Liquid crystal display panel

Details Liquid crystal display panel Liquid crystal display panel

2002-12-03

2004-04-27

Chowdhury, Tarifur R. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S113000, C349S158000

Reexamination Certificate

active

06727969

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a liquid crystal display (LCD) panel, in particular to a LCD panel capable of enhancing a light utilization and penetration.
2. Description of Related Art
The conventional penetration LCD panel
10
includes a first substrate
11
, a second substrate
12
, a liquid crystal layer
13
, a first polarizer
16
, a second polarizer
17
and a plurality of pixel electrodes in which each pixel electrode contains a reflection area
14
and a penetration area
15
as shown in FIG.
1
. An incident light of a back light source
18
passes through the LCD panel
10
to hereby display the picture recognizable by naked eyes. The path of the incident light into the liquid crystal layer
13
of the back light source
18
can be expressed by paths a, a′ and a path b. Although part of the incident lights can directly penetrates by passing through area
15
as shown in path b. However, when incident lights are beneath the reflection area
14
, a small portion of those will penetrate by passing through an area
15
as a result of the reflection area
14
and the reflection effect of the back light source
18
, while they will be weakened due to the absorption of the second polarizer
17
in reflection process as shown in path a. Moreover, most of the incident lights under the reflection area
14
are exhausted due to the obstruction of the reflection area
14
or the absorption of the second polarizer
17
as shown in path a′. In general, the penetration rate of conventional half penetration LCD panels
10
is about 25%. A U.S. Pat. No. 6,195,140 discloses a LCD panel
20
providing a first substrate
21
, a second substrate
22
, a liquid crystal layer
23
, a reflection area
24
with uneven surface and a penetration area
25
as shown in
FIG. 2
, while it is not significant to improve the utilization efficiency of surrounding light sources and back light source.
In addition, U.S. Patent Publication No. 2001/0017679A1 discloses a LCD panel
30
, in which a reflection layer
39
is installed under a second polarizer
37
so that the incident light of the back light source
38
can further reflect, making it capable of passing through the penetration area
35
without being directly blocked by the reflection area
34
or absorbed by the second polarizer
37
as shown in path c. Inevitably, part of light sources are consumed by the obstruction of the reflection area
34
as shown in path d and as it is necessary to further coat a reflection layer
39
under the polarizer
37
, an alignment defect and so on resulted in the production process make the manufacturing process more uncontrollable.
SUMMARY OF THE INVENTION
The goal of the invention provides a LCD panel with a higher light efficiency so that the penetration rate increases but its reflection rate won't be reduced.
To achieve the above goal and avoid the disadvantages of the conventional techniques, the invention discloses a LCD panel, including a first substrate, a second substrate, a liquid crystal layer installed in between the first substrate and the second substrate, a plurality of pixel electrodes, in which each pixel electrode contains a plurality of protruded blocks, in which each protruded block includes a first reflection layer installed over the surface of the second substrate and is in a shape of hollow arc with an opening over the center of the arc, and a second reflection layer embedded in the surface of the second substrate and installed right beneath the opening of the first reflection layer.
As such, the incident light of the back light source can pass through the opening of the first reflection layer by utilizing double reflection effects, making the originally blocked incident light by reflection layer once again become a penetrating light to increase the light utilization.


REFERENCES:
patent: 6195140 (2001-02-01), Kubo et al.
patent: 6441873 (2002-08-01), Young
patent: 2001/0017679 (2001-08-01), Ha et al.
patent: 2002/0047970 (2002-04-01), Ono et al.

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