JPH0281027A - X-y matrix type liquid crystal gradation display element - Google Patents

Abstract

PURPOSE:To provide the liquid crystal gradation display which can make gradation display without flickering even if the gradation is changed by dividing respective X-electrodes to plural pieces of electrodes with one dot of respective display dots and selecting the X divided electrodes according to the display gradation. CONSTITUTION:One display dot 5 is substantially quadrisected by a piece of Y electrode 4 and 4 pieces of the X divided electrodes 3a to 3d. A prescribed common side driver 1 is driven by a common driving signal (A) by which a drive signal is impressed to the prescribed Y electrode 4. On the other a gradation data signal B is inputted to a specific X electrode driving and selecting circuit 2. The X electrode driving and selecting circuit 2 selects a prescribed number of the X divided electrodes 3a to 3d according to the display gradation instructed by a gradation data signal B and impresses the drive signal thereto. The orientation of the liquid crystal in the electrode parts which are the intersected points of the respective electrodes in X and Y directions is changed and contrast is generated when the signals are impressed to the respective electrodes. Since the gradation display is possible without changing the driving duty, the gradation display without flickering is executed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an X-Y display that improves gradation display and prevents flickering.
The present invention relates to a matrix type liquid crystal gradation display element.

[Prior Art] In conventional liquid crystal gradation display elements of this type, frames are thinned out in order to display gradation, and gradation is expressed by such pseudo gradation display.

[Problem to be Solved by the Invention] However, in the conventional liquid crystal gradation display element that employs the above-mentioned gradation display means, there is a problem in that when the gradation is lowered, flickering due to flickering occurs. The drawback was that there was a restriction on the number of gradations.

The present invention has been made in view of such problems, and includes:
An object of the present invention is to provide a liquid crystal gradation display element capable of displaying gradations without flickering.

[Means for Solving the Problems] The X-Y matrix type liquid crystal gradation display element according to the present invention has the following features:
In an X-Y matrix liquid crystal gradation display element in which a display dot is formed by a plurality of X electrodes and a plurality of Y electrodes arranged in the X direction and a Y direction, each X electrode has a plurality of The display is characterized in that it is divided into X-divided electrodes, and is provided with an X-electrode drive selection circuit that selects the X-divided electrodes according to the display gradation.

[Operation] In the present invention, since the X electrode of each display dot is divided into a plurality of X-divided electrodes, the X-electrode drive selection circuit selects the X-divided electrode to be driven according to the display gradation. By doing so, gradation display can be achieved. In this way, gradation display is possible without changing the drive duty, so even if the number of gradations is increased, gradation display without flickering is possible.

[Example] Next, an example of the present invention will be described with reference to the attached drawings.

FIG. 1 is a diagram showing the structure of a gradation display element according to an embodiment of the present invention, and this embodiment is an example in which the display driver l-11' is divided into four parts about the X electrode to perform gradation display. It is.

Display dots 1 to 5 indicated by broken lines are one Y electrode 4
and four X-divided electrodes 3a.

It consists of 3b, 3c, and 3d. Each X-divided electrode 3a,
3b, 3c, and 3d are formed so as to occupy a square area obtained by substantially dividing one display dot into a quarter.

The gradation data signal B applied to the display element is input to the X electrode drive selection circuit 2, and the X electrode drive selection circuit 2 selects four drive electrodes 3a according to the gradation.

Selectively drive one of 3b, 3c, and 3d.

On the other hand, the common side drive signal A is input to the common side driver 1 provided for each Y electrode 4, and the common side driver 1 is driven by this common side drive signal A.
A drive signal is applied to the electrode 4.

In the liquid crystal gradation display element configured in this manner, a predetermined common side driver 1 is driven by the common drive signal A, and thereby a drive signal is applied to a predetermined Y electric field fi4. On the other hand, the gradation data signal B is input to a specific X electrode drive selection circuit 2, and this X electrode drive selection circuit 2 divides into a predetermined number of Type f! 3a, 3b, 3c, and 3d are selected and a drive signal is applied. Then, when a signal is applied to each electrode in the X and Y directions, the orientation of the liquid crystal at the electrode portion that is the intersection of the signals changes, resulting in contrast.

FIG. 2 shows a one-dot display pattern when gradation display is performed using the electrode structure shown in FIG. That is, 1
The gradation display dot 6 is generated when only the X-divided electrode 3a is driven, the 2-gradation display dot 7 is generated when the X-divided electrodes 3a and 3c are driven, and the 3-gradation display dot 8 is generated when the X-divided electrode 3a and 3b are driven.
, 3c, the four-gradation display dot 9 is the X-divided electrode 3a.

This is a display pattern obtained when all of 3b, 3c, and 3d are driven. In this way, a four-gradation display is realized with display dot 9 being the maximum gradation.

[Effects of the Invention] As explained above, according to the present invention, gradation display is possible without changing the drive duty, so even if the number of gradation levels is increased, gradation display without flickering can be performed. Therefore, it is possible to further increase the number of gradations by further making the electrode structure finer.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the structure of a liquid crystal gradation display element according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing an example of a four-gradation display pattern according to this embodiment. 1; Common side driver, 2. X electrode drive selection circuit, 3a
, 3b, 3c, 3d; key display dot,
A: Common drive signal, B: Gradation data signal

Claims (1)

[Claims] (1) In an X-Y matrix liquid crystal gradation display element in which display dots are formed by a plurality of X electrodes and Y electrodes arranged in the X direction and Y direction, each X electrode corresponds to one display dot. 1. An X-Y matrix type liquid crystal gradation display element, characterized in that it is divided into a plurality of X-divided electrodes, and is provided with an X-electrode drive selection circuit that selects the X-divided electrodes according to the display gradation.