KR940009147B1 - Plasma address type lcd - Google Patents

Abstract

The device solves the problem of voltage drop in the plasme addressing part, and equally discharges in the total sacnning lines. The device includes a liquid crystal part (11) which has a transparent front panel (10), a middle panel (50), a data electrode (30) and a reverse layer and a liquid layer (40), and a plasma addressing part (21) which has a reverse panel (20), a ground electrode (70), an insulator layer (80), and a scanning electrode (60). The scan electrode has a matrix shape, and the ground electrode connects to the current limit resistor. The insulation layer is on the scan electrode.

Description

Plasma Address Type Liquid Crystal Display Device

1 is a schematic exploded perspective view of a conventional plasma address type liquid crystal display device.

FIG. 2A is an enlarged fragmentary sectional view of the display device shown in FIG. 1; FIG.

2B is an equivalent circuit diagram of a conventional plasma address type liquid crystal display device.

3 is a schematic exploded perspective view of a plasma address type liquid crystal display device according to the present invention.

FIG. 4A is an enlarged fragmentary sectional view of the display device shown in FIG. 3; FIG.

4b is an equivalent circuit diagram of a plasma address type liquid crystal display device according to the present invention;

* Explanation of symbols for main parts of the drawings

10: face plate 11: liquid crystal shutter portion

20: rear plate 21: plasma addressing unit

22 scanning line 23 groove

30 data electrode 40 liquid crystal layer

50: intermediate substrate 60: scan electrode (scanning line)

70 ground electrode 80 insulating layer

90: resistance

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma addressed liquid crystal display device, and more particularly to a plasma addressed liquid crystal display device having a newly improved structure of a plasma addressing unit.

Display devices include traditional cathode ray tubes using high-speed electron beams, fluorescent display tubes using low-speed electron beams, plasma display devices using gas discharge, and E.L. There are various kinds of display devices, liquid crystal display devices using an electro optical effect, and the like.

These various display apparatuses are selectively applied according to their characteristics because they have different functions and structural characteristics, and their common features are that they visualize electrical image signals or data signals, and various structural and functional improvements are made. have.

The recent trend of the opening of the display device (dispay device) is to develop a display device having a very high definition and a thin screen due to the demand for a mass information display medium and the emergence of a large-screen high-definition television (HDTV).

According to the development trend, a new type of matrix type display device, which is a combination of a plasma discharge device and an electric field optical device, that is, a liquid crystal display device, has recently been developed.

The display device is a method of addressing lines one by one by plasma discharge, and has an arrangement structure in which a plurality of data electrodes 30 on a stripe are arranged in parallel as shown in FIG. The liquid crystal shutter unit 11 and the plasma addressing unit 21 in which a plurality of unit scan lines 22 are provided in a direction orthogonal to the data electrodes 30 of the liquid crystal shutter unit 11 overlap each other. A background light generator (not shown) is usually provided on the back of the plasma addressing section 21 as an EL display element or a cold cathode ray tube.

Specifically, the liquid crystal shutter unit 11 includes a transparent face plate 10 and a transparent intermediate board 50 between the front plate 10 and the intermediate board 50. The liquid crystal 40 is injected into the substrate, and a stripe-shaped data electrode 30 is formed on the rear surface of the front plate 10.

The middle substrate 50 of the two substrates has a thin thickness of about 50㎛ and plays a very important role in the alignment of the liquid crystal. In the plasma addressing unit 21, a plurality of grooves 23 are formed on the rear plate 20 to form the scanning lines 22 in a direction orthogonal to the stripe pixel. And a ground electrode 70 and a scan electrode 60 are arranged side by side in the longitudinal direction on both sides of the bottom surface of each groove 23.

In such a state, the back plate 20 is fixed in close contact with the intermediate substrate 50 of the liquid crystal shutter unit 11 so that the groove 23 forms a single closed discharge space where the discharge gas is formed. It will be charged.

One stripe pixel selected by sequentially applying a data signal to the stripe-shaped data electrode 30 of the liquid crystal shutter unit 11 selectively passes dot light together with one plasma scanning line 22. It works. Scan signals are instantaneously applied to the plasma addressing unit 21 to exert linear DC discharge light on the selected scan line 22. Accordingly, a data signal is applied to the liquid crystal shutter unit 11 on the upper portion of the discharge line on one side by the scan signal, that is, in an electrically applied state, so that the data signal is orthogonal to the discharge line 22. When any one of the stripe pixels is selected, an electric field is formed at the intersections thereof, and rearrangement of the liquid crystal layer 40 located therein occurs, so that light from the back light generator located at the back of the discharge part is passed. Is made (that is, it forms a single firing point).

In such a display device, it can be seen that the liquid crystal shutter unit 11 and the plasma addressing unit 21 are electrically capacitively coupled through the intermediate substrate 50. That is, when a discharge occurs between the ground electrode 70 and the scan electrode 60 in the discharge line, the entire discharge line becomes ionized (Ionized stste), and the intermediate substrate 50 in contact with the discharge line 22 follows the discharge line 22. In this state, when the data signal having a relatively negative potential is input to the data electrode 30 in this state, the liquid crystal is moved by the potential difference, thereby displaying an image.

In order to display a more responsive image in the liquid crystal display device having such a structure, a fast and stable discharge should occur in the plasma addressing unit 21. In the case of the conventional plasma addresser liquid crystal display device, the ground electrodes disposed side by side ( Since a direct current discharge occurs between the 70 and the scan electrode 60, it is very difficult to obtain a uniform discharge. An equivalent circuit diagram of a conventional plasma address type liquid crystal display device or the like in which a uniform discharge is generated by connecting a resistor to a scan electrode to solve the above drawback is shown in FIG. 2B.

However, in the conventional liquid crystal display device, as shown in the equivalent circuit diagram of FIG. 2B, a voltage drop due to the resistor R occurs during the partial discharge.

Therefore, since the potential is subtracted from the applied voltage minus iR, a very high voltage is required to evenly discharge the entire BCDE part. Excessive discharge occurs in the A part close to the voltage application end. There is a problem that the life of the electrode is shortened.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma address type liquid crystal display device that can improve the above problems.

In order to achieve the object of the present invention, in the present invention, a transparent front plate, an intermediate substrate and a back plate are sequentially arranged at predetermined intervals, and a plurality of stripe-shaped data electrodes and a liquid crystal layer sequentially arranged between the front plate and the intermediate substrate are sequentially. In the plasma address type liquid crystal display device having a plurality of parallel discharge lines provided between the intermediate substrate and the back plate orthogonal to the data electrode and having an electrode to enable discharge through the entire discharge line, the back plate The ground electrode and the scan electrode are arranged in a matrix on the upper surface of the substrate through an insulating layer, and a predetermined resistance is connected to one end of each ground electrode, and a free end of each resistance is connected in common. have.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 schematically shows a plasma address type liquid crystal display device according to the present invention, which is composed of a liquid crystal shutter unit 11 and a plasma addressing unit 21 as is conventional. Background and generator (not shown) are provided.

The liquid crystal shutter unit 11 has the same structure as that of a conventional plasma address type liquid crystal display device, and includes a transparent front plate 10 and an intermediate substrate 50 and data electrodes 30 and alignment layer layers sequentially formed therebetween. And a liquid crystal layer 40.

The plasma addressing unit 21 is formed on the back plate 20 and the upper surface of the back plate via the stripe-shaped ground electrodes 70 arranged in the same direction as the data electrodes and the insulating layer 80 arranged in the direction orthogonal thereto. It consists of a stripe scanning electrode 60 which forms a ground electrode and a matrix. Each ground electrode 70 is connected with a resistor to prevent a voltage drop to generate a uniform discharge, and the upper surface of the scan electrode 60 is in direct contact with the intermediate substrate 50.

According to the present invention, when the other end of the current limiting terminal is connected to one of the ground electrodes 70 one by one as shown in FIG. 4b, the scan (scanning) electrode as shown in FIG. 2b. It is possible to solve the problem of voltage drop that occurs when only one resistor is connected. In addition, it is not possible to change the voltage value applied to each electrode by different resistance values connected to the ground electrode 70, and to form an insulating layer on the scan (scanning) electrode 60 again to prevent the potential from being applied to the intermediate substrate 50. You can do this. When the background light generator is used, the ground electrode 70 may use a transparent electrode such as ITO. The ground electrodes 70 having respective current limiting resistors may be connected to each other in common at the same time or may be separately connected to each other. The driving method of the liquid crystal display device according to the present invention having the above structure is similar to the conventional bar structure due to the structural characteristics of the plasma addressing unit 21 is formed by the discharge from the plasma addressing unit 21 at the same time selected one When a data pulse is written (input) to the data electrode 30, an electric field is formed in the liquid crystal layer 40 at the intersection of the data electrode and the scan electrode 60, so that the alignment of the liquid crystal is achieved. It will allow the passage.

The present invention connects a current limiting resistor to each ground electrode in order to solve the voltage drop occurring in the plasma addressing unit. The present invention can be driven at a general voltage (PDP voltage) and is uniform across all scan lines. There is an advantage that can cause a discharge.

Claims (2)

In a plasma address type liquid crystal display device in which transparent front plates, intermediate substrates and back plates are sequentially arranged at predetermined intervals, and a plurality of parallel data electrodes and liquid crystal layers are sequentially provided between the front and intermediate substrates. A stripe-shaped ground electrode is formed on the upper surface of the plate in the same direction as the data electrode, a scan electrode is formed in a matrix orthogonal to the ground electrode through an insulating layer, and a current limiting resistor is connected to the ground electrode. A plasma address type liquid crystal display device. The liquid crystal display device of claim 1, wherein a stripe-shaped insulating worm is formed on the upper surface of the scan electrode in close contact with the intermediate substrate.