JP2002250929A - Mother substrate for reflection type liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mother substrate for a reflection type liquid crystal display panel in which a spacer is uniformly disposed to make the gap uniform. SOLUTION: A dummy electrode 13 connected to a transparent electrode 4a and a protruding part 9 extending from a metal film 7 are disposed in the position corresponding to the region 8 where no panel is to be formed of a liquid crystal display panel 10, and the dummy electrode 13 is electrically connected to the protruding part 9 through a connecting hole 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motherboard for a reflection type liquid crystal display panel for producing a reflection type liquid crystal display panel for displaying by reflecting light incident from the outside.

[0002]

2. Description of the Related Art Generally, a liquid crystal display device for displaying information such as a specific figure or character is widely used as a display device of a computer, a mobile phone or the like.

This liquid crystal display device includes a liquid crystal display panel for selectively applying a voltage to a predetermined portion of a pair of transparent substrates filled with liquid crystal in the middle to display information such as specific figures and characters. Built-in.

Further, as one type of the liquid crystal display panel,
In recent years, because a backlight unit is not required, the display can be performed by reflecting light incident from the outside for reasons such as lower power consumption, thinner, lighter, and lower cost of the liquid crystal display device. The reflection type liquid crystal display panel to be used is frequently used.

[0005] Further, in general, since a plurality of liquid crystal display panels are simultaneously formed, in the production of the liquid crystal display panels,
A motherboard for a liquid crystal display panel on which a plurality of panel formation regions are formed is used. Then, a pair of liquid crystal display panel mother substrates are bonded together via a sealing material provided around each panel forming region, and cut so as to expose an injection port formed by the sealing material. Is enclosed. Then, individual liquid crystal display panels are formed by separating and separating the portion located in the panel formation region.

FIG. 3 shows a conventional reflection type liquid crystal display panel 20.
FIG. 4 is a vertical partial cross-sectional view showing one example, as shown in FIG.
The reflective liquid crystal display panel 20 is provided with a pair of transparent substrates 21 facing each other. The transparent substrate 21a on the rear surface side of the transparent substrate 21b on the upper surface side in the figure which is the observer side
A transparent electrode 23b and an alignment film (not shown) are laminated on the surface facing the substrate. Further, a metal thin film 25 is formed on the surface of the transparent substrate 21 a on the back side, and an insulating film 26 is formed on the surface of the metal thin film 25. Further, the surface of the insulating film 26 has a transparent electrode 23
a and an alignment film (not shown) are laminated, and a polarizing plate 22 is disposed on the surface of the transparent substrate 21b on the front side. The peripheral portions of the pair of transparent substrates 21 are integrally formed by being surrounded by a sealing material (not shown).
The spacers 28 for adjusting the gap are uniformly dispersed and the liquid crystal 29 is sealed.

In the method of manufacturing the reflection type liquid crystal display panel 20, first, a mother board 30b on the front side and a mother board 30a on the back side are formed. Mother board 30b on the front side
Is formed by patterning a transparent electrode 23b made of a transparent conductive film at a position corresponding to a panel formation region of a liquid crystal display panel, applying an alignment film material such as polyimide so as to cover the transparent electrode 23b, and rubbing it. To form an alignment film. Also, the mother board 3 on the back side
0a, a metal thin film 25 serving as a reflective layer is formed at a position corresponding to a panel formation region, an insulating film 26 is formed on the surface of the metal thin film 25, and a transparent conductive film made of a transparent conductive film is formed on the surface of the insulating film 26. The electrode 23a is formed by patterning, and an alignment film material such as polyimide is applied so as to cover the surface of the transparent electrode 23a, and is rubbed to form an alignment film.

Then, a sealing material is applied to the periphery of the panel forming area of the mother board 30b on the front side, and the spacer 28 is formed on the surface of the mother board 30a on the back side by dry spraying.
And the mother substrates 30a and 30b are bonded together so that the transparent electrodes 23a and 23b face each other. Thereafter, in order to expose the injection port provided in advance with a sealing material, the bonded mother substrates 30a and 30b are cut, and liquid crystal is injected from the injection port, and then the injection port is sealed. Then, after a portion of each liquid crystal display panel located in the panel formation region is divided to form an individual liquid crystal display panel, a polarizing plate 22 is adhered to the surface of the transparent substrate 21b to form a reflective liquid crystal display panel 20. I do.

[0009]

However, the metal thin film 25 and the insulating film 2 which are sequentially laminated on the surface of the transparent substrate 21a on the back side constituting the reflection type liquid crystal display panel 20 are described.
6. The configuration of the transparent electrode 23a forms a kind of capacitor and promotes charging. Therefore, the mother substrate 30 on the back side charged by rubbing when forming the alignment film is formed.
When the spacers 28 are sprayed on a by a dry spraying method, a phenomenon occurs in which the spacers 28 cohere along the transparent electrodes 23, and the gap between the pair of substrates is not uniform.

When a liquid crystal having a high specific resistance is used to keep the alignment state of the liquid crystal 29 constant, when the liquid crystal 29 is injected between a pair of transparent electrodes 23, the mother substrate 30a is charged by charging. The liquid crystal 29 may be in a state where a voltage is applied between the transparent substrates 21, that is, a lighting state, even though no current is applied between the transparent electrodes 23.

The present invention has been made in view of these points, and it is possible to arrange spacers uniformly and to make the gap uniform, thereby making it possible to perform accurate measurement. An object is to provide a motherboard for a panel.

[0012]

According to a first aspect of the present invention, there is provided a motherboard for a reflection type liquid crystal display panel, comprising a metal film formed at a position corresponding to a panel formation region of the liquid crystal display panel. In a mother substrate for a reflective liquid crystal display panel in which an insulating film and a transparent electrode are sequentially laminated, a dummy electrode connected to the transparent electrode and the metal film extend from a position corresponding to a non-panel forming region of the liquid crystal display panel. The dummy electrode and the projection are electrically connected to each other through a conductive means.

According to the first aspect of the present invention, the metal film and the transparent electrode can be electrically connected.
By setting the potential of the metal film and the potential of the transparent electrode to be the same, the charging of the mother substrate for the reflective liquid crystal display panel can be easily removed. In addition, the dummy electrodes of the transparent substrate are filled with liquid crystal between the mother substrate for the reflective liquid crystal display panel and the mother substrate on the front surface side, and are simultaneously removed when the mother substrate is divided.

According to a second aspect of the present invention, there is provided a motherboard for a reflection type liquid crystal display panel, wherein the conduction means includes a connection hole penetrating the insulating film in a thickness direction, and an inner surface of the connection hole is transparent. It is characterized by being covered with a transparent conductive film forming an electrode.

According to the second aspect of the present invention, since the metal film and the transparent electrode can be electrically connected by the connection hole, the potential of the metal film and the potential of the transparent electrode are made equal. Thereby, charging of the mother substrate for the reflective liquid crystal display panel can be prevented.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 is a schematic plan view showing an embodiment of a mother substrate 1a for a reflection type liquid crystal display panel according to the present invention.
The mother substrate 1a of the present embodiment has 3 (columns) × 4 (rows).
12 panel forming areas 6 are allocated. The portion other than the panel forming region 6 becomes the non-panel forming region 8. FIG. 1 is a conceptual longitudinal sectional view showing an embodiment of a reflective liquid crystal display panel 10 using a mother substrate 1 according to the present invention. FIG. 2 is a plan view showing the vicinity 6 of a panel forming region of the one-reflection type liquid crystal display panel 10 formed on the mother substrate 1a for a reflection type liquid crystal display panel according to the present invention.

A metal thin film 7 is formed in a panel formation region 6 of the mother substrate 1a for the reflection type liquid crystal display panel on the back side, and extends from one corner of the metal thin film 7 to a non-panel formation region 8. A protruding portion 9 is formed.

An insulating film 11 is formed on the surface of the metal thin film 7 so as to cover the metal thin film 7.
At a position corresponding to the panel forming region 6 on the surface of the insulating film 11, a plurality of transparent electrodes 4a arranged in parallel in a certain direction are laminated and formed so as to extend to the non-panel forming region 8. ing. On the other hand, at a position corresponding to the non-panel forming region 8 on the surface of the insulating film 11, the dummy electrode 13 is orthogonal to the arrangement direction of the transparent electrodes 4a and is connected to all the transparent electrodes 4a. It is provided as follows. Thereby, all the transparent electrodes 4a
Are set to have the same potential via the dummy electrode 13. The dummy electrode 13 is formed so as to cover a tip portion of the protrusion 9 of the metal thin film 7. A connection hole 15 is formed at a position of the dummy electrode 13 corresponding to the projecting portion 9, as a conductive means for connecting the dummy electrode 13 and the metal thin film 7.

The inner surface of the connection hole 15 is
The transparent conductive film that covers the inner surface is connected to the metal thin film 7 that forms the bottom of the connection hole 15. As a result, the protrusion 9 and the metal thin film 7 connected to the protrusion 9 are electrically connected to the dummy electrode 13 and the transparent electrode 4a connected to the dummy electrode 13.

Further, an alignment film (not shown) is formed on the surface of these transparent electrodes 4a.

On the other hand, the mother board 1b on the front side has a transparent substrate 2b, and has the same structure as the mother board 1a on the back side.
Twelve (column) × 4 (row) panel forming regions 6 are provided. A transparent electrode 4b and an alignment film (not shown) are laminated on each panel forming region 6 of the transparent substrate 2b on the front side.

The periphery of each panel forming area 6 formed on the pair of mother substrates 1 is surrounded by a sealing material 5, whereby the pair of mother substrates 1
It is formed integrally. Spacers 1 for adjusting the gap between the transparent substrates 2 are provided in a plane surrounded by the sealing material 5.
7 are uniformly dispersed, and a liquid crystal 18 is sealed. The pair of mother substrates 1 are divided for each panel forming area 6 to constitute a reflective liquid crystal display panel 10.

Next, a method of manufacturing the reflection type liquid crystal display panel 10 according to this embodiment will be described.

The mother substrate 1b on the front side is formed by patterning a transparent electrode 4b made of a transparent conductive film at a position corresponding to the panel forming region 6 of the reflection type liquid crystal display panel 10 so as to cover the transparent electrode 4b. It is formed by applying an alignment film material such as polyimide and rubbing it to form an alignment film.

The mother substrate 1a on the back side has a metal thin film 7 serving as a reflection layer at a position corresponding to the panel formation region 6.
To form At this time, a protruding portion 9 extending from one corner of the metal thin film 7 to a position reaching the non-panel forming region 8 is formed. Next, an insulating film 11 made of a positive photosensitive resin is formed on the surfaces of the metal thin film 7 and the protrusion 9. Then, by exposing and developing a portion of the non-panel forming region 8 located at the protruding portion 9, a hole penetrating in the thickness direction of the insulating film 11 is formed. Next, a transparent conductive film is formed on the surface of the insulating film 11. By doing so, the inner surface of the hole is covered with the transparent conductive film and connected to the metal thin film 7 constituting the bottom of the hole. Therefore, the connection hole 15 for connecting the transparent conductive film formed on the insulating film 1 and the metal thin film 7 can be formed very easily. Next, the transparent conductive film is patterned to form a transparent electrode 4a in the panel forming region 6 and a dummy electrode 13 in a portion of the non-panel forming region 8 where the connection hole 15 is formed. Then, an alignment film material such as polyimide is applied so as to cover the surface of the transparent electrode 4a, and is rubbed to form an alignment film.

Then, a sealing material 5 is applied to the periphery of the panel forming area 6 of the mother board 1b on the front side, and the spacers 17 are uniformly dispersed on the surface of the mother board 1a on the back side.
The mother substrate 1a is arranged such that the transparent electrodes 4a and 4b face each other.
Paste 1b. Thereafter, in order to expose the injection port provided in advance by the sealing material 5, the bonded mother substrate 1 is cut, and after the liquid crystal 18 is injected from the injection port, the injection port is sealed. Then, a portion of each reflective liquid crystal display panel 10 located in the panel formation region 6 is divided to form individual reflective liquid crystal display panels 10. At this time,
The portion where the dummy electrode 13 is formed is also removed.

Next, the operation of the present embodiment will be described.

In the present embodiment, the metal thin film 7 formed on the mother substrate 1a on the back side, the dummy electrode 13, and the transparent electrode 4a continuous with the dummy electrode 13 are electrically connected to each other. Therefore, the potentials of the metal thin film 7, the dummy electrode 13, and all the transparent electrodes 4a continuous with the dummy electrode 13 can be made equal.

Therefore, the charge amount of the mother substrate 1a on the back side can be suppressed, and the spacer 1
By preventing aggregation of the spacers 17 when spraying 7, the uniformity of the gap can be maintained. Further, even after the liquid crystal 18 is sealed between the pair of mother substrates 1, it is possible to prevent the liquid crystal from being turned on by the charging of the transparent substrate 2. This allows
Accurate measurement of the gap value can be performed, and the outflow of defective panels can be prevented.

The dummy electrode 13 in which the connection hole 15 is formed is connected to the liquid crystal 1 between the pair of mother substrates 1.
8 is removed after sealing, so that the connection hole 15 does not hinder the display of the reflective liquid crystal display panel 10.

In this embodiment, the spacer 1
The method of spraying 7 is a dry spraying method, but is not limited thereto, and a wet spraying method may be used. In the present embodiment, the transparent electrode 4
The connection hole 15 is formed in the dummy electrode 13 as a means for conducting the connection between the transparent electrode 4a and the metal thin film 7 at one end of the transparent electrode 4a. May be provided with a means for conducting electric current. Further, in the present embodiment, as a method of forming the connection hole 15, the insulating film 11 is exposed and developed and patterned, but is not limited thereto. For example, the insulating film 11 may be formed by: It may be removed by laser irradiation or the like.

The present invention is not limited to the above-described embodiment, but can be variously modified as needed.

[0034]

Next, an embodiment according to the present invention will be described.

First, a transparent electrode and an alignment film were laminated on the back surface of the glass substrate on the front side of the pair of glass substrates to form a mother board on the front side.

Next, an aluminum film serving as a reflective layer in a panel forming region and an aluminum film serving as a projecting portion in a non-panel forming region are formed on the front surface of the glass substrate on the back side of the pair of glass substrates by mask sputtering. 100n film
The film was formed to have a thickness of about m. On the surface of the aluminum film, a positive acrylic photosensitive resin was applied as an insulating film using a spinner so as to have a thickness of 3 μm, and then prebaked.

Next, holes were formed in the insulating film formed on the protruding portions of the aluminum film by performing exposure and development. Next, the glass substrate was heated to 220 ° C. and baked for one hour, and then a transparent conductive film was formed on the surface of the insulating film by sputtering so as to have a thickness of about 100 nm. Next, a transparent electrode was patterned and formed at a position corresponding to the panel formation region, and a dummy electrode connected to the transparent electrode was formed also at the non-panel formation region. Thus, the dummy electrode covered the inner peripheral surface of the connection hole and was connected to the aluminum film, and the transparent conductive film was connected to the aluminum film via the dummy electrode. Then, an alignment film was laminated on the surface of the transparent electrode to form a mother substrate on the back surface side.

A sealing material was applied to the periphery of each liquid crystal display panel forming area formed on the mother substrate on the front side. On the other hand, spacers were sprayed on the mother substrate on the back side by a dry spraying method. Then, after bonding the respective mother substrates, the mother material was cut by the sealing material so as to expose the injection port provided in advance. Then, the liquid crystal was injected from each of the exposed injection ports, and the injection port was sealed to seal the liquid crystal between the pair of mother substrates.
Then, by separating the pair of mother substrates for each liquid crystal display panel forming region and removing the non-display portion,
The reflection type liquid crystal display panel was prepared.

Thus, the amount of charge of the mother substrate on the back side when the spacers are sprayed by the dry spraying method is suppressed to 100 V or less in the present embodiment, compared with about 1 kV in the related art. Was completed. For this reason, conventionally, the spacer was aggregated because the mother substrate was charged when the spacers were sprayed, but in the present embodiment, the aggregation of the spacers could be prevented. Also,
In the related art, since the mother substrate is still charged even after a pair of glass substrates are bonded, the liquid crystal injected between the mother substrates may be turned on, but in the present embodiment, the liquid crystal is Since it did not come on, the gap value could be accurately measured.

[0040]

As described above, according to the motherboard for a reflection type liquid crystal display panel according to the first aspect of the present invention,
By making the potential of the metal film and the potential of the transparent electrode the same, it is possible to prevent the motherboard on the back side from being charged. Can be prevented. Further, it is possible to prevent the liquid crystal from being turned on after bonding the mother substrate. As a result,
This has the effect that a reflective liquid crystal display panel capable of performing accurate gap value measurement can be produced.
Further, since the dummy electrode is removed after the liquid crystal is sealed between the pair of transparent substrates, the conducting means does not affect the display of the liquid crystal display element using the reflection type liquid crystal display panel, and provides an accurate display. There is an effect that a reflective liquid crystal display panel that can be performed can be manufactured.

Further, according to the mother substrate for a reflection type liquid crystal display panel according to the second aspect of the present invention, it is possible to prevent the mother substrate on the back side from being charged by the connection holes.
By preventing the aggregation of the spacers at the time of dispersing the spacers, it is possible to prevent the gap from becoming uneven.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an embodiment of a reflective liquid crystal display panel using a mother substrate for a reflective liquid crystal display panel according to the present invention.

FIG. 2 is a plan view showing one liquid crystal display panel formation region formed on a mother substrate for a reflection type liquid crystal display panel according to the present invention.

FIG. 3 is a conceptual diagram of a vertical partial cross section showing a conventional reflective liquid crystal display panel.

FIG. 4 is a plan view of a mother substrate for a reflective liquid crystal display panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mother substrate 2 Transparent substrate 4 Transparent electrode 5 Sealing material 6 Panel formation area 7 Metal thin film 8 Non-panel formation area 9 Projection 10 Reflective liquid crystal display panel 11 Insulating film 13 Dummy electrode 15 Connection hole

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H089 NA09 NA11 PA03 QA10 QA14 TA02 2H092 GA32 GA39 HA04 HA06 HA28 KB24 MA05 NA12 PA03 5C094 AA03 AA43 AA46 AA48 AA55 BA43 CA19 DA12 DA13 DB10 EA01 EA05 EA06 EB04 EB04 EC03 FA GB10

Claims (2)

[Claims] 1. A reflection-type liquid crystal display panel mother substrate in which a metal film, an insulating film, and a transparent electrode are sequentially laminated at a position corresponding to a panel formation region of a liquid crystal display panel. At a corresponding position, a dummy electrode connected to the transparent electrode and a protruding portion extending from the metal film are provided, and these dummy electrodes and the protruding portion are electrically connected to each other via a conductive unit. A mother substrate for a reflective liquid crystal display panel, comprising: 2. The method according to claim 1, wherein the conduction means comprises a connection hole penetrating the insulating film in a thickness direction, and an inner surface of the connection hole is covered with a transparent conductive film forming the transparent electrode. 2. The mother substrate for a reflective liquid crystal display panel according to 1.