JPH0542633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inspection device for an electronic device such as a liquid crystal display, and in particular for a holding part of a liquid crystal display and a contact part between an electrode terminal of a liquid crystal display and an input terminal for an external electrical signal. It is an invention.

In recent years, the density of electronic devices has increased, and liquid crystal displays are no exception. Along with this, liquid crystal displays and the like initially had only a few dozen input terminals for external electrical signals in the case of numeric displays, but as the contents of the display tended to become graphical, the number increased to several hundred. It's coming. Therefore, the width occupied by the electrode terminal is approximately 100 μm, which is about the same as that of a pad in a semiconductor chip.

A conventional inspection device for a liquid crystal display when the number of electrical terminals is approximately several dozen is explained with reference to FIG. It is set on a jig plate 4 having a A probe 3 is installed on the jig plate 4 at a position corresponding to an electrode terminal for inputting an electric signal for driving a liquid crystal display, and a probe pin 3B moves up and down under pressure.

The socket 3A of the probe 3 has a diameter of 2 mm, and the probe pin has a diameter of about 1.5 mm. The liquid crystal display is
The area where the display part can be seen is pressed by the hollowed-out frame plate 5, and the electrode terminal and probe pin 3B
contacts, allowing external electrical signals to be input into the liquid crystal display.

Inspection of a liquid crystal display using such probe pins having a diameter of 2 mm is limited to an electrode terminal pitch of approximately 5 mm.

As mentioned above, in the case of a high-density liquid crystal display, the probes 3 corresponding to the number of electrode terminals cannot be set in terms of area because the diameter of each probe pin is larger than the terminal width, and this effectively increases the density. It has been found that it is not possible to obtain contact with a liquid crystal display by using a probe. Apart from multiplex-driven liquid crystal displays, especially in the case of active matrix type liquid crystal displays in which thin film transistors are integrated at high density, the capacitance of the transistor portion varies depending on how the wiring is routed, so the inspection characteristics are as follows. It was considered advantageous to use the same pattern as the liquid crystal display and match the impedance.

The present invention has been made to eliminate such drawbacks. An embodiment of the present invention will be described with reference to FIGS. 2 and 3. Reference numeral 11 denotes a high-density liquid crystal display, in which two glass cells are filled with liquid crystal, and the liquid crystal display is placed on the surface of one glass. A large number of electrode terminals 18 are arranged around the outer periphery through which electrical signals necessary for driving are inputted. Reference numeral 12 denotes a flexible film to which, for example, copper foil or the like is fixed, and a conductive pattern is formed on the inner end of the flexible film by etching the copper foil or the like so as to correspond to the electrode terminals 18 . Conductive pattern 1
3 is formed with a convex portion 13 that conforms to the shape of the elastic body 15. The flexible film has been removed to facilitate its molding. Reference numeral 15 denotes an elastic body such as a rubber tube, and a concave groove 16 is formed in the jig plate 22, and the elastic body 15 is installed in this groove. A convex conductive pattern 13 is placed on the elastic body 15, and the apex of the convex portion comes into contact with the aforementioned electrode terminal 18. The inner end of the conductive pattern on the flexible film corresponds to the electrode terminal, so it has a fine pitch of, for example, 0.2 mm, but the outer end is
In order to serve as external electrical signal input terminals 14, a flexible film having a rough pitch, for example, 2.5 mm, is fixed to 22 with adhesive or the like. 23
indicates a holding portion for holding and fixing the liquid crystal display 11. It is made of electrically insulating material.
Although this is not shown in the figure, the X direction 19,
It is connected to a mechanism movable in the Y direction and the θ rotation direction 21. Alignment marks 17 are patterned on the liquid crystal display from the time of manufacture, and corresponding alignment marks 18 are formed diagonally on the jig plate 22. Using a microscope with epi-illumination, check the liquid crystal display and the alignment mark 17 on the jig plate.
The holder is moved in the X, Y, and θ directions so as to enlarge and match 18, and after matching, the holder is provided with a mechanism to move in the vertical direction 24 so that the electrode terminal 18 and the conductive pattern 13 are in contact with each other. Lower it. In this way, all the electrode terminals of the liquid crystal display come into contact with the conductive pattern, making it possible to drive the liquid crystal display with an external electric signal.

As described above, according to this embodiment, it is possible to input an external driving electric signal to the electrode terminals of a high-density liquid crystal display, and it is possible to inspect the performance of the liquid crystal display. The impedance on the circuit, which has the same pattern shape as the device built into the body, can be matched, and the display performance is equivalent to that of the device built into the body, making inspection and evaluation easy. In the detailed explanation of the present invention, a liquid crystal display is described as an electronic device, but other flat devices such as an electrochromic display, an electroluminescent panel, a PDP, etc. in which electrode terminals are arranged on the outer periphery are also included. The present invention is also applicable to a performance inspection machine for a panel display.

As described above, according to the present invention, since a flexible film in which a conductive pattern is formed to face the electrode terminals is used, it is possible to sufficiently cope with an increase in the density of the electrode terminals. Further, since the electrode terminal and the conductive pattern are in surface contact, a more reliable and stable electrical connection can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows contact obtained by a conventional probe;
The schematic diagram of the holding part of the liquid crystal display of the inspection machine which inspects a liquid crystal display is shown. FIG. 2 is a schematic diagram corresponding to FIG. 1 showing the method of contact in the present invention,
FIG. 3 is a schematic diagram showing its configuration. DESCRIPTION OF SYMBOLS 1...Liquid crystal display, 2...Polarizing plate, 3...Probe, 3A...Socket, 3B...Probe pin, 4...Jig plate, 5...Frame plate, 11...Liquid crystal display, 12 ... Flexible film, 13 ... Conductive pattern at inner end, 14 ... Conductive pattern at outer end, 1
5...Elastic body, 16...Groove portion, 17...Alignment mark, 18...Electrode terminal, 22...Jig part, 23
...Retaining part, 25... Alignment mark.

Claims (1)

[Claims] 1 A flat panel with a plurality of electrode terminals arranged on at least one edge of the outer periphery, a conductive pattern formed on the surface, and a film base material of the conductive pattern portion facing the electrode terminal is cut away. a flexible film, an elastic body disposed below the conductive pattern facing the electrode terminal, a jig member on which the elastic material and the flexible film are disposed, and a jig member having the flat plate shape. An inspection apparatus for an electronic device, comprising at least a holding means for holding a panel and pressing the electrode terminal and the conductive pattern into contact with each other.