JP2001021907A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device which is made thin while having narrow frame. SOLUTION: In this liquid crystal display device, an X-print wiring board 16 is disposed on the back side of a liquid crystal display panel 13 along the long side of a display device frame 12 to decrease the frame width, and only a display data bus function is mounted on the X-print wiring board 16. A Y-print wiring board 19 is disposed along the short side of the display device frame 12 in almost the same level as that of a matrix array substrate 14 without causing interference, and a power supply function and a scanning data bus function are mounted on the Y-print wiring board 19. An interface print wiring board 20 is disposed under the Y-print wiring board 19 to the position under the projected part of the matrix array substrate 14, which is partly projecting from the counter substrate 15. An interface function, controlling function and common drive function and power supply function are mounted on the interface print wiring board 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin liquid crystal display device.

[0002]

2. Description of the Related Art Conventionally, as this type of liquid crystal display device,
For example, a liquid crystal display device having a configuration shown in FIGS. 3 and 4 is known.

The liquid crystal display device shown in FIGS. 3 and 4 has a flat rectangular display device frame 2 formed in an L-shaped cross section and having a display opening 1 on the front surface.

[0006] A liquid crystal display panel 3 is mounted facing the display opening 1. The liquid crystal display panel 3 has a matrix array substrate 4 and a counter substrate 5 facing the matrix array substrate 4. Note that the matrix array substrate 4 is larger than the opposing substrate 5, and the matrix array substrate 4 protrudes from the opposing substrate 5 in the plane direction.

On the back side of the liquid crystal display panel 3 along the long side of the display frame 2 to narrow the frame, an X-printed wiring board 6 as a first printed wiring board is provided. The X-printed wiring board 6 has an interface function, a control function, and a display data bus function.
The liquid crystal display panel 3 and the X-printed wiring board 6 are provided with a common driving function and a power supply function. The TAB (Tape Automated) has a driver IC mounted on a flexible wiring board.
ated Bonding) 9a.

Further, along the short side of the display device frame 2,
A Y-printed wiring board 7 as a second printed wiring board is disposed below the matrix array substrate 4 in the display device frame 2, and the Y-printed wiring board 7 has electric components 8 on both sides. , 8 and a power supply function in addition to the scan data bus function. The liquid crystal display panel 3 and the Y-printed wiring board 7 are electrically connected via the TAB 9b.

The X-printed wiring board 6 and the Y-
The printed wiring board 7 is electrically connected by a flexible board 10.

[0008]

However, in the case of the above-mentioned conventional liquid crystal display device, the X-printed wiring board 6 is required.
And the Y-printed wiring board 7 share functions, so that there is a limit in reducing the size of each, and the flat surface must be reduced for narrowing the frame. turn into.

More specifically, for example, the thickness of the liquid crystal display panel 3 is 2.0 mm, the thickness of the Y-printed wiring board 7 is 0.6 mm, and the thickness of the electric components 8 is 0.8 mm.
9mm and 2.0mm, the total thickness is 5.5m
m.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a liquid crystal display device which is thinner while narrowing its frame.

[0011]

SUMMARY OF THE INVENTION The present invention provides a thin rectangular display frame to which a rectangular display panel is attached;
A first printed wiring board attached to the back side of the display panel along one side of the display panel around the display device frame and having a display data bus function; and a first print of the display panel around the display device frame. A second printed wiring board attached to the side surface of the display panel along one side to which the wiring board is attached and the other side adjacent to the display panel and having a scan data bus function; and a second printed wiring board arranged to overlap the second printed wiring board. And a third printed wiring board having an interface function, a control function, and a common drive function.

The first printed wiring board mounted on the back side of the display panel has a display data bus function, and the third printed wiring board has an interface function, a control function and a common drive function. Therefore, the first printed wiring board can be reduced in thickness, and the overall thickness can be reduced.

Further, since the third printed wiring board has electric components mounted on both sides, the size of the third printed wiring board located on the side surface of the display panel can be reduced, and the frame can be narrowed.

Further, the display panel has a matrix array substrate and a counter substrate facing the matrix array substrate, the periphery of the matrix array substrate protruding from the counter substrate, and a second printed wiring board and a third printed wiring board. The portion corresponding to the protruding portion of the matrix array substrate does not interfere with the protruding portion and has a shape overlapping in a plan view, and the side of the protruding matrix array substrate is also effectively used for the second print. Since the wiring board or the third printed wiring board can be provided, the thickness and the frame can be reduced.

Still further, a second printed wiring board smaller than the third printed wiring board is located on the same plane as the matrix array board, and a part of the third printed wiring board is located on the back side of the matrix array board. In general, the second printed wiring board, which can be mounted with fewer components than the third printed wiring board, may be smaller than the third printed wiring board, so that the thickness and the frame can be easily reduced.

Further, the first printed wiring board comprises:
The first printed wiring board, the second printed wiring board, and the third printed wiring board are provided with connection portions protruding so as to overlap at least one of the second printed wiring board and the third printed wiring board. Since a wiring board can be provided, downsizing can be achieved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the liquid crystal display device of the present invention will be described below with reference to the drawings.

The liquid crystal display device shown in FIGS. 1 and 2 has a flat rectangular display device frame 12 having an L-shaped cross section and a display opening 11 on the front surface.

Then, a liquid crystal display panel 13 is mounted facing the display opening 11, and the liquid crystal display panel 13 has a matrix array substrate 14 and a counter substrate 15 facing the matrix array substrate 14. The matrix array substrate 14 is larger than the opposing substrate 15, and the matrix array substrate 14 protrudes from the opposing substrate 15 in the plane direction.

On the back side of the liquid crystal display panel 13 along the long side of the display frame 12 to narrow the frame, an X-printed wiring board 16 as a first printed wiring board is provided. The X-printed wiring board 16 has only a display data bus function, and is electrically connected to the liquid crystal display panel 13 via the TAB 17. The TAB 18 projects in the longitudinal direction of the X-printed wiring board 16.

Further, along the short side of the display device frame 12,
Y-printed wiring board as second printed wiring board
An X-printed wiring board 19 is arranged at a position substantially at the same height as the matrix array substrate 14 in the display device frame 12 so as not to interfere with the matrix array substrate 14.
The Y-printed wiring board 19 has a power supply function and a scanning data bus function.

Further, the Y-printed wiring board 19 is provided under the Y-printed wiring board 19 so as to overlap with the Y-printed wiring board 19.
An interface printed wiring board 20 serving as a third printed wiring board having a larger planar shape than the printed wiring board 19 is disposed so as to be partially located below a portion of the matrix array substrate 14 protruding from the counter substrate 15; Electrical components 21, 21 are mounted on both sides of the interface printed wiring board 20, and the interface printed wiring board 20 has an interface function, a control function,
Equipped with common drive function and power supply function.

As described above, in the case of the liquid crystal display device shown in FIGS. 1 and 2, the functions are shared by the X-printed wiring board 16, the Y-printed wiring board 19 and the interface printed wiring board 20. Therefore, each can be miniaturized, the plane can be made small for narrowing the frame, and the X-printed wiring board 16 and the Y-printed wiring board 19 can be reduced.
In addition, the thickness of the interface printed wiring board 20 can be reduced.

More specifically, for example, the thickness of the portion of the liquid crystal display panel 3 which does not overlap the Y-printed wiring board 19 is 1.0 mm, and the thickness of the Y-printed wiring board 19 is 0.4
mm and the thickness of the electric components 21 and 21 are 1.0 mm and 2.0 mm, respectively, and the entire thickness can be reduced to 5.0 mm.

The same effect can be obtained by mounting the power supply circuit function on the Y-printed wiring board 19 instead of the interface printed wiring board 20.

[0026]

According to the present invention, the first printed wiring board attached to the back side of the display panel has a display data bus function, and the third printed wiring board has an interface function, a control function and a common function. Since the first printed wiring board is provided with a driving function, the thickness of the first printed wiring board can be reduced, and the thickness can be reduced as a whole.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a liquid crystal display device of the present invention.

FIG. 2 is a perspective view showing the same from the back side.

FIG. 3 is a cross-sectional view illustrating a conventional liquid crystal display device.

FIG. 4 is a perspective view showing the same from the back side.

[Explanation of symbols]

12 Display device frame 14 Matrix array substrate 15 Counter substrate 16 X-printed wiring board as first printed wiring board 19 Y-printed wiring board as second printed wiring board 20 Interface as third printed wiring board Printed wiring board

Claims (5)

[Claims] 1. A thin rectangular display device frame to which a rectangular display panel is attached, and a display data bus function attached to the back side of the display panel along one side of the display panel around the display device frame. A first printed wiring board having a scanning data bus function attached to a side surface of the display panel along one side of the display panel around the display device frame and the other side adjacent to the one side of the display panel where the first printed wiring board is mounted; A liquid crystal, comprising: a second printed wiring board having: a third printed wiring board having an interface function, a control function, and a common driving function, the third printed wiring board being provided so as to overlap with the second printed wiring board. Display device. 2. The liquid crystal display device according to claim 1, wherein the third printed wiring board has electric components mounted on both sides. 3. A display panel comprising a matrix array substrate and a counter substrate facing the matrix array substrate, wherein a periphery of the matrix array substrate protrudes from the counter substrate, and wherein a second printed wiring board and a third printed wiring board are provided. 3. The liquid crystal display device according to claim 1, wherein a portion corresponding to the protruding portion of the matrix array substrate does not interfere with the protruding portion and has a shape overlapping in a plan view. 4. A second printed wiring board smaller than the third printed wiring board is located on the same plane as the matrix array board, and a part of the third printed wiring board is located on the back side of the matrix array board. The liquid crystal display device according to claim 3, wherein: 5. The printed circuit board according to claim 1, wherein the first printed circuit board includes a connecting portion protruding so as to overlap at least one of the second printed circuit board and the third printed circuit board. The liquid crystal display device according to any one of the above.