JPS63101828A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To enable display varied at high speed and to permit display of optionally varied pattern by constructing a liquid crystal display device constituted of a dot-matrix display type TN type liquid crystal cell and a segment display type TN type liquid crystal cell superposed on each other and interposed between a polarizer and an analyzer. CONSTITUTION:A liquid crystal display device 1 has a multilayered structure constituted of a TN type liquid crystal cell 2 and a TN type liquid crystal cell 3 interposed between a polarizer 4 and an analyzer 5. The TN type liquid crystal cell 2 comprises TN type liquid crystal 6, transparent electrodes 7, 8 and glass plates 9.10. Another TN type liquid crystal cell 3 comprises a TN type liquid crystal 11, transparent electrodes 12, 13, and glass plates 10, 14. The cell 2 is of a segment display type in which the electrodes 7, 8 are constructed in a form of segments having a specified pattern. On the other hand, the cell 3 is of a dot-matrix type comprising electrodes 12, 13 forming dot-matrix. By this constitution, tachometer display which is required to be varied at high speed and message display which is required to display free characters are both performed satisfactorily in the one screen.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid crystal display, and more particularly to a liquid crystal display useful as a panel meter for an automobile.

BACKGROUND ART Conventionally, liquid crystal display devices using a dot matrix display method and liquid crystal display devices using a segment display method have been known.

The dot matrix display type liquid crystal display generates a pattern of nine character shapes by combining dots, so it has a large degree of freedom and has the advantage of being able to form any character and shape.

However, since a large number of dots are required, there is a problem that the configuration including the drive circuit is complicated.

Another problem is that it takes time to rewrite the display. Furthermore, since there is a limit to the size of one dot, there is a problem that detailed or smooth display cannot be performed.

On the other hand, the segment display type liquid crystal display has 1 character in advance.
In order to form segments with a geometric pattern,
This has the advantage that the number of segments is relatively small and the configuration including the drive circuit is simple. It also has the advantage of fast rewriting speed (and the ability to display detailed or smooth images).

However, characters other than the preformed pattern.

There is a problem with not being able to display figures.

Incidentally, in many cases, a segment display type liquid crystal display is used as a panel meter for an automobile.

This is because the patterns of various meters are fixed, the display of certain types of meters such as tachometers requires high speed rewriting, and the overall configuration can be simplified.

However, with the advent of information technology in recent years, there has been an increasing demand for automobiles to display a large amount of information, and segment display systems are no longer able to meet this demand. being developed.

However, since the interior of a car is a limited space,
There is a problem in that increasing the number of equipment sacrifices livability, etc., and some kind of improvement is desired.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a liquid crystal display device that can freely display three characters and shapes on one display screen, and display fine or smooth images with fast rewriting speed. It's about doing.

Structure of the Invention The liquid crystal display device of the present invention has a dot matrix display type T.
The structural feature is that an N-type liquid crystal cell and a TN-type liquid crystal cell of a segment display type are stacked and sandwiched between a polarizer and an analyzer.

EXAMPLES Hereinafter, the present invention will be explained in more detail based on examples shown in the drawings. Here, FIG. 1 is a schematic cross-sectional view of a liquid crystal display according to an embodiment of the present invention, FIG. 2 is a diagram explaining the principle of the liquid crystal display shown in FIG. 1, and FIG. 3 is a TN type liquid crystal display with a segment display method. 4 is a dot distribution diagram of a TN-type liquid crystal cell with a dot matrix display method; FIG. 5 is an illustration of a display in a TN-type liquid crystal cell with a segment display method; FIG.
The figure shows an example of the display of a TN-type liquid crystal cell with a dot matrix display method, FIG. 7 shows an example of the display obtained with a liquid crystal display, and FIG. 8 shows another example of the display of a TN-type liquid crystal cell with a segment display method. FIG. 9 is an illustrative diagram of another example of the display of a TN type liquid crystal cell using a dot matrix display system, and FIG. 10 is an illustrative diagram of another example of the display obtained by a liquid crystal display. Note that the present invention is not limited to the embodiments shown in the figures.

The liquid crystal display l shown in FIG.
It has a multilayer structure in which a type liquid crystal cell 3 is sandwiched between a polarizer 4 and an analyzer 50.

The TN type liquid crystal cell 2 includes a TN type liquid crystal 6 and a transparent electrode 7.8.
and a glass plate 9.10.

The other TN type liquid crystal cell 3 consists of a TN type liquid crystal 11, transparent electrodes 12.13, and a glass plate 1O214.

The glass plate lO is common to both TN type liquid crystal cells 2.3.

What should be noted here is that the TN type liquid crystal cell 2 is a segment display type, and the transparent electrodes 7.8 are formed in segments of a predetermined pattern, whereas the TN type liquid crystal cell 3 is a dot matrix display type. , its transparent electrode 12.1
3 is that it is formed in a dot matrix.

FIG. 2 shows the principle of light transmission and blocking by a structure in which TN type liquid crystal cells 2.3 are stacked.

First, as shown in Ta+, when both the TN type liquid crystal cells 2 and 3 are turned off (the polarization plane of the light is rotated by 90 degrees), the polarized light extracted by the polarizer 4 is transferred to the TN type liquid crystal cell. 2, it is rotated 90 degrees, and TN type liquid crystal cell 3 is rotated 90 degrees.
Since it is rotated by 0 degrees, the polarized light is ultimately polarized in the same plane as the polarized light taken out by polarizer 4, but the analyzer 5 is
Since the light is placed at a certain angle, it cannot pass through and the light is blocked.

Next, as shown in Figure 2, when the TN type liquid crystal cell 2 is turned off and the TN type liquid crystal cell 3 is turned on (a state in which the polarization plane of light is transmitted as it is without rotating), the polarizer 4 Since the emitted polarized light is simply rotated by 90 degrees in the TN type liquid crystal cell 2, it can be transmitted through the analyzer 5, and is in a transmitting state.

Similarly, when the TN type liquid crystal cell 2 is turned on and the TN type liquid crystal cell 3 is turned off as shown in (C1), the transmissive state is also achieved.

However, as shown in +dl, when both the TN type liquid crystal cells 23 are turned on, the polarized light taken out by the polarizer 4 is transmitted as it is to the analyzer 5, so this cannot be transmitted and the polarized light is cut off. .

Now, Figure 3 shows a segment display type TN type liquid crystal cell 2.
This shows the segment pattern of

i.e. rTAcHOMETERJ, rsPEEDM
ETERJ, rWARNINGJ, rkm/h
”, etc., but these can be displayed more finely and smoothly than by dot matrix, so TN type liquid crystal cell 2 with segment display method is used.
It is set in.

In addition, each segment 20 displays the tachometer graph.
This is provided in the TN type liquid crystal cell 2, but since the tachometer display changes at high speed, it is provided in the TN type liquid crystal cell 2 of the segment display method.

Further, the display frames 21 and 22 of the fuel gauge and water temperature gauge do not change and can be displayed in detail, so they are provided in the TN type liquid crystal cell 2 of the segment display type.

On the other hand, as shown in FIG. 4, in the TN type liquid crystal cell 3 of the dot matrix display type, a dot matrix pattern is formed almost over the entire surface.

Next, to show an example of a display, as shown in FIG.
and the bar graph segments of memory 6 and above of the tachometer are turned off, and the others are turned on. In addition, as shown in FIG. 6, a TN type liquid crystal cell 3 of a dot matrix display type
Now, the dots corresponding to the character pattern "102" and the bar graphs of the fuel needle and water temperature needle are turned on.

The bar graph portions of the fuel gauge and water temperature gauge are displayed using the dot matrix display type TN type liquid crystal cell 3 because these displays do not change at high speed.

Then, as the liquid crystal display 1, the TN type liquid crystal cell 2.
Since the ON/OFF exclusive OR part of No. 3 is displayed by the transmission of light, the tachometer, speedometer, fuel gauge, and water temperature gauge are displayed, respectively, as shown in FIG.

Note that the portion that is drawn at the top of the drawing is actually the portion that appears bright.

Next, other examples of display by this liquid crystal display 1 are shown in FIGS. 8 to 10.

In the segment display type TN type liquid crystal cell 2, only the rWARN I NGJ part and the water temperature gauge part are turned on, as shown in FIG.

Further, as shown in FIG. 9, in the TN type liquid crystal cell 3 of the dot matrix display type, rWATERJ.

Turn on the text "TEMP" and the bar graph of the water temperature gauge, and turn on the rWAR? of the segment display type TN type liquid crystal cell 2. The part that overlaps with the "lNG" part (
The hatched portion in FIG. 9) is inverted between the on state and the off state every second. Then, as shown in FIG. 10, the display on the liquid crystal display 1 is rWARNIG.
The part J reverses brightness and darkness every second, and is large rW
ATERTEMPJ, ie water temperature abnormality, is notified and a water temperature gauge is displayed.

In this way, according to this liquid crystal display 1, the tachometer display, which needs to change at high speed, and the message display, which needs to display free text, can be displayed on one screen.
Together they can do good.

Note that the glass plate 10 between the TN type liquid crystal cells 2.3
By selecting the thickness appropriately, it is possible to give a sense of depth to the display on the liquid crystal display 1, making it easier to see.

As another example, map patterns of areas where traffic congestion often occurs are displayed on a TN-type liquid crystal cell using a segment display method, and the optimal thread route according to the traffic congestion situation at that time is displayed on a TN-type liquid crystal cell using a dot matrix display method. One example is one that uses a liquid crystal cell for display. In this case, in addition to the closest thread path, the current position of the vehicle can also be displayed moment by moment using a dot matrix display type TN type liquid crystal cell.

Effects of the Invention According to the present invention, there is provided a liquid crystal display in which a dot matrix display type TN type liquid crystal cell and a segment display type TN type liquid crystal cell are stacked and sandwiched between a polarizer and an analyzer. This makes it possible to display both a rapidly changing display and an arbitrarily changing pattern display on one screen.

Therefore, when the iJ is used as a panel meter in an automobile, it is very convenient because it can display, for example, a tachometer display that changes at high speed and a message displaying driving information on one screen.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a liquid crystal display according to an embodiment of the present invention, FIG. 2 is a diagram explaining the principle of the liquid crystal display shown in FIG. 1, and FIG.
The figure shows a segment diagram of a TN type liquid crystal cell with a segment display method, Figure 4 is a dot distribution diagram of a TN type liquid crystal cell with a dot matrix display method, and Figure 5 shows a TN type liquid crystal cell with a segment display method.
FIG. 6 is a diagram illustrating a display in a TN type liquid crystal cell using a dot matrix display method.
The figure shows an example of the display obtained by a liquid crystal display, FIG. 8 shows another example of the display of a TN-type liquid crystal cell with a segment display method, and FIG. 9 shows an example of the display of a TN-type liquid crystal cell with a dot matrix display method. FIG. 10 is a diagram illustrating another example of a display obtained by a liquid crystal display. (Explanation of symbols) 1...Liquid crystal display 2...TN type liquid crystal cell with segment display method 3...
TN type liquid crystal cell with dot matrix display method 4...Polarizer 5...Analyzer.

Claims (1)

[Claims] 1. A liquid crystal display consisting of a dot matrix display type TN type liquid crystal cell and a segment display type TN type liquid crystal cell stacked on top of each other and sandwiched between a polarizer and an analyzer.