JPS59151139A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To execute selectively a switching control of two kinds of display modes without separating completely the display surface by providing a segment electrode group for constituting plural segments, and a control electrode which is separated from said group and formed. CONSTITUTION:In the first display mode for executing a picture display, the almost same potential is applied to all of a segment electrode 26 and a control electrode 28 on an opposed electrode substrate 24, and a scanning signal and a picture signal are supplied to an address line and a data line of a switch/ capacitor array formed on an array substrate 20. In this case, the segment electrode 26 and the control electrode 28 execute an operation of an opposed electrode in a usual device and a desired picture display is executed. In the second display mode, the same potential is applied to all of a display picture element electrode 23 and the control electrode 28 on the array substrate 20, and when a numeral display signal is supplied to plural segment electrodes 26, a desired time display is executed. As a result, two kinds of display modes such as a television display and a time display can be brought to a switching control selectively without separating completely the display surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device using a switch/gear/shifter array, and particularly to a liquid crystal display device that can switch and control two display modes such as television image display and time display. 1st place.

[Technical background of the invention and its problems]

Recently, development of multi-pixel, high-density liquid crystal display devices aimed at displaying images and graphics has been progressing.

In this display device, as a means to control the brightness or lighting/non-lighting of each pixel, a switch is used that uses semiconductor integrated circuit technology or thin film technology to form display pixel electrodes in a matrix shape, including switch elements and capacitors. /capacitor array is used.

FIG. 1 is an equivalent circuit for explaining a configuration example of a switch/capacitor array. 1 is M as a switch element
OSFET 2 is a MOS capacitor; 3 is a display pixel electrode that defines a pixel, and is electrically connected to a connection point between MOSFET 1 and MOS capacitor 2. MOSFET
1 darts are commonly connected for each row and address line Y
□ , Y2 , ..., Yn are provided, and their drains or sources are commonly connected for each column to form a data line xl.
tx21..., Xm are provided. MOSFET 1
, MOS capacitor 2, address line Yl aYQ
e..., Yn and data line X1 y Xm
H .

FIG. 2 is a sectional view showing a conventional liquid crystal display device using the switch/cabinet and shutter arrays shown in FIG. 1. Reference numeral 4 designates, for example, a silicon substrate on which a switch/capacitor array is formed, and a display pixel electrode 3 is formed on the surface of this substrate with a glabella insulating film 5 interposed therebetween. 7 is a counter electrode extending from the transparent conductive film, 8 is a transparent insulating substrate, 9 is a spacer and a sealing part, 10
is a liquid crystal layer, and 6 is a reinforcing substrate.

The operation of the liquid crystal display device shown in FIG. 2 is as follows. 1st
In the figure, address line Yl.

Y2, . . . , Yn are sequentially scan-driven by a scan signal from a scan drive circuit, and the MOSFET 1 is sequentially brought into conduction for a period of TF/n for each line.

This is the TF frame scanning period. When, for example, m parallel image signal voltages are supplied as data signals to the data lines X1 e It is held for a period of frame period TF. This held signal voltage is applied to the display pixel electrode 3 and excites the liquid crystal layer 10 sandwiched between the counter electrodes #i and 7.

As a result, an image is displayed.

Recently, watches (TV watches) have been developed that integrate this type of liquid crystal display device for displaying images and a segment type liquid crystal display device for displaying numbers. Figure 3 shows an example of this, where 1 is a television display unit using the liquid crystal display device explained in Figures 1 and 2, and 12 is a segment type liquid crystal display unit that has been used in ordinary electronic digital watches. This is the time display section.

As is clear from the figure, in such a television watch, since the television display section II is provided, the time display section 12 is forced to be pushed above (or below) the display surface. Therefore, there is a drawback that the number of the time display cannot be made sufficiently large, making it difficult to remove the V. In this state of the time display, which takes up a much larger proportion of time than a TV display, the display does not look good because the display only covers a small portion of one corner of the display surface.

These drawbacks can be solved in principle by using only the liquid crystal display device for displaying images on a television to also display the time. In other words, using only an image display liquid crystal display device using a switch/capacitor array, the fourth
As shown in the figure, when the entire display surface is a television display section 13 and no television display is performed, the center part of the display surface can be configured to display the time as a time display section 14.

However, making a watch with a TV only by repairing the liquid crystal display device for image display is not a good idea in terms of consumption π (power). This is because the capacitors are repeatedly charged and discharged through the elements, which consumes much more power than segment-type liquid crystal display devices, which is used for constant, continuous time display. .

[Purpose of the invention]

The present invention has been made in view of the above points, and it is possible to selectively switch and control two types of display modes such as TV display and time display without completely separating the display surfaces, and moreover, it is possible to control switching between two types of display modes such as TV display and time display without completely separating the display surfaces. It is an object of the present invention to provide a liquid crystal display device that greatly reduces power consumption.

[Summary of the invention]

The present invention is based on a liquid crystal display device for displaying images using a switch/gear center array, and the counter electrode substrate thereof includes a group of segment electrodes constituting a plurality of display segments, and a region other than the area covered by the segment electrodes. A structure is used in which a flint pipe 1 is formed so as to be electrically separated from the segment electrode so as to cover the entire area of the segment electrode. Therefore, the first display mode is the segment) '
With the Mi pole 11[ and the control '11j pole as opposing co-tracing poles,
Thick switch/gear 9-seater array (move to display pixel 1)
[1, Deciding on the pole: Apply the No. 44 voltage to display the TV display, etc., and set the second display mode C1 switch/car.
These display modes are switched and controlled by selectively applying a signal voltage to the group of segment electrodes using the display pixel electrodes on the side of the seven-shita array as jIb electrodes to display time and the like.

〔Effect of the invention〕

According to the present invention, when applied to a TV publication watch, for example, as shown in FIG. It is possible to obtain an easy-to-read and attractive lIJ clock display state. And this segment? In the second display mode using the LCD, the operation of the switch/gear two-seater array is static, similar to that in conventional segmented LCD displays.

Power consumption is small, and there is no problem even if it is operated regularly.

[Embodiments of the invention]

FIG. 5 is a 1171-plane view showing a liquid crystal display device (1) according to an embodiment of the present invention. Reference numeral 20 indicates a substrate A1/A, in which, for example, switches/cancelles/relays are integrated and formed on a silicon substrate 2, and display pixel electrodes 23 are arranged and formed on the surface thereof via an interlayer insulating film 22. . The counter electrodeposition substrate 24 facing the array substrate 20 is a transparent insulating substrate 2.5 made of glass or the like, and this surface treatment first layer transparent conductive film is applied and/or turned to form segment electrodes 26. Depositing the second layer transparent conductive film through the transparent insulating film 27 1~
A control type i@2g is formed by patterning. A display device is constructed by sandwiching a liquid crystal layer 29 between such an array substrate 20 and a counter electrode substrate 24. 30 is a suitcase, 1 is a kimono a, and 31□
, 312 is the segment electrode 26 on the counter electrode substrate 24 side,
Control ta, d* for outputting the camellia 28 to the Dlrl parts 28 and 32z provided on the array substrate 20 side, respectively.
'it member 33 is a reinforcing board.

6(,) to (C) are the electrodes 9 on the counter electrode substrate 24 side.
[Manufacturing the turn] The second non-exhibition is shown below. As shown in (a), the segment electrodes 26 made of a single layer of transparent electrodes H are arranged and formed approximately at the center of the substrate 25, that is, at the center of the display surface. Each segment box frame 26 is led by a wiring 34 to a terminal 35 at the end of the board 25. The control electrode 28 made of the second layer transparent conductive film is (
As shown in b), it is arranged so as to cover the entire area except for the area of the segment electrode 26 and the area of its terminal 36. Around the counter electrode substrate 24 formed in this way, (C)
As shown in FIG. 3, a liquid crystal container is formed by providing a sealing material a3θ on the surface and bonding it to the array substrate 20.

The display operation of the liquid crystal display device configured as described above will be explained next. In the first display mode for displaying images, the facing M
All of the segment electrodes 26 and 8j control electrodes 28 on the L-substrate 24 are given approximately the same 1F, and the address lines and data lines of the switch/cancel array formed on the play substrate 20 are As explained in FIG. 2, the scanning signal and I[f! I will provide you with a statue. At this time, the segment electrode 26 and the control electrode 2
8 is 1! of the counter electrode in the conventional device shown in FIG. The desired image is displayed.

Next, in the second display mode in which the time is displayed, all the display images on the Al/I substrate 20 are
Approximately the same potential is applied to the segment electrodes 26 for counting, and a numeric display signal is supplied to the segment electrodes 26 for counting.

At this time, the display pixel electrode 23 functions as a counter electrode facing the segment electrode 26, and a desired time display is performed. The control electrode 28, which is still given a constant potential, covers the wiring 34 that sends a signal voltage to each segment electrode 26, and
This prevents the wiring 24 from lighting up.

In order to apply the same voltage to all the display pixel electrodes 23, in the circuit of FIG. 1, address lines Y1yY2+...
・, Yn are supplied with a voltage that passes through MOSFET 1, and the data lines X1, x, . . .
It is better to supply the same voltage to all of them. Although this type of drive can be realized by devising the line drive circuit itself, it is easier to provide a switch in the ground line side wiring of the address line drive circuit and turn off this switch to control all addresses. All you have to do is give power ■1st place to life. The address line drive circuit normally outputs a drive voltage to only one of n output terminals in order to sequentially drive the address lines Yl*Y2r..., Yn, but as mentioned above, the drive voltage is output to only one of the n output terminals. By separating the line side, the entire output can be made into a power source. A data line drive circuit is originally capable of outputting any signal voltage to its m output terminals, so all outputs can be kept at a constant potential depending on the input signal, but as with the address line drive circuit, grounding A method may be adopted in which a changeover switch is provided on the line side and the entire output is set to frost and source voltage by operating this switch.

As explained above, this embodiment uses an array substrate in which display pixel electrodes each having one switch element are arranged in a liquid crystal display having two display modes such as image display and numerical display. A device is obtained. When this device is used as a television watch, it is possible to switch between the television display and the time display at the center of the display surface, making the time display easier to read and more visually appealing than in conventional devices with a divided display surface. Furthermore, the operation of the switch/capacitor array when displaying the time is static, and power consumption is low. Furthermore, a switch is installed on the ground wiring side of the line drive circuit to
If a method in which the capacitor array is statically driven is used, the supply of the time display signal is controlled by this switch and a switch that moves quickly, thereby making it easy to switch between the television display and the time display. In addition, on the counter electrode substrate side, segment electrodes are formed from 1N transparent 2BTLi'LQ, and juice 1,
Since the area other than the segment formwork is covered with the two-layer transparent conductive cover, lighting in the wiring portion that supplies signal voltage to the segment electrodes is prevented.

[Brief explanation of the drawing]

Figure 1 υ is an equivalent circuit diagram to clarify the configuration of the switch/capantor array, Figure 2 is a cross-sectional view of a conventional liquid crystal display device using this array substrate, and Figure 3 is a diagram of a conventional television set. FIG. 4 is a diagram showing the display section of a preferred TV watch. FIG. 5 is a sectional view showing a liquid crystal display device according to an embodiment of the present invention. FIGS.
c) The electrode pattern of the counter electrode substrate is manufactured in step 11.
It is a figure shown in 1M. 20...71/A substrate, 21 silicon substrate, 22...
・Is it interlayer insulation H or 23...display pixel? (・Koku, 24・
...Counter electrode substrate, 25...Transparent insulating substrate, 26...
・Segment frost 5 (first layer transparent conductive film), 27...
Transparent A color powder type y128...Controlling 1 electrode (2nd layer Xunming ↑b1 欣), 29... N1V crystal 9 1゜Applicant's attorney Takeshi Suzue 1st patent attorney Figure 152 Figure n Figure 3 IAt Figure 5 Figure 4 1□□□□□□□, +□□ノ0 Figure 6

Claims (3)

[Claims] (1) A switch/cano nine-seater array and a large number of display images selectively driven by the array substrate are integrally formed on the substrate, and a liquid crystal is placed between the opposing box facing the array substrate and the polar substrate. In a liquid crystal display device constructed by sandwiching layers, the counter electrode substrate includes a transparent insulating substrate and a first transparent conductive layer t1. The segment electrodes constituting the plurality of display segments formed by the waist, including the area other than the area covered by at least the previous IfJ segment electrode frame group on the transparent insulating substrate, and the segment electrode group is It is composed of a control rod made of a second layer transparent wire film which is electrically insulated, and a 111th segment rod (6 groups and f!
i. A first display mode in which the control electrode is set at a predetermined potential and No. 41 voltage is selectively applied to the display pixel electrode, and the display pixel electrode and control electrode are set at a predetermined potential and the segment electrode A liquid crystal display device characterized by having a second display mode in which a signal voltage is selectively applied to groups. (2) The display device according to claim 1, wherein the segment electrode group is formed approximately at the center of the substrate. (3) The liquid crystal display device according to claim 1, wherein the first display mode displays an image, and the display mode of the rabbit 2 displays a time.