JPS6283721A - Color liquid crystal display element - Google Patents

Abstract

PURPOSE:To improve the contrast and to improve the visibility by forming the fine comb line electrode for respective segments to execute the 7-segment figure display and forming the color filter equally over the whole surface of the display area. CONSTITUTION:An upper plate transparent electrode 12 specifies the shape of the display pattern of the 7-segment, and concerning segments (b) and (f) where the stripe direction and the lengthwise direction of the segment are coincident and segments (c) and (e), respective segments themselves are connected in the 7-segment. When the lower plate glass substrate and the upper plate glass substrate are overlapped, the part which is the interval of the pulling-out pattern of a lower plate transparent electrode 13, is passed through and connected to one outside an effective display area 20. Regardless of the presence and the absence of the lower plate transparent electrode 13, two-color (red and green) stripe-shaped color filters are alternately formed in the longitudinal direction which is the same direction as the comb line electrode pattern, uniformly over the whole surface of the effective display area. Thus, the contrast can be improved and the element excellent in the visibility can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a liquid crystal display device, and more particularly to a color liquid crystal display device suitable for displaying 7-segment numbers.

[Background of the invention]

In a color liquid crystal display element in which a color filter is formed on the electrodes of the liquid crystal display element, there is one in which each electrode is formed in a comb-like shape within a unit pixel for displaying an image.
Although it is known from Japanese Patent No. 9-222877, it is not known regarding the technique of displaying 7-segment numbers.

[Purpose of the invention]

An object of the present invention is to provide a color display element that has excellent visibility due to improved contrast.

[Summary of the invention]

The present invention relates to a color liquid crystal display element in which a color filter is formed on the surface of a comb-shaped electrode, in which a fine comb-shaped electrode is formed for each segment for displaying 7-segment numbers, and the display area is uniformly distributed over the entire display area. By forming a color filter, contrast is improved and a color liquid crystal display element with good visibility is provided.

[Embodiments of the invention]

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

FIG. 2 is a diagram showing an example of the display contents of a speedometer using a liquid crystal display element. The numerical part is composed of seven segments, and each segment is a,
By Cy d, et ft g segment.

FIG. 3 is a schematic diagram showing the cross-sectional structure of the liquid crystal display element 1. As shown in FIG. A transparent electrode 13 is disposed on the lower glass substrate 11, and on the transparent electrode 13, for example, red and green color filters 14R and 14G are alternately formed.

On the other hand, a transparent electrode 12 is disposed on the upper glass substrate 10 facing the lower glass substrate 11 . The transparent electrode 12 has a seven-segment shape as shown in FIG. Further, alignment control films 15'' are formed on the color filters 14R and 14G and on the transparent electrode 12, respectively, for aligning liquid crystal molecules in a certain direction, and a liquid crystal material 18 is sealed between them. A lower polarizing plate 17 is attached to the outer side of the lower glass substrate 11, and an upper polarizing plate 16 is attached to the outer side of the upper glass substrate 10 using an adhesive.

When a rectangular wave voltage is applied to each of the transparent electrodes 12 and 13, the liquid crystal 18 at the intersection of the upper transparent electrode 12 and the lower transparent electrode 13 operates, and each color of the color filter 14 is visible. . Here, lower plate transparent electrode 1
By selecting the voltage application to 3, it is possible to display a single color or three intermediate colors.

Moreover, in order to obtain high contrast and improve visibility, the electrode pattern configuration was adopted as shown in FIG. Furthermore, the first
The pattern indicated by a solid line in the figure indicates the lower plate transparent electrode 13 shown in FIG. 3, and similarly the pattern indicated by a broken line in FIG. 1 indicates the upper plate transparent electrode 12.

Now, the lower plate transparent electrode 13 has comb-shaped electrodes that are unified in the vertical direction with respect to the display segments, so that a, b, cl
The segments d, f3Hft, and g are configured. FIG. 4 shows a partially enlarged view of the g segment. Note that the comb-shaped electrodes for each color are arranged such that the comb-shaped electrodes corresponding to the same color in each segment are aligned in a straight line with respect to the stripe direction for convenience when forming the color filter. In other words, now we have a comb-shaped electrode corresponding to R of segment a, and b
.

The comb-like electrodes corresponding to R of the QHda et ft g segment are arranged on the same straight line in the vertical direction.

The upper plate transparent electrode 12 shown by broken lines in FIG.
Regarding the segments, and the C and e segments, the respective segments are connected within seven segments.

Regarding other segments that can be formed larger than one display segment, that is, awd+g segments, one of the ends in the longitudinal direction of each segment is used as an extension part to connect the electrodes. Note that this drawer pattern is as follows for each segment within the effective display area 20 (within the dashed line in FIG. 1) as a liquid crystal display element.
Furthermore, when the lower glass substrate and the upper glass substrate are stacked, they are connected to each other outside the effective display area 20 through a portion of the lower transparent electrode 13 that corresponds to the gap between the extraction patterns.

By connecting as above, within the effective display area,
In addition to the lighting shape, lighting can be prevented by the intersection of the lead-out patterns of the upper and lower transparent electrodes, and the number of wiring can be reduced and simplified.

Further, one display section can be driven completely statically, and display with good visibility without viewing angle dependence can be performed.

FIG. 5 is a diagram showing a case where the color filter 14 is formed in the electrode pattern shown in FIG. 1.

Regardless of the presence or absence of the lower plate transparent electrode 13, striped color filters of two colors red and green are formed alternately in the vertical direction, which is the same direction as the comb-shaped electrode pattern, uniformly over the entire effective display area. .

According to this embodiment, the entire effective display area is uniform, and the color scheme of the non-lit segment portion and the color scheme outside the display portion are completely the same, making it possible to provide a display with excellent visibility.

FIG. 6 is a diagram showing another embodiment, in which the stripe direction of the comb-like electrodes is oriented horizontally with respect to the display segment. In this case, all of the lower plate transparent electrodes 13 are oriented horizontally, and the terminal portions are formed as shown in FIG.
The terminal shape of the segment is as d as shown in Figure 6.
*Applicable to g-segments, each segment has a formed end in the lateral direction. Also, a and d in FIG.

That of g segment is s b g Q te e g
Applies to segments and is formed around one side of each segment. In the upper plate transparent electrode 12, segments b and f and segments c and e were connected in FIG.
This time, three apgtd segments are connected, and the extraction portion of the tQretf segment is provided at either end in the vertical direction for one display segment. FIG. 7 shows a case where a color filter is formed on the electrode pattern shown in FIG. 6, similar to FIG. 5.
Striped color filters of two colors are uniformly formed alternately in the lateral direction with respect to the display segment.

〔Effect of the invention〕

According to the present invention, in a color liquid crystal display element formed with comb-shaped electrodes and a color filter corresponding thereto, complete static driving is possible, the occurrence of lighting of electrode patterns other than the lighting part is eliminated, and the contrast By improving this, it is possible to provide a color liquid crystal display element with excellent visibility.

[Brief explanation of drawings]

The drawings show one embodiment of the color liquid crystal display device of the present invention, and FIG. 1 is a plan view of the display board showing the relationship between upper and lower electrode patterns. Fig. 2 is a diagram showing a display example of a liquid crystal display element, Fig. 3 is an enlarged cross-sectional view of a main part of a liquid crystal display element, and Fig. 4 is a diagram showing a display example of a liquid crystal display element.
The figure is an enlarged view of the main part of FIG. 1, FIG. 5 is a plan view showing a state in which a color filter is formed in FIG. 1 of the present invention, and FIG. 6 is an electrode according to another embodiment of the present invention. A wiring diagram showing the pattern, and FIG. 7 is a plan view showing a state in which color filters are formed in FIG. 6. 12...Transparent electrode, 13...Transparent electrode, 14...
color filter.

Claims (1)

[Claims] 1. A voltage is applied between a transparent electrode, which is placed on one of a pair of parallel transparent substrates through a color filter and forms seven segments, and the other electrode, and the liquid crystal In a color liquid crystal display element that displays a display segment by controlling the amount of transmission of the transparent electrode, each of the transparent electrodes constituting the display segment is composed of a pair of comb-shaped electrodes that are each independently controlled, and the comb-shaped electrode A color liquid crystal display element, characterized in that the stripes are arranged in the same direction for all of the segments. 2. In claim 1, the electrode on the side opposite to the display segment is formed in a shape that defines the display pattern of the segment, and the lead-out pattern of the electrode pattern is formed in each part within the effective display area of the liquid crystal display element. A color liquid crystal display element that is provided for each segment and has common wiring outside the effective display area. 3. A color liquid crystal display element according to claim 1, characterized in that segments on the opposite display side, which can be formed larger than each of the display segments, are connected to each other. 4. A color liquid crystal display element according to claim 1, wherein the color filter has stripe-like color filter layers of two colors alternately formed in the same direction as the comb-like electrode pattern. 5. A color liquid crystal display element according to claim 4, wherein the color filter is formed so as to completely cover the periphery of the comb-shaped electrode.