EP1215649A2 - Plasma display panel - Google Patents

Abstract

The invention relates to an arrangement with a plasma screen (3). It is first provided that in such an arrangement with a plasma screen (3), which has cells for generating image points between a light-transmitting pane (10) facing the viewer and a rear wall (11) and which in the areas (13 ) opposite outer edges of the rear wall (11) for contacting the cells has electrical contacts, which by means of largely parallel current leads (2) with electronic circuits (4, 6, 7) arranged on the outside of the rear wall (11) facing away from the cells are connected in such a way that the current leads (2) terminate in an electrically separate manner in a narrow contact area (14), where an electrical contact is made between the current leads (2) on the one hand and the electrical circuits (4, 6, 7) on the other.

Description

The present invention relates to an arrangement with a plasma screen.

TVs with plasma screens currently available on the market require one considerable effort when it comes to shielding electromagnetic fields. So is under other a solid aluminum or metal housing in connection with a metal coated windscreen required to meet legal requirements to be able to meet electromagnetic compatibility. These shielding measures are expensive on the one hand and increase the weight of the devices on the other.

The object of the present invention is to provide the circuits and power supplies Control of such a plasma screen to improve the radiation electromagnetic waves is reduced and additional shielding measures are superfluous.

According to the invention, the object is achieved in a first way in that Arrangement with a plasma screen, which is between a viewer facing front translucent pane and a rear wall cells for generating pixels and which in the areas opposite outer edges of the rear wall for contacting the cells has electrical contacts, which by means of largely parallel current leads with arranged on the outside of the rear wall facing away from the cells electronic circuits of the type connected to the power supplies electrically isolated ends in a narrow contact area where an electrical contact between the power supplies on the one hand and the electrical circuits on the other will be produced.

This is a modified arrangement of the circuits for controlling the Plasma screen the current conduction between the display boards and the electrodes of the Pixels of the screen changed so that the radiation is reduced. For that are the Power leads to the connections of the electrodes of the plasma display do not like hitherto customarily only present in the edge areas of the plasma screen, but instead lead them over the entire back of the plasma screen and come from both sides in a narrow contact area perpendicular to the current leads. This Area of the plasma screen prevents antenna-shaped radiation from electromagnetic fields because the current leads come from both sides end electrically separated immediately next to each other. With such an arrangement In principle, the radiated electromagnetic fields of the Power leads to the electrodes with the fields on the inside of the current wall runs and ideally lift each other on. This is an expensive and weighty shielding like conventional ones Plasma screens are superfluous. Because both the stops for the on the windshield running electrodes as well as for the electrodes running on the rear wall can be guided outside and attached to the edge of the rear wall connect all electrodes to the current leads according to the invention and to Lead contact area.

By a conductive printed connection as claimed in claim 2, the Manufacture power supplies inexpensively and technically simply by clicking on be applied to the back of the plasma screen.

The embodiment according to claim 3 allows the reuse of the known existing Connections via flexible lines to a shield according to the invention To achieve claim 1.

The present object is achieved in a second way by the subject matter of claim 4 solved. The current paths to the contact points of the electrodes can also be shortened in this way, by the circuits for controlling the pixels directly on the outside of the rear wall of a plasma screen are mounted. This will make the The leads to the electrode connections are shortened again. Also shorten common buffer capacitors the current paths between the electronic circuits for the driver stages of the X electrodes and the Y electrodes. Together with the Design according to claim 1 is a particularly effective suppression of the radiation electromagnetic waves possible. At the same time is a solution with common ones Buffer capacitors much cheaper than with separate buffer capacitors for each Driver stage.

With the embodiment according to claim 5, the advantages of the invention in an end product such as a TV or monitor, which is cheaper can be produced.

Figur 1 eine schematische Darstellung der einzelnen Komponenten eines Plasmabildsdschirms,

Figur 2 ein Blockschaltbild eines herkömmlichen Plasmabildschirms mit eingezeichneten Stromverläufen,

Figur 3 einen Plasmabildschirm mit einer gemeinsamen Platine für die beiden X-/Y-Treiberstufen mit einem zentralen Anschluss der Stromzuführungen zu den Elektroden des Plasmabildschirms,

Figur 4a den herkömmlichen Stromverlauf auf der Rückseite eines Plasmabildschirms,

Figur 4b die verbesserte Stromführung auf der Rückseite eines Plasmabildschirms,

Figur 5 die neuartige Führung der Stromzuführungen der vorderseitigen X-/Y-Elektroden zum Kontaktbereich auf der Rückseite eines Plasmabildschirms und

Figur 6 eine Draufsicht auf die Rückseite eines Plasmabildschirms mit erfindungsgemäßen Stromzuführungen.

Exemplary embodiments of the invention are explained in more detail below with the aid of a few figures. Show it:

FIG. 1 shows a schematic illustration of the individual components of a plasma picture screen,

FIG. 2 shows a block diagram of a conventional plasma display screen with current curves drawn in,

FIG. 3 shows a plasma screen with a common circuit board for the two X / Y driver stages with a central connection of the power supply lines to the electrodes of the plasma screen,

FIG. 4a shows the conventional current profile on the back of a plasma screen,

FIG. 4b shows the improved current routing on the back of a plasma screen,

Figure 5 shows the novel routing of the power supply lines of the front X / Y electrodes to the contact area on the back of a plasma screen and

Figure 6 is a plan view of the back of a plasma screen with power supplies according to the invention.

As can be seen in FIG. 1, an arrangement according to the invention mainly consists of the actual plasma screen 3, on the back of which there are power leads 2, which the plasma screen 3 with the electronic circuits for controlling the Connect the pixels of the plasma screen 3. The electronic circuits exist among other things from the two driver stages 6, 7, which are the two different Control electrode groups, the X electrodes and the Y electrodes. The driver stages get their electricity from a supply module 8, for example. a switching power supply. The pixels are selected by means of further circuits 4, 9, the circuit 4 selects the rows of the plasma screen 3 and the circuit 9 selects the columns. The The pixels are selected by the two Circuits 4, 9 depending on the image information present. These are from provided a circuit 5 for image processing.

If a pixel is activated, the pixel lights up and flows through the Electrodes and the current leads 2 and through the current leads between the Contacts 13 and the individual electrodes of the pixels are relatively high and above all high frequency currents. In doing so, electromagnetic waves from the current-carrying Compounds 2 emitted. These are recognizable in Figure 2 by thick black lines made, while only weak currents flow in the dashed lines, their electromagnetic Fields are negligible. The high currents span with the associated backflows on an area, with a large area having a high electromagnetic Radiation means. Therefore, with the present invention, these Surfaces are reduced so that the electromagnetic fields of the flowing currents and largely compensate for the backflowing currents. From a certain distance from the plasma screen 3, the fields are almost as good. In addition, the Contacting the power supplies 2 with the driver stages 6, 7 in a narrow Contact area 14. This allows the ends of the Power supply lines 2 do not act like antennas and emit electromagnetic waves. The best effect can therefore be achieved if the power supply lines are electrically opposed to one another isolated ends immediately next to each other. This is shown in Figure 6. The contact area 14 can also be shifted from the center, but it is important that it moves over the whole Width of the rear wall 11 extends transversely to the power supply lines 2.

For a particularly small radiation area, the current leads 2 are used directly as conductive Coating applied to the back of the rear wall 11. The back one Wall 11 is currently made of glass for structural reasons, but can also be made of one temperature-resistant other material, since transparency is not required and on the contrary, light from the pixels also lets through to the rear, which is undesirable is.

The new construction of the power supply lines 2 offers the decisive advantage. While in conventional plasma screens the driver stages 6, 7 for the X and the Y electrodes are housed on separate boards and during voltage transitions the currents are conducted via the earth return, the invention does not Arrangement on such a current supply via the earth return. Furthermore, the Driver boards 6, 7 arranged centrally and via power supplies 2 with the X / Y electrodes connected. This can be achieved in that, as in FIG Power supply lines 2 (here flexible cables) for the X / Y electrodes up to the middle of the Plasma screen 3 are performed on the back. By means of separate Plug connections are connected to driver stages 6, 7 there.

In order to further shorten the current paths, it makes sense to use the driver stages 6, 7 on one unite common circuit board. This can be seen in Figure 3. This is the radiation electromagnetic waves due to transfer currents between the driver stages 6, 7 decreased. Furthermore, the current leads 2 for the X / Y electrodes can now can be connected to driver stages 6, 7 via a common connector. At the same time, the two driver stages 6, 7 can use common buffer capacitors 1 use, which saves half of the capacitors.

A further improvement is possible in that the circuit 4 for selecting the No longer line up on the flexible lines of the power supply lines 2, but directly the rear wall 11 of the plasma screen 3 are mounted. The power supplies 2 between Y electrodes and the circuit 4 for selecting the rows and its Connection to the X / Y driver stages 6, 7 can then be made by a conductive layer on the rear wall 11 of the plasma screen 3 as in Figure 4b; Figure 4a shows the conventional supply lines 2. The connection of the plasma screen 3 to the driver stages 6, 7 is inexpensive due to connectors and contact springs or other conductive flexible materials possible, the direct contact with the conductive layer of the Have power leads 2. In addition to reducing the radiation area, such offers Arrangement still has the advantage of increased magnetic coupling, which the Current distribution of the return flows improved.

Looking at the radiation area of the entire arrangement from the glass sheet 10 of the Front of the plasma screen 3, it will be minimal if the contact area extends over the entire vertical center line of the plasma screen 3. The streams are then not concentrated towards the contact points. To do this, the power supply leads 2 each individual X electrode and each individual Y electrode on the front Glass pane 10 separated rearwards onto the outside of the rear glass pane 11 of the Plasma screen 3 and continue to about the middle, where they with the electronic Circuits (driver stages) 4, 6, 7 can be contacted. This is done in the same way with a narrow contact area 14 over the entire width as in the embodiment according to Claim 1, shown in Figure 6. The stage 4 for controlling the rows can also housed together with the X / Y driver stages 6, 7 on a common circuit board his. This embodiment can be seen in Figure 5.

Instead of the front glass pane 10, a transparent plastic pane can of course also be used or foil can be used if the stability of the entire plasma screen 3 is ensured.

Claims (5)

Arrangement with a plasma screen (3), which is between the viewer facing translucent disc (10) and a rear wall (11) cells for generating pixels and which in the areas (13) opposite outer edges of the rear wall (11) for contacting the cells has electrical contacts, which by means of largely parallel Power supply lines (2) with on the outside of the rear facing away from the cells Wall (11) arranged electronic circuits (4, 6, 7) of the type that are connected the current leads (2) terminate in an electrically separated manner in a narrow contact area (14), where an electrical contact between the power supply lines (2) on the one hand and the electrical circuits (4, 6, 7) is produced on the other hand. Arrangement according to claim 1,
characterized in that the current leads (2) are designed in the form of conductor tracks applied to the outside of the rear wall (11) facing away from the cells. Arrangement according to claim 1,
characterized in that the power supply lines (2) are in the form of cables. Arrangement with a plasma screen (3), which is between the viewer facing translucent disc (10) and a rear wall (11) Cells for generating pixels and on the outside facing away from the cells the rear wall (11) arranged electronic circuits for the control of X electrodes (6), of Y electrodes (7) and of the rows (4) which directly on the surface of the outer side of the rear wall (11) of the plasma screen (3) are attached and common Buffer capacitors (1) for the electronic circuits for controlling X electrodes (6) and Y electrodes (7). Arrangement according to claim 1 or 4,
characterized in that this arrangement is a television or monitor.

Images