JPS63247728A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To minimize the uneven coloration and color change of background colors by forming a liquid crystal layer into two-layered structure consisting of a pattern layer as well as a pattern layer and background display layer and forming both layers in such a manner that the layers can be controlled in lighting to different colors. CONSTITUTION:Transparent electrodes 8a (red), 8b (green) corresponding to sigment display parts 13 are formed on an transparent substrate 4, and a filter 10a (red), 10b (green) are alternately superposed and disposed thereon so as to face a common electrode 9 on a transparent substrate 5. A liquid crystal 11 is packed between the substrates. Electrodes and filter laminates for displaying red and green colors are similarly alternately disposed on a substrate 6 so as to correspond to a background display part 14 and to face the common electrode of the substrate 5. A liquid crystal 12 is then packed between the substrates. Polarizing plates 2, 3 are disposed on the outside of the substrates 4 and 6. The liquid crystals 11, 12 are of a twisted nematic type having positive dielectric anisotropy. The relative positions of polarizing axes thereof and the relative positions of the polarizing axes of the polarizing plates 2, 3 are selected as specified. The displaying having a wide variety and ample colors is permitted and the uneven coloration of the background, etc., are eliminated if the electrodes of the display parts and background parts are selectively discriminated and controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display element, and particularly to a color liquid crystal display element suitable for color display.

[Conventional technology]

The conventional color liquid crystal display element is disclosed in Japanese Patent Application Laid-Open No. 61-10738.
As stated in Publication No. 0, the display of the same part is
When displaying in more than one color, the liquid crystal cell has a two-layer structure to prevent non-colored parts from occurring in the display area, and the transparent electrodes and color filters are made of the first layer and the second layer. The layers did not overlap each other, but were interwoven alternately.

[Problem that the invention seeks to solve]

The above-mentioned conventional color display technology concerns the segment part that performs one display, and does not consider the background color, making it impossible to select the background color. There were problems such as background color changes depending on the ambient temperature in two viewing angle directions.

Therefore, an object of the present invention is to enable selection of a background color and to minimize color unevenness, color change, etc. of the background color.

[Means for solving problems]

In order to achieve this object, the present invention is characterized in that the liquid crystal layer has a two-layer structure of a pattern display layer and a background display layer, and both layers can be controlled to light up in different colors.

[Effect]

The entire display area is turned on, and the background area, which was a non-lighted area in the past, is also turned on, so it is possible to eliminate color unevenness, color change, etc. of the background color. Furthermore, the background color can be set by selecting a color filter provided in the liquid crystal layer.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view showing an example of a liquid crystal display element according to the present invention, which displays numbers using seven segments. In the figure, 13 is a numerical display section with segments,
Reference numeral 14 indicates a dark black portion in the conventional TN transmission type negative display, but in this embodiment, this portion is also a background display portion that participates in the lighting display. Note that this background display section 14 is
It extends over the entire effective display area of the liquid crystal display element 1.

Here, we will take as an example a TN color liquid crystal display element in which fine color filters are formed in a liquid crystal layer corresponding to transparent electrodes. A configuration that enables three-color display,
The operation will be explained using an example.

FIG. 1 shows a cross-sectional view of the liquid crystal display element 1 shown in FIG. 2. As shown in FIG. That is, on the first transparent substrate 4, two sets of fine transparent electrodes 8a (for example, for red display) and sb (for example, for green display) in a comb-like pattern corresponding to the segment display section 13 are disposed. Furthermore, a color filter 10a is formed corresponding to the two sets of fine transparent electrodes 8a and 8b.
(for example, red) and 10b (for example, green) are formed alternately. Here, a common electrode 9 for the segment display portion 13 corresponding to the transparent electrodes 8a and 8b is formed on the first transparent substrate 4 side of the second transparent substrate 5 facing each other. Note that a liquid crystal substance 11 is filled between the first transparent substrate 4 and the second transparent substrate 5.

Further, on the third transparent substrate 6, corresponding to the background display section 14, that is, over the entire effective display area excluding the segment display section 13, a comb-like shape completely similar to the transparent electrodes 8a and 8b is formed. Two sets of transparent electrodes 8a' with fine patterns
(for red display) and 8b' (for green display) are formed, and color filters 10a' (red) and 10b' (for green display) are formed.
b' (green) are formed alternately. A common electrode a' for the background display section 14 is also formed on the third transparent substrate 6 side of the second transparent substrate 5 opposite thereto, corresponding to the transparent electrodes 8a' and 8b'. There is.

Note that between the second transparent substrate 5 and the third transparent substrate 6,
A liquid crystal material 12 is filled.

Further, an upper polarizing plate 2 is disposed on the outside of the first transparent substrate 4, and a lower polarizing plate 3 is disposed on the outside of the third transparent substrate 6.

Next, the operation will be explained with reference to FIG. FIG. 3 shows the same parts as FIG. 2, but the transparent electrodes and color filters are omitted. Here, the polarizing axis of the upper polarizing plate 2 is horizontal to the plane of the paper, the polarizing axis of the lower polarizing plate 3 is vertical to the plane of the paper, and the liquid crystal material 11 is placed on the first transparent substrate 4. In this case, the polarization axis is parallel to the plane of the paper, and the second transparent substrate 5
In the above example, a twisted nematic liquid crystal with positive dielectric anisotropy whose polarization axis is perpendicular to the plane of the paper is used. On the third transparent substrate 6, twisted nematic liquid crystal having positive dielectric anisotropy is controlled so that its polarization axis is perpendicular to the plane of the paper.

With the above configuration, if both the segment display section 13 and the background display section 14 are turned on as an electric field, the display can be obtained. Therefore, this on/off (On.

off) to the red display electrode 8a of the segment display section 13.
By separately controlling the green display electrode 8b, the red display electrode 8a', and the green display electrode 8b' in the background display section 14, a display as shown in FIG. 4 can be achieved. For example, switching between negative display and positive display,
Alternatively, a variety of displays can be used, such as displaying red or yellow on a green area.

In addition, in FIG. 1, as long as the segment display liquid crystal layer and the background color display liquid crystal layer are distinguished between the first liquid crystal layer and the second liquid crystal layer, electrode formation and color filter formation can be easily performed. 1st. Second. It is arbitrary which part of the third transparent substrates 4 to 6 is applied.

〔Effect of the invention〕

According to the present invention, one-color lighting display can be performed even in an area that is a background area other than the display pattern area, so that the background color unevenness and two-color change in the non-lighting state that occur in conventional liquid crystal display elements can be avoided. This problem is solved, and it is possible to display a variety of colorful displays.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional side view of a liquid crystal display element according to the present invention, and FIG.
The figure is a plan view thereof, and FIG. 3 is a schematic diagram illustrating the operation of the present invention.
FIG. 4 is an explanatory diagram showing the operational functions of the present invention. 2... Upper polarizing plate, 3... Lower polarizing plate, 4,5.6
...First. Second. Third transparent substrate, 8a, 8a'...
- Transparent electrodes for red display, 8b, 8b'...Transparent electrode for green display, 9.9'...Common electrode, 10a. 10a'-red color filter, 10b, 10b'
...Green color filter, 11.12...Liquid crystal substance, Figure 1

Claims (1)

[Claims] 1. first, second, and third transparent substrates arranged oppositely;
, first and second liquid crystals sealed between the second substrate and between the second and third substrates, respectively, and first and second polarizing plates arranged outside the first and third transparent substrates. , transparent electrodes installed on the liquid crystal side of the first transparent substrate, on both sides of the second transparent substrate, and on the liquid crystal side of the third transparent substrate, and at least one of the first, second, and third transparent substrates. and a color filter formed on a transparent substrate, and a second transparent substrate is provided with a color filter formed on a transparent substrate. A liquid crystal display element characterized in that a display pattern formed by transparent electrodes disposed on a third transparent substrate side of a substrate and a liquid crystal side of the third transparent substrate has a different color. 2. In claim 1, at least one of a transparent electrode pattern on the liquid crystal side of the first transparent substrate and a transparent electrode pattern installed on the first transparent substrate side of the second transparent substrate. , and at least one of the transparent electrode pattern on the third transparent substrate side of the second transparent substrate and the transparent electrode pattern installed on the liquid crystal side of the third transparent substrate has a comb-shaped electrode structure. A liquid crystal display element characterized by: