Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2001-06-27
2003-04-01
Kim, Robert H. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S113000, C349S114000
Reexamination Certificate
active
06542209
ABSTRACT:
This application claims the benefit of Korean Application No. 10-2000-37708 filed Jul. 3, 2000, which is hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display, and more particularly, to a color filter of a liquid crystal display and method of fabricating the same. Although the present invention is suitable for a wide scope of applications, it is particularly suitable for simplifying the fabricating process of the color filter and improving characteristics in color and brightness.
2. Discussion of the Related Art
A liquid crystal display can be manufactured in various sizes. Thus, the liquid crystal display have been employed in various display devices from a small sized display device such as a watch, a calculator, and a portable terminal, to a large sized display device such as a monitor of a computer and a television.
Further, in comparison with other devices, the liquid crystal display consumes relatively a small electric power, and it is relatively easy to be carried. Consequently, the liquid crystal display has several advantages among display devices.
Among the conventional display devices, a cathode ray tube (CRT) is a device for accelerating electrons to collide with phosphor ions on a screen to emit light. Images are displayed on the screen. However, the CRT consumes a high electric power and requires a space for accelerating the electrons, so that a volume of the CRT is relatively large. On the other hand, as an alternative to the CRT, the liquid crystal display is the most commonly used as a display device due to its small consumption of electric power and its various sizes.
The liquid crystal display device is a display device utilizing a liquid crystal, which has an intermediate characteristic between a solid and a liquid. An arrangement in the liquid crystal is changed according to the change of the voltage applied thereto. Therefore, the arrangement of the liquid crystal is adjusted to change a degree of transmission of light at the portion in the liquid crystal display by properly adjusting a voltage applied to a specific portion of the liquid crystal. As a result, a division of light and darkness is generated therein, thereby displaying desired images on the screen.
In case of displaying colors in the liquid crystal display, a transmission rate of the white light through the liquid crystal is adjusted. Thus, desired colors are displayed by means of an additive mixture of three primary colors generated by the light through red, green, and blue color filters. In this case, the adjustment of the transmission rate of the light through the liquid crystal is carried out by changing an intensity of the electric field between the opposite ends of the liquid crystal through adjusting a voltage.
In a half reflection and half transmission type color liquid crystal display, an image is displayed by means of the light emitted from a backlight and the light incident to the liquid crystal display from the exterior. In this type of the liquid crystal display, a transmission section displays an image by means of the light emitted from the backlight whereas a reflection section displays an image by reflecting the light incident to the liquid crystal display from the exterior.
FIG. 1
is a cross-sectional view illustrating a color filter of a liquid crystal display in the background art.
Referring to
FIG. 1
, a color filter in thebackground art includes a glass substrate
101
, a color resin layer
102
, and a transparent electrode
103
. The color resin layer
102
has a transmission section where the light emitted from a backlight passes through while a reflection section where the light incident from the exterior is reflected. The transparent electrode
103
is formed of a conductor to apply a voltage to a liquid crystal cell.
Further, below the reflection section of the color resin layer
102
, an acryl resin layer
104
for adjusting a. distance for the light to pass through the color resin layer
102
is formed on the glass substrate
101
. A backlight (not shown) is disposed at the close proximity of the transparent electrode
103
. The transparent electrode
103
is opposed to a lower plate having a pixel electrode.
In the transmission section of the color filter, the light emitted from the backlight disposed at the close proximity of the transparent electrode
103
successively passes through the transparent electrode
103
, the color resin layer
102
, and the glass substrate
101
in displaying color images. In this case, a color is expressed by a color contained in the color resin layer
102
. Brightness is adjusted by controlling the voltage applied to the corresponding pixel.
In the reflection section of the color filter, the light incident toward the glass substrate
101
passes through the acryl resin layer
104
, the color resin layer
102
, and the transparent electrode
103
. The light is then reflected by a metal portion (not shown) of the pixel electrode disposed at the close proximity of the transparent electrode
103
. The reflected light travels through the transparent electrode
103
, the color resin layer
102
, the acryl resin layer
104
, and the glass substrate
101
in displaying color images. A color in the reflection section is also expressed by a color contained in the color resin layer
102
, and brightness is adjusted by controlling the voltage applied to the corresponding pixel.
The transmission section and the reflection section usually correspond to a single pixel. As described above, light passes through the color resin layer
102
twice in the reflection section and passes through the color resin layer
102
one time in the transmission section. Therefore, when the reflection section and the transmission section have a thickness the same as the color resin layers, the reflection section has brightness lower than that of the transmission section.
Consequently, the reflection section is formed to have a thickness different from that of the transmission section by forming the acryl resin layer
104
in the reflection section. Thus, a distance for the light to pass through the reflection section is reduced, thereby properly adjusting brightness and color of the reflection section.
The above-mentioned color filter in the background art is fabricated as follows. First, the acryl resin layer
104
is formed on the glass substrate
101
. In this process, the acryl resin layer
104
is formed only in the reflection section through a photolithography process step. Thereafter, the color resin layer
102
is formed on the glass substrate
101
having the acryl resin layer
104
. The transparent electrode
103
is then formed on the color resin layer
102
.
In the color filter of the background art as described above, the acryl resin layer
104
is partly formed on the glass substrate
101
corresponding to the reflection section and then the color resin layer
102
is formed thereon. Thus, there is a disadvantage that an additional step for forming the acryl resin layer
104
is required. Further, since a range for the thickness d of the acryl resin layer
104
is very limited within the range in which the color resin layer
102
is flat, it is very difficult to optimize the characteristics of color and brightness of the reflection section.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a color filter of a liquid display and method of fabricating the same that substantially obviate one or more of problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a color filter of a color liquid crystal display and method of fabricating the same that simplifies the method of manufacturing the color filter, and that optimizes brightness and color in the liquid crystal display.
Additional features and advantages of the invention will be set forth in the description, which follows and in part will be apparent from the description, or may be learned by practice of the invention. The object
Kim Woo Hyun
Kim Woong Kwon
Duong Thoi
LG. Philips LCD Co. Ltd.
Morgan & Lewis & Bockius, LLP
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