Computer graphics processing and selective visual display system – Display driving control circuitry – Physically integral with display elements
Reexamination Certificate
2000-04-17
2003-10-28
Shalwala, Bipin (Department: 2673)
Computer graphics processing and selective visual display system
Display driving control circuitry
Physically integral with display elements
C345S042000, C345S051000, C345S084000, C345S087000, C345S102000, C349S056000, C349S061000, C349S062000, C349S058000, C349S070000
Reexamination Certificate
active
06639589
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tape carrier package for a compact size liquid crystal display (LCD), and more particularly to a tape carrier package (TCP) capable of receiving both of gate signal and data signal which are processed in a single integrated printed circuit board and transmitting the processed signals to an LCD panel and another TCP. Further, the invention relates to a liquid crystal display panel to which the tape carrier package is applied.
2. Description of the Related Art
Generally, an LCD is a mostly used type of flat panel display. Especially, the small size, lighter weight and lower power consumption render the LCD to replace the traditional cathode ray tube (CRT). The LCD is currently used as a monitor for a lap-top computer and even for a desktop computer, gaining its popularity.
As shown in
FIG. 1
, an LCD includes an LCD panel
101
and a light supply unit. The LCD panel
101
includes a TFT substrate
10
, a color filter substrate
20
, multiple gate TCPs
30
connected to gate lines (not shown) of the TFT substrate
10
, multiple data TCPs
40
connected to data lines (not shown) of the TFT substrate
10
, a gate PCB
50
connected to the multiple gate TCPs
30
, a data PCB
60
connected with the multiple data TCPs
40
. The light supply unit includes multiple optical sheets such as a light guiding plate
90
, a light diffusing plate (not shown), etc., a lamp assembly
80
, and a receiving case called as “mold frame”. The light guiding plate
90
has a decreasing thickness as it travels from the lamp unit
80
to the data PCB
60
.
A power supply unit and a controller that processes gate signals and data signals coming from an external device are mounted on the data PCB
60
. A gate voltage supply part is formed on the gate PCB
50
and supplies a gate driving voltage to gate lines by a control signal from the controller on the data PCB
60
.
To supply the control signal and the gate driving voltage into the gate PCB
50
from the data PCB
60
, connectors
55
and
65
are respectively installed in the gate PCB
50
and data PCB
60
and are connected to each other through a connecting member, “flexible printed circuit (FPC)”.
Semiconductor fabrication technologies have developed in the areas of thin film formation, and packaging. This allows semiconductor devices to be mounted on the gate PCB
50
and to function as gate power supply source on the data PCB
60
.
Under such a configuration, the gate PCB
50
only transfers to the gate TCP
30
gate driving signals processed in the data PCB
60
.
The conventional LCD has following problems.
First, in order to apply gate driving signals processed in data PCB
60
to gate PCB
50
, gate PCB
50
and data PCB
60
need connectors
55
and
65
.
The connectors
55
and
56
are generally installed on the front surface or on the rear surface of the PCBs
50
and
60
. This increases the thickness of the LCD and makes it difficult to achieve a compact size LCD.
And the flexible printed circuit (FPC)
70
that connects the connector
55
and the connector
65
complicates the assembly process and increases the fabrication costs.
Finally, a bent type PCB that is mostly used currently bends a gate PCB
50
and data PCB
60
and they are fixed at the rear surface of the reflecting plate of a backlight assembly. In such a configuration, the data PCB
60
is put in a space between a relatively thin side edge
92
of the non-symmetric light guiding plate
90
and the mold frame. Thus the data PCB
69
does not increase the thickness of the LCD much. On the other hand, the gate PCB
50
is put in a space between a thickness varying side of the light guiding plate
90
, and the mold frame. Specifically, one side of the gate PCB
50
is attached to a thick portion of the rear surface of the light guiding plate
90
, making a thick LCD depending on the thickness of the light guiding plate
90
.
SUMMARY OF THE INVENTION
The present invention is to provide an integrated PCB that has a gate PCB and a data PCB on one board and is capable of allowing driving signals to be applied to gate lines and data lines without using additional connectors and flexible printed circuits.
It is another object of the present invention to allow a tape carrier package that receives a driving signal from the integrated PCB to transmit the received driving signal into another tape carrier package.
It is yet another object of the present invention to prevent delays of driving signals when a driving signal processed in the integrated PCB is sent to gate lines or data lines via tape carrier packages.
It is still another object of the present invention to provide an improved assembly between tape carrier packages and TFT substrate, thereby attaining an easy carrying and decreasing the thickness of the panel.
To achieve these and other advantages in accordance with the purpose of the present invention as embodied and broadly described, a tape carrier package comprises a base substrate, a gate driver IC formed on the base substrate, an input pattern formed on the base substrate that supplies gate driving signals input from an external device to the gate driver IC, a first output pattern formed on said base substrate that outputs a first gate driving signal processed in the gate driver IC, and a second output pattern formed on said base substrate, that outputs a second gate driving signal bypassing the gate driver IC among the gate driving signals.
Also a liquid crystal display panel assembly and a liquid crystal display using such an assembly are disclosed.
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Kang Nam-Soo
Kim Dong-Gyu
Kim Sang-Soo
Lee Gyu-Su
Oh Choong-Seob
Kovalick Vincent E.
McGuireWoods LLP
Shalwala Bipin
LandOfFree
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