JPH0784278A - Liquid crystal display panel - Google Patents

Abstract

PURPOSE:To facilitate inspection for wirings and more particularly short circuit inspection with the liquid crystal display panel formed by packing a liquid crystal into the opposite spacing of a pair of transparent substrates, regularly forming many pieces of wirings for driving pixels on at least either of a pair of the transparent substrates and mounting IC chips for outputting pixel driving signals to the wirings. CONSTITUTION:Many pieces of conductor patterns 8-1', 8-2' extending from one side end of the wirings 7 for pixel driving and having junctures 8-1', 8-2' to the IC chips 6 and terminals 12 for inspection extending from the IC chip junctures 8-2' of the conductor patterns 8-2 of the even numbered places (or the conductor patterns 8-1 of the odd numbered places) are formed on the transparent substrate 2 formed with the wirings 7 for pixel driving. The terminals 12 for inspection are positioned within the IC chip mounting region B outside the opposite regions of a pair of the transparent substrates 2, 3. Further, the terminals for inspection extending outside the opposite regions of a pair of the transparent substrates, 2, 3 from the other ends of the conductor patterns 8-1 are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel having an IC chip for driving pixels, and more particularly to a structure for facilitating inspection of wirings for driving pixels.

[0002]

2. Description of the Related Art A liquid crystal display panel (LCD), such as an active element (TF), in which liquid crystal is filled in a gap between a pair of transparent substrates.
In a TFT-LCD in which a thin film transistor (T) is operated to apply a predetermined voltage (drive signal) to the display electrodes, one end of a large number of bus lines (wiring) connected to a large number of TFTs is for pixel drive It is connected to the IC chip.

Therefore, a conductor pattern whose one end is connected to the bus line and the other end is connected to the output electrode of the IC chip is formed on the surface of the display panel transparent substrate on which the pixel driving IC chip is mounted.

In such a conductor pattern, one end has the same pitch as the bus line (for example, about 100 μm), and the other end has the same pitch as the output electrode of the IC chip (for example, 50 to 70 μm).
The bus line disconnection inspection and the adjacent bus line short circuit inspection should be performed by stacking a pair of transparent substrates for display panels and filling the gaps with liquid crystal, and then contacting the conductor pattern with an inspection probe or the like. become.

FIG. 6 is an explanatory view of a schematic structure of a conventional liquid crystal display panel. (A) is a partially cutaway plan view and (b) is a plan view.
It is an enlarged detailed view of the A section in (a). In FIG.
The liquid crystal display panel 1 includes a pair of transparent (glass) substrates 2 and 3
Are opposed to each other with a predetermined gap, and the liquid crystal 5 is filled in the gap whose periphery is sealed by the sealing material 4, and the IC chip 6 is generally C
It is mounted on the substrate 2 by a technique called OG (Chip on Glass).

On the surface of the glass substrate 2 on which a plurality of driving IC chips 6 are mounted in the vicinity of the two ends, the glass substrate 2 shown in FIG.
As shown in (b), a conductor pattern 8 for connecting the plurality of wiring lines 7 for driving pixels formed on the substrate 2 and the IC chip 6 and a conductor terminal 9 for connecting the IC chip 6 to an external circuit are provided. The connecting portion 8'of the conductor pattern 8 formed and connected to the IC chip 6 and the tip portion of the conductor terminal 9 are formed within the IC chip mounting area B shown by a chain line.

In such a liquid crystal display panel 1, it is necessary to inspect the wiring 7 for disconnection and short circuit before mounting the IC chip 6 in order to confirm the display quality. The disconnection inspection of the wiring 7
All the wirings 7 are inspected at the same time with one end of a large number of the wirings 7 connected in a short-circuited manner. For the short-circuiting inspection of the wirings 7, an electrically specialized probe is attached to each conductor pattern 8.
It is preferable to make contact with the connecting portion 8 ', where some scratches can be ignored.

However, as the pitch of the wiring 7 becomes higher than about 100 μm as the pixel becomes finer and the pitch of the output electrodes becomes high at about 50 μm due to the high performance and miniaturization of the IC chip 6, the conductor pattern becomes It becomes extremely difficult to bring the probe for inspection into contact with 8.

[0009]

As described above, the conventional liquid crystal display panel is a liquid crystal display panel, a driving I
When the conductor pattern 8 and the connecting portion 8'become higher in density as the performance of the C chip becomes higher, the inspection probe having spring elasticity also becomes higher in density, and the short-circuit inspection of the display wiring 7 becomes very difficult. However, there is a problem in that

[0010]

In a liquid crystal display panel having a driving IC chip mounted thereon, it is possible to cope with high density of a pixel driving wiring and an output electrode of the driving IC chip, and to easily perform wiring disconnection inspection and short circuit inspection. According to the present invention for smoothing, according to FIG. 1, a liquid crystal 5 is filled in a facing gap between a pair of transparent substrates 2 and 3, and at least one of the pair of transparent substrates 2 and 3 has a large number of liquid crystals. In the liquid crystal display panel 11 in which the pixel driving wiring 7 is regularly formed, and the IC chip 6 for outputting the pixel driving signal is mounted on the wiring 7.
On the transparent substrate 2 on which the wiring 7 is formed, a large number of conductor patterns 8 _-1 , 8 _-2 extending from the wiring 7 and having connection portions 8 _-1 ′, 8 _-2 ′ with the IC chip 6, The even-numbered (or odd-numbered) conductor pattern 8 _-2 is formed with an inspection terminal 12 extending from the IC chip connection portion 8 _-1 ′, and the inspection terminal 12 is a region where the pair of transparent substrates 2 and 3 face each other. It is characterized in that it is arranged in the outer IC chip mounting area B.

[0011]

In the liquid crystal display panel of the present invention, the inspection terminal extends at least from the IC chip connection end of the even-numbered (or odd-numbered) conductor pattern into the IC chip mounting area. Therefore, in the short circuit inspection of the pixel drive wiring performed through the conductor pattern, a large number of probes are arranged in a staggered pattern,
That is, the probes contacting the inspection terminals and the probes contacting the IC chip connection ends can be arranged in a staggered manner, and the inspection probes can be easily contacted with the high-density conductor pattern.

[0012]

1 is an explanatory view of a schematic structure of a liquid crystal display panel according to an embodiment of the present invention, FIG. 2 is an explanatory view of a wiring inspection method of the liquid crystal display panel shown in FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 5 is a plan view showing a schematic configuration of a liquid crystal display panel according to an embodiment, FIG. 4 is a detailed explanatory view of a pixel display wiring inspection terminal shown in FIG.
FIG. 3 is an explanatory diagram of an example of mounting an IC chip on a liquid crystal display panel according to the present invention.

FIG. 1 using the same reference numerals as those in FIG.
In (a), a partially broken plan view, (b) is an enlarged detailed view of a portion A in (a), and the liquid crystal display panel 11 is
A pair of transparent (glass) substrates 2 and 3 face each other with a predetermined gap,
The liquid crystal 5 is filled in the gap whose periphery is sealed with the sealing material 4.

A plurality of pixel driving wirings (bus lines) 7 and IC chips 6 are provided on the surface of the glass substrate 2 on which a plurality of driving IC chips 6 are mounted near the two ends.
And the conductor patterns 8 _-1 and 8 _-2 that connect the wiring 7 to the wiring 7,
Conductor terminals 9 for connecting the IC chip 6 to an external circuit are formed.

The plurality of conductor patterns 8 _-1 and 8 _-2 corresponding to the common IC chip 6 and having a fan shape as a whole are alternately arranged in the alignment direction, and odd-numbered (or even-numbered) in the alignment direction. conductor patterns _28-1 of the front end portion _28-1 'of th), odd when although terminating, the even-numbered (conductive pattern 8 _-1 of the even-numbered in the conventional conductive pattern 8 and also the IC chip mounting area B ) In the tip portion 8 _-2 ′ of the conductor pattern 8 _-2 ), an inspection terminal 12 extending in the IC chip mounting area B is formed.

The disconnection inspection of the wiring 7 formed on the substrate 2 as described above is performed by the same method as the conventional method, for example, as shown in FIG. 2, one for all the conductor patterns 8 _-1 and 8 _-2 connected to the same IC chip 6. The conductive rubber 13 of
A predetermined drive voltage is applied to all the pixels via, and the wiring 7 that is broken in the middle is determined by not lighting up from the broken portion.

The short-circuit inspection of the wiring 7 to which the conductor patterns 8 _-1 and 8 _-2 are connected is performed by, for example, a probe card in which the probes are arranged in a staggered pattern, that is, the tip portion 8 _-1 'of the conductor pattern 8 _-1.
The probe card in which the probe contacting with the probe and the probe contacting with the inspection terminal 12 are alternately arranged is used, and a predetermined voltage is selectively applied to each wiring 7, and the wiring 7 is turned on when no voltage is applied. Determined by the presence or absence.

FIG. 3 using the same symbols as those in FIG.
In, the liquid crystal display panel 16 is a pair of transparent (glass)
The substrates 2 and 3 are opposed to each other with a predetermined gap, and the liquid crystal 5 is filled in the gap whose periphery is sealed with the sealing material 4.

However, the transparent substrate 2 of the panel 16 is slightly larger than the substrate 2 of the above-mentioned embodiment, the space for mounting the driving IC chip 6 is exposed on two sides of the surface, and the other two sides will be described later. The space for forming the terminal 17 to be exposed is exposed.

In FIG. 4 showing the cross-sectional area C surrounded by the one-dot chain line in FIG. 3, conductor patterns 8 _-1 and 8 _-2 for connecting the wiring 7 and the IC chip 6 are provided near one end of the substrate 2. Also, a conductor terminal 9 for connecting the IC chip 6 to an external circuit is formed, and a conductor pattern 8 is formed near the other end of the substrate 2.
An inspection terminal 17 extending from the wiring 7 on which _-1 is formed is formed.

The plurality of conductor patterns 8 _-1 and 8 _-2 , which correspond to the common IC chip 6 and have a fan shape as a whole, are arranged alternately in the alignment direction, and are arranged in odd numbers (or even numbers) in the alignment direction. connection 8 of the conductive pattern 8 _-1 th) _-1 ', like the conventional conductive pattern 8 although terminating in IC chip mounting region B, the connection portion 8 of the even-numbered conductor pattern _{8-2 2'}
The inspection terminals 12 extending into the IC chip mounting area B.
Are formed.

In such a liquid crystal display panel 16, the disconnection inspection of the wiring 7 is performed by the same method as the conventional method, for example, all conductor patterns 8 connected to the same IC chip 6 as shown in FIG.
_-1 and 8 _-2 , one conductive rubber 13 is overlaid, and a predetermined drive voltage is applied to all pixels through the wiring 7 and the conductive rubber 13 to make a determination. Wiring 7 that is in contact with terminals 12 and 17 by inspecting probes and selectively applies a predetermined voltage to each wiring 7, and that lights up even when no voltage is applied.
Determined by the presence or absence of.

In FIG. 5, (a) is a side view of the IC chip 6 mounted on the substrate 2 using an anisotropic conductive resin,
(B) It is a side view when the IC chip 6 is mounted on the substrate 2 using a metal bump.

In FIG. 5 (a), 21 is an electrically insulating adhesive material, 22 is a conductive particle mixed in the adhesive material 21, and is a connecting portion 8 _{-1 of the} conductor patterns 8 _-1 , 8 _-2. ′, 8 ₋₂ ′ and the output electrode 25 of the IC chip 6, and the conductor terminal 9 and the input electrode 26 of the IC chip 6 are electrically connected by sandwiching the conductive particles 22, but The inspection terminal 12 having no connection partner on the IC chip 6 is electrically floated (not connected).

In FIG. 5 (b), in which the same reference numerals are used for the same parts as in FIG. 5 (a), 23 is a metal bump, 24 is an electrically insulating adhesive material, and the conductor patterns 8 _-1 , 8 _-2 The connection parts 8 _-1 ′ and 8 _-2 ′ of the IC chip 6 and the output electrode 25 of the IC chip 6, and the conductor terminal 9 and the input electrode 26 of the IC chip 6 are the metal bumps 23.
Will be electrically connected by the
12 is in an electrically floating state like that of Fig. 5 (a).

[0026]

As described above, according to the present invention, when inspecting a wiring having a high density, the probes to be brought into contact with the wiring can be arranged in a staggered manner, which facilitates the inspection work and a liquid crystal display. It has the effect of contributing to the improvement of panel productivity.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a schematic configuration of a liquid crystal display panel according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a wiring inspection method for the liquid crystal display panel shown in FIG.

FIG. 3 is a plan view showing a schematic configuration of a liquid crystal display panel according to another embodiment of the present invention.

FIG. 4 is a detailed explanatory view of a pixel display wiring inspection terminal shown in FIG.

FIG. 5 is an explanatory diagram of an example of mounting an IC chip on a liquid crystal display panel according to the present invention.

FIG. 6 is an explanatory diagram of a schematic configuration of a conventional liquid crystal display panel.

[Explanation of symbols]

2, 3 Transparent substrate 5 Liquid crystal 6 IC chip 7 Wiring for driving pixels 8 _-1 , 8 _-2 Conductor pattern, odd number 8 _-1 ', 8 _-2 ' Conductor pattern IC chip connection part 11,16 Liquid crystal display panel 12 , 17 Wiring inspection terminal B IC chip mounting area

Claims (2)

[Claims] 1. A liquid crystal in a gap between a pair of transparent substrates (2, 3) facing each other.
(5) is filled with at least one of the pair of transparent substrates (2)
In the liquid crystal display panel, a large number of pixel driving wirings (7) are regularly formed, and an IC chip (6) for outputting a pixel driving signal is mounted on the wirings (7). On the transparent substrate (2) on which (7) is formed, the wiring (7)
Connection parts (8 _-1 ′, 8 _-2 ′) extending further and connecting to the IC chip (6)
A plurality of conductor patterns (8 _-1 , 8 _-2 ), and an inspection terminal (12) extending from the IC chip connection portion of the odd-numbered or even-numbered conductor pattern are formed. (12) is I outside the facing region of the pair of transparent substrates
A liquid crystal display panel characterized by being located in the C chip mounting area (B). 2. A liquid crystal in a gap between a pair of transparent substrates (2, 3) facing each other.
(5) is filled with at least one of the pair of transparent substrates (2)
A large number of pixel drive wires (7) are regularly formed on the
And an IC chip that outputs a pixel drive signal to the wiring (7).
In a liquid crystal display panel on which the wiring (7) is mounted, the wiring (7) is formed on the transparent substrate (2) on which the wiring (7) is formed.
Connecting part extending from one side end to the IC chip (6)
(8_-1′, 8_-2′) Multiple conductor patterns (8_-1,
8 _-2) Of the odd or even conductor pattern
First inspection terminal (12) extending from the IC chip connection part
And the other side of the wiring (7) where the first inspection terminal does not extend
A second inspection terminal (17) extending from the end is formed, and the first inspection terminal (12) is located in the opposing region of the pair of transparent substrates.
Located in the outside IC chip mounting area (B),
Terminals (17) are located outside the opposing regions of the pair of transparent substrates
A liquid crystal display panel characterized by: