JPH02101433A - Liquid crystal display panel - Google Patents

Abstract

PURPOSE:To make a display of resolution which is other than one segment of the maximum displaying resolution divided by an integer by impressing an electric field upon one of two liquid crystal layers, with no electric field being impressed upon the other layer, and switching the layer upon which the electric field is impressed between the two layers. CONSTITUTION:Two liquid crystal layers 13 and 15 facing each other at an interval are respectively put between signal electrode plates 12 and 16 on each of which signal electrodes are arranged in the direction perpendicular to the arranging direction of scanning electrodes and a scanning electrode plate 14 on which the scanning electrodes are arranged in parallel with each other in a plane. Then the numbers of the scanning electrodes on the plate 14 and signal electrodes on the plates 12 and 16 are made different against the two liquid crystal layers 13 and 15. In other words, the liquid crystal layers 13 and 15, scanning electrode plate 14, and signal electrode plates 12 and 16 are put between polarizing plates 11 and 17. When such constitution is used, displays of the maximum displaying resolution and resolution other than one segment of the maximum resolution divided by an integer can be performed.

Description

[Detailed description of the invention] <Industrial application field> This invention relates to liquid crystal display panels.

<Prior Art> Conventionally, there is a type of liquid crystal display (hereinafter referred to as LCD) panel as shown in FIG. 4 or FIG. 5.

FIG. 4 shows an example of the structure of a T N -L CD panel. This T N -L CD panel has one liquid crystal layer 43, a signal electrode plate 42 and a scanning electrode plate 44 arranged to define the liquid crystal layer 43, and a signal electrode plate 42 and a scanning electrode plate 44, respectively, on the outside of the signal electrode plate 42 and the scanning electrode plate 44. It is composed of arranged polarizing plates 41 and 45. The signal electrode plate 4
2 and the scanning electrode plate 45 are both transparent, and the signal electrode plate 42
There are signal electrodes on the liquid crystal layer side, and the scanning electrode plate 4
A scanning electrode is provided on each of the liquid crystal side surfaces of 4.

Now, the light incident on the polarizing plate 41 is transmitted only in a specific direction, and is incident on the liquid crystal layer 43 via the signal electrode plate 42. In the absence of an electric field, the liquid crystal molecules have a twisted structure that is twisted by 90 degrees parallel to the plate surface, but when an electric field is applied, the arrangement changes to perpendicular to the plate surface.

Therefore, in the part where there is no electric field, the polarized light reaches the polarizing plate 45 with a twist of 90 degrees, and in the part where the electric field is applied, the polarized light reaches the polarizing plate 45 with the original polarization. Here, for example, if the polarization direction of the temporary polarizer 45 is set in the same direction as that of the polarizing plate 41, the light passing through the non-electric field portion is blocked and becomes dark, and the light passing through the electric field portion is transmitted and appears bright. By controlling the electrodes 42, 44 in this manner, a black and white screen can be displayed.

Figure 5 shows DS, which is currently attracting attention for its high contrast.
An example of the structure of a T-LCD panel is shown. This DST-LCD panel has a sharper contrast by increasing the twist angle of liquid crystal molecules compared to a TN-LCD panel, but since the transmitted light is colored, the twist is different from that of the liquid crystal layer 53 to which an electric field is applied. Another liquid crystal layer 55 with the opposite orientation is added to perform color compensation. No electric field is applied to the liquid crystal layer 55 for color compensation.

Both the TN-LCD panel and the DST-LCD panel have a simple matrix electrode structure. In this simple matrix method, a matrix is formed using a signal electrode group in which a plurality of elongated signal electrodes are arranged in parallel, and a scanning electrode group in which a plurality of elongated scanning electrodes are arranged in parallel in a direction perpendicular to the arrangement direction of the signal electrodes. Each point in this matrix is the basic unit of display (dot). The display resolution is expressed by the total number of these dots in the horizontal and vertical directions.

The number of signal electrodes determines horizontal resolution, and the number of scanning electrodes determines vertical resolution. For example, there are 768 signal electrodes and 51 scanning electrodes.
If two are arranged, the maximum display resolution of that panel will be 768 x 512 dots. Here, if you print 2 dots of the same data, the display resolution will be 2 minutes, 3 dots.
If you hit a dot, it will drop to one-third. For example, if horizontal data is printed with two dots, the display resolution mentioned above is 384x.
It becomes 512 dots.

<Problems to be Solved by the Invention> As described above, since the display resolution of the conventional LCD panel described above is limited to the maximum display resolution and an integer fraction thereof, other resolutions, for example, the maximum display resolution 76
In the case of 8x512 dots, it was not possible to display at a resolution of 640x400 dots. Therefore, there was a problem in that it was not suitable as a display device for devices such as personal computers that require many display modes.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide an LCD panel capable of displaying at a resolution other than an integer fraction of the maximum display resolution.

Means for Solving the Problems> In order to achieve the above object, the LCD panel of the present invention has the following features:
Each liquid crystal layer of two liquid crystal layers arranged to face each other with a gap is connected to a scanning electrode plate having a plurality of elongated scanning electrodes arranged in parallel on one plane, and a scanning electrode plate arranged parallel to the scanning electrode plate. A plurality of elongated signal electrodes are arranged between signal electrode plates arranged in a direction perpendicular to the arrangement direction of the scanning electrodes, and the number of scanning electrodes of the scanning electrode plates sandwiching each liquid crystal layer and the signal of the signal electrode plates are determined. The present invention is characterized in that the number of electrodes is different for the two liquid crystal layers, and the liquid crystal layer, scanning electrode plate, and signal electrode plate are sandwiched between two polarizing plates.

Effect> In the above configuration, an electric field is applied to one of the two liquid crystal layers, and no electric field is applied to the other.

Then, the liquid crystal layer to which the electric field is applied will transmit light and
The liquid crystal layer to which the electric field is not applied performs color compensation. Therefore, by switching the liquid crystal layer to which an electric field is applied, the number of scanning electrodes and the number of signal electrodes for one liquid crystal layer differs from the number of scanning electrodes and number of signal electrodes for the other liquid crystal layer. It is possible to perform display at a resolution other than an integer fraction of the resolution.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

1.2.3 are structural diagrams of a first embodiment, a second embodiment, and a third embodiment of the present invention, respectively.

In FIG. 1, 11.17 is a polarizing plate, 12 and 16 are signal electrode plates, 13.15 is a liquid crystal layer, and 14 is a scanning electrode plate. The two polarizing plates II and 17 have the same polarization direction. In addition, the signal electrode plate 12 has 768 elongated electrodes arranged in parallel on the side (lower surface) facing the liquid crystal layer 13.
．． The signal electrode plate 16 has six electrodes on the side (upper surface) facing the liquid crystal layer 15.
Forty elongated electrodes are arranged in parallel in the same direction as the arrangement direction of the signal electrodes. The scanning electrode plate 14 is the liquid crystal layer 13
512 elongated electrodes on the side facing the liquid crystal layer 15 (bottom surface), 400 elongated electrodes on the side facing the liquid crystal layer 15 (lower surface),
They are arranged in parallel in a direction perpendicular to the arrangement direction of the signal electrodes. That is, the scanning electrodes and the signal electrodes are arranged in a matrix as described in the conventional example, and one point I where they intersect is the basic unit of display (dot).

In the above configuration, when displaying 768x512 dots, a signal voltage is applied to the electrodes of the signal electrode plate 12 and the electrodes on the upper surface of the scanning electrode plate 14, and the electrodes of the signal electrode plate 16 and the electrodes on the lower surface of the scanning electrode plate 14 No signal voltage is applied to.

Then, an electric field is applied to the display dot portions of the liquid crystal layer (3), and the polarized light from the polarizing plate 11 is transmitted as is, but no electric field is applied to the non-display dot portions, so that the polarized light is further deflected and passes through. Further, since no signal voltage is applied to the liquid crystal layer 15, the arrangement of liquid crystal molecules is twisted. Therefore, the polarized light at the display dot portion is reversely polarized, and the polarizing plate 1
Since the direction of deflection is different from that of 7, the light is blocked and it appears black.

The polarized light of the non-display dot portion is reversely polarized and returned to the same direction as the polarizing direction of the polarizing plate 17.
7 and appears bright. Moreover, since the transmitted light is color compensated, it can be seen as white light. In this way, paper white display with a maximum display resolution of 768 x 512 dots is performed.

Next, when displaying 640x400 dots, a signal voltage is applied to the electrodes of the signal electrode plate 16 and the electrodes on the lower surface of the scanning electrode plate 14, and the electrodes of the signal electrode plate 12 and the electrodes of the scanning electrode plate 1
No signal voltage is applied to the Ti pole on the top surface of 4. In this case, the entire surface molecular arrangement of the liquid crystal layer 13 remains twisted,
The polarized light from the polarizing plate 11 is further polarized and reaches the liquid crystal layer 15.

In the liquid crystal layer I5, the light from the display dot portion is transmitted with its polarization unchanged, so it is blocked by the polarizing plate t7 and appears black. Also, since the light in the non-display area is reversely polarized, it returns to its original polarization and is color-compensated and appears white. In this way,
An integer fraction of the above maximum display resolution of 763 x 512 dots
A paper white display with a resolution of 640x400 dots is performed.

The above operation is exactly the same if the positions of the signal electrode plate and the scanning electrode plate are reversed. For example, even if a scanning electrode plate is placed at 12 and 16 and a signal electrode plate is placed at 14, the operation will not change.

The second embodiment shown in FIG. 2 is composed of a polarizing plate 21.27, a signal electrode plate 22.26, a liquid crystal layer 23.25, and a scanning electrode plate 24. The scanning electrode plate 24 has 512 i-poles on only one side, and the signal electrode plates 22 and 26 have 768 and 512 electrodes, respectively. The other configurations are the same as in the first embodiment.

In the above configuration, when displaying 768×512 dots, a signal voltage is applied to the electrode of the signal electrode plate 22 and the electrode of the scanning electrode plate 24, and no signal voltage is applied to the electrode of the other signal electrode plate 26.

Further, when displaying 512×512 dots, a signal voltage is applied to the electrodes of the signal electrode plate 26 and the scanning Ii electrode plate 24, but no signal voltage is applied to the electrode of the signal electrode plate 22.

By doing so, a display with a maximum display resolution of 768x512 dots and a paper white display with a resolution of 512x512 dots, which is a resolution other than an integer fraction of the maximum display resolution of 768x512 dots, are performed.

The third embodiment shown in FIG. 3 includes polarizing plates 31.38, signal electrode plates 32.35, liquid crystal layers 33.36, and scanning electrode plates
4.37. The signal electrode plate 32.
35 has 768 and 640 electrodes on the bottom surface, respectively, and scanning electrode plate 34.37 has 512 and 4 electrodes on the top surface, respectively.
It has 00 electrodes. The other configurations are the same as in the first embodiment.

In the above configuration, when displaying 768 x 512 dots, a signal voltage is applied to the electrodes of the signal electrode plate 32 and the electrodes of the scanning electrode plate 34, and a signal voltage is applied to the electrodes of the signal electrode plate 35 and the electrodes of the scanning electrode plate 37. is not applied. Also, 64Q
When displaying x400 dots, a signal voltage is applied to the electrodes of the signal electrode plate 35 and the scanning electrode plate 37, and no signal voltage is applied to the electrodes of the signal electrode plate 32 and the scanning electrode plate 34. By doing this, the maximum display resolution is 768X
512 dot display and maximum display resolution 768x5
An integer of 12 dots! 640X4, which is a resolution other than
Paper white display with a resolution of 0.00 dots is performed.

<Effects of the Invention> As is clear from the above, the LCD panel of this invention has the following effects:
Each liquid crystal layer of two liquid crystal layers arranged to face each other with a gap is connected to a scanning electrode plate having a plurality of elongated scanning electrodes arranged in parallel on one plane, and a scanning electrode plate arranged parallel to the scanning electrode plate. A plurality of elongated signal electrodes are arranged between signal electrode plates arranged in a direction perpendicular to the arrangement direction of the scanning electrodes, and the number of scanning electrodes of the scanning electrode plates sandwiching each liquid crystal layer and the signal of the signal electrode plates are determined. The number of electrodes is made different for the two liquid crystal layers, and the liquid crystal layer, scanning electrode plate, and signal electrode plate are sandwiched between two polarizing plates, so that the maximum display resolution and the integer fraction of the maximum display resolution are It is possible to perform display at a resolution other than 1, and therefore it can be used as a display device for devices such as personal computers that require a large number of display modes.

[Brief explanation of the drawing]

1.2.3 are the first embodiment and the second embodiment of this invention, respectively.
The structural diagrams of the embodiment and the third embodiment, and FIGS. 4 and 5 are structural diagrams of the conventional example. + 1.17, 21, 27, 31.38... polarizing plate,
12.16, 22, 26, 32.35... Signal electrode plate, 13.15, 23, 25, 33.36... Liquid crystal layer, 1
4.24, 34.37...Scanning electrode plate.

Claims (1)

[Claims] (1) A scanning electrode plate in which a plurality of elongated scanning electrodes are arranged in parallel on one plane, and a scanning electrode plate for each of two liquid crystal layers arranged to face each other with a gap between them. A plurality of elongated signal electrodes are arranged in parallel with the signal electrode plates arranged in a direction perpendicular to the arrangement direction of the scanning electrodes, and the number of scanning electrodes and the signal electrodes of the scanning electrode plates sandwiching each liquid crystal layer are A liquid crystal display panel characterized in that the number of signal electrodes on the plate is different for the two liquid crystal layers, and the liquid crystal layer, scanning electrode plate, and signal electrode plate are sandwiched between two polarizing plates.