Liquid crystal display including driving circuit substrate...

Details Liquid crystal display including driving circuit substrate... Liquid crystal display including driving circuit substrate...

2000-06-20

2002-01-29

Sikes, William L. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Holder, support, frame, or housing

Reexamination Certificate

active

06342933

ABSTRACT:

BACKGROUND AND SUMMARY OF THE INVENTION
1. Industrial Field
The present invention relates to a liquid crystal display and, more particularly, to a holding structure of its driving circuit substrate.
2. Prior Art
In conventional liquid crystal displays, a holding structure of a driving circuit substrate shown in FIGS.
3
(
a
), (
b
) and (
c
) is known. In FIG.
3
(
a
), a driving circuit substrate
12
placed between a metal box member
11
and a mold box member
17
mounted with a back light source is held by a conductive elastic spacer
13
inserted between the metal box member
11
and the driving substrate
12
, and the driving circuit substrate
12
is grounded to the metal box member
11
through this spacer
13
.
In FIG.
3
(
b
), the driving circuit substrate
12
is held between a cut-and-hung-down portion
11
c
formed in the metal box member
11
and the mold box member
17
, the driving circuit substrate
12
is secured with a screw
16
, and the driving circuit substrate
12
is grounded to the metal box member
11
.
In FIG.
3
(
c
), the metal box member
11
is provided with a cut-and-hung-down portion
11
d
, the driving circuit substrate
12
is held between the cut-and-hung-down portion
11
d
and the mold box member
17
, and the driving circuit substrate
12
is grounded to the metal box member
11
through the cut-and-hung-down portion
11
d.
The holding and grounding structure in FIG.
3
(
a
) has a problem wherein the conductive elastic spacer
13
is essentially required. Therefore, not only required number of parts is increased but also the modulus of elasticity of the conductive elastic spacer
13
varies due to application of heat. As a result, holding and grounding of the driving circuit substrate
12
and the metal box member
11
become uncertain.
The holding and grounding structure in FIG.
3
(
b
) has a problem wherein the driving circuit substrate
12
is secured with the screw
16
. Therefore, when some external force such as an impact is applied thereto, the driving circuit substrate
12
cannot follow behavior of a liquid crystal panel
14
, stress concentration takes place at a TCP (a Tape Carrier Package)
15
where the liquid crystal panel
14
and the driving circuit substrate
12
are connected, and the TCP, which is a weak portion, is broken, eventually resulting in malfunction of the liquid crystal display.
The holding and grounding structure in FIG.
3
(
c
) has a problem wherein it is difficult to control size of the cut-and-hung-down portion
11
d
of the metal box member
11
, and holding and grounding of the driving circuit substrate
12
and the metal box member
11
become uncertain.
As described above, any of the conventional structures has problems such as uncertainty of grounding of the driving circuit substrate and the metal box member, increase in number of the parts, decrease in machinery strength, and so on.
SUMMARY OF THE INVENTION
The present invention was made to solve the above-discussed problems incidental to the prior art and has an object of providing a liquid crystal display in which unnecessary stress on the connecting portion between the driving circuit substrate and the liquid crystal panel is relaxed to the utmost and the driving circuit substrate is securely grounded to the metal box member.
A liquid crystal display according to the invention possesses at least a metal box member, a mold box member with a back light source, and a driving circuit substrate for driving a liquid crystal panel held by these two cage bodies, wherein the driving circuit substrate is held between a convex portion formed in one of the foregoing two cage bodies and an elastic pressing portion formed in the other box member, the driving circuit substrate is grounded to the metal box member through this holding portion, and the driving circuit substrate is held without being secured.
It is preferable that a portion where the elastic pressing portion contacts the driving circuit substrate is convex.
Other objects, features and advantages of the invention will become apparent in the course of the following description with reference to the accompanying drawings.


REFERENCES:
patent: 6128063 (2000-10-01), Uchiyama et al.
patent: 61-2127 (1986-01-01), None
patent: 6-347814 (1994-12-01), None

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