Liquid crystal display device and a mobile information terminal including a liquid crystal display device

Abstract

The invention provides a liquid crystal display device of which the thickness reduction is realized while retaining a predetermined mechanical strength and the measures against noise production is taken, and also provide a portable information terminal using the same. In the liquid crystal display device 10 constructed by disposing a first liquid crystal display panel 15 on a surface of a light guide plate 11, which guides light to both front and rear faces, and a second liquid crystal display panel 30, which is more compact than the first liquid crystal display panel 15, on the other surface thereof, and laminating them, the liquid crystal display device has a circuit substrate 18, which controls the first and second liquid crystal display panels 15, 30 and has contact portions 22a, 22b for grounding on at least one out of the front and rear faces, interposed between the light guide plate 11 and the second liquid crystal display panel 30, wherein the contact portions 22a, 22b for grounding are in contact with metal members 25, 40 mounted on at least one out of the front and rear faces of the circuit substrate 18, and the portable information terminal uses the liquid crystal display device.

Description

Technical field [0001] The present invention relates to a liquid crystal display device that can be illuminated on both sides by a backlight unit and a portable information terminal having the liquid crystal display device. Background technique [0002] In recent years, mobile phones, PDAs, or portable information terminal devices that have telephone functions and can display more information have been commercialized and widely spread. Among these devices, especially mobile phones, in addition to the original telephone function for calls, they can also be connected to the Internet and have various functions, such as e-mail, information retrieval, or display of a map while performing destination guidance. Navigation and other functions can be loaded with a variety of software in the future, becoming indispensable things in daily life. [0003] Along with the loading of such a variety of software into the mobile phone, the phone itself, so-called hardware, is also required to be mo...

AI Technical Summary

Problems solved by technology

As a result, it becomes difficult to reduce the thickness of the liquid crystal display panel

[0019] In addition, since this double-sided liquid crystal display device does not take noise countermeasures, when it is used in a mobile phone or the like, there is a problem that noise countermeasures must be taken on the device (mobile phone) side.

[0020] In particular, mobile phones have a high frequency of transmission of vibrations into the device due to the fact that they move a lot, so it is difficult to obtain a reliable ground, so there is a problem that it is difficult to take noise countermeasures.

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