Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1996-10-16
1998-04-28
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349149, 349151, G02F 11333, G02F 11345
Patent
active
057452024
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a liquid-crystal display device employed in a liquid-crystal television, liquid-crystal monitor, liquid-crystal projector, or the like. More particularly, this invention is concerned with a liquid-crystal display device in which it is prevented that ICs serving as drive circuits for driving the liquid-crystal display device malfunction due to light.
BACKGROUND ART
In recent years, liquid-crystal display devices have been employed in many fields such as the fields of televisions, clocks, and portable telephones. In general, a system for driving a liquid-crystal display device includes a static driving system in which all segment electrodes are driven mutually independently and a multiplex driving system in which all segment electrodes are divided into a plurality of groups and driven in time-sharing. In either of the driving systems, drive circuits are provided in the form of ICs and located very close to the liquid-crystal display device. The drive circuit is, in principle, composed of selection circuits for selecting columns and rows of elements set in array in the form of a matrix, a scanning circuit for scanning these elements, and a holding circuit for temporarily storing data. These circuits are provided in the form of ICs in an effort to design them more compactly. However, as a circuit is getting finer, it becomes more susceptible to light.
By the way, inevitable light emanating from the liquid- crystal display device, that is, light traveling inside the display device itself and light emanating from a backlight fall on the drive circuit.
However, since the liquid-crystal display device is, as mentioned above, employed in quite a few fields, it may pose a problem in practice. For example, when a strobe of a camera is flashed immediately above the liquid-crystal display device or an IC serving as a drive circuit is actuated under a light or under sunlight, a problem occurs. This kind of situation is encountered daily. Measures therefore must be taken for fear the liquid-crystal display device should malfunction because of extraneous light.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a liquid-crystal display device in which it is prevented that ICs serving as drive circuits and lying very close to the liquid-crystal display device malfunction because of extraneous light or internal traveling light, and thus display quality is improved.
According to the present invention, a liquid-crystal display device, in which at least two transparent glass substrates each having transparent electrodes formed thereon are arranged so that the transparent electrodes formed on the substrates are opposed to each other with a space between them, a liquid crystal is injected into the space, a seal is fitted into the space for fear the liquid crystal should leak out, and ICs for driving the liquid crystal are placed on the substrates outside the seal, is characterized in that a first light interceptive member having a light absorptive member for absorbing light is placed on the transparent substrates below the ICs.
A preferred embodiment is characterized in that a second light interceptive member having a light reflective member for reflecting light as one side thereof and having a light absorptive member for absorbing light as the other side thereof is placed on the transparent glass substrates below the ICs.
In another preferred embodiment, a light absorptive member is made of black nonwoven fabric or black polyester cloth. Moreover, a viscous material is coated over the face of the light absorptive member.
Furthermore, the viscous material is a rubber material, silicon material, or resin material. Moreover, a light reflective member is made of aluminum foil.
Yet another preferred embodiment further comprises a third light interceptive member for covering the ICs and their surroundings. The third light interceptive member is made of silicon resin or the same material as the first or second light interceptive member.
Furthermore, a fo
REFERENCES:
patent: 4643526 (1987-02-01), Watanabe et al.
patent: 5130832 (1992-07-01), Kawaguchi et al.
patent: 5574292 (1996-11-01), Takahashi et al.
Imai Yasuhiro
Yamauchi Masamichi
Citizen Watch Co. Ltd.
Sikes William L.
Ton Toan
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