JPH01319093A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To improve the visual angle characteristics of the title device by arranging a transparent base plate provided with common electrodes and another transparent base plate provided with segment electrodes in parallel with each other and, at the same time, providing electrodes for displaying background and stripe-like color filters with plural colors. CONSTITUTION:Plural sets of fine stripe-like electrodes 10R and 10G for displaying transparent segments are formed on a transparent base plate 4 at the positions corresponding to a segment displaying section 2 and color filters 13G and 13R are alternately formed over a whole effective displaying area in corresponding to the electrodes 10R and 10G on the electrodes 10R and 10G. In addition, electrodes 11 for displaying background are formed on the color filters 13G and 13R in the form of a background displaying section 3. The stripe-like transparent common electrodes 12G and 12R corresponding to the color filters 13G and 13R are uniformly formed over the effective displaying area on another transparent base plate 5 faced to the base plate 4. Therefore, when a color light display is performed on the background displaying section 3 by applying voltages between the electrodes 11 for displaying background and common electrodes 12G and 12R, the visibility and quality feeling of the background are improved.

Description

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

(Prior Art) As an example of a conventional device, there is one described in Japanese Patent Application Laid-Open No. 11885/1985.

In a liquid crystal display device consisting of a common electrode and segment electrodes for displaying figures, the common electrode covers the display surface metal, and the segment electrodes cover the first layer forming the display figure and everything other than the display figure. It is formed by a second covering layer. According to this conventional device, negative display and positive display can be freely switched, and the lead line portion of the segment electrode of the first layer forming the display figure has a mask effect due to the segment electrode of the second layer. Since it is not involved in display, it can be placed in any position.

In addition, as another example of the conventional device, Japanese Patent Application Laid-Open No. 62-2271
There is one described in Publication No. 26.

In order to be able to change the color scheme of areas other than the display area, striped transparent electrodes are formed on the glass substrate for the common electrode, and an insulating film is formed on the glass substrate for the segment electrodes. to form three layers of electrodes, of the three layers of electrodes, the second and third layer electrodes cover the effective display area, and these second and third layer electrodes cover the effective display area. is constructed by connecting to the terminal of the cell through the first layer electrode.

(Problems to be Solved by the Invention) The first conventional device described above is designed to be able to freely switch between negative display and positive display, and no consideration was given to multicolor display.

In addition, the second conventional device assumes time-division driving when displaying a multi-color segment of the number of stages, and therefore has problems with time-division driving, such as poor viewing angle characteristics, contrast, and response speed. It had a point. Furthermore, in the configuration of this conventional device, the segment display electrode representing numbers is composed of a single electrode.
When static driving is used, there is a problem that the combination of display colors of the background display section and the segment display section is more limited than the combination of color filter colors used.

Specifically, the color filter color combination is R and G.
When the background display section is OFF (dark black), R (red), G (green), or RG (Y) (yellow), the display color of the segment display section will be RG (Y), G, respectively. ,R,0
There was a problem with not being able to get FFL.

The purpose of the present invention is to eliminate the problems of the conventional device described above,
The segment display section and the background display section can be lit and displayed by static driving, and even when statically driven, all the display color combinations that can be realized by combining multiple color filter colors are displayed on the segment display section and the background display section. The object of the present invention is to provide a liquid crystal display device that can be used.

In other words, the object of the present invention is to provide a liquid crystal display device that does not have the above-mentioned problems associated with dynamic driving and can realize many combinations of display colors of the background display section and the segment display section.

(Means for Solving the Problems) The above object is to form, on the first transparent substrate 1-, several sets of fine striped transparent electrodes as segment display electrodes for each display segment. Next, stripe-shaped color filters of multiple colors are formed over the entire effective display area of the display element in correspondence with the stripes of the segment display electrodes, and furthermore, a stripe-shaped color filter of a plurality of colors is formed on the color filter in a shape corresponding to the background display area. Form background display electrodes. In addition, on the opposing second transparent tile plate, multiple sets of striped transparent electrodes corresponding to the striped color filters of multiple colors formed on the first transparent substrate are arranged as common electrodes over the entire effective display area. This is achieved by forming.

(Function) The background display area is formed through a color filter, which is an insulating layer on the segment display electrodes. Since the liquid crystal in the background display section can be operated by applying a voltage between the common electrode and the common electrode, the background display section can also perform color lighting display according to the color filter color.

Further, the segment display section of the present invention can perform color lighting display by applying a voltage between the segment display electrode formed under the color filter and the striped common electrode formed on the counter substrate. In this case, the segment display electrodes are composed of multiple sets of striped electrodes for each segment, so even in static drive,
A desired display color can be obtained independently of the background display color.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a plan view showing an example of a liquid crystal display device according to the present invention, in which numbers are displayed using seven segments. In the figure, 1 is a liquid crystal display element, 2 is a segment display section, and 3 is a background display section.

The background display section 3 is a dark black section in the conventional TN transmission type negative display, but in the present invention, this section is called a background display section because it also participates in the lighting display. Note that this background display section 3 covers the entire effective display area of the liquid crystal display element 1.

Next, the internal structure of the liquid crystal display element 1 is shown in FIG.
Explain in detail. FIG. 1 shows a sectional view taken along the line A--A of the liquid crystal display element 1 shown in FIG. In the figure, the same symbols as in FIG. 2 indicate the same parts.

On the transparent substrate 4, two sets of fine striped transparent electrodes (segment display electrodes) IOR (for red display) and 10G (for line display) are arranged in the portion corresponding to the segment display section 2.
are formed, and further the segment display electrodes 10R,
On the IOC, there is a color filter 13G that corresponds to them.
(green) and 13R (red) are formed alternately, and these are formed extending to the entire effective display area.

Further, a background display electrode 11 having the shape of the background display section 3 shown in FIG. 2 is formed outside the segment display section 2 on the color filters 13G and 13R, and - of filters 13G and 13R
1-, an alignment control film 9 for controlling the alignment of liquid crystal molecules is uniformly formed.

Next, color filters 13G and 13R are provided on the liquid crystal 8 side of the transparent substrate 5 that faces the filled liquid crystal substance 8.
Striped transparent electrode (common electrode) 12G compatible with
(for line display) and 12R (for red display) are uniformly formed over the entire effective display area, and the liquid crystal 8 side of the common electrode is covered with an alignment control film 9. Note that in this embodiment, TNffl liquid crystal is used as the liquid crystal substance 8.

Further, a lower polarizing plate 6 is disposed on the outside of the transparent substrate 4, and a -plate polarizing plate 7 is disposed on the outside of the opposing transparent substrate 5.

Next, the segment display electrode 10G, IOR, background display electrode 11, and color filter 13G formed on the transparent substrate 4L- shown in FIG. 1.

A plan view of 13R is shown in FIG. As is clear from the figure, segment display electrodes 10R, 10 are provided on the transparent substrate 4.
G is configured in pairs. The segment display electrodes 10R and IOC each have a comb-teeth shape, and each set constitutes seven sets of segments.

It goes without saying that the seven sets of segments constitute the segment display section shown in FIG. 2.

Segment display electrode 1 forming the seven sets of segments
A lead pattern is formed in each of 0R and IOC, and each lead pattern extends to the segment display terminal 10T.

Fine striped color filters (insulating layers) 13R and 13G are formed on the segment display electrodes 10R and IOC over the entire white effect display area including the segment display section 2 and the background display section 3. . The striped color filters 13R, 13G are formed to correspond to the segment display electrodes 10R, IOC.

Furthermore, a background display electrode 11 is provided on the striped color filter 13R913G so as to cover the entire background display section 3. The lead pattern of the background display electrode 11 extends to the background display terminal LIT.

Next, FIG. 4 shows a plan view of the common electrodes 12R and 12G formed on the transparent substrate 5'' shown in FIG. 1.

The common electrodes 12R and 12G each have a comb-like shape, and are formed in a pattern in which these are combined with each other. The common electrode 12R.

The lead-out portions 12TR1 and 12TGl of 12G are the common electrode terminals 12T formed on the transparent substrate 4, respectively.
It is electrically connected to R, 12TO by means not shown. Moreover, the common electrodes 12R, 12G are
They are formed so as to face the segment display electrodes 10R and IOC in the segment display section 2, and to face the background display electrode 11 in the background display section 3, respectively.

Next, with reference to FIG. 5, an explanation will be given of the operation when the liquid crystal display device of this embodiment having the configuration as described in 1- is statically driven.

Is FIG. 5 the same as FIG. 1?
, color filters 13R, 13G.

The upper and lower polarizing plates 6, 7, etc. are omitted, and the segment display electrode 10G, IOR, which is a transparent electrode, and the background display electrode 11 are used.
Only the common electrodes 12R, 12G, and their lead terminals A to E are shown.

The A, B, and C terminals are the background display terminal 11T5 and the common electrode terminal 12TG in FIG. 3, respectively.

12TR, and D and EFJ are a pair of segment display terminals 10T, 10TR and 10TG, respectively.
shall represent.

Now, assuming that a square wave with a duty of 50% is applied to the A terminal, this is set as "θ", and this square wave with the opposite phase is set as "1", and the position of each application terminal is set to the eye relationship and the combination of display colors. The result is as shown in FIG.

As is clear from Fig. 6, when performing a background display, if the voltage applied between the A terminal and the B terminal or CmT is controlled, the background color can be dark black for OFF, red for R lighting, and red for 6 lighting. It is possible to select green or yellow with RG simultaneous lighting. Also,
Similarly, the segment display color can be selected from dark black, red, green, and yellow by controlling the voltages applied between the B and C terminals and the D and E terminals.

In Figure 6, if the background display color is set to OFF (dark black) and the segment display color is set to R, G or RG (Y), a negative display can be made, and the background display color is set to R, G or RG (¥).
If the segment I/display color is set to 0FF (dark black), positive display is possible.

Furthermore, it is clear that all combinations of background display colors and segment display colors can be used for display. That is, by applying a 50% duty square wave ("O") to the A terminal, and applying a square wave of the same phase ("0") or opposite phase ("1") to the B and C terminals, Four background display colors can be obtained. Also, D.

By applying a rectangular wave having the same phase or inverse tu to the rectangular wave to the E terminal, four segment display colors can be obtained for eight background display colors.

Note that the segment display electrode LOG according to this embodiment
, since the extraction pattern portion of the IOR is located below the background display electrode 11 and the corresponding color filter, the electrical influence of the extraction pattern portion on the liquid crystal material 8 is shielded by the electric current 11i11, and the background It is clear that this does not have the same negative effect on the display on the display.

As described above, according to this embodiment, it is possible not only to switch between negative display and positive display, but also to switch the display color of the display segment section and the display color of the background display section independently, and as a result, all the color filters A combination of colors can be displayed. Therefore, it is possible to provide a display with an unprecedented richness of color, and it is possible to obtain many excellent effects such as the enjoyment of display, improved visibility, improved quality, and expression of three-dimensional effect.

Furthermore, according to the present invention, since both the segment display section and the background display section can be controlled by static drive, the viewing angle range can be widened, and display colors with excellent display quality can be provided in a wide dynamic fi/temperature range from low to high temperatures. There is an effect that can be done.

In addition, in the above embodiment, Segmen!・The case where the display electrode, color filter and common electrode are two colors is shown, but
The present invention is not limited to R, G.

Of course, the three colors B may be used. In this case, R, G, B, RG, RB, GB, RGB and OFF
Eight segment display colors and eight background display colors can be obtained.

Further, in the embodiments marked with "-", a TN type liquid crystal is used, but similar effects can be expected even when a GH4t2 (guest-host type) liquid crystal is used.

(Effects of the Invention) According to the present invention, a large number of combinations of segment display colors and background display colors can be obtained, so that it is possible to display a color richer than ever before.

This also improves the enjoyment of display, further improves visibility and
Great effects can be expected in that the quality is improved and it becomes possible to express a three-dimensional effect.

Furthermore, since the segment display section and the background display section can be controlled by static driving, the viewing angle range can be widened, and the contrast and response speed can be improved.

It also has the effect of preventing changes in viewing angle direction and ambient temperature, and chromaticity.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a part of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a plan view of a liquid crystal display device according to an embodiment of the present invention, and FIG. A plan view showing the electrodes and color filters of a liquid crystal display device, Figure 4 is the opposite of Figure 3!
! FIG. 5 is a plan view showing temporary electrodes, FIG. 5 is a schematic cross-sectional view of electrodes of the liquid crystal display device of the present invention, and FIG. 6 is a diagram showing the operation of the liquid crystal display element of the present invention. 10R, IOC...Segment display electrode, 11...
・Background display electrode, 12R, 12G... common electrode,
13R, 13G...Color filter agent Patent attorney 1 Michito Hiramoto and 1 other person Figure 1 Figure 2

Claims (2)

[Claims] (1) In a liquid crystal display device in which a transparent substrate having a common electrode and a transparent substrate having segment electrodes are arranged in parallel and a liquid crystal is sealed in the gap between them, the common electrodes are arranged in plurality to cover the entire effective display area. The segment electrodes have a plurality of sets of stripe-like segment display electrodes configured for each display figure, background display electrodes that cover all effective display areas other than the display figure, and the segment electrodes have a stripe-like structure. It is characterized by being formed corresponding to a plurality of sets of stripe-like electrodes of segment display electrodes, and a stripe-like color filter of a plurality of colors formed by further extending the stripe-like color filters to cover the entire effective display area. A liquid crystal display device. (2) In the liquid crystal display device according to claim 1, the segment display electrode portion is statically driven;
A liquid crystal display device characterized in that the background display electrode section is also statically driven.