Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Reexamination Certificate
2000-09-18
2002-05-14
Ton, Toan (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
C349S058000, C349S061000
Reexamination Certificate
active
06388722
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device and more particularly to a liquid crystal display device with a reduced picture-frame area around the display area that does not contribute to the display.
To meet the growing demands for acquiring necessary information and performing computation anytime and anywhere, portable information processing devices as shown in
FIG. 52
have been developed. The portable information processing devices include notebook type personal computers (hereinafter referred to as a notebook computer), word processors, a portable information terminal, and a pocket type computer.
These portable information processing devices mostly use a liquid crystal display device due to its small thickness, lightness, and small power consumption.
The liquid crystal display device comprises a liquid crystal display panel for displaying an image and a drive circuit. The drive circuit is provided around the liquid crystal display panel and constitutes a non-display area (so-called picture-frame area) that does not contribute to the display.
There have been growing demands in recent years for increasing the display area in the portable information processing devices so that the display can be viewed easily. A simple way of increasing the display area is to use a large liquid crystal display device, but this degrades the portability, the very feature of the portable information processing devices.
Hence, certain picture-frame reduction techniques have been employed to reduce the non-display are and thereby increase the display area as compared with that of liquid crystal display devices with the same external size.
Such picture-frame reduction techniques are disclosed in Japanese Patent Application No. 75019/1994 and 297234/1995 and have been successful to some extent.
The inventors of this invention, however, have found that problems still remain to be solved in making the display area larger and the picture-frame area smaller than those of the conventional devices.
FIG. 53A
shows a case ML of the liquid crystal display device mounted with a backlight comprising a light guide plate GLB and a fluorescent tube LP.
FIG. 53B
is a cross section taken along the line B—B of FIG.
53
A.
FIG. 53C
is a cross section taken along the line C—C of FIG.
53
A.
The conventional liquid crystal display devices, as shown in FIG.
53
B and
FIG. 53C
, use lamp cables LPC
1
, LPC
2
with round cross sections for supplying a voltage to the fluorescent tube LP.
Hence, the area where the lamp cables LPC
1
, LPC
2
are installed in the liquid crystal display device becomes large, making it impossible to reduce the picture-frame area of the liquid crystal display device.
SUMMARY OF THE INVENTION
An object of this invention is to reduce the picture-frame area not contributing to the display on the liquid crystal display device.
To achieve the above object, the liquid crystal display device of the present invention comprises a liquid crystal display element, a backlight to provide light to the liquid crystal display element, and a case accommodating the liquid crystal display element and the backlight, wherein a lamp cable for supplying a voltage to the backlight is formed as a flat cable made of a conductive foil and an insulating film laminated together and is arranged between the backlight and the liquid crystal display element.
The liquid crystal display device of the present invention is characterized in that the device comprises a liquid crystal display element, a backlight to provide light to the liquid crystal display element, and a case accommodating the liquid crystal display element and the backlight, wherein a lamp cable for supplying a voltage to the backlight is formed of a flat cable made of a conductive foil and an insulating film laminated together, the backlight has a light emitting fluorescent tube and insulating bushings covering electrodes at the ends of the fluorescent tube, the lamp cable is connected to one of the electrodes of the fluorescent tube and is bent along the surface of the fluorescent tube, and the bushing covers that part of the lamp cable which is bent along the surface of the fluorescent tube.
The liquid crystal display device of the present invention is characterized in that the device comprises a liquid crystal display element, a backlight to provide light to the liquid crystal display element, and a case accommodating the liquid crystal display element and the backlight, wherein a lamp cable for supplying a voltage to the backlight is formed of a flat cable made of a conductive foil and an insulating film laminated together, the lamp cable has a terminal connected to an electrode of the fluorescent tube, the terminal of the lamp cable is connected to one of the electrodes of the fluorescent tube by soldering and the solder is exposed from the terminal of the lamp cable.
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Isono Tustomu
Iwamoto Ken-ichi
Suzuki Masahiko
Yamakawa Yuji
Yoshii Yoshiomi
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Qi Mike
Ton Toan
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