JPS5838800B2 - Multiple matrix liquid crystal display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display panel with a multi-matrix electrode structure.

M) I7 In a liquid crystal display panel having a box-shaped electrode structure, display is generally performed by line-sequential time-division scanning.

This is a method that sequentially selects one electrode group one by one from the electrode groups in the X direction and Y direction that make up the matrix, and in synchronization with this selects the electrodes from the other electrode group that are connected to the segment to be lit. It is.

Therefore, the voltage for lighting each segment is applied for only one period of one scan period, which is divided by the number of scanning lines.

For this reason, the upper limit of the number of short threads is said to be approximately 100, and in larger display devices, the occurrence of cross strokes,
Problems such as a decrease in the responsiveness of the liquid crystal occur.

Therefore, a liquid crystal display panel having a multi-matrix electrode structure has been proposed in order to increase the apparent number of scanning lines and make it possible to obtain a larger scale display.

(Japanese Patent Application No. 49-90856) Figures 1 to 3 show an example of a conventional multi-matrix liquid crystal panel.
The figure shows the electrode pattern formed on the upper plate of the two glass substrates, and FIG. 2 shows the electrode pattern formed on the lower plate.

To explain this, the picture element electrode 4 connected to the X electrode 1 on the upper plate and the picture element electrode 10 connected to the Y electrode 7 on the lower plate face each other to form one unit matrix, and The picture element electrode 5 connected to the Y electrode 2 on the lower plate and the picture element electrode 9 connected to the X electrode 6 on the lower plate face each other to form another unit matrix.

By performing line sequential scanning independently and in parallel for each unit matrix, the number of apparent scanning lines is increased,
A large-scale display device can be obtained.

However, a drawback of such conventional multi-matrix liquid crystal panels is that electrodes that should be insulated intersect with each other, resulting in a large number of insulated locations.

Reference numeral 3 in FIG. 1 and reference numeral 8 in FIG. 2 indicate insulating films for this purpose, and FIG. 3 further explains this with a sectional view.

In FIG. 3, 11 is a glass substrate, other symbols are in FIG. 1,
Each part explained in FIG. 2 is shown.

As you can see from this figure, a single-matrix liquid crystal display panel requires only one step of vapor-depositing electrodes on a glass substrate, but a liquid crystal display panel with the patterns shown in Figures 1 and 2 requires It is necessary to go through a complicated process of depositing an electrode once, then depositing an insulating material such as 5 in 2 using a mask to form the insulating film 3 or 8, and then depositing the electrode.

As described above, conventional multi-matrix liquid crystal display panels require many manufacturing steps, resulting in lower yields and higher manufacturing costs.

In order to eliminate such drawbacks of the conventional example, the present applicant has previously proposed a dual matrix liquid crystal display panel as shown in FIGS. 4 to 7.

(Japanese Patent Application No. 50-127448) FIG. 4 1 shows the electrode pattern formed on one of the two glass substrates, and each row of picture element electrodes 12 consists of two The connection lines 13 are connected in turn.

On the other glass substrate, the picture element electrodes 17 are connected in each row as shown in FIG. 4.

In this example, two unit matrices, a D matrix and a U matrix, are formed for one liquid crystal panel, resulting in a double matrix panel.

In FIG. 4 1, among the connection lines 13, DYn (n-1
, 2, 3, ...) are the Y electrodes of the D matrix, and U
Yn (n=1.2.3,・mountain・−) is Y of U matrix
DXn (nl, 2.3,
...) is the X electrode of the D matrix, UXn (n=
1.2.3,...) become the X electrodes of the U matrix.

FIG. 5 shows the appearance of a liquid crystal display panel actually made using the glass substrates shown in FIGS. 4 1 and 4 2.
The figure shows several circuits, and the reference numeral 20 indicates a display segment in which picture element electrodes sandwich a liquid crystal.

The symbols of the X electrode and Y electrode correspond to those in FIG. 4.

As shown in these figures, the electrode structure shown in FIG. 4 provides a liquid crystal display panel in which a unit matrix consisting of a group of display segments arranged every other row is doubled.

Next, FIG. 7 shows a drive circuit for a display device when this liquid crystal display panel is used.

The X electrode drive circuit 21 drives scan electrodes DX1, DX2 . UX
1, the drive circuit of UX2 generates a drive signal for line sequential scanning.

Further, the U matrix Y electrode drive circuit 22 is a drive circuit for applying a drive signal to the Y electrodes (signal electrodes) of the U matrix, and the IJ matrix Y electrode drive circuit 22 is a drive circuit for applying a drive signal to the Y electrodes (signal electrodes) of the D matrix. This is a drive circuit for applying a drive signal.

When displaying, a selection voltage (voltage for lighting) is applied to UXI and DX 1 from the X electrode drive circuit 21,
When a non-selection voltage (a voltage that does not cause lighting) is applied to UX2 and DX2, the U matrix Y electrode drive circuit 2
2, a signal corresponding to the display pattern of the display segment of the UXI line is sent to the D matrix Y electrode drive circuit 23.
From there, a signal corresponding to the display pattern of the DXI display segment is applied to the liquid crystal element.

At this time, a selection voltage is generated from the U matrix Y electrode drive circuit 22 and the D matrix Y electrode drive circuit 23 whose output terminals are connected to segments to be lit, and non-selected from those whose output terminals are connected to segments that are not to be lit. Generates voltage.

Voltage averaging method (1), which is a liquid crystal driving method that has already been developed
When driving the liquid crystal display panel of the present invention by the /3 bias method, the output voltage of the driving circuit is selected by a combination of an address signal and a clock signal.

A specific driving circuit is shown in FIG. 8a.

This is applied to both the X electrode drive circuit and the Y electrode drive circuit, and the output voltage Vout resulting from the combination of address signal A and clock signal C is as shown in FIG.

When address signal A is "1", Vout is a selection signal waveform, and when address signal A is O", Vout is a non-selection signal waveform.

A specific example of address signals and clock signals for driving the device of FIG. 7 is shown in FIG.

The phases of the X clock signal Cx and the Y clock signal CY are reversed.

On the other hand, the X address signal goes into the selected state in the order of AXl and AX2, and by line sequential scanning, TJXl, DXl, and U
Select X2 and DX2 simultaneously and scan sequentially.

In the example of FIG. 9, the address signal is AUYi t AUY2
The same signal is applied to ADYI t ADY2, and the same signal is applied to ADYI t ADY2. Since the electrodes can be selected and scanned at the same time, the number of scanning lines is apparently doubled, making it possible to increase the size of the liquid crystal panel.

However, the conventional example has a problem in that a matrix display panel with three or more layers cannot be formed without intersecting the electrodes.

An object of the present invention is to eliminate the above drawbacks and provide an n-fold (n-fold 3) matrix liquid crystal display panel without crossing electrodes.

The multilayer IJ liquid crystal display panel of the present invention that achieves the above object is characterized by having a plurality of electrodes facing each other on the opposing surfaces of a pair of substrates, holding the liquid crystal between the substrates, In cases where the display segments formed by the opposing portions of the electrodes and the liquid crystal located between them are in the form of a matrix as a whole, one substrate has n rows arranged in a matrix and adjacent to each other in each column. (n-fold 3
) are provided so that the picture element electrodes facing the display segments of the display segments are respectively connected to different n connection lines, and the first picture element electrodes facing the display segments of the first row of each column are connected to The connection line and the second connection line connected to the picture element electrode facing the nth row display segment of each column are as follows:
They are arranged in parallel on both sides of the picture element electrodes in each column, and the second row, .

The other connection lines connected to the picture element electrodes facing the first row are made by using the gaps between the first connection line, the second connection line, and the picture element electrodes of each column. The other substrate is provided with electrodes facing the n-row display segments so as to be electrically connected thereto.

Hereinafter, the present invention will be explained based on examples.

FIGS. 10 and 11 show patterns of a glass substrate constituting a triple matrix according to an embodiment of the present invention.

FIG. 10 shows an electrode pattern formed on one glass substrate, in which each column of picture element electrodes 24 arranged in a matrix has three connection lines as shown at 25, 26, and 27. The picture element electrodes 24 are connected alternately every two rows by three connection lines.

Here, the first connection line 25 is connected to the pixel electrode 24 facing the display segment in the first row of each column, and the third connection line 26 is connected to the display segment in the second row of each column. The second connection line 27 is connected to the picture element electrode 24 facing the display segment in the third row of each column.

The first connection line 25 and the second connection line 27 are arranged in parallel on both sides of the picture element electrodes 240 in each column.

Further, the third connection line 26 is provided using the gap between the first connection line 25, the second connection line 27, and the picture element electrodes 24 of each column.

With such a configuration, a triple matrix liquid crystal display panel can be formed without crossing the electrodes.

FIG. 11 shows an electrode pattern of the other glass substrate facing the one shown in FIG. 10, in which picture element electrodes 29 are connected in each row.

With such an electrode pattern, a triple unit matrix is formed from display segments every two rows.

That is, in FIG. 11, UXl and UX2 are the X electrodes of the U matrix, and MX? , MX2 is the X electrode of the M matrix,
DXl and DX2 become the X electrodes of the D matrix, and the 10th
Among the connection lines in the figure, the first connection lines UY1 to IJY4 are the Y electrodes of the U matrix, the third connection lines MY1 to MY4 are the Y electrodes of the M matrix, and the second connection lines DY1 to DY4 are the Y electrodes of the D matrix. becomes.

An effective driving method for this triple-matrix liquid crystal display panel is to scan each unit matrix independently and line-sequentially in parallel, similar to the double-matrix method described above.

According to such a driving method, as the number of unit matrices on the liquid crystal display panel of the present invention increases, a larger scale display can be obtained.

In the embodiment described above, the unit matrix (IJ) is configured in three layers, but in the present invention, the same unit matrix is configured in four layers, n layers, and even more multiple layers without intersecting the electrodes. Can be configured on a panel.

As described above, since the multiple matrix liquid crystal display panel of the present invention does not have electrodes crossing each other through an insulating layer, the manufacturing process is shortened compared to the conventional multiple matrix.
Yield is improved.

[Brief explanation of drawings]

1 to 3 are plan views and cross-sectional views showing electrode patterns of a conventional multi-matrix liquid crystal panel; FIGS. 4 and 5 are diagrams of electrode patterns of a conventional example previously proposed by the applicant; 6 is an equivalent circuit diagram of FIG. 5, FIGS. 7 and 8 are a conventional configuration diagram including a drive circuit, and an explanatory diagram of the drive circuit.
The figure is a waveform diagram of each part of FIG. 7, and FIGS. 10 and 11 are plan views showing electrode patterns of one embodiment of the present invention. 12.17,24,29・Song・Picture element electrode, 13°25.
26, 27... Connection line, 2o... Display segment.

Claims (1)

[Claims] A plurality of electrodes are provided to face each other on opposing surfaces of a pair of substrates, a liquid crystal is held between the substrates, and the liquid crystal is formed by the opposing portions of the electrodes and the liquid crystal located between them. When the display segments to be displayed are in the form of a matrix as a whole, one substrate has pixel electrodes arranged in a matrix and facing n rows (n≧3) of adjacent display segments in each column. A first connection line provided to be connected to each of n different connection lines and connected to a picture element electrode facing the display segment in the first row of each column; The second connection lines connected to the picture element electrodes for the eye display segments are arranged in parallel on both sides of the picture element electrodes in each column, and are connected to the second row of each column, . . . - The other connection lines connected to the picture element electrodes facing the i-th row utilize the gaps between the first connection line, the second connection line, and the picture element electrodes of each column. A multi-matrix liquid crystal display panel, characterized in that the other substrate is provided with electrodes facing the n-row display segments so as to be electrically connected thereto. 2. Claim 1 is characterized in that the picture element electrodes in each column are alternately connected every n-1 by n (n≧3) connection lines as defined above. Multi-matrix liquid crystal display panel.