JPS6152629A - Electrode terminal fetch structure of plane type display panel - Google Patents

Abstract

PURPOSE:To realize a production of a low cost by using a high purity silicone resin of an ultraviolet hardening type or a room temperature hardening type of corrosion resistance, for an electrode fetching terminal part. CONSTITUTION:An envelope of a display panel is constituted of a glass substrate 1 and a back glass plate 2, and this inside is filled with a thin film EL element 3. As for this element 3, a matrix electrode structure is formed in the display side and the back side, and by applying selectively an AC voltage, an EL light emission is made to occur at a picture element unit of a dot matrix, and a light emission display is executed through the substrate 1. A display electrode for constituting a matrix electrode is arrayed on the substrate 1, and this display electrode is extended and provided to the outside of the envelope and connected to an electrode fetching terminal 4 consisting of a two layer structure of an Al film and an Ni film formed continuously to the peripheral edge part of the substrate 1. To the terminal 4, an FPC (flexible printed circuit board) 5 is connected by solder 6, and the upper face of the substrate 1 is covered with a silicone resin 7 of a high purity. As for the resin 7, a prescribed quantity is applied, and it is hardened by irradiating an ultraviolet ray. In such a way, the production can be executed at a low cost.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a structure for taking out electrode terminals in a display panel, and is a technique that is particularly effective for flat display panels that require multi-terminal takeout such as matrix electrode structures. .

<Prior art> Flat display panels such as thin-film EL panels, liquid crystal display panels, and plasma display panels generally have a large number of terminals for taking out electrodes at a fine pitch around the panel substrate. It is connected to an FPC (flexible printed circuit board) formed by patterning @ foil or the like on a connecting pin or a polyimide film by adhesion using a conductive paste, an anisotropic conductive sheet, etc., or pressure bonding using a conductive elastomer.

That is, in order to respond quickly to the diversification of information, the display electrodes of these flat display panels are generally configured with an X-Y matrix electrode structure, and a dot matrix type display is performed. @ Therefore, in order to clearly display a large amount of information, I! It is necessary to arrange the number of #7 electrode lines at a high density, and the number of terminals for taking out the electrodes will inevitably increase.

However, when using pins to take out terminals, it becomes difficult to manufacture the pins when the arrangement pitch of the terminals for taking out the electrodes becomes fine, and the strength of the pin itself becomes weak. Also, when using conductive elastomer for crimping, the number of terminals for taking out the electrodes increases. In this case, a large pressure force is required and it is necessary to make the pressure force uniform, resulting in an increase in the size of the pressure mechanism, which poses problems in manufacturing. Therefore, when taking out a large number of terminals at a fine pitch, F
Methods that are widely used include fusion bonding of PC and solder, etc., or adhesive bonding in combination with resin materials such as conductive paste and anisotropic conductive sheets. A common problem with these connection methods is that the Corrosion occurs because the terminal for taking out the electrode is a thin film or thick film, and electrolytic corrosion occurs because the material is different from the wiring material of the flexible wiring board or the metal material used to obtain electrical connection. In other words, when these connection systems are used in applications that require high reliability over a long period of time, it is necessary to provide some kind of protection.

However, there was no conventional resin that met this purpose, and a patent application
8-1774761 Electrode terminal extraction structure for a flat display panel, we proposed an electrode terminal extraction structure in which a flat display panel and a protective plate having a similar coefficient of thermal expansion are fixed.

FIG. 2 shows a sectional view of the electrode terminal extraction structure. In the figure, 11 is a glass substrate, 12 is a rear glass plate, 1
3 is a thin film EL element, 14 is a terminal, 1541 FPC (flexible printed circuit board), 16 is solder, 17 is resin, and 18 is a protective glass plate.

However, in this structure, the work becomes complicated and automation is difficult, and the material cost of the protective plate increases, resulting in a cost increase. By using a high-purity, ultraviolet-curable silicone resin as the moisture-resistant protective resin coated on the parts, and a high-purity, non-corrosive, room-temperature-curable silicone resin, stress problems can be avoided and It is an object of the present invention to provide a new and useful electrode terminal extraction structure for a 1,000-inch display panel that can prevent electrolytic corrosion occurring between dissimilar metals even when a resin absorbs moisture.

Embodiment 2 FIG. 1 is a diagram showing a main part of an electrode terminal extraction structure of a thin film EL display panel showing an embodiment of the present invention.

The glass substrate 1 and the back glass plate 2 constitute an envelope of the display panel, and a thin film EL element 3 is sealed inside the envelope.The thin film EL element is separated on the display side and the back side. is formed, and by selectively applying an alternating current voltage, EL light is generated in units of dot-to-matrix pixels, and a light-emitting display is performed through the glass substrate l. Display electrodes constituting the matrix electrode are arranged on the glass substrate 1, and the display electrodes extend outward from the envelope and are continuously formed to the peripheral edge of the glass substrate 1. Membrane and Ni
It is connected to an electrode extraction terminal 4 made of a two-layer membrane structure. An FPC 5 is connected to the terminal 4 by solder 6, and the upper surface of the glass substrate 1 including this connection portion is coated with a high-purity silicone resin 7.

A predetermined amount of silicone resin 7 is applied using a dispenser and cured by irradiation with ultraviolet rays. The curing method may be a room temperature curing treatment, or is limited to a deacetonization type from the viewpoint of corrosivity to metals and curing time.

Thin film EL display panels having the structure shown in Fig. 1 (present invention) and the structure shown in Fig. 2 (conventional) were created, and
Table 1 below shows the results of a humidity test conducted by leaving the sample in an H atmosphere.

(Data value is defective occurrence rate C%)] Forms No. 3 and 4 in Table 1 are based on this example, and from the table above, according to this example, the form in Figure 1 which does not have a retaining board is It is recognized that the protective structure is also an extremely excellent moisture-resistant protective structure similar to that of the protective structure No. 5.6 shown in Figure 2.

In addition, in other reliability tests, as shown in Table 2 below,
The results showed that there were no problems at all.

Note that although the above embodiments have been described with respect to thin film EL display panels, the present invention can also be applied to other flat display panels such as liquid crystal display panels and plasma display panels.

<Effects of the Invention> As explained in detail above, according to the present invention, it is possible to obtain the same effect against corrosion of the electrode lead-out terminal as the protective structure shown in FIG. This makes it possible to produce display panels.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the main part of an electrode terminal extraction structure of a thin film EL display panel showing one embodiment of the present invention. FIG. 2 is a configuration diagram of an electrode terminal extraction portion in a conventional thin film EL display panel. Explanation of symbols l...Glass substrate, 2...Back glass plate, 3.
...Thin film EL element, 4...Terminal, 5...FPC
16...Solder, 7...Resin. Agent Patent attorney Aihiko Fukushi (and 2 others) Figure 1 Yasu 2■

Claims (1)

[Claims] 1. In a flat display panel in which terminals connected to display driving electrodes are arranged around the substrate, a flexible wiring board is connected to the terminals, and a flexible wiring board is connected to the terminals, and the terminals connected to the display driving electrodes are arranged around the substrate. An electrode terminal extraction structure filled with resin, wherein the resin is an ultraviolet curing type or a non-corrosive room temperature curing high purity silicone resin. structure.