JPS62201493A - liquid crystal display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid crystal display device with reliable connection leads.

2. Description of the Related Art In addition to characteristics such as small size, thinness, and low power consumption, general liquid crystal display devices are becoming increasingly affordable, and their usage in the market is increasing. On the other hand, the shift to high-definition imaging is forcing the need for clearer, larger screens.

However, conventional liquid crystal display devices have a size limit in order to regulate the gap between two glass plates having transparent electrodes to a small degree of precision, and are generally configured with a combination of small screens. Furthermore, an elastic connector called zebra rubber is used to connect the glass plate and the drive circuit board, and a mechanical pressure contact mechanism is required in the configuration of a liquid crystal display device. Depending on the pressure contact method, the dimensions of the liquid crystal cell fixing frame Due to precision, surface condition, pressing pressure, etc., glass plates may crack, partially chip, or warp may occur due to uneven pressure, so the size is limited, and most of them are small.

An example of a conventional liquid crystal display device will be described below with reference to the drawings. FIG. 3 is a partial sectional view of a conventional liquid crystal display device, and FIG. 4 is a partial perspective view of the conventional liquid crystal display device.

Conventionally, this type of liquid crystal display device consists of two glass plates having transparent electrodes, a glass plate 1 having external lead electrodes and a glass plate having electrodes on the inner surface, as shown in FIGS. 3 and 4. 2 and 2 are arranged so that the transparent electrodes face each other with a slight gap, this gap is filled with liquid crystal 3, and the periphery is hermetically sealed with a sealing material 11. The flexible wiring board 6 which is pressure-welded to the external lead electrode part 10 of the glass plate 1 is connected to the circuit board 8 attached to the case 4 made of insulating material.
It is connected to by solder 7. This flexible wiring board 6 is placed between the insulating case 4 and the glass 1 via a rubber material 6, and is temporarily fixed by a metal frame 9 having a hook, and then pressed and pressed. Here, the press-contact portion of the flexible wiring board 6 is pre-formed into a predetermined size and shape, and the external lead electrode 1
The shape is suitable for small gaps in the structure.

Problems to be Solved by the Invention In a liquid crystal display device having such a conventional configuration, the liquid crystal cell and the insulating case 4 are fixed via the rubber material 6 by the clamping pressure of the metal frame 9 having hooks. The space between the liquid crystal cell and the metal frame 9 acts as a buffer material to prevent direct contact between the glass and metal, and also prevents dirt, water droplets, etc. attached to the surface from entering the interior, and maintains the original adhesive effect. Filled with silicone adhesive 12.13 having a but,
Fluctuations in the scissoring pressure of the metal frame 9, cracks that occur on the inner surface of the metal frame 9, and bending angles at some corners (particularly the rounded shape of the four corners have a large effect), as well as cracks that occur when cutting the glass plate 1. The surface is uneven due to the residue from the breakage, and depending on the pressure, it may crack or chip. Furthermore, the above-mentioned failures also occur due to external environmental factors such as heat cycles due to vibrations and impact heat, and humidity, and non-lighting due to broken glass poses a fatal problem for liquid crystal display devices.

The present invention is intended to solve these problems, and aims to prevent cracking and chipping of the corners of a liquid crystal cell.

Means for Solving the Problems In order to solve the above problems, in the liquid crystal display device of the present invention, the corners of the side edges of the liquid crystal cells connected to the flexible circuit board are chamfered.

Effects The present invention provides the following effects with the above-mentioned configuration. In other words, the liquid crystal cell placed on the inner surface of the metal frame with the hook has a gap of 0.1 between the metal frame and the metal frame due to its shark-like structure.
The accuracy is approximately 0.2fi. Therefore, if the liquid crystal cell is applied to the cracks that occur inside the metal frame, especially at the bent corners, cracks will occur. For this reason, by chamfering the four corners of the side end face of the liquid crystal cell to which the flexible circuit board is connected, such as the R-processed surface and C-processed surface within the range that does not shave the electrodes, it is necessary to force the inside of the metal frame. The liquid crystal cell and the metal frame now come into surface contact instead of the conventional near-point contact, and the cracks and chips that occur at the corners of the liquid crystal cell do not occur.

Furthermore, it becomes possible to increase the strength of the electrical connections, further improving the reliability of the electrical connections.

EXAMPLE Hereinafter, a liquid crystal display device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a partial sectional view showing the structure of a main part of a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a partial perspective view of the main part of the same liquid crystal display device.

In FIG. 1, 1 is a transparent external lead electrode part 1o (second
(see figure), the external lead electrode part 10
A flexible wiring board 6 is connected to the flexible wiring board 6, and the other end is connected to the drive circuit board 8 via solder, for example. Further, four corner portions of the side end surface of the glass plate 1 to which the flexible wiring board 6 is connected are chamfered within a range that does not shave off the external lead electrode 10f, resulting in an R-processed surface or a C-processed surface. 14 is a chamfered portion. Reference numeral 2 denotes a glass plate 2 having a transparent electrode on the inner surface of the glass.The transparent electrode is arranged to face the glass plate 1 with a slight gap, and this gap is filled with liquid crystal 3, and the surrounding area is surrounded by a sealing material 11. Hermetically sealed and fixed. 4 is a case made of an insulating material, and a glass plate 1 is connected to the flexible wiring board 6.
, 2 are held down by a hook-shaped metal frame 9 via a rubber material 5.

This rubber material 6 is a key point in configuring the pressure welding mechanism of the electrical connection part, and improves the reliability of the connection part and adapts to the clamping pressure of the metal frame 9 and presses the connection part with a pressure of about 1 okqZα. ing. 13 is a silicone adhesive, and the metal frame 9
In addition to being used for adhesion between the glass plate 1 and the glass plate 1, it also serves as a cushioning material to prevent direct contact between metal and glass materials, and to prevent dust (especially metal) and water droplets adhering to the surface from entering the interior. has been done.

The liquid crystal display device configured as described above has an external lead electrode 1o, and R-processed surfaces provided at four locations at each corner of the side end surface of the glass plate 1 to which the flexible wiring board 6 is connected.
Alternatively, due to the chamfered portion 14 of the C-processed surface, there is no point connection with the glass at the inner corners of the metal frame 9, particularly at some of the four corners. As a result, the glass plate does not crack or chip even when exposed to heat, vibration, impact, external environment, etc. (heat cycle, temperature, etc.).

Effects of the Invention As described above, the present invention provides a curved surface or a C-processed surface at each corner of the side end surface of the liquid crystal cell connected to the flexible circuit board, thereby improving the casing between the liquid crystal cell and the frame. In terms of reliability, there were no cracks or partial chips in the liquid crystal cell, and the quality and reliability, including workability, were significantly improved.
Industrial value is a dog.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a partial perspective view of the liquid crystal display device, and FIG.
The figure is a partial sectional view of a conventional liquid crystal display device, and FIG. 4 is a partial perspective view of the same liquid crystal display device. 1.2...Glass plate, 3...Liquid crystal, 6
...Flexible wiring board, 1o... External lead electric sign, 14... Chamfered portion. Name of agent: Patent attorney Toshio Nakao

Claims (1)

[Claims] The liquid crystal cell has an external lead electrode, and a flexible circuit board for connecting the liquid crystal cell to a drive circuit, and the external lead electrode and the flexible circuit board are electrically connected to each other, and the flexible circuit board is electrically connected to the flexible circuit board. A liquid crystal display device, characterized in that a corner of a side end face of the liquid crystal cell connected to a flexible circuit board is chamfered.