JP2002357807A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device feeding driving signals of a multiplexer only by TAB(tape automated bonding) mounting without using an FPC(flexible printed circuit). SOLUTION: The liquid crystal display device is characterized by disposing a plurality of through electrodes on left and right ends inside a TCP(tape carrier package) of a source driver used in TAB mounting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a polycrystalline silicon T
The present invention relates to a liquid crystal display device formed of FT.

[0002]

2. Description of the Related Art In a liquid crystal display device formed of amorphous silicon, only pixel TFTs can be formed on a glass substrate. Therefore, in recent years, a liquid crystal display device in which a driving circuit such as a source driver and a gate driver is formed on the same glass substrate as a pixel portion using a polycrystalline silicon TFT manufactured by a low-temperature process or a high-temperature process has been developed. ing.

However, polycrystalline silicon TFTs are
There is a problem that the operating frequency is as low as about one-tenth of that of an LSI formed of single crystal silicon. While single crystal silicon operates up to several tens of MHz, polycrystalline silicon has an operation frequency of less than 10 MHz. At this operating frequency, a video signal supplied from a monitor or a TV cannot be processed as it is.

[0004] Therefore, a source driver is formed of single crystal silicon, and TAB (Tape Automated Bonding) or
Means of mounting by COG (Chip / On / Glass) and supplying from outside are used. Recently, in order to reduce the number of source drivers, a liquid crystal display device in which a circuit called a multiplexer is formed on the same glass substrate as pixels has been developed. A multiplexer is a circuit characterized in that a plurality of signal electrodes are provided for one output of a source driver and a plurality of pixels can be driven by one output of the source driver by switching with a switch.

[0005]

However, the problem is that in the COG mounting, a signal is usually supplied from the outside to a source driver such as a printed circuit board by a flexible board (FPC). If you wire the signal line that drives the FP
C can be configured only by mounting, but in the TAB mounting, TA is required to supply a signal for driving the multiplexer.
In addition to the B mounting, the FPC mounting is separately required. FIG.
FIG. 1 is a configuration diagram of a conventional liquid crystal display device. In FIG.
To supply a signal for driving the multiplexer 3, a separate F
It is necessary to use PC19.
C19 mounting is required, and the man-hour and cost increase in the mounting process.

Accordingly, an object of the present invention is to provide a multiplexer driving signal without using an FPC when using a TA.
An object of the present invention is to provide a liquid crystal display device that can be mounted only by B mounting.

[0007]

According to a first aspect of the present invention, there is provided a liquid crystal display device having a plurality of through electrodes provided at the left and right ends in a TCP of a source driver used in TAB mounting. Features. This claim 1
According to the invention, in the electrode provided in the TCP of the source driver closest to the gate driver, a drive signal of the gate driver is supplied to an electrode close to the gate driver,
By supplying the drive signal of the multiplexer to the other electrode, the drive signal of the multiplexer and the signal electrode can be wired on the glass substrate without intersecting with each other. Can be configured only by implementation.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a liquid crystal display according to an embodiment of the present invention. In FIG. 1, a polycrystalline silicon liquid crystal panel and a printed circuit board 13 including a power supply unit 7 and an LCD controller 8 are connected via a plurality of source drivers 2 by TAB mounting. The multiplexer 3 will be described with reference to FIG.

FIG. 2 shows the structure of the multiplexer 3.
Switches SW1, SW2,... In which n signal lines are formed of polycrystalline silicon for one output of the source driver 2.
..CTRn, which are connected via SWn and control the switches, are sequentially turned on, and at this time, n signals are time-divisionally output to one output of the source driver. , It is possible to drive n pixels.

FIG. 3 shows the structure of the source driver 2.
In FIG. 2, a plurality of through electrodes are wired on both sides of an electrode for supplying a driving signal of a source driver, and a driving signal of the gate driver 1 is given to a signal 10 on a side close to the gate driver 1, and another signal is provided. 12 is configured to supply a drive signal for the multiplexer 3.

In this configuration, all the drive signals required for the gate driver 1, source driver 2 and multiplexer 3 can be supplied via the source driver 2 only by TAB mounting. Further, by supplying separate signals of the gate driver drive signal 10 and the multiplexer drive signal 12 to the through electrodes of the two regions provided in the TCP of the source driver 2, various types of signals are provided on the glass substrate of the polycrystalline silicon liquid crystal panel 14. Wiring can be performed without crossing signal lines. In the present invention, it goes without saying that the same effect can be obtained in a liquid crystal display device that supplies a scanning signal from both sides.

[0013]

As described above, according to the embodiment of the present invention, in a liquid crystal display device in which a source driver is mounted on a TAB and driven by a multiplexer, a signal for driving the multiplexer is wired in TCP. , TAB
The liquid crystal display device can be configured only by mounting without various signal lines intersecting, and is of great industrial value.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a liquid crystal display device of the present invention.

FIG. 2 is a configuration diagram of a multiplexer 3 of the embodiment.

FIG. 3 is a configuration diagram of a source driver 2 of the embodiment.

FIG. 4 is a configuration diagram of a conventional liquid crystal display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Gate driver 2 Source driver 3 Multiplexer 4 Polycrystalline silicon TFT 5 Liquid crystal layer 6 Common electrode 7 Power supply unit 8 LCD controller 9 Data signal 10 Gate driver drive signal 11 Source driver drive signal 12 Multiplexer drive signal 13 Printed board 14 Polycrystalline silicon Liquid crystal panel 15 Signal line 16 Source driver IC 17 Electrode 18 Tape 19 FPC G1 Scan electrode CTR1, CTR2,... CTRn Multiplexer drive signal SW1, SW2,.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 9/30 330 G09F 9/30 330Z 5G435 338 338 9/35 9/35 G09G 3/20 621 G09G 3 / 20 621M 680 680G 3/36 3/36 F-term (reference) 2H092 GA50 GA51 GA60 JA24 JB22 JB31 KA04 NA25 PA01 2H093 NC01 NC34 ND54 NE01 5C006 BB16 BC20 BF24 EB05 FA52 5C080 AA10 BB05 DD25 BB11 A44A031902 EA04 EA07 EB02 5G435 AA17 BB12 CC09 EE34 EE37 EE40 EE43 KK09 KK10

Claims (1)

[Claims] 1. A polycrystalline silicon TFT liquid crystal panel having a plurality of scanning electrodes, a plurality of signal electrodes, and pixels formed of liquid crystal, a gate driver for driving the plurality of scanning electrodes, and a plurality of signal electrodes. Driving TAB (Tap
e. Automated Bonding), and the plurality of gate drivers and the plurality of source drivers drive the pixels through the plurality of scan electrodes and the plurality of signal electrodes. Then, an image is displayed on the liquid crystal panel by driving the pixel, and an image can be displayed by switching the plurality of signal electrodes with a switch so that a plurality of the pixels can be driven with respect to one output of the plurality of source drivers. A liquid crystal display device comprising a driving circuit (hereinafter, referred to as a multiplexer) on the same glass substrate as the pixels, wherein TCP is used as signal supply means for driving the multiplexer.
(Tape Carrier Package), a plurality of through electrodes are wired on both sides of an electrode for supplying a drive signal of the TCP source driver disposed closest to the gate driver, and a plurality of through electrodes are disposed near the gate driver. Supply a drive signal to the gate driver to the electrode,
A liquid crystal display device, characterized in that a driving signal of the multiplexer is supplied to the other electrode.