KR0156491B1 - Flat display device of matrix type - Google Patents

Abstract

The present invention discloses a matrix flat panel display having a novel configuration.

Conventional flat panel display devices have a problem in that light emission luminance is low, gray level display is impossible, image quality is low, and image display is impossible in case of disconnection.

In the present invention, at least one electrode is composed of a plurality of electrode lines to realize a uniform and high luminous luminance, and even in the case of a disconnection lamp, normal operation is guaranteed, and in particular, gray scale display is possible to realize high quality images.

Description

Matrix flat panel display

1 shows a PDP as an example of a conventional flat panel display, in which (a) is a cross-sectional perspective view and (b) is an equivalent plan view.

2 is an equivalent plan view showing a flat panel display of the present invention.

3 is a block diagram showing an example of the preferred control configuration.

4 is a waveform diagram illustrating the operation.

* Explanation of symbols for main parts of the drawings

K: electrode (for example, cathode) consisting of a plurality of electrode lines

K1 to K3: electrode wire A: (opposite side) electrode (for example, anode)

B: Barrier C: Discharge Cell

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matrix flat panel display, and more particularly to a light emitting flat panel display.

There are various types of flat panel display devices such as Plasma Display Panel (PDP), Liquid Crystal D isplay (LCD), or Electro luminescence (EL), except for LCDs, which use liquid crystal materials to change light transmission characteristics under electric fields. The other flat panel displays are light emitting flat panel displays that emit light by themselves.

In order to display an arbitrary image with such a flat panel display, pixels must be arranged in a matrix. FIG. 1 illustrates a configuration of a PDP.

In FIG. 1A, an electrode group, for example, an anode A, extends in a predetermined direction to each discharge cell C partitioned by a partition B on the rear substrate R side. ) Is arranged, and a cathode K intersecting this anode A is arranged on the front substrate (not shown). In the case of the PDP, the discharge gas is charged in the discharge cell C, and the light is emitted by the discharge between the anode A and the cathode K when the discharge cell C is selected.

That is, in each discharge cell C of the general flat panel display device, the anode A and the cathode K that cross each other are arranged in a 1: 1 correspondence as shown in FIG.

However, this configuration has a small discharge area facing each other between the anode A and the cathode K, making it difficult to cause sufficient discharge and light emission. In addition, since the anode (A) is located on the projection path of light, it is inconvenient to install the anode (A) adjacent to the partition wall (B) in order to prevent a decrease in the light transmittance. Becomes difficult.

In addition, in the case of PDP, since the threshold voltage at which discharge is started is high, it is very difficult to express a so-called gray scale that appropriately adjusts the degree of light emission as necessary. This problem is one of the fundamental problems of the PDP because the display of the image on the PDP to display the image without depth and low sharpness.

In addition, as the flat panel display becomes higher resolution, the width and pitch of the electrodes such as the cathode (K) and the anode (A) are further reduced. When the electrodes are partially shorted, the corresponding line is not displayed at all. There was also a problem that the entire display device had to be replaced.

In view of the various problems of the related art, an object of the present invention is not only to provide a screen of high brightness due to high discharge intensity and light transmittance, but also to operate normally in the case of disconnection, and to display gradations as necessary, thereby providing a clear image. It is to provide a flat panel display device that can be implemented.

In order to achieve the above object, a flat panel display device according to the present invention is a flat panel display device in which two electrodes facing each other are arranged in a matrix shape.

At least one of the two electrodes is characterized by consisting of a plurality of electrode lines parallel to each other.

An electrode composed of a plurality of electrode lines is preferably an electrode, a cathode, or a data electrode provided on the front substrate side. In addition, the plurality of electrode lines may be formed of metal electrodes such as metal wires or sheets.

The plurality of electrode lines may be electrically separated from each other or may be connected in common. In particular, the plurality of electrode lines may be multi-level grayscale displayed.

Such specific features and advantages of the present invention will become more apparent from the following description of the preferred embodiments with reference to the attached drawings.

In FIG. 2, electrodes A and K that cross each other in a matrix form are partitioned into partitions B at each intersection to form discharge cells C. In FIG. According to the present invention, one of the two electrodes A and K is composed of a plurality of electrode lines K1 to K3. Accordingly, in the discharge cell C, the electrode A on the opposite side, for example, the anode intersects the plurality of electrode lines K1 to K3 at a plurality of positions.

The electrode K composed of the plurality of electrode lines K1 to K3 is preferably an electrode arranged on the front substrate side, and a cathode for writing data is usually arranged on the front substrate side, so that the electrode K is a cathode or a data electrode. Becomes Of course, if necessary, the opposing-side electrode A, for example, the anode can also be composed of a plurality of electrodes, and both the electrodes A, K can be composed of a plurality of electrode lines. On the other hand, the plurality of electrode lines (K1 ~ K3) may be composed of a printed electrode, but preferably a metal electrode, in particular a wire type.

Thus, when at least one electrode K is comprised by the some electrode line K1-K3, the following effects can be expected.

The plurality of electrode lines K1 to K3 may be connected in common and may be applied with the same voltage or may be electrically separated from each other to apply separate voltages. Referring to the case where the common connection is made first, since the plurality of electrode lines K1 to K3 oppose the opposing electrode A over a wide range, uniform discharge and light emission are generated, the light emission intensity is increased, and the generated light is a plurality of electrode lines. The light transmittance is also improved by being transmitted into the space between K1 and K3. In addition, even when some electrode lines K1 to K3 are disconnected or short-circuited, normal operation may be performed by the remaining electrode lines K1 to K3.

On the other hand, when a plurality of electrode lines K1 to K3 are electrically isolated and a separate voltage is applied, not only the operation during the common connection but also the gradation display can be performed. That is, since discharge or light emission occurs when a potential difference of more than a threshold voltage exists between each of the electrode lines K1 to K3 and the opposite electrode A, the n electrode lines K1 to K3 are selectively driven when they are present. At least n + 1 levels of gradation can be displayed. For example, in the illustrated embodiment, since three electrode lines K1 to K3 exist, gray scale display in at least four steps (0, 1, 2, 3) is possible.

FIG. 3 shows an example of a driving circuit which performs gradation display by electrically separating the electrode lines K1 to K3 in this way. The two longitudinal electrodes A and K arranged in a matrix are provided with driving circuits DRIV-A and DRIV-K for applying respective control voltages. Here, an electrode K composed of a plurality of electrode lines K1 to K3, and a gray scale display circuit GS is provided between the driving circuit DRIV-K and the electrode K on the lateral electrode side in the drawing.

In general, since the write voltage is applied to the longitudinal electrode A, and the data voltage is applied to the horizontal electrode K. Referring to this, the voltage corresponding to the display data is indicated by the horizontal driving circuit DRIV-K. This data is shifted and supplied. The data includes gray level signals as well as ON / OFF signals. Accordingly, the gray scale display circuit GS branches and shifts the driving voltages of the electrode lines K1 to K3 by multiplexing the data voltage shifted from the driving circuit DRIV-K.

This operation will be described in more detail with reference to FIG. 4.

As shown in FIG. 4 (a), when it should be displayed as ON or HIGH for a time between t1 and t3, the conventional driving circuit shifts it as it is so that the corresponding pixel is turned on. In contrast, according to the present invention, a gradation level can be provided for each time t1 to t3. That is, when the gray level signals of 1, 3, and 2 are applied to t1 to t3, the gray scale display circuit GS displays the waveform of FIG. 4 (a) applied from the driving circuit DRIV-K. Convert the waveform to.

For example, there are three electrode lines K1 to K3, and only the center electrode line k2 is HIGH when displaying the gradation step 1, and when the display of 2, the electrode lines K1 to K3 on both sides are HIGH, and when displaying the gradation step 3 When all of the electrode lines K1 to K3 are HIGH, the waveform output from the gray scale display circuit GS and shifted is shown in FIG. 4B. That is, the center electrode line K2 becomes HIGH only for time t1 to t3, and the electrode lines K1 and K2 on both sides become HIGH only for time t2 to t3.

When the converted data voltage is shifted along each of the electrode lines K1 to K3 to reach the application position of the write voltage to the opposing longitudinal electrode A, the corresponding pixel, for example, the discharge cell, emits light to generate a multi-level gray scale. An image having a is displayed. Accordingly, the user is provided with a deep and clear image that cannot be obtained with the conventional flat panel display.

As described above, according to the present invention, it is possible to provide a high luminous luminance and a clear image, and has a great effect of implementing a flat panel display having high reliability and durability.

Claims (9)

A flat panel display device in which two electrodes facing each other are arranged in a matrix shape, wherein at least one of the two electrodes comprises a plurality of electrode lines parallel to each other. The matrix type flat panel display of claim 1, wherein the plurality of electrode lines are connected to each other in common. The matrix type flat panel display of claim 1, wherein the plurality of electrode lines are electrically separated from each other. The matrix type flat panel display of claim 3, wherein different control voltages are applied to the plurality of electrode lines. The matrix type flat panel display according to claim 3 or 4, wherein the plurality of electrode lines are selectively driven to display multi-level gray scales. The matrix type flat panel display of claim 1, wherein an electrode composed of the plurality of electrode lines is a cathode. The matrix type flat panel display of claim 1, wherein an electrode formed of the plurality of electrode lines is a data electrode. The matrix type flat panel display of claim 1, wherein an electrode formed of the plurality of electrode lines is formed of a metal electrode. The matrix type flat panel display of claim 1, wherein the flat panel display is a plasma display.