JPS61239220A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To improve the contrast to improve the visual recognizability by forming one transparent electrode in stripes and arranging red, green, and blue color filters alternately on this transparent electrode and forming the other transparent electrode into shapes of lit characters. CONSTITUTION:A transparent electrode 11 formed in stripes is arranged on a lower glass substrate 10, and red, green, and blue filters 12R, 12G, and 12B are attached alternately onto this electrode 11. A transparent electrode 14 is formed for pattern display of 7 segments or the like for numbers. Orientation control films 15 are arranged on electrodes 11 and 14, and liquid crystal materials 16 are sealed between them. Polarizing plates 17 and 18 are stuck to outsides of transparent glass substrates 10 and 13. Non-lit segment parts has the same color scheme as the display area other than segment parts. Thus, the contrast is improved to improve the visual recognizability.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a liquid crystal display device, and in particular to a variable color form shadow liquid crystal suitable for performing multicolor display using the three primary colors of red, green, and blue. Related to display elements.

[Background of the invention]

As a liquid crystal color display device, for example, JP-A-59-10
As shown in Japanese Patent No. 988, a dot-type color display is known.

In this method, a thin film transistor is formed as a semiconductor drive element on a liquid crystal substrate, and three primary color RGB color filters are formed on the thin film transistor to perform color display. This provision,
The manufacturing process is complicated and the manufacturing equipment is required to be equivalent to that of a semiconductor, resulting in a high-cost display element.

[Purpose of the invention]

An object of the present invention is to provide a color liquid crystal display element whose colors can be varied by forming transparent electrodes of the liquid crystal display element and corresponding color filters in the liquid crystal display element.

-C., Summary of the Invention] Transparent electrodes formed on a glass substrate are colored with red, green, blue, R, and GB colors, and multicolor display is performed by controlling the combination of colors.

In the present invention, the transparent electrodes and RGB color filters are formed in stripes to improve the visibility and contrast of a liquid crystal display element that performs color display by forming striped color filters in areas other than the lighting segment portions. This is how it was done.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing an example of the display contents of the liquid crystal display element 1, such as a digital display of a car's speedometer. The number 8 is made up of seven segments, a, b, c, d, and e, respectively.

Name it 19g segment.

FIG. 2 shows a cross-sectional structure of the liquid crystal display element 1. As shown in FIG. A transparent electrode 11 is disposed on the lower glass substrate 10, and red, green, and blue color filters 12 are disposed on the transparent electrode 11.
is printed.

On the other hand, a transparent electrode 14 is disposed on the upper glass substrate 13 facing the lower glass substrate 10 . It is assumed that the transparent electrode 14 has the shape of a t7 segment as shown in FIG. Furthermore, alignment control films 15 for orienting liquid crystal molecules in a certain direction are disposed on the transparent electrodes of the upper and lower plates, respectively, and a liquid crystal material 16 is sealed between them. Further, a lower polarizing plate 17 is pasted on the outside of the lower glass substrate 1o, and a lower polarizing plate 17 is attached to the outer side of the lower glass substrate 1o.
An upper polarizing plate 18 is also pasted on the outside of 3.

When a rectangular wave voltage is applied to each of the transparent electrodes 11 and 14, the liquid crystal 16 at the intersection of the upper transparent electrode 14 and the lower transparent electrode 11 operates, and the color filters 12 are printed in red, green, and red. Each color of blue can be seen through. Here, depending on how the transparent electrode 11 formed on the lower glass substrate 10 is selected, it is possible to display a single color or an intermediate color, thereby realizing a multicolor liquid crystal display.

In the present invention, when performing multicolor display by forming red, green, and blue color filters on transparent electrodes, the contrast of the lit character shape shown in FIG. 1 is improved by:
In order to increase the contrast difference between the lit segment portion and the non-lit segment portion, dummy color filters were also arranged in stripes in areas outside the 188 lit character images shown in FIG. This dummy color filter is commonly connected to the transparent electrode 11 and is always in a non-lighting state without any rectangular wave voltage being applied thereto. Therefore, the seven segments a, b, c, d, and e shown in FIG.

When displaying a character shape in which either f or g is not lit, the brightness is the same as that of the dummy color filter Eliat,
Since the images appear to have a similar color scheme, display with high contrast and excellent visibility can be performed.

To Figure 3, RlG, B of the t color filter shown in Figure 2.
The figure shows how they are arranged alternately in a stripe pattern. here,
The areas indicated by range A are R and G.

B are connected on the control circuit side.

On the other hand, the R, G, and B filters in the area indicated by range B are not connected to the control circuit side, and are so-called dummy filters. 7 shown in Figure 3? : When the state of the ranges A and B is represented in FIG. 2, they correspond to the locations of A and B in FIG.

Furthermore, the patterns indicated by dotted lines in FIG. 3 indicate seven segments, a and b.

c, d, e, f, and g are connected to the control circuit section side.

This is color filter A part and segment parts a, b,
When a rectangular wave voltage is applied to each terminal c, d, e, and f, the liquid crystal 16 at the t portion where the upper transparent electrode 14 and the lower transparent electrode 11 intersect with each other operates, and the red, green, and blue colors are activated. Each color appears to be transparent.

On the other hand, the color filter A part and the segment part a;, b
, c, d, e, f, and g where the electrodes do not intersect, the liquid crystal 16 does not operate and is in a non-lighting state.

FIG. 4 shows a and b corresponding to the upper transparent electrode 14.

This figure shows a state in which the character "7" is lit by applying a rectangular wave voltage to each segment of C. Other d,
Since no rectangular wave voltage is applied to each segment e, f, and H, the segment is in a non-lighting state. The segments d, e, f, and H that are in the non-lighting state are d, e,
Since it is observed that the color scheme is the same as the areas other than f and g, a.

The color scheme is completely different from that of the lighting segment portions b and c, resulting in a t display, and a display with good visibility can be obtained.

That is, since the color scheme of the non-lighted segment portions is exactly the same as the color scheme of the display area other than the segment portions, the shape of the non-lighted segments is not visible, and a display with excellent visibility can be provided.

Now, in FIGS. 3 and 4, only the numeral '8# is drawn for the sake of explanation, but it is assumed that similar color filters are disposed throughout the liquid crystal display element 1 shown in FIG. 1. .

〔Effect of the invention〕

According to the present invention, in a liquid crystal display element that performs multicolor display by forming striped electrodes and corresponding red, green, and real color filters on the electrodes, contrast is improved and visibility is improved. , it is possible to provide a multi-color liquid crystal display element that is aesthetically pleasing and has a t-effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a display example of a liquid crystal display element, FIG. 2 is a cross-sectional structural diagram of the liquid crystal display element, and FIG. 3 is a lighting example. A diagram showing how pattern segments and RGB color filters are arranged in a striped pattern, Figure 4 is a, b,
Applying a square wave voltage to the c segment Yj calculation 3 figure

Claims (1)

[Claims] 1. A liquid crystal characterized in that at least one transparent electrode is formed in the shape of a stripe, red, green, and blue color filters are alternately arranged on the electrode, and the other transparent electrode is formed in the shape of lit characters. display element.