Liquid crystal cells – elements and systems – Particular structure – Holder – support – frame – or housing
Reexamination Certificate
1998-01-20
2001-03-13
Malinowski, Walter J. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Holder, support, frame, or housing
Reexamination Certificate
active
06201586
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display provided with a back light and, more particularly, to a supporting structure of a liquid crystal panel and a wiring structure for a light source of the back light.
2. Prior Arts
Generally, as shown in
FIG. 8
, an entire liquid crystal display comprises: a liquid crystal panel
50
in which a display material such as liquid crystal is held between two opposed substrates; a circuit board
51
which is disposed for driving the panel
50
; an edge type lighting device (back light)
53
which is disposed at the rear (on the backside) of the liquid crystal panel
50
through a plastic frame
52
; and an outer frame
54
covering these elements.
In the conventional liquid crystal display of above structure, for the purpose of supporting the liquid crystal panel
50
on the back light
53
, stoppers
56
are disposed at four corners
55
a
,
55
b
,
55
c
and
55
d
of the plastic frame
52
forming an integral one unit with the plastic frame
52
.
In the mentioned conventional liquid crystal display, a wiring section of the light source for the back light is arranged as described below. That is, as shown in
FIG. 9
a
(perspective view in which outer frame
107
is omitted for the sake of easy understanding) and
FIG. 9
b
(sectional view), the conventional liquid crystal display comprises: a light guide plate
101
having an illumination surface
1011
A which is formed of a plane light-transmitting member composed of a lens film or the like on a front face portion
1011
thereof and having a subref lector composed of a reflection film on a back face portion
1014
and on a side end face portion
1013
; a light source
103
which is disposed adjacent to a front end face portion
1012
of the mentioned light guide plate
101
and emits a light to be guided into the light guide plate
101
; a liquid crystal panel
102
which is disposed on the front side of the illumination surface
1011
A of the mentioned light guide plate
101
and controls the transmission of the light guided by the electric signal through the light guide plate
101
; a main reflector
104
which is attached to the front end face portion
1012
of the mentioned light guide plate
101
by surrounding the mentioned light source; and a wiring section
105
for supplying a power to the mentioned light source. In the wiring section, a low voltage side wiring
105
B was arranged insulatedly at the rear of the mentioned main reflector
104
. The mentioned elements were all accommodated in the outer frame
107
.
The light source
103
is lighted up by the power source supplied through the wiring section
105
, and the illumination surface
1011
A of the light guide plate
101
is illuminated with the light of the light source
103
from the rear of the liquid crystal panel
102
. On the liquid crystal panel
102
, the transmission of light at the portions corresponding to respective picture elements is controlled by electric signal, thereby depicting a required picture on the liquid crystal panel
102
, and accordingly, the picture depicted on the liquid crystal panel
102
may be seen from the front side. The control signal is supplied from outside to the liquid crystal display
102
through the circuit board
106
.
Since the conventional liquid crystal display is arranged as described above, in the aspect of supporting the liquid crystal panel, the stoppers
56
shown in
FIG. 8
are formed at the time of forming the plastic frame
52
, and at least 0.5 to 0.6 mm is required to secure a minimum thickness of the stoppers
56
. Accordingly, when end face of the stoppers
56
is put in contact with the back side of the lamp, longitudinal dimension of the liquid crystal display is increased, and when internal face of the stoppers
56
is put in contact with the side end face of the lamp, lateral dimension of the liquid crystal display is increased. Furthermore, a space (thickness) for disposing the stoppers must be secured also on the opposite side of the lamp, and therefore dimensions of the liquid crystal display are increased as much as the lamp side.
In the aspect of wiring of the light source of the back light, as shown in FIGS.
9
(
a
) and (
b
), since the insulated low voltage side wire
105
B is arranged at the rear of the main reflector
104
for the power supply to the light source, a large dead space is produced round the low voltage side wire
105
B, eventually resulting in the problem of large external dimensions of the entire liquid crystal display.
SUMMARY OF THE INVENTION
The present invention was made to solve the above-discussed problems and has an object of providing a liquid crystal display of which external dimensions are reduced by improving the supporting structure of the liquid crystal panel and the structure of the wiring section.
To accomplish the foregoing object, a liquid crystal display according to the invention comprises: a liquid crystal display panel; a circuit board for driving said liquid crystal panel; a plastic frame on which said liquid crystal panel is mounted; an edge type back light arranged on rear side of said liquid crystal panel; and an outer frame for covering the mentioned liquid crystal display panel, circuit board, plastic frame and back light; and is characterized by further comprising stoppers which are mounted on a component of said back light to regulate free movement of said liquid crystal panel.
The liquid crystal display according to the invention further comprises: a plane light guide plate having an illumination surface which emits a light guided through a front end face portion from front face portion to outside; a liquid crystal panel which is disposed on front face of the illumination surface of said light guide plate and controls a transmission of light by electric signal supplied through a circuit board; a light source which is disposed adjacent to the front end face portion of said light guide plate in parallel thereto; a main reflector attached to the front end portion of said light guide plate surrounding said light source; and a low voltage side wiring for said light source which is composed of an insulated strip wiring material.
In the liquid crystal display according to the invention, it is preferable that the low voltage side wiring of the light source is arranged by a conductive pattern.
It is preferable that the low voltage side wiring of the light source is arranged on the circuit board.
It is preferable that the low voltage side wiring of the light source is arranged on the front face portion of the light guide plate.
It is preferable that the low voltage side wiring of the light source is arranged on the rear face portion of the light guide plate.
It is preferable that the low voltage side wiring of the light source is formed on the main reflector.
It is preferable that the low voltage side wiring of the light source is arranged along the end faces of the light guide plate except the front end face portion thereof.
It is preferable that the low voltage side wiring of the light source is arranged on end face of a lens film disposed on the front face portion of the light guide plate.
It is preferable that the low voltage side wiring of the light source is composed of a transparent conductive film disposed on the front end face portion of the light guide plate.
It is preferable that the transparent conductive film has a mesh-like conductor which permits a light to transmit therethrough.
The invention of above structure has several advantages as described below.
Since the stoppers are formed on any component of the back light or on the outer frame in the invention, dimensions may be reduced corresponding to a difference in space between the stoppers and those formed on the conventional plastic frame, without adding any new member, whereby a liquid crystal display of smaller external size can be achieved.
Further, since the wiring section for the light source is composed of an insulating type thin wiring material, it is no more necessary to sec
Kabushiki Kaisha Advanced Display
Malinowski Walter J.
McDermott & Will & Emery
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