JP2001033762A - Planar display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the thickness of a liquid crystal module and to obtain a planer display device having a narrow frame and thin structure by constituting a scanning line driving circuit board of a flexible printed circuit board. SOLUTION: A signal line driving circuit board 12 is arranged on the longer side line of a liquid crystal panel 11, and the liquid crystal panel 11 and the signal line driving circuit board 12 are connected with a TCP (tape carrier package) 14 on which a signal line driving IC 13 is mounted. A TCP 16 on which a signal line driving circuit IC 15 is mounted is arranged on the shorter side line of the liquid crystal panel 11. The one end of the TCP 16 is connected to the liquid crystal panel 11, and the other end is connected to a flexible printed circuit board (FPC) 17 consisting of a substrate having flexibility such as a polyimide and copper wirings on the substrate. The FPC 17 is also connected to the signal line driving circuit board 12. Digital video signals or the like sent from a control IC are inputted through an I/F connector arranged on the signal line driving circuit board 12, and a part of the signals is supplied to the scanning line driving IC 15 through the FPC 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display device, and more particularly, to a liquid crystal display device having a narrow frame and a thin structure.

[0002]

2. Description of the Related Art A flat display device represented by a liquid crystal display device has been widely used as a display device of a notebook PC (personal computer) in particular because of its thinness, light weight and low power consumption. I have. In recent years, notebook PCs tend to have a large display area without changing the external size of the PC main body. Against this background, TCP (Tap
eCarrier Package) has been developed. TCP mounts a liquid crystal panel driving IC on a flexible flexible plastic substrate such as polyimide. TCP mounting can have a relatively thick liquid crystal panel and a PCB (Print Circuit Board) or the like. This is a method of connecting a rigid drive circuit board having no flexibility with TCP.

FIG. 6 is an expanded schematic plan view of a liquid crystal module 10 provided with an a-Si TFT liquid crystal panel, and shows an arrangement of driving circuits around the panel. The signal line drive circuit board 2 is disposed on the long side (signal line connection side) of the liquid crystal panel 1, and the liquid crystal panel 1 and the signal line drive circuit board 2
Are connected by the TCP 4 on which the signal line driving IC 3 is mounted. On the short side (scanning line connection side) of the liquid crystal panel 1, a scanning line driving circuit board 5 is arranged.
The liquid crystal panel 1 and the scanning line driving circuit board 5 are connected by a TCP 7 on which a scanning line driving IC 6 is mounted. The TCPs 4 and 7 have a bent structure, and each TCP is bent in a U-shape along a backlight (not shown) arranged below the liquid crystal panel 1 so that the signal line drive circuit board 2 and the scan line drive are formed. Circuit board 5
Can be arranged on the back side of the liquid crystal panel 1.

[0004]

FIG. 7 and FIG. 8 show FIG.
7 is a partial cross-sectional view of the liquid crystal module 10 when the TCP is bent. FIG. 7 is a cross-sectional view taken along line AA of FIG. 6, and FIG.
BB section.

[0005] The backlight 8 is configured so that light emitted from the light source lamp 8a enters from the side surface of the light guide plate 8b and is output to the entire panel surface. The light guide plate 8b exemplified here is formed in a tapered shape so that the thickness gradually decreases from one end (the light source lamp 8a side) in the short side direction of the liquid crystal panel 1 toward the other end. FIG. 7 shows the side surface of the thickest portion of the backlight 8.

The conventional liquid crystal module 10 has a problem that the backlight 8 and the scanning line driving circuit board 5 overlap with each other, so that the thickness of the panel increases. In particular, as shown in this example, in the case where one backlight 8 is arranged at the end on the long side, the scanning line driving circuit board 5 also overlaps the thickest portion of the backlight 8, so that the liquid crystal module 10 It was difficult to reduce the thickness.

An object of the present invention is to provide a flat display device having a thin frame, a thin frame, and a reduced thickness of a liquid crystal module.

[0008]

In order to achieve the above object, the present invention provides a display panel in which a plurality of scanning lines and a plurality of signal lines are arranged in a matrix, and a scanning line driving device mounted with TCP. Scan line drive circuit board connected to the scan line side of the display panel via a display IC, and a signal line drive circuit connected to the signal line side of the display panel via a TCP mounted signal line drive IC A flat panel display device having a substrate, wherein the scanning line driving circuit substrate is formed of a flexible printed wiring substrate.

According to a second aspect of the present invention, there is provided a display panel in which a plurality of scanning lines and a plurality of signal lines are arranged in a matrix.
A scanning line driving circuit board connected to the scanning line side of the display panel via a scanning line driving IC mounted with TCP;
A signal line driving circuit board connected to a signal line side of the display panel via a signal line driving IC mounted on a CP, wherein the scanning line driving IC is connected to the signal line driving circuit board. And the scanning line driving IC and the scanning line side of the display panel are connected by a flexible printed wiring board.

Further, according to a third aspect of the present invention, a display panel in which a plurality of scanning lines and a plurality of signal lines are arranged in a matrix is connected to a scanning line side of the display panel via a scanning line driving IC. Scanning line drive circuit board and signal line drive I
C. A flat display device comprising: a signal line driving circuit board connected to the signal line side of the display panel via C; wherein the scanning line driving IC is mounted on the signal line driving circuit board; The driving IC and the display panel are connected by a flexible printed wiring board.

According to the above flat display device, the scanning line driving IC mounted on the TCP is connected to the flexible printed wiring board instead of the scanning line driving circuit board. There is no need to dispose a line drive circuit board, and the thickness of the module can be reduced by the amount of the scan line drive circuit board.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the flat display device according to the present invention is applied to a liquid crystal display device will be described below.

[First Embodiment] FIG. 1 is a schematic plan view of a developed liquid crystal module 100 in a first embodiment.
In FIG. 1, a signal line driving circuit board 12 is disposed on the long side of the liquid crystal panel 11, and the liquid crystal panel 11 and the signal line driving circuit board 12 are connected by a TCP 14 on which a signal line driving IC 13 is mounted. Have been. On the other hand, a TCP 16 on which a scanning line driving IC 15 is mounted is arranged on the short side of the liquid crystal panel 11. One end (output terminal side) of the TCP 16 is connected to the liquid crystal panel 11, and the other end (input terminal side) is an FPC (flexible printed circuit board) in which copper wiring is provided on a flexible substrate such as polyimide. 17). This FPC 17 is also connected to the signal line drive circuit board 12.

A digital video signal, a timing signal, and the like sent from a control IC (not shown) are input from an I / F connector (not shown) provided on the signal line drive circuit board 12, and a part of the signals is supplied to the scanning line drive via the FPC 17. Is supplied to the application IC 15.

FIGS. 2 and 3 show the FPC and TCP of FIG.
FIG. 2 is a partial cross-sectional view of the liquid crystal module 100 when the liquid crystal module 100 is bent. FIG. 2 is a cross-sectional view taken along line AA of FIG.
It corresponds to the B section. The backlight 18 is shown in FIG.
It is assumed to be configured as follows.

A TCP on which a scanning line driving IC 15 is mounted
As shown in FIG. 2, the FPC 16 and the FPC 17 are bent in a U-shape along the backlight 18.
Further, as shown in FIG. 3, the signal line drive circuit board 12 is arranged so as to overlap the thin portion of the backlight 18.

The liquid crystal module 1 configured as described above
At 00, the scanning line driving IC 1 mounted on the TCP 16
5 is connected to the FPC 17 instead of the scanning line driving circuit board formed of a PCB, so that there is no need to dispose the scanning line driving circuit board 5 as in the conventional example (FIG. 8), The thickness of the module can be reduced by the amount of the circuit board 5.

Second Embodiment FIG. 4 is a schematic plan view showing a developed liquid crystal module 101 according to a second embodiment.
4, the same parts as those in FIG. 1 are indicated by the same reference numerals.

In FIG. 4, a signal line driving circuit board 12 is disposed on the long side of the liquid crystal panel 11,
And a signal line driving circuit board 12, a signal line driving IC
13 are connected by a TCP 14 mounted. The signal line drive circuit board 12 includes a scanning line drive IC 15.
Is connected to one end (input terminal side) of the TCP 19 on which is mounted. The other end of the TCP 19 (output terminal side)
It is connected to the short side (scanning line connection side) of the liquid crystal panel 11 via the FPC 20.

A digital video signal, a timing signal, and the like sent from a control IC (not shown) are input from an I / F connector (not shown) provided on the signal line drive circuit board 12, and a part of the signals is a scanning line mounted on the TCP 19. It is supplied to the driving IC 15. Then, the scanning line driving I
The scanning signals sent from C15 at a predetermined timing are sequentially output to each scanning line of the liquid crystal panel 11 via the FPC 20.

The side structure of the liquid crystal module 101 when the FPC and TCP in FIG. 4 are bent is substantially the same as that in FIGS. 2 and 3 of the first embodiment. That is, also in the liquid crystal module 101 of the second embodiment, it is not necessary to dispose the scanning line driving circuit board 5 as in the conventional example (FIG. 8). Can be made thinner.

Third Embodiment FIG. 5 is a schematic plan view showing a developed liquid crystal module 102 according to a third embodiment.
Also in FIG. 5, the same parts as those in FIG. 1 are indicated by the same reference numerals.

In FIG. 5, a signal line drive circuit board 12 is disposed on the long side of the liquid crystal panel 11,
And a signal line driving circuit board 12, a signal line driving IC
13 are connected by a TCP 14 mounted. The scanning line driving IC 2 is provided on the signal line driving circuit board 12.
1 has been implemented. The short side (scanning line connection side) of the scanning line driving IC 21 and the liquid crystal panel 11 is
2 are connected.

Digital video signals, timing signals, and the like sent from a control IC (not shown) are input from an I / F connector (not shown) provided on the signal line drive circuit board 12, and a part of the signals is supplied to a scanning line drive IC 21. Is done. The scanning signal sent from the scanning line driving IC 21 at a predetermined timing is sequentially output to each scanning line of the liquid crystal panel 11 via the FPC 22.

The side structure of the liquid crystal module 102 when the FPC and TCP shown in FIG. 5 are bent is substantially the same as that shown in FIGS. 2 and 3 of the first embodiment. That is, also in the liquid crystal module 102 according to the third embodiment, it is not necessary to dispose the scanning line driving circuit board 5 as in the conventional example (FIG. 8). Can be thin.

[0026]

As described above, in the flat panel display according to the present invention, the scanning line driving IC is connected to the flexible printed circuit board, so that the conventional scanning line driving circuit is used. There is no need to dispose a substrate, and the thickness of the module can be reduced by the amount corresponding to the scanning line driving circuit substrate. Therefore, a flat display device having a narrow frame and a thin structure can be realized.

[Brief description of the drawings]

FIG. 1 is a schematic plan view in which a liquid crystal module according to a first embodiment is developed.

FIG. 2 is a partial cross-sectional view corresponding to the AA cross section in FIG.

FIG. 3 is a partial sectional view corresponding to a section taken along line BB of FIG. 1;

FIG. 4 is a schematic plan view showing a developed liquid crystal module according to a second embodiment.

FIG. 5 is a schematic plan view showing a developed liquid crystal module according to a third embodiment.

FIG. 6 is a schematic plan view showing a developed liquid crystal module including an a-SiTFT liquid crystal panel.

FIG. 7 is a partial cross-sectional view corresponding to the AA cross section in FIG. 6;

FIG. 8 is a partial cross-sectional view corresponding to the BB cross section in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Liquid crystal panel 12 Signal line drive circuit board 13 Signal line drive IC 14, 16, 19 TCP 15, 21 Scan line drive IC 17, 20, 22 FPC 18 Backlight

Claims (3)

[Claims] 1. A display panel in which a plurality of scanning lines and a plurality of signal lines are arranged in a matrix, and a scanning line connected to a scanning line side of the display panel via a scanning line driving IC mounted with TCP. A flat panel display device comprising: a driving circuit board; and a signal line driving circuit board connected to a signal line side of the display panel via a signal line driving IC mounted on a TCP. A flat display device comprising a flexible printed wiring board. 2. A display panel in which a plurality of scanning lines and a plurality of signal lines are arranged in a matrix, and a scanning line connected to a scanning line side of the display panel via a scanning line driving IC mounted with TCP. A flat panel display device comprising: a driving circuit board; and a signal line driving circuit board connected to a signal line side of the display panel via a signal line driving IC mounted on a TCP. A flat display device, wherein the flat panel display device is connected to a signal line driving circuit board, and the scanning line driving IC and the scanning line side of the display panel are connected by a flexible printed wiring board. 3. A display panel in which a plurality of scanning lines and a plurality of signal lines are arranged in a matrix, and a scanning line driving circuit board connected to a scanning line side of the display panel via a scanning line driving IC. And a signal line driving circuit board connected to the signal line side of the display panel via a signal line driving IC, wherein the scanning line driving IC is mounted on the signal line driving circuit board. A flat display device, wherein the scanning line driving IC and the display panel are connected by a flexible printed circuit board.