquid crystal display body - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a large-screen liquid crystal display with a large number of pixels without increasing the drive duty ratio. [Structure] Regions 1a to 1d obtained by dividing a plurality of scanning electrodes into four equal parts
Are used as display areas, and wiring lines for the display electrodes forming the display areas 1b and 1c are formed between the display electrodes of the display areas 1a and 1d. [Effect] Since the display signal is applied to the display electrodes in the display area distant from the input section for applying the display signal, a large screen with a large number of pixels is provided by providing a large number of display areas to which a common scanning signal is applied. The liquid crystal display of is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dot matrix type liquid crystal display.

[0002]

2. Description of the Related Art A dot-matrix type liquid crystal display has a plurality of scanning electrodes arranged in one direction and a plurality of display electrodes arranged in a direction orthogonal to the scanning electrodes, depending on the required number of vertical and horizontal pixels of a display screen. The number of scan electrodes and display electrodes is determined.

FIG. 4 shows the structure of a conventional general simple dot matrix type liquid crystal display and a display device using the same. In FIG. 4, reference numeral 1 denotes a liquid crystal display body formed by intersecting a plurality of scanning electrodes and a plurality of display electrodes, and 1a and 1b.
Are two display areas in the display screen. Scan electrode drivers 3a and 3b give scan signals to the scan electrodes of the display areas 1a and 1b, respectively. Display electrode drivers 2a and 2b give display signals to the display electrodes formed in the display areas 1a and 1b, respectively. In this way, the display area of the liquid crystal display body is divided into two, the display electrodes are driven from both sides, and a common scanning signal is given to the two display areas, so that the display electrodes are driven at a duty ratio of 1/2 of the number of scanning electrodes. is doing.

[0004]

However, when driving a liquid crystal display of the simple dot matrix type, the practical maximum duty ratio is about 1/480, and the number of scanning electrodes exceeds 480 × 2 = 960. It was not possible to drive a large-screen liquid crystal display.

An object of the present invention is to provide a liquid crystal display body capable of increasing the number of display pixels without increasing the drive duty ratio.

[0006]

A liquid crystal display according to a first aspect of the present invention is a liquid crystal display in which a plurality of scan electrodes are arranged in one direction and a plurality of display electrodes are arranged in a direction orthogonal to the scan electrodes. In, a plurality of scan electrodes are equally divided into three or more areas, each of which is defined as a display area. Within the display area, a display electrode forming the display area and a wiring line for display electrodes forming the other display areas are formed. Is formed.

According to a second aspect of the present invention, there is provided a liquid crystal display body in which a plurality of scan electrodes are arranged in one direction and a plurality of display electrodes are arranged in a direction orthogonal to the scan electrodes. Areas that are equally divided into three or more are defined as display areas, and display lines that form the display area and wiring lines for display electrodes that form other display areas are formed in the display area. Is connected to a charge storage driving element, and a selection circuit for selectively controlling these driving elements is provided.

[0008]

In the liquid crystal display device according to the first aspect of the present invention, the respective areas obtained by equally dividing the plurality of scanning electrodes into three or more parts are used as the display areas. In each display area, a wiring line for a display electrode forming the display area and a display electrode forming another display area is formed. That is, it is possible not only to drive the display electrodes from two opposite sides of the liquid crystal display as in the conventional case, but also to drive the display electrodes in another display region beyond a certain one display region. Since the number of divisions of the display area is equal to or more than three, the equal fraction is N and the duty ratio is 1 / D.
Then, it is possible to provide scan electrodes corresponding to the number of D * N.

According to another aspect of the liquid crystal display device of the present invention, the charge storage driving elements are further connected to the lead-out portions of the respective display electrodes, and a selection circuit for selectively controlling these driving elements is provided. Therefore, the display signal can be applied to each display electrode by time-divisionally applying the display signal to the charge storage driving element via the selection circuit.
In this case, if the number of selectable selection circuits is S, the number of display signals connected to the liquid crystal display is 1 / S. Therefore, despite the increase in the number of pixels, the number of signals to be connected to the liquid crystal display does not increase, and the display control circuit can be connected by a method (connection accuracy) similar to the conventional method.

[0010]

1 to 3 show the structure of a liquid crystal display body and a liquid crystal display device using the same according to an embodiment of the present invention.

FIG. 1 is a diagram showing a structure of a liquid crystal display and a method of connecting a drive circuit for driving the liquid crystal display. 1 in FIG.
Reference numerals a, 1b, 1c and 1d denote display areas of a liquid crystal display body in which scanning electrodes (not shown) are arranged in the vertical direction and display electrodes are arranged in the horizontal direction in the drawing. In this example, a plurality of scan electrodes are divided into four equal parts to form four display areas.

In FIG. 1, the intervals between the display areas are drawn separately, but the intervals between the scanning electrodes are uniform over the entire area of the display screen, as will be described later. Display areas 1b and 1c
Only the display electrodes are formed in the lateral direction. Display area 1a
In addition to the display electrodes forming the display area 1a, wiring lines for the display electrodes forming the display area of the display area 1b are formed. In the display area 1d, wiring lines for the display electrodes of the display area 1c are formed together with the display electrodes that form the display area 1d. Display electrode driver 2
In response to the display control signal, a drives the display electrodes of the display area 1a and the display area 1b, respectively. The display electrode driver 2b receives the display control signal and drives the display electrodes of the display area 1c and the display area 1d, respectively. The scan electrode drivers 3a to 3d have display areas 1a to 1d.
Drive the scanning electrodes of. The same timing signal is given to these scan electrode drivers 3a to 3d,
A common scanning signal is output to the scanning electrodes in each of the display areas 1a to 1d. For example, assuming that the number of pixels in the horizontal direction in FIG. 1 is 1200 dots, one display area obtained by dividing this into four equal parts is composed of 300 scanning electrodes. Therefore, in this case, the entire liquid crystal display can be time-divisionally driven at a duty of 1/300.

FIG. 2 shows the shapes of the display electrodes and the scanning electrodes and the structure of the circuit provided on the liquid crystal display. In FIG. 2, Lxa1, Lxa2, ... Are display electrodes forming the display area 1a in FIG. Also, Lxb1, Lx
Reference numerals b2, ... Represent display electrodes forming the display area 1b. Similarly, Lxc1, Lxc2, ... Are display areas 1
Display electrodes Lxd1, Lxd2, ... Constituting c are display electrodes constituting the display area 1d. Also, Lya
1 is one of the scanning electrodes forming the display area 1a, Lyb1
Is one of the scan electrodes forming the display area 1b, Lyc1 is one of the scan electrodes forming the display area 1c, and Lyd1 is one of the scan electrodes forming the display area 1d. Lsb
, Lsb2, ... Are wiring lines for the display electrodes in the display region 1b, and Lsc1, Lsc2, ... Are wiring lines for the display electrodes Lxc1, Lxc2 ,. An insulating layer is formed on each wiring line in order to prevent an electric field from being applied to the liquid crystal layer between the wiring lines and the scanning electrodes facing each other. FIG. 3 is a sectional view showing the structure of that portion. In FIG. 3, Lxa is a display electrode in the display area 1a and constitutes a display pixel with the scanning electrode Ly. Lsb is a wiring line, on which an insulating layer 4 is formed. Thereby, the wiring line Ls
This prevents the display pixel from being formed between b and the scan electrode Ly.

Now, returning to FIG. 2, 5a1, 5b1, 5
a2, 5b2, ..., 5d1, 5c1, 5d2, 5c
2, ... are charge storage transistors,
Each is connected to the display electrode or the end of the wiring line. 6a, 6b, 6c, 6d and the like are selectors for selectively driving the transistors. For example, the selector 6a outputs the input signal Dna to the gate of the transistor 5a1 or 5b1 according to the state ("H", "L") of the selection signal SEL. The selector 6b outputs the input signal Dnb to the gate of the transistor 5a2 or 5b2 according to the state of the selection output SEL. With this configuration, the display areas 1a and 1d are driven simultaneously, and the display areas 1b and 1c are driven.
Are simultaneously driven, and this is repeated alternately. At that time, in order to suppress the flickering of the display, it is necessary to set the repetition cycle to 60 Hz or more. By thus providing the line charge storage transistor and the selector on the liquid crystal display body, it is possible to reduce the number of connection contacts between the liquid crystal display body and the display control circuit.

In the embodiment, the scanning electrode is divided into four equal parts and divided into four parts.
Although one display area is formed, three display areas may be formed. Alternatively, five or more display areas can be formed. In that case, wiring lines may be respectively formed in the display area on the input side (upstream side) of the display signal for the display electrodes forming the plurality of downstream display areas.

[0016]

According to the liquid crystal display of the first and second aspects of the present invention, the number of pixels can be dramatically increased without extremely increasing the duty ratio.

In addition, in the liquid crystal display device according to the second aspect, the number of contact points for connecting the display signal to the liquid crystal display device is reduced despite the increase in the number of signals of the display electrodes, and the same accuracy as the conventional one is achieved by the TAB technique or the like. Can be connected to the display control circuit.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a liquid crystal display body and a drive circuit connected thereto, which is an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a circuit provided on a display electrode, a scan electrode, and a liquid crystal display body.

FIG. 3 is a partial cross-sectional view showing a structure of a wiring line portion of a liquid crystal display body.

FIG. 4 is a diagram showing a configuration of a conventional liquid crystal display and its drive circuit.

[Explanation of symbols]

 1 Liquid Crystal Display 4 Insulating Layer 5 Line Charge Storage Transistors 1a to 1d Display Area Lx Display Electrode Ly Scanning Electrode Ls Wiring Line

Claims (2)

[Claims] 1. A liquid crystal display body comprising a plurality of scan electrodes arranged in one direction and a plurality of display electrodes arranged in a direction orthogonal to the scan electrodes, wherein a plurality of scan electrodes are equally divided into three or more regions. And a wiring line for a display electrode that constitutes another display area, and a wiring line for a display electrode that constitutes another display area. 2. A liquid crystal display body comprising a plurality of scan electrodes arranged in one direction and a plurality of display electrodes arranged in a direction orthogonal to the scan electrodes, wherein a plurality of scan electrodes are equally divided into three or more regions. As the display area, and in the display area, the wiring lines for the display electrodes forming the display area and the display electrodes forming the other display areas are formed, and the charge storage driving element is provided in the lead-out portion of each display electrode. A liquid crystal display body, which is provided with a selection circuit which is connected and selectively controls these drive elements.