JPH0274984A - Flat panel type display device - Google Patents

Abstract

PURPOSE:To miniaturize a panel part even in the case of a high definition and a high picture element number, and also, to obtain a desirable external appearance by forming a train driving integrated circuit to plural stages and mounting it in a roughly orthogonal plane against the surface of a display cell. CONSTITUTION:As a connecting part of each one end of a flexible printed board 13b constituted in a three-stage lap comes near an outside peripheral edge part of a TFT (thin film transistor) array substrate 11a, a connecting part of each other end thereof is positioned on the upper side of a bending part 14a, and a source driving IC 12b is mounted in a three-stage lap in a roughly orthogonal plane against a liquid crystal cell 11. Also, a film carrier 13a is connected to an IC input flexible printed board 14, and a gate driving IC 12a is also connected to its IC input bus line, and mounted into its same plane of the periphery of the liquid crystal cell 11. In such a way, by mounting that of a high picture element number and a multi-terminal with high density, the panel part can be miniaturized, and also, a ratio of an area occupied by a display area of the front of the panel can be taken large and that which is desirable in its external appearance is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a flat panel display device such as a liquid crystal display device, and particularly relates to an improvement in the mounting part of a drive integrated circuit (hereinafter referred to as a drive IC). It is something.

[Conventional technology]

FIG. 6 is a diagram showing the structure of a conventional liquid crystal display device disclosed in, for example, Japanese Unexamined Patent Publication No. 59-210419. In the figure, 1a is a TFT having a thin film transistor (hereinafter referred to as TPT) array. The array substrate, 1b is a counter substrate, and these constitute the liquid crystal cell 1.

2a is a gate drive IC 12b is a source drive IC, and their output signals are supplied to the liquid crystal cell 1 via wiring on flexible substrates 3a and 3b. Reference numeral 4 denotes a printed circuit board which transmits control signals for the bibliometric ICs 2a and 2b such as drain power supply voltage VDD% source power supply voltage VI5, clocks, and video signals.

FIG. 7 is a sectional view showing the wiring section of a conventional liquid crystal display device disclosed in, for example, Japanese Utility Model Application Publication No. 61-126226.
directly connected to C and connected to TF via flexible board 3d.
It is connected to the T array substrate 1a. The three source drive ICs 2b in the figure are for each color of the color filter [red (R),
green (G) and blue (B)], and the terminal portion of the TFT array substrate 1a has terminals arranged in multiple stages on a plane corresponding to each color of the color filter.

[Problem to be solved by the invention]

Since the conventional flat panel display device is configured as described above, in the structure shown in FIG.
, 2b are arranged on the same plane as the liquid crystal cell 1, the area of the non-display area around the outside becomes larger than the effective display area, which not only makes it impossible to downsize, but also makes the display area larger than the display screen. The peripheral area occupies a large proportion of the visual field, creating an unfavorable appearance. Furthermore, in the structure shown in FIG. 7, since the control signal wiring for the source drive ICZb is independent for each of the three printed circuit boards Fi3C, it is necessary to redundantly wire the signal line common to the three source drive ICs 2b. Furthermore, when multiple stacked source drive TCs 2b are mounted in a device having the structure shown in FIG. 6 as shown in FIG. 7, a protrusion occurs in the thickness direction of the liquid crystal cell 1. , there were issues such as the inability to downsize.

This invention has been made to solve the above-mentioned problems, and aims to provide a flat panel display device that can have a compact panel section even with high definition and a high direct prime number, and is favorable in terms of appearance. .

[Means to solve the problem]

The flat panel display device according to the present invention has a plurality of column drive integrated circuits mounted in a plane substantially perpendicular to the display cell surface.

[For production]

In the flat panel display device of the present invention, the column drive integrated circuits are not mounted on the front surface of the panel, but are mounted in multiple stages in a plane substantially orthogonal to the display cell surface, so the effective display area is thicker than the non-display area. , which is preferable in terms of appearance and can be downsized.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is an assembly diagram showing the mounting structure of a flat panel display device according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional view of FIG. 1 when viewed from the side from arrow A, and FIG. In FIGS. 1 to 3, which are partial cross-sectional views when viewed from the side from arrow B perpendicular to the arrow, lla represents TPT for each pixel.
and a row with a transparent pixel electrode connected to the drain electrode of this,
A TFT array substrate on which column wiring is formed, llb is a counter substrate on which a color filter and a counter electrode are formed, an alignment film is further formed on the TFT array substrate 11a and the counter substrate 11b, and a liquid crystal is further formed between them. A well-known liquid crystal cell 11 is constructed by sandwiching the layers. 12a is T
FT array board! ! Each film carrier 13 is connected to the gate drive IC connected to the gate electrode of the TPT a, and is connected to the vicinity of the pair of opposing sides of the TFT array substrate 11a.
It is connected to a by gang bonding or wire bonding. 12b is the TFT array substrate 11
12bR, 12bG, and 12bB are each R (red) in the source drive IC connected to the source electrode of TFT a.
, G (green), and B (blue) pixels. Reference numeral 13b denotes a flexible printed circuit board whose one end side is connected to the vicinity of the other pair of opposite sides of the TFT array substrate 11a.
It is stacked in layers. 14 is a flexible printed IJ board for IC manual operation on which an IC input bus line is formed, and its opening is aligned with the display surface of the liquid crystal cell 11, and the resin body 1 is
7 to the lower surface of the TFT array substrate 11a of the liquid crystal cell 11, and has a bent portion 14a bent in a direction substantially perpendicular to the liquid crystal cell 11 near the connection portion with the source driving IC 12b. The other end of the flexible printed circuit board 13b is connected to this bent portion 141. Thereby, the source drive IC 12b is connected to the IC input bus line of the flexible printed circuit board 114 for IC input. The closer the connecting portions at one end of the three-layered flexible printed circuit boards 13b are to the outer peripheral edge of the TFT array substrate 11a, the more the connecting portions at the other ends are located above the bent portion 14a, and The drive ICs 12b are stacked in three stages and mounted in a plane substantially orthogonal to the liquid crystal cell 11. or,
The film carrier 13a is also connected to the IC input flexible printed circuit board 14, and the gate drive IC 12a is also connected to the IC input bus line and mounted around the liquid crystal cell 11 in the same plane. 15 is a bank light that illuminates the liquid crystal cell 11 from the side of the flexible printed circuit board 14 for IC input; 16 is arranged behind this backlight 15;
This is a control signal board connected to the C input bus line. Note that polarizing plates (not shown) are provided to sandwich the liquid crystal cell 11 as necessary.

FIG. 4 is an explanatory view showing the color arrangement of pixels in a matrix and the terminal lead lines of the liquid crystal cell in this embodiment, and FIG. 5 is a plan view showing the shape of the terminals.

4 and 5, 18a is a gate drive ICl
18b is a source wiring electrode terminal connected to the source driving IC 12b, and 18b is a source wiring electrode terminal connected to the source driving IC 12b. Terminals 18bR, 18bG, and 18bB are provided to be connected to terminals 12bG and 12bB, respectively. Dummy terminals tsc and tact are provided on the opposite side of the gate wiring electrode terminal 18a and the source wiring electrode terminal 18b.
is provided. 19 is a pixel, in which R, G, and B are alternately arranged in columns, and R, G, and B are alternately arranged in each row. The source wires constituting the signal column line (column wire) are drawn out in a staggered manner with the pixels 19 in between every three wires, and are connected to the source wire electrode terminal 18b. Scanning signal row line (
The gate wiring constituting the pixel 19 (row wiring)
Each book is drawn out in a staggered manner and connected to the gate wiring electrode terminal 18a. Note that the source wiring electrode terminals 18b are arranged in three stages corresponding to the three primary colors of the pixel 19.

Since the source wiring and the gate wiring are drawn out in a staggered manner, the pinch of the electrode terminal can be increased when connecting to the film carrier 13a or the flexible printed circuit board 13b, improving the reliability and yield of the connection. .

In addition, the dummy terminals 18c and 18d are used as blowing pads when inspecting defects (such as disconnection inspection) of the gate wiring and the source wiring, and are also used as blowing pads when the gate wiring or the source wiring is inside the liquid crystal cell II. It is used as a redundant terminal pad for inputting a drive signal from the opposite side to the electrode terminal to avoid drive failure due to line defects in the event of wire breakage.

Next, the operation will be explained with reference to FIGS. 1 to 3. The drive IC control signal generated by the control signal board 16 is transmitted to the IC input bus line of the flexible printed circuit board 14 for IC input. Among them, the gate drive IC control signal is
The signal is transmitted to the gate drive l012a via the film carrier 13a. A gate drive signal as a scanning drive signal output from the gate drive IC 12a is supplied to the liquid crystal cell 11 via the film carrier 13a. Also, source driven IC$! The Nil signal is passed through the IC input bus line of the IC input flexible printed circuit board 14 to the flexible printed circuit board 13b and then to the source driving IC 12b.
transmitted to. A source drive signal as a display drive signal output from the source drive IC 12b is supplied to each pixel of the liquid crystal cell 11 via the flexible printed circuit board 13b.

By supplying the gate drive signal and the source drive signal to the TPTs in the liquid crystal cell ll, the energization/de-energization of these TPTs is controlled, and the illumination from the backlight 15 controls the energization/de-energization of the TPTs. Display tomato links. Note that when the source drive IC 12b drives the TPT via the source wiring, the source wiring is used in three columns on each side of the pixel 19, a total of six columns on both sides, as shown in FIGS. 4 and 5. The clock required by the source drive ICI 2b has a large number of 0 pixels, which can be reduced to one-sixth of the conventionally required clock frequency, and the clock frequency is a high frequency clock of, for example, 30 MHz. Even if conventionally required, the clock frequency of the source drive ■Cl2b according to this embodiment is 5
? As the frequency is as low as 1Hz, the range of choices of drive ICs that can be used is widened.

In the above embodiment, the bent portion 14a is connected to the liquid crystal cell 11.
Although it is bent to the opposite side, it may be bent to the liquid crystal cell 11 side.

Further, in the above embodiment, a TPT-driven active matrix liquid crystal display device was described as a display device, but
A liquid crystal display device driven by a two-terminal element such as an MIM (metal insulator metal) method, or a passive matrix type (don't matrix type) liquid crystal display device that does not incorporate an active element may be used, and the same method as in the above embodiment may be used. be effective.

Further, the display device does not have to be a liquid crystal display, and may be another flat display (FL type display device) such as a plasma display or an electroluminescence display.

〔Effect of the invention〕

As described above, according to the present invention, column drive integrated circuits are arranged in multiple stages and mounted in a plane substantially orthogonal to the display cell surface, so devices with a high number of pixels and many terminals can be mounted at high density. This has the effect that it can be made smaller, and that the proportion of the area occupied by the display area on the front of the panel can be increased, resulting in a more pleasing appearance.

[Brief explanation of the drawing]

FIG. 1 is an assembly diagram of a device according to an embodiment of the present invention, and FIG.
Figures 3 and 3 are partial cross-sectional views of Figure 1 when viewed from each side, Figure 4 is an explanatory diagram showing the relationship between pixel color wiring and terminal lead lines, and Figure 5 is the terminal of Figure 4. 6 is a structural diagram showing the mounting structure of the conventional device, and FIG. 7 is a sectional view showing the bag structure of another conventional device. In IEI, 11...Liquid crystal cell, lla...TFT array substrate, llb...Counter substrate, 12a...Gate drive rc, 12b...Source% IKMIC, 13a.
...Film carrier, 13b...Flexible printed circuit board, 14...Flexible print I for IC input
IJ board, 14a...Bending portion, 15...Backlight, 16...Control signal board. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] Row wiring and column wiring are provided on the substrate constituting the display cell, and a scanning drive signal is supplied to the row wiring, and a display driving signal is supplied from each column driving integrated circuit to each of the column wiring to perform dot matrix display. In the display device, an input bus line for transmitting integrated circuit control signals is formed, and a bent portion is bent approximately at right angles to the display cell surface near the wiring connection portion with the column drive integrated circuit. a flexible printed circuit board for input, each carrying the column drive integrated circuit, and connected in multiple stages between the board and the bent part to connect the column drive integrated circuit to the column wiring and the input. 1. A flat panel display device comprising: a flexible printed circuit board connected between a bus line and a flexible printed circuit board, wherein the column drive integrated circuit is mounted in a plurality of stages in a plane substantially orthogonal to the display cell surface.