JPS61177481A - Sealing construction of liquid crystal display unit - 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] [Industrial Application Field] The present invention provides a sealing structure for peripheral circuits in a liquid crystal display device having peripheral circuits constructed using thin film conductor elements on the same substrate around a display area. Regarding.

[Summary of the invention]

In a liquid crystal display device having a peripheral circuit on the same substrate as a substrate on which pixels are formed, the present invention improves the molding process of the peripheral circuit by simultaneously sealing the peripheral circuit using a process tube for sealing the liquid crystal tube. It's something that can be reduced.

[Conventional technology]

Conventionally, as shown in FIG. 2, when sealing a peripheral circuit 2 driving a display area 1t, a molding agent 7t used in general integrated circuits has been used.

[Problem that the invention seeks to solve]

However, conventional molding agents are not suitable for liquid crystal display devices! The tightness on the large quartz glass substrate used in this is To4! There was a problem with reliability because the performance was not good. In addition, with conventional molding agents, it is difficult to form the molding agent into an accurate shape, and there is a risk of molding into unnecessary areas.
Nineteen. Furthermore, when using a molding agent, the temperature of the substrate is 150°C.
Since the above heating is necessary, when the peripheral circuit is formed of α-B (thin film transistors), the electrical characteristics may be completely deteriorated.

In this invention, in order to solve these conventional drawbacks, we have discontinued the use of a tube molding agent for sealing the peripheral circuit, and have created a sealing method that is more reliable and uses a simpler process. The purpose is to provide a sealing structure that can

[Problem t-Dangerous means of making a final decision]

In order to solve the above problems, the present invention prevents the peripheral circuit from being sealed using a molding agent, and provides a structure in which the peripheral circuit can be sealed using the same process as the display area.

[Effect]

Liquid crystal display devices with the above-mentioned structure are sealed, and because the thermal process is reduced, α-6, which is used in peripheral circuits
(Deterioration of electrical characteristics of thin film transistors can be reduced.
Furthermore, since the shape of the sealing region is highly precise, it is possible to configure a liquid crystal display device with a higher degree of integration than in the past. Therefore, the substrate area is reduced, and the manufacturing cost of the liquid crystal display device is reduced. Furthermore, while eliminating the molding agent sealing process, there is no additional 27 ot line of new process, which reduces the manufacturing cost of the liquid crystal display device.
Decrease.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings. In FIG. 41, a display area 1 and a peripheral circuit 2 including a drive circuit, a sample-and-hold circuit, a shift register circuit, and the like are formed on a lower substrate 8 using a semiconductor process.

The sealant 4 is formed around the display section 1 to seal the liquid crystal, and is also formed to completely surround the peripheral circuit 2 to seal the peripheral circuit. The electrode 5 of the peripheral circuit 2 is drawn out to the outside of the sealant 4 and the upper substrate 6. The lower substrate 8 and the upper substrate 6 are bonded to each other through the sealant 4, thereby completely sealing the peripheral circuit 2 from the outside and the display area 1. By the way, at least one of the lower substrate 8 and the upper substrate 6 is a transparent substrate.

In the embodiments described above, when the peripheral circuit is sealed using a sealing agent, the sealing process for the display area can be performed at the same time, so the number of steps can be reduced compared to a process using a conventional molding agent. Furthermore, since the sealant has good gIMN properties, the reliability of sealing the peripheral circuit is improved.

〔Effect of the invention〕

As explained above, the present invention uses a structure of a sealant that enables sealing of peripheral circuits using the sealing process of the display area, thereby reducing the number of process steps and increasing the integration of liquid crystal display devices. This has the effect of reducing temperature, preventing deterioration of electrical characteristics of peripheral circuits, and improving sealing reliability.

[Brief explanation of drawings]

FIG. 1 is a plan view of a liquid crystal display device according to the present invention, and FIG. 2 is a plan view of a conventional liquid crystal display device. 100. Display area 40. Sealant 2000 peripheral circuit 50. Electrode 800. Lower board 60. Upper board Figure z above

Claims (1)

[Claims] In a liquid crystal display device having a peripheral circuit composed of thin film transistors on the same lower substrate between the display areas, a sealing agent similar to that of the display part is applied around the peripheral circuit, and the display The structure is such that the peripheral circuit is sealed in a region completely sealed by the upper substrate, the sealant, and the lower substrate by bonding the upper substrate to the lower substrate at the same time as the region. Sealing structure of liquid crystal display device.