JPH05165044A - Surface mounted package - Google Patents

Abstract

PURPOSE:To facilitate signal wiring on the input side and provide possibility of working well with a number of input signals by enlarging the package width on the input terminal side relative to the package width on the output side of a driving LSI on a liquid crystal display panel. CONSTITUTION:When a plurality of driving LSIs 102 are to be mounted on a liquid crystal display panel 101, the output side is given a larger width than the input side in order to widen the input pitch of surface-mount packages 103, 106-108. The enlarged input side parts of these surface-mount packages are overlapped in such a way that they do not touch one another and are mounted on the liquid crystal panel 101. According to this arrangement where the incoming signal line 105 is wider than the outgoing signal line 4, the inter- wire pitch of the incoming signal line 105 becomes coarser than the inter-wire pitch of the outgoing signal line 104, which facilitates mounting on a printed circuit board 109.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount package of a drive LSI for a liquid crystal display panel.

[0002]

2. Description of the Related Art In recent years, as computers have become smaller and lighter, portable computers have become common, and liquid crystal panels are often used as display devices.
Since this liquid crystal panel can be manufactured to be thin and lightweight, it is attracting attention as a display device that replaces a conventional CRT in the future.

On the other hand, a drive LS for directly inputting digital display data output from a display system of a computer.
I has been developed, and the number of input signal lines is increasing as multi-gradation display progresses. Therefore, the input pitch of the TAB is narrowed, and the mounting tends to be difficult.

A conventional surface mount package will be described below with reference to the configuration diagram of a liquid crystal display device using the conventional surface mount package shown in FIG.

In the figure, 101 is a liquid crystal panel, and 102 is
Is a drive LSI, 203 is a surface mount package, 204 is an output signal line from the drive LSI 102, and 205 is a drive LS.
Input signal lines to I102, 206 to 208 are surface mount packages for the number of output signal lines required to display the liquid crystal panel 101, 209 is a printed wiring board that supplies input signals to all the surface mount packages, and 210 is It is a signal line for supplying display data and control signals from a display system of a computer.

A conventional surface mount package for a liquid crystal display device constructed as described above will be described below.

Output signal line 204 of each surface mount package
The line pitch is determined by the size of the liquid crystal panel 101 and the number of display pixels. The pitch between the input signal lines 205 is also
It depends on the size of the liquid crystal panel 101 and the number of input signal lines. Normally, the number of output signal lines is larger than the number of input signal lines, and therefore the pitch between lines of the output signal lines 204 is narrower than the pitch between lines of the input signal lines 205.

Therefore, in the conventional surface mount package, the surface mount package is first mounted on the liquid crystal panel 101 from the output side having a narrow pitch between signal lines. After that, the input side having a wide pitch is mounted on the printed wiring board 209. Since the printed wiring board 209 has a coefficient of linear expansion and expands and contracts in the horizontal direction of the liquid crystal panel, the pitch between the input signal lines allowed for the surface mount package becomes a large value on the output side. In the case of a drive LSI with a low display gradation, the bit width of data can be small and the number of input signals is small,
It can be mounted with this surface mount package.

[0009]

However, since the bit width of data increases and the number of input signals increases as the number of display gradations increases, the pitch between the input signal lines is small in the above-mentioned conventional surface mount package. It becomes difficult to implement.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a surface mount package that can handle a large number of input signals.

[0011]

In order to achieve the above object, the present invention enlarges the input pitch of the surface mount package, so that the width of the input side of the surface mount package is made larger than the width of the output side. The parts of the width on the input side, which have spread, are mounted on the liquid crystal panel so that they do not touch each other.

[0012]

According to the present invention, since the width of the surface mount package on the input side is widened by the above configuration, the allowable wiring pitch on the input side is relaxed to facilitate mounting on the printed wiring board.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 103 is an input signal line 105.
The surface mount package of the present invention in which the width on the side is wider than the width on the side of the output signal line 104, 106 to 108 are the liquid crystal panel 10.
1 is a surface mount package for the number of output signals necessary to display 1, 109 is a printed wiring board that supplies input signals to all surface mount packages, and 110 is display data and control signals from the display system of the computer. Is a signal line for. The other components having the same functions as those of the conventional example are designated by the same reference numerals.

The surface mount packages 103 to 108 are mounted on the liquid crystal panel so that a part of the input signal line 105 with the wide interval is not in contact with the input signal line of the other surface mount package adjacent to each other.

The surface mount package of this embodiment having the above structure will be described below.

Output signal line 104 of each surface mount package
The line pitch is determined by the size of the liquid crystal panel 101 and the number of display pixels. The pitch between the input signal lines 105 is also
It depends on the size of the liquid crystal panel 101 and the number of input signal lines. In the case of the present embodiment, the width of the output signal line 104 side is wider than the width of the surface mount package on the input signal line 105 side.
The pitch becomes wider than the line pitch of 4 and the mounting on the printed wiring board becomes easy.

However, since the width of each surface mount package on the side of the input signal line 105 is wide, an overlapping portion of the surface mount packages is generated. Therefore, a double-sided board is used for the printed wiring board, or two sheets are used. Implement by dividing into.

Further, the width of the package is not limited to the input signal line 105 side, but the output signal line 10 is widened.
The same structure can be used for the four sides to widen the width, and thus the number of output wirings can be increased.

[0020]

According to the present invention, the width of the surface mount package on the input signal line side of the surface mount package or on the input signal line side and the output signal line side is widened, so that the input / output wiring is improved as the image of the liquid crystal panel is refined. Even if the number increases, the implementation can be facilitated.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a liquid crystal display device mounted with a surface mount package of the present invention.

FIG. 2 is a plan view showing the configuration of a liquid crystal display device mounted with a conventional surface mount package.

[Explanation of symbols]

 101 liquid crystal panel 102 drive LSI 103 surface mounting package 104 output signal line 105 input signal lines 106 to 108 surface mounting package 109 printed wiring board

Claims (2)

[Claims] 1. A surface mount package in which a package width on an input terminal side is expanded with respect to a package width on an output terminal side of a drive LSI of a liquid crystal display panel to facilitate signal wiring on an input side. 2. A surface mount package for mounting a plurality of drive LSIs on a liquid crystal display panel, wherein the package width on the input / output terminal side of each drive LSI is expanded to facilitate signal wiring on the input side and the output side.