Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2001-08-31
2003-12-16
Baumeister, B. William (Department: 2815)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S061000, C349S065000, C349S150000, C362S026000
Reexamination Certificate
active
06665038
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device, which is applicable to either a back light type or a front light type.
2. Description of the Related Art
Generally, depending on the illumination method used to illuminate a liquid crystal panel with a light, two types of liquid crystal display devices, a back light type and a front light type, are known. The structure of a back light type liquid crystal display is, as shown in
FIG. 6
, such that a back light liquid crystal and board unit
30
, made by stacking a circuit board
31
equipped with LEDs
36
, a back light transmission plate
32
located to contact with the LEDs
36
, and a liquid crystal panel
34
successively from the bottom, and is supported in a device box which is not shown in the figure.
On the other hand, the structure of a front light type liquid crystal display is, as shown in
FIG. 7
, such that a front light liquid crystal and board unit
20
, made by stacking a circuit board
41
, a liquid crystal panel
44
, and a joint body of a front light transmission plate
42
and a rod-like light transmission body
43
successively from bottom, and in which the LEDs
46
connected to a lead wire
47
are positioned facing the rod-like light transmission body
43
, and is supported in a device box which is not shown in the figure.
However, because the back light type and the front light type have completely different structures, the outer dimensions of the liquid crystal display device cannot be made common. To be more precise, the above conventional back light type liquid crystal display device is thicker because it has the LEDs and other components on a circuit board located under the transmission plate. On the other hand, the above conventional front light type liquid crystal display device needs additional wiring to supply power to the LEDs and other components because the LEDs are located to contact with the rod-like light transmission body and the transmission plate which is placed at the top.
Therefore, the outer dimensions of the conventional liquid crystal display device of a back light type and a front light type cannot be made common, and there is a problem of limitations in the design and the manufacturing steps. For example, when the device is designed and manufactured to fit either one of the types, even though it can be manufactured with a small size, it may have to be made larger to fit the other type, or additional supporting parts may be required to install the device in the device box. It is not efficient to manufacture such device.
SUMMARY OF THE INVENTION
The present invention exemplifies the above, and an object of the present invention is to provide a liquid crystal display device, which is applicable to either a back light type or a front light type.
In order to achieve the above object, the present invention provides a liquid crystal display device, characterized by comprising:
a liquid crystal panel having a display screen for displaying information by changing the intensity of a transmitted light, which takes place when the molecular sequence of a liquid crystal injected between two glass plates is changed by an applied voltage;
a back light transmission plate or a front light transmission plate that transmits a light, which illuminates the liquid crystal panel;
a board that applies voltage to the liquid crystal panel and has various wiring patterns;
a spur that projects from the board as a single unit and has various wiring patterns; and
a luminous body that is connected to a fitting wire on the spur,
and characterized in that a unit made by piling up a board, a back light transmission plate, and a liquid crystal panel successively from bottom, or a unit made by piling a board, a liquid crystal panel, and a front light transmission plate successively from bottom is assembled and then the spur is bent and maintained at a position where a light is transmitted from the luminous body to the back light transmission plate or the front light transmission plate.
Therefore by stacking the board, the back light transmission plate, and the liquid crystal panel successively from the bottom, bending the spur, and then locating the luminous body at a position where light is transmitted to the back light transmission plate, a back light unit can be assembled. On the other hand, by stacking the board, the liquid crystal panel, and the front light transmission plate successively from the bottom, bending the spur, and then locating the luminous body at a position where light is transmitted to the front light transmission plate, a front light unit can be assembled.
Moreover, the liquid crystal display in the present invention has an assisted light transmission body, which transmits a light and is connected to the back light transmission plate or the front light transmission plate. It is preferable to have the spur bent and maintained at a position where the assisted light transmission body and the luminous body are facing each other in order to transmit a light from the luminous body to the assisted light transmission body.
Therefore, by stacking the liquid crystal panel, the back light transmission plate, and the board successively from the top and beginning the spur to a position where the luminous body is facing the assisted light transmission body, a back light unit can be assembled. On the other hand, by stacking the front light transmission plate, the liquid crystal panel, and the board successively from the top and bending the spur to a position where the luminous body is facing the assisted light transmission body, a front light unit can be assembled.
Moreover, the board is a laminated body having a film-like substrate and a conductor such as a copper film to form wiring patterns. It is preferable to have the spur molded together with the board as one body. It is also acceptable for the board and the spur to be soldered together as one body. Moreover, it is preferable to have each unit built in a device box, which has the same planer dimension and thickness.
REFERENCES:
patent: 6384890 (2002-05-01), Takiar et al.
patent: 6414728 (2002-07-01), Faris et al.
patent: 6414781 (2002-07-01), Saitoh
patent: 6417897 (2002-07-01), Hashimoto
Adams & Wilks
Baumeister B. William
Richards N. Drew
Seiko Instruments Inc.
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