JPH071356B2 - Liquid crystal display integrated assembly - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to an integration of a matrix address type liquid crystal display that can be used as a display in an information processing device such as a computer or a terminal device such as a printer or a word processor. The object of the present invention is to integrate these plate bodies reliably and efficiently, especially for centering and electrical contact of the terminal electrodes of a large-sized liquid crystal display board having a large number of dots with a narrow pitch interval.

"Prior Art" As a prior art for mounting a liquid crystal display board on a printed circuit board, for example, an insertion hole for the liquid crystal board is provided in the printed circuit board so that the terminals of the liquid crystal board are located on substantially the same plane as the terminals of the printed circuit board. It has already been proposed that they be inserted and mechanically fixed by an adhesive filled between these mutually facing wall surfaces, and that individual terminals of the liquid crystal plate and corresponding terminals of the printed circuit board be electrically connected by a conductive adhesive. Has been done. Conventionally, a 9-inch CRT in which a matrix of 640 in the longitudinal direction (X direction) and 200 in the Y direction is patterned is conventionally used.
Corresponding to the above-mentioned terminal of 0.3 to 0.4 mm pitch to electrically connect one surface of two glass plate bodies holding the liquid crystal and the terminal arranged on the printed circuit board to a considerable wide area liquid crystal plate A thin rubber contact plate formed by connecting conductors with an insulating rubber is inserted to fix a liquid crystal plate serving as a display unit on the printed circuit board. However, since the electrode interval, that is, the pitch is extremely narrow and the above-mentioned rubber contact plate is pressure-contacted with each other to maintain electrical contact, the above-mentioned rubber contact plate is fixed depending on the superposition state of the printed circuit board and the liquid crystal display plate and the fixing method. Does not always maintain equal pressure, and locally causes poor contact to increase contact resistance, or when the applied pressure is increased, the rubber stretches in the surface direction and the segment terminals and conductors are displaced, causing There is a problem such as contact failure and deterioration over time.In addition, when used in a structure that undulates and opens and closes the display plate, even a slight mechanical impact in the direction of the display surface may cause the rubber contact plate to be displaced. There are drawbacks that cause it.

Furthermore, when it is attempted to be soldered after being integrated with a liquid crystal display board by using a double-sided printed circuit board, it is exposed to high heat of 250 ° C or more and the printed circuit board and other stacks undergo thermal deformation, causing shrinkage. It sometimes contains difficulties such as the position of the initially aligned pattern itself being misaligned.

[Problems to be Solved by the Invention] As described above, according to the present invention, the alignment of the segment electrodes having a narrow pitch in the X direction between the electrode glass plate body and the liquid crystal display plate is performed during manufacturing as the target at the time of design and As the assembly of the liquid crystal display body, the materials used in the past were used in terms of heat, processing, and durability so that the alignment would be easy and the liquid crystal display body would be highly reliable without being out of order during use as a device. , In order to improve the display quality by improving the configuration method.

"Means for solving the problems" Then, the rubber contact plate which has been used before is thermally,
In view of mechanical conditions, a glass plate having a substantially same expansion coefficient as that of the liquid crystal display plate is used to replace the segment electrode with the liquid crystal glass plate member easily and surely, and to fix it integrally. It is intended that the segment driving circuit element can be mounted on the glass plate and the common terminal electrode driving element can be mounted on the printed board.

[Example] In Fig. (I), a common terminal electrode is formed on one side and a cable connection terminal (T _B ) is formed on the opposite side, and a liquid crystal drive signal and a power supply terminal (T _D ) are provided and a common terminal electrode drive element is provided. A printed circuit board (I) having an area (Q) for mounting
(II) 2 in the figure is the segment terminal electrode (T _S ) and the segment electrode driving element mounting area (P) in the X direction (longitudinal direction).
And a cable connection terminal (T _B ′) formed on the opposite side of the segment terminal electrode. Figure (II
The liquid crystal (4) is sandwiched between the upper glass plate (5) and the lower glass plate (3) to form a segment electrode (T _S ′) in the Y direction and a common electrode (T _C ′) in the Y direction. It is a liquid crystal glass plate.

Fig. IV shows the printed circuit board and the upper surface of the liquid crystal connected to the printed circuit board (1) via the cable (6) with the integrated body in which the electrode glass plate bodies (2) are stacked on the liquid crystal glass plate bodies (3) and (5). Is a side view of a pattern in which the common terminal electrodes (T _C ) and (T _C ′) of the lath plate are connected to each other with the sealing material (7).

Needless to say, the matrix-shaped transparent electrodes (not shown) are provided along the contact surface with the lower surface glass plate on which the liquid crystal is sandwiched, the printed circuit board, the electrode glass plate body, the upper, The lower glass plate is integrally and firmly fixed by pressure at its outer peripheral end by a frame (not shown).

Since the common electrode formed on the upper surface Y of the lower surface glass of the liquid crystal glass plate as described above has a pitch between terminals of about 0.8 mm, it is connected to the common electrode of the printed circuit board by a thermocompression bonding method using a heat seal material. The segment electrodes of the glass plate and the lower glass plate of the liquid crystal glass plate are individually connected by the wire bonding method. The segment driving circuit element is fixed to the upper surface mounting area (P) of the electrode glass plate.

"Effects" The glass plate as a liquid crystal display of this kind has expansion and contraction of ± 50 microns due to temperature changes, but the segment electrode having a dense pitch is replaced by a conventional rubber contact plate, and Since such an electrode glass plate is inserted between the liquid crystal glass plate and the printed circuit board, the expansion and contraction due to the heat of the substrate material is almost the same, and the alignment between the electrode glass plate and the printed circuit board is achieved. Can be performed accurately, efficiently, and easily, and moreover, the liquid crystal glass plate is surely brought into contact with the electrode glass plate. Of course, since thermal deformation when exposed to high heat can be ignored, there is no positional displacement between the electrode patterns and a reliable contact conduction state can be obtained, so that the reliability and display quality of the entire device can be improved.

In addition, since the LSI for driving the segment can be mounted on the electrode glass plate, strong contact conduction can be obtained in the closest position of the liquid crystal display, and the output of the driving circuit element due to the capacitor action of the liquid crystal itself and the circuit time constant. It also contributes to eliminating the distortion of the waveform.

[Brief description of drawings]

Figure (I) is a printed circuit board, (II) is an electrode glass plate,
(III) is a liquid crystal glass plate body composed of a liquid crystal upper surface glass plate and a lower surface glass plate, and FIG. IV is a side view of these integrated bodies. 1: Printed circuit board, 2: Electrode glass plate, 3: Bottom glass plate,
4: Liquid crystal, 5: Top glass plate, T _S , T _S ′: Segment electrode,
T _C , T _C ′: Common electrode, P: Segment drive circuit element mounting area, Q: Common electrode drive circuit element mounting area

Claims (1)

[Claims] 1. A print in which a common electrode terminal T _C is formed on one side and a cable connection terminal T _B is formed on the other side, and a liquid crystal driving signal terminal and a power source terminal are provided and a common electrode driving circuit element Q is mounted. The liquid crystal 4 is sandwiched between the substrate 1 and the dot-matrix transparent electrode, and the segment terminal electrodes T _S ′ are arranged on opposite sides in the X direction, and the common terminal electrode is arranged in the Y direction.
A liquid crystal glass plate body (3 + 4 + 5) each having T _C ′ formed,
The segment terminal electrode driving element P is placed on the back surface of the liquid crystal glass plate (3 + 4 + 5), and X
The electrode glass plate 2 has a segment electrode T _S on one side in the direction and terminals connected to the cable 6 on the other side, and has an expansion coefficient substantially equal to that of the liquid crystal glass plate (3 + 4 + 5). Bonding the segment terminal electrodes T _S ′ of the liquid crystal glass plate (3 + 4 + 5) and the electrode glass plate 2, and the common terminal electrode T _C ′ of the printed circuit board 1 and the liquid crystal glass plate (3 + 4 + 5). 2. An integrated assembly of liquid crystal display bodies, characterized in that the peripheral edges of the stacking plate body are integrally assembled and fixed to each other by means of electrical connection.