JP2003255855A - Display device and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which improves display distortion resulting from a depression operation of an inputting part and a decrease in the display performance of the display device due to touch panel mounting and is made thin and light. <P>SOLUTION: In this liquid crystal display device 1 provided with a liquid crystal panel 2 with liquid crystal 32 sandwiched between a first substrate 24a and a second substrate 24b opposite to each other, and the touch panel 4 for detecting position coordinates with an input made by depressing a substrate surface, a rear side substrate 8b of the touch panel 4 is layered on the first substrate 24a side of the liquid crystal panel 2 directly or through a polarizing plate 6a, the first and second substrates 24a and 24b are made of a glass substrate, and a thin area at ≥0.05 and ≤0.25 mm in thickness is formed on at least a portion of the second substrate 24b. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a touch panel as an input means and a manufacturing method thereof,
In particular, the present invention relates to a display device which is improved in display distortion due to a pressing operation of an input section and deterioration of display performance of a display device due to mounting of a touch panel, and which is thin and lightweight, and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, with the spread of small information electronic devices such as personal digital assistants (PDAs) and palmtop computers, it is possible to perform an input operation by superposing an input section on a liquid crystal display device. Liquid crystal display devices have been widely used. As this input-operable liquid crystal display device, conventionally, as shown in FIG. 9, a liquid crystal panel 92 having a structure in which a first glass substrate 92a and a second glass substrate 92b are bonded together by a sealing material 93 has a thickness of 0. A structure in which a front side substrate 94a made of a plastic film having a thickness of about 1 to 0.2 mm and a rear side substrate 94b made of a glass substrate or a plastic substrate having a thickness of about 0.4 mm to 1.1 mm are attached by a sealing material 99. A transparent touch panel (input unit) 94 having
It is known that the adhesive is fixed by the adhesive means 104. Transparent electrodes are formed on the inner surfaces of the front substrate 94a and the rear substrate 94b, respectively. A gap 105 of about 0.3 mm to 1 mm is provided between the touch panel 94 and the liquid crystal panel 92.

In this liquid crystal display device, an image formed by the liquid crystal panel 92 is visible through a transparent touch panel 94. Then, by pressing the outer surface of the touch panel 94, that is, the outer surface of the front-side substrate 94a with an input device or the like, position information of the pressed portion is input.

[0004]

However, in the above-mentioned conventional liquid crystal display device capable of input operation, if the rear substrate 94b of the touch panel 94 is made of a hard material such as a thick glass substrate, the touch panel 94 becomes thick. In addition, the weight of the display device becomes heavy, which makes it difficult to reduce the thickness and weight of the display device. In addition, the touch panel 9
If the gap 105 is provided between the liquid crystal panel 4 and the liquid crystal panel 92, it becomes difficult to reduce the thickness of the device. The liquid crystal display device having such a problem hinders downsizing and weight saving of a portable electronic device when the device is configured. In addition, the touch panel 94 and the liquid crystal panel 92
If there is a gap 105 between and, the display appears to be deep due to parallax, and the operability when pressing with the input device is poor.

A touch panel 94 and a liquid crystal panel 92 are also provided.
If there is a gap 105 between the liquid crystal panel 92 and the liquid crystal panel 92 is a reflective type, an air layer interface (air interface between the rear substrate 94b and the air layer or the first glass substrate 92a) is formed. And the interface with the air layer), unnecessary reflection occurs,
The image quality deteriorates. Although there are various problems due to the gap 105 between the touch panel 94 and the liquid crystal panel 92, conversely, when the touch panel 94 is directly attached to the liquid crystal panel 92, the touch panel 94 is attached to the tip of the input device. Touch panel 9 when pressing the surface of
4 locally deforms, and this deformation also causes the first glass substrate 92a of the liquid crystal panel 92 provided below the touch panel 94 to slightly bend. Since the substrate spacing (so-called cell gap) of the liquid crystal panel 92 is at most about 3 to 10 μm, the first glass substrate 92a is used.
Even if the bending is slight, the bending locally changes the cell gap of the liquid crystal panel 92 at a large ratio, so that the display is distorted and the visibility is deteriorated.

Such a problem can be solved by using a flexible substrate made of a plastic film substrate as the lower substrate of the liquid crystal panel 92 (the substrate on the side opposite to the touch panel). It has low heat resistance, and sufficient film characteristics cannot be obtained due to insufficient heating of the substrate when forming a transparent electrode or the like on the substrate. Further, the display performance of the liquid crystal panel itself is insufficient because the usable members for the alignment film and the like are limited.

The present invention has been made in view of the above circumstances, and in a display device equipped with an input means such as a touch panel, the display distortion of the display device due to the pressing operation of the input portion and the display performance of the display device equipped with the touch panel. It is an object of the present invention to provide a display device which is reduced in thickness and reduced in thickness, and which is reduced in thickness.

[0008]

In order to achieve the above object, the display device of the present invention comprises a display means in which an electro-optic material is sandwiched between a first substrate and a second substrate facing each other.
A display device comprising at least one substrate, and an input unit for detecting a position coordinate by an input by pressing the substrate surface, wherein the display unit is provided on the first substrate side, The substrate of the input unit is laminated directly or via an optical substrate, the first substrate and the second substrate are glass substrates, and the second substrate has a thin region formed in at least a part thereof. And The thickness of the thin region of the second substrate is preferably 0.05 mm or more and 0.25 mm or less.

In the display device of the present invention, since the substrate of the input section is laminated on the first substrate side of the display means directly or via the optical substrate, there is a gap between the input section and the display means. It is possible to make the display device thinner and lighter than the device provided with. Further, parallax due to the gap between the input unit and the display means is improved, the display is easier to see,
The operability when pressing the input unit is improved. Further, since it is possible to prevent the formation of an air layer in the gap between the input section and the display means, it is possible to prevent unnecessary reflection due to the air layer,
The image quality can be improved.

In this way, when the substrate of the input section is laminated directly or through the optical substrate on the first substrate side of the display means, the input device (pen-shaped or stick having a pointed tip).
When the surface of the input unit is pressed by the tip of a finger or a finger, the substrate of the input unit is locally deformed, and this deformation also locally bends the first substrate of the display unit provided below the input unit. In the present invention, since the first substrate and the second substrate are made of glass substrates and a thin region is formed on at least a part of the second substrate, flexibility is imparted to the second substrate. Therefore, even if the first substrate is bent by the pressing operation of the input unit, the second substrate can be bent in accordance with the bending of the first substrate. First, while suppressing local changes in distance
Since it is possible to prevent the electro-optic material between the second substrate and the second substrate from being adversely affected, it is possible to improve the display distortion due to the local change in the distance between the first and second substrates and improve the visibility.

Here, the second substrate having flexibility is
It has a structural property that relatively large bending occurs when a pressing force (for example, a force of about 0.1 to 5 N) that is applied when the user makes contact with the tip of an input device or a finger. Say that. In this case, the relatively large deflection is
A bending amount equal to or greater than the distance between the first and second substrates (for example, 5 to 5 when the display means is a liquid crystal display element).
10 μm). By forming the thin region on the second substrate, the second substrate provided with flexibility is effective for suppressing the display distortion of the display unit due to the pressing operation on the input unit.

On the other hand, it is usually preferable that the first substrate is hard or has low flexibility. Here, a hard material or a material having low flexibility means a pressing force (for example, a pressure applied when the user touches the input device).
When a force of about 0.1 to 5 N) is applied, there is a bending amount corresponding to a change in the inter-substrate distance that may cause a change in the display mode of the display means, but it is equal to or greater than the inter-substrate distance. No bending occurs (for example, when the display means is a liquid crystal display element, the amount of bending is 0.1 to 3 μm or less).

Further, since the glass substrate is superior in heat resistance to the plastic film substrate, it is the first of the display means.
By configuring the substrate and the second substrate from glass substrates,
The transparent electrode film or the like formed on the substrate can have sufficient characteristics, and the optimum orienting material can be adopted, so that sufficient display performance can be secured and the heat resistance of the display means can be improved. Further, in the display device of the present invention, since the thin region is formed on at least a part of the second substrate of the display means as described above, the display means also becomes thin and light, and as a result, the display is reduced. The device can be made thinner and lighter. Therefore, according to the display device of the present invention, it is possible to improve the display distortion caused by the pressing operation of the input unit, and to provide a thin and lightweight display device, which has such advantages. When the display device of the present invention is used in a portable electronic device, the device can be made compact and lightweight. If the thickness of the thin region is less than 0.05 mm, mechanical strength is insufficient and cracks or cracks are likely to occur, which is not practical in terms of manufacturing and is 0.25 mm.
If it exceeds, the flexibility is insufficient and the bending of the first substrate cannot be followed at the time of pressing input, and the display is distorted. Therefore, the thickness of the thin region is preferably 0.05 mm or more and 0.25 mm or less.

In the display device of the present invention, a thin region may be formed over substantially the entire one surface of the second substrate of the display means. In the display device of the present invention,
The thin region of the second substrate may be formed in a portion corresponding to the pressed region of the substrate surface of the input unit. In addition, the thin region of the second substrate may be formed to a portion slightly wider than a portion corresponding to the pressed region of the substrate surface of the input unit. In the display device of the present invention, a mounting terminal forming region for electrically connecting the display means and the electronic component may be formed on the first substrate. In the display device of the present invention, a mounting terminal forming region for electrically connecting the display means and the electronic component is formed on the second substrate, and the mounting terminal forming region is formed thicker than the thin region. May be. In the display device of the present invention, an electronic component may be mounted in the mounting terminal formation region formed on the first substrate and / or the second substrate.

When the second substrate of the display means provided in the display device of the present invention has the thin region formed over substantially the entire one surface, the second substrate has a small mechanical strength. On the second substrate, an I for driving the display means is provided.
COF (Chip On Fil)
Since it is difficult to mount by m) mounting or COG (Chip On Glass) mounting, etc., a mounting terminal for electrically connecting the display means and the electronic component is formed on the first substrate having sufficient mechanical strength. It is possible to electrically connect the display unit and the electronic component by forming a region and mounting the electronic component on the lead wiring formed in the mounting terminal formation region by COG mounting or the like.

Further, when it is necessary to mount an electronic component on the second substrate of the display means, the thin region is pressed not on the entire one surface of the second substrate but on the substrate surface of the input section. A mounting terminal forming region for electrically connecting the display means and the electronic component is formed on the second substrate, and the thickness of the mounting terminal forming region is set to the thin thickness. By making the mounting terminal thicker than the area, the mounting terminal forming area has a mechanical strength that can withstand mounting, and the electronic component is mounted by COG mounting or the like on the lead wiring formed in the mounting terminal forming area. It is possible to electrically connect the display means and the electronic component. In the display device in which the electronic component is mounted in the mounting terminal forming region formed on the second substrate as described above,
If necessary, a mounting terminal forming region is formed on the first substrate,
You may make it mount an electronic component in this mounting terminal formation area.

The second substrate of the display means provided in the display device of the present invention has the thin region as described above, particularly the thin region having a thickness of 0.05 mm or more and 0.25 mm or less, formed on at least a part thereof. However, if the second substrate has the above-mentioned thin region formed from the beginning, the mechanical strength will decrease, so that the first substrate may be formed during the process of manufacturing the display device.
When an external force such as a pressure is applied when the substrate and the second substrate are bonded to each other, a defect such as a crack or a crack is likely to occur in the second substrate, which may reduce the yield, but the display device of the present invention described later. By adopting the manufacturing method described above, the display device of the present invention having the above-described structure can be manufactured with a high yield without causing defects such as cracks and cracks in the second substrate.

In the display device of the present invention, the display means may be a liquid crystal display element in which a liquid crystal layer is sandwiched between a first substrate and a second substrate facing each other. In this case, liquid crystal is used as the electro-optical material. Also,
The liquid crystal display device may be of a reflective type, a transmissive type or a semi-transmissive reflective type provided with an illuminating means on the lower side of the second substrate, and the display system may be a monochrome display system or a color display system. The display system may be any one, and the drive system may be either a passive matrix system or an active matrix system. Further, in the display device of the present invention, the display means may be an organic EL element in which a light emitting layer containing an organic EL material is sandwiched between a first substrate and a second substrate facing each other. In this case, an organic EL material is used as the electro-optical material. In the display device of the present invention, the input unit may be a resistive film type touch panel.

Further, in the display device of the present invention, the optical substrate interposed between the first substrate of the display means and the substrate of the input section may be, for example, a phase difference when the display means is a liquid crystal display device. Examples thereof include an optical compensation plate such as a plate and / or a polarizing plate, and when the display means is an organic EL element, examples thereof include a circular polarizing plate and an optical film such as a condensing film using a hologram technique. .

A method of manufacturing a display device according to the present invention comprises display means having an electro-optical material sandwiched between a first substrate and a second substrate facing each other, and at least one substrate. A method of manufacturing a display device, comprising: an input unit that detects a position coordinate by an input by pressing a substrate surface; and an electro-optical device between a first substrate and a second substrate, which are glass substrates facing each other. Before the step of adhering the input section directly or through the optical substrate on the first substrate of the display means in which the material is sandwiched, a plurality of or a plurality of first substrate base materials having a first substrate region and a plurality of or A step of adhering a second substrate base material having a single second substrate area so that the corresponding substrate areas face each other; and a second substrate on the lower surface of the second substrate base material attached to the first substrate base material At least part of the area Characterized in that it comprises a step of forming a thin region. In the step of forming the thin region, the thickness of the thin region is 0.05 mm or more and 0.25 m.
It is preferably m or less.

In the present invention, the first substrate base material is a material for obtaining the first substrate of the display means by cutting along the peripheral edge of the first substrate region. When the first substrate base material has a plurality of first substrate regions, the first substrate
A plurality of first substrates can be taken from the substrate base material, and if the first substrate base material has a single first substrate region, one first substrate can be taken from the first substrate base material. Is. Further, the second substrate base material is a material in which the second substrate of the display means is obtained by cutting along the peripheral edge of the second substrate region. When the second substrate base material has a plurality of second substrate regions, a large number of second substrates can be obtained from the second substrate base material, and the second substrate base material has a single second substrate region. If it has one, one second substrate can be taken from this second substrate base material. Further, in the present invention, both the first substrate base material and the second substrate base material may be capable of forming a large number of first or second substrates,
One substrate base material may be capable of taking a large number of second substrates (or first substrates), and the other substrate base material may be capable of taking a single first substrate (or second substrates). Both the first substrate base material and the second substrate base material may be capable of taking a single substrate of the display means.

In the method of manufacturing a display device according to the present invention, after the step of attaching the first substrate base material and the second substrate base material so that the corresponding substrate regions face each other, the display substrate is attached to the first substrate base material. Since the step of forming the thin region is formed on at least a part of the second substrate region on the lower surface of the combined second substrate mother material, the second used in the bonding process of the first and second substrate mother materials Since the substrate base material has no thin region formed, it has a mechanical strength capable of withstanding the pressure applied in this bonding step. Therefore, in the above bonding step, the second substrate base material is free from cracks and cracks. It is possible to prevent the occurrence of defects. Further, for example, an electrode is provided on the second substrate region of the second substrate base material before being bonded to the first substrate base material.
In order to form wirings, elements, etc., processing is performed in one sheet, but since a thin region is not formed in this second substrate base material, cracks and cracks are not generated during the above processing. It can be prevented. Therefore, according to the method of manufacturing a display device of the present invention, the display device of the present invention can be manufactured with high yield. Such an effect can be similarly obtained even when the thickness of the thin region formed in the step of forming the thin region is 0.05 mm or more and 0.25 mm or less.

In the method of manufacturing the display device of the present invention,
In the step of forming the thin region, the thin region may be formed over substantially the entire second substrate region on the lower surface of the second substrate base material. In the method for manufacturing a display device of the present invention, in the step of forming the thin region, in the second substrate region on the lower surface of the second substrate base material,
It is preferable that the thin region is formed in a portion of the input portion corresponding to the pressed region of the substrate surface. In the method for manufacturing a display device of the present invention, between the step of forming the thin region and the step of attaching the input unit directly or via an optical substrate on the first substrate of the display means, A step of mounting an electronic component in the mounting terminal formation region formed on the first substrate and electrically connecting the display means and the electronic component may be provided.

In the step of forming the thin region, when the thin region is formed over substantially the entire lower surface of the second substrate base material of the second substrate base material, a second substrate obtained from the second substrate base material is formed. Since the substrate has a low mechanical strength, it is difficult to mount electronic components such as a chip component such as an IC for driving the display means on the second substrate by COF mounting or COG mounting, but the mechanical strength is sufficient. First of the first substrate base materials
A mounting terminal formation region for electrically connecting the display means and the electronic component is formed toward the substrate region, and a lead wiring formed in the mounting terminal formation region of the first substrate obtained from the first substrate base material. It is possible to electrically connect the display means and the electronic component without causing defects such as cracks and cracks on the substrate during mounting by mounting the electronic component by COG mounting or the like. The display device can be manufactured with high yield.

Further, in the method for manufacturing a display device of the present invention, the step of forming the thin region and the step of adhering the input section on the first substrate of the display means directly or via an optical substrate are included. In between, a step of mounting an electronic component on a mounting terminal formation region formed on the second substrate and having a thickness larger than the thickness of the thin region and electrically connecting the display means and the electronic component may be provided. In the case of manufacturing a display device having a display means in which electronic components are mounted on the second substrate, it is preferable that the thin region is formed over substantially the entire second substrate region of the second substrate base material. Since the second substrate obtained from the substrate base material has low mechanical strength, it is difficult to mount electronic components such as chip components such as display means driving ICs on the second substrate by COF mounting or COG mounting. Therefore, a mounting terminal forming region having a thickness larger than the thickness of the thin region is formed in the second substrate region of the second substrate base material.
By mounting the above-mentioned electronic component by COG mounting or the like on the lead wiring formed in the mounting terminal formation region of the second substrate obtained from the substrate base material, defects such as cracks and cracks do not occur in the substrate during mounting. Since the display means and the electronic component can be electrically connected, the display device of the present invention can be manufactured with high yield.

Further, in the method for manufacturing a display device of the present invention, in the step of forming the thin region, the remaining portion of the lower surface of the second substrate base material is exposed while the remaining portion is masked. It may be covered with a material and the exposed portion may be etched to form the thin region. The etching solution used here is a hydrofluoric acid-based etching solution. Further, in the step of forming the thin region, the means for forming the thin region in the second substrate region of the second substrate base material is not limited to the above etching, but may be mechanical processing such as bite grinding. .

In the method of manufacturing a display device of the present invention, the step of cutting out the first substrate and the second substrate from the bonded first substrate base material and second substrate base material includes the step of cutting the first substrate base material and the second substrate base material. It may be provided between the step of bonding the two substrate base materials and the step of forming the thin region, or the step of forming the thin region and the input unit on the first substrate of the display means. It may be provided directly or between the step of attaching via an optical substrate. In the display device manufacturing method of the present invention, the step of forming the electro-optic material is provided between the step of bonding the first substrate base material and the second substrate base material and the step of forming the thin region. Alternatively, it may be provided between the step of forming the thin region and the step of attaching the input unit directly or via the optical substrate on the first substrate of the display means, or by attaching them together. The first substrate base material and the second substrate base material may be provided in the middle of the process of cutting the first substrate and the second substrate, or the first substrate base material and the second substrate base material may be opposed to each other. It may be provided after cutting a pair of the first substrate and the second substrate.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described in detail. [First Embodiment] A liquid crystal display device provided with a touch panel (input unit) of a resistive contact type will be described as an example of the display device of the present invention with reference to FIGS. 1 to 3. Figure 1
2 is a schematic cross-sectional view showing the overall structure of the liquid crystal display device of the present embodiment, FIG. 2 is an exploded perspective view showing the structure of the touch panel provided in the liquid crystal display device of the present embodiment, and FIG. FIG. 3 is a plan view of a liquid crystal panel (display means) included in the liquid crystal display device of the present embodiment when viewed from the touch panel side. In addition, in each drawing, in order to make each layer and each member a size that can be recognized in the drawing, the scale is different for each layer and each member.

The liquid crystal display device 1 of this embodiment is a liquid crystal panel (display means) for displaying a visible image such as characters and numbers.
2 and a touch panel (input unit) 4 for inputting data by bringing the input device 3 into contact with each other. The touch panel 4 is arranged on the side of observing the image of the liquid crystal panel 2 with respect to the liquid crystal panel 2 and also on the side of performing an input operation on the touch panel 4 (upper side in the drawing, in other words, front side).

A polarizing plate 6a is arranged between the liquid crystal panel 2 and the touch panel 4, and is on the opposite side of the liquid crystal panel 2 from the side where the image of the liquid crystal panel 2 is observed, that is, the lower side in the drawing, in other words, the rear side. A polarizing plate 6b is arranged in the. The polarization axis of the polarization plate 6a and the polarization axis of the polarization plate 6b are oriented in a direction having a predetermined angle difference from each other in order to obtain the polarization transparency required for displaying a visible image. On the lower side (back side) of the polarizing plate 6b, a backlight (illumination means) 3 is provided.
7 are arranged. Elements of the touch panel 4, the polarizing plate 6a, the liquid crystal panel 2, the polarizing plate 6b, and the backlight 37 that are overlapped with each other are adhered by an adhesive or adhesive such as epoxy or acrylic.

The front side substrate 8a of the touch panel 4 is provided on the inner surface of the front side substrate material 11a made of a plate-shaped transparent resin material or the like, that is, on the surface facing the back side substrate 8b,
Display area of liquid crystal panel 2 (area that actually contributes to display)
It is produced by forming a flat plate-shaped surface electrode 12a so as to cover the area corresponding to the above, and further forming a pair of low resistance electrodes 13 at both ends in the Y direction of this surface electrode 12a. On the other hand, the back side substrate 8b is formed by placing the liquid crystal panel 2 on the inner surface of the back side substrate material 11b made of a plate-shaped transparent resin material or the like.
It is manufactured by forming a flat plate-shaped surface electrode 12b so as to cover a range corresponding to the display area of, and further forming a pair of low resistance electrodes 14 at both ends in the X direction of the surface electrode 12b. Surface electrode 12 of front side substrate 8a of touch panel 4
The area where a is formed is the area pressed by the input device 3. The area of the rear substrate 8b of the touch panel 4 where the surface electrode 12b is formed is the area pressed by the input device 3.

The touch panel 4 is formed by bonding the front side substrate 8a and the back side substrate 8b with the sealing material 9 arranged on the peripheral portion of the back side substrate 8b. At this time, the low resistance electrode 13 formed on the front side substrate 8 a is conductively connected to the auxiliary electrode 18 formed on the rear side substrate 8 b via the conductive material 17, and further the terminal is formed via the auxiliary electrode 18. Conductive connection is made to the portion 16. As shown in FIG. 1, the distance between the front-side substrate 8a and the rear-side substrate 8b bonded by the sealing material 9 is kept constant by a spherical spacer 19, for example.

The front-side substrate material 11a and the back-side substrate material 11b are both formed of a flexible material, for example, a plastic film made of polycarbonate (PC), polyacrylate (PAr), polyether sulfone (PES), or the like. To be done. Also, the surface electrodes 12a and 12b
Is formed of, for example, a transparent electrode material such as indium tin oxide (ITO), and has a substantially uniform surface resistance over the entire surface thereof. Furthermore, the low resistance electrodes 13 and 14, the auxiliary electrode 18, and the terminal portion 16 are formed of, for example, silver paste.

As shown in FIG. 1, the liquid crystal panel 2 includes a first substrate unit 22a and a second substrate unit 2 which face each other.
2b and. The liquid crystal panel 2 includes the first substrate unit 2
2a and the second substrate unit 22b are bonded together at the peripheral portion of the substrate by a sealing material 23 formed in a frame shape on the surface of one of these substrate units.

The first board unit 22a includes a first board 24.
A light-transmissive first electrode 26a is formed on the liquid crystal layer side surface (lower surface) of a, that is, the surface facing the second substrate unit 22b, and an overcoat layer (not shown) made of silicon oxide or the like is formed on the lower surface. And an alignment film (not shown) made of a polyimide resin that has been subjected to a rubbing treatment for imparting liquid crystal alignment to the lower surface thereof. The second substrate unit 22b has a liquid crystal layer side surface (upper surface) of the second substrate 24b, that is, the second substrate unit 22b.
The second electrode (semi-transmissive reflective electrode) 26b is formed on the surface facing to, and an overcoat layer (not shown) made of silicon oxide or the like is formed thereon (upper surface) and further thereon
An alignment film (not shown) made of a polyimide resin that has been subjected to a rubbing treatment for imparting a liquid crystal alignment property is formed.

The first electrode 26a is formed of a light-transmissive conductive material such as ITO. The second electrode 26b has a slit (opening) formed in a metal film such as aluminum. The first electrode 26a is formed in a stripe shape. On the other hand, the second electrode 26b is arranged in a stripe shape by being arranged so as to intersect the first electrode 26b. A plurality of regions where these electrodes 26a and 26b intersect in a dot matrix form pixels for displaying a visible image. An area defined by a group of the plurality of pixel areas serves as a display area for displaying a visible image such as a character. In the above embodiment, the passive type monochrome display transflective liquid crystal device has been described. However, for example, a color filter layer is formed between the first substrate 24a and the first electrode 26a. Alternatively, a color filter layer and a transparent electrode are sequentially formed on the second substrate 24b and the second electrode b, and an overcoat layer (not shown) made of silicon oxide or the like is sequentially formed thereon (upper surface), and then the second A semi-transmissive reflection type liquid crystal display of a passive color display is formed by forming an alignment film (not shown) made of a polyimide resin on the electrode b (upper surface) that has been subjected to a rubbing treatment for imparting liquid crystal alignment. Of course, it can be applied to the device. Similarly, a liquid crystal display device having a structure sandwiched between two substrate glasses, that is, a reflective type, a semi-transmissive reflective type, a transmissive type monochrome display and color display by a passive matrix drive (STN liquid crystal), and a TFT (Thin- Film
The present invention can be applied to all of reflective type, semi-transmissive reflective type, transmissive monochrome display and color display by active matrix driving (TN liquid crystal) using a Transistor) element or a TFD (Thin-Film Diode) element.

On the liquid crystal layer side surface of either one of the first substrate unit 22a and the second substrate unit 22b, a plurality of spacers (not shown) are arranged in a dispersed state. Sealing material 2 on the liquid crystal layer side surface
3 is provided in a frame shape. Inside the sealing material 23, as shown in FIG. 1, a conductive material 31 is mixed in a dispersed state. A liquid crystal inlet (not shown) is formed in a part of the sealing material 23. First board unit 22a
When the second substrate unit 22b and the second substrate unit 22b are bonded to each other via the sealing material 23, a gap having a uniform size, for example, about 5 μm, held by the spacer is provided between the first substrate 24a and the second substrate 24b. Since a so-called cell gap is formed, liquid crystal (electrical engineering material) 32 is injected into the cell gap through the liquid crystal injection port, and after the injection of the liquid crystal is completed, the liquid crystal injection port is sealed with resin or the like.

The first substrate 24a is formed of a hard material, specifically, a relatively thick glass substrate (for example, having a thickness of 0.4 mm or more). On the other hand, the second substrate 2
4b has a thickness of 0.05 mm or more and 0.25 mm over the entire lower surface (surface opposite to the liquid crystal layer side) of the glass substrate.
The following thin regions are formed, and therefore, the second substrate 24b is composed of thin regions having a thickness of 0.05 mm or more and 0.25 mm or less.

As shown in FIGS. 1 and 3, the first embodiment of the present invention is shown.
The board 24a is provided with a board projecting portion (mounting terminal forming area) 24c that projects to the outer peripheral side of the second board 24a. The first electrode 26a on the first substrate 24a extends toward the substrate overhanging portion 24c and constitutes a part of the terminal portion pattern 33. The substrate overhanging portion (mounting terminal formation region) 24 is provided on the first substrate 24a because the second substrate 24a has a thickness of 0.05 mm or more and 0.25 mm or less as described above, Due to its low strength, this second substrate 24
Liquid crystal driving IC (electronic parts) is mounted on a.
Since it is difficult to mount by mounting or the like, the mounting terminal forming region 24c is provided on the first substrate 24a having sufficient mechanical strength. In the present embodiment, the mounting terminal forming area 2
The liquid crystal driving IC is attached to the terminal pattern 33 formed on the 4c.
36 is COG mounted, and the liquid crystal panel 2 and the liquid crystal driving I
It is electrically connected to C36. In addition, the second substrate 2
The second electrode 26b on 4b is conductively connected to the terminal portion pattern 33 on the substrate overhanging portion 22c via the conductive material 31 dispersed in the sealant 23. Terminal pattern 3
Reference numeral 3 is a wiring pattern that enables an electrical connection with a liquid crystal driving IC (electronic component) 36 provided for electrically driving the liquid crystal panel 2.

The first substrate 24a of the liquid crystal panel 2 as described above.
The back side substrate 8b of the touch panel 4 is attached to the upper side of the above via a polarizing plate 6a. In the touch panel 4, an input control circuit (not shown) is connected to the terminal portion 16, and the input control circuit causes the low resistance electrodes 14 and 14 located at both ends in the X direction of the rear substrate 8b at a certain point in time. A predetermined voltage is applied between the front side substrate 8a
A voltage measuring means (voltage measuring circuit or voltage measuring element, not shown) in the input control circuit is conductively connected between the low resistance electrodes 13, 13 located at both ends in the Y direction. At this point, a uniform voltage drop occurs in which the voltage linearly changes along the X direction on the surface electrode 12b of the rear substrate 8b, and the portions having the same position coordinate axes in the X direction have substantially the same potential. Such a voltage distribution is formed. At this time, when a portion of the front substrate 8a is pressed by the tip of the input device 3 in the region corresponding to the display region of the liquid crystal panel 2 (the region where the substrate surface is pressed), the surface electrode 12a of the front substrate 8a is pressed. And the surface electrode 12b of the rear substrate 8b come into contact with each other, and therefore, through the surface electrode 12a on the front substrate 8a,
The voltage of the surface electrode 12b at the position corresponding to the above-mentioned region pressed by the input device 3 can be measured by the input control circuit. Since the value of the measured voltage correlates with the position coordinate of the pressed portion in the X direction,
The input control circuit can detect the position in the X direction of the portion pressed by the input device 3.

On the other hand, at some other time, a predetermined voltage is applied between the low resistance electrodes 13 and 13 located at both ends in the Y direction on the front side substrate 8a by the input control circuit, and the rear side The voltage measuring means is connected between the low resistance electrodes 14, 14 located at both ends of the substrate 8b in the Y direction.

At this time, a uniform voltage drop occurs in the surface electrode 12a of the front substrate 8a along the Y direction, and a voltage distribution in which the voltage changes linearly is formed. The input control circuit detects the voltage of the surface electrode 12a of the front side substrate 8a at the position corresponding to the portion pressed by the input device 3 through the surface electrode 12b of the rear side substrate 8b, and thus the above-mentioned X direction is related. Similar to the case of the position, the position of the pressed portion in the Y direction can be detected.

By repeating the switching of the above two connection states with respect to the input control circuit within a short time, the input control circuit causes the input control circuit to position coordinate values in the X direction and position coordinate axes in the Y direction of the portion pressed by the input device 3. Can be detected.

A backlight 37 is arranged below the second substrate 24b of the liquid crystal panel 2 with a polarizing plate 6b interposed therebetween. The backlight 37 includes a light guide plate 38 made of a transparent resin, which is arranged below the polarizing plate 6 b, and a light emitting diode (light source) 3 arranged on the side surface of the light guide plate 38.
9, the light guide plate 38 is provided with a light guide structure for deflecting the light emitted from the light emitting diode 39 and ensuring the in-plane uniformity of the illuminance with respect to the liquid crystal panel 2. As this light guide structure, for example,
On the back surface of the light guide plate 38, a light modulating means 38a such as a surface uneven portion having a light scattering or light reflecting function, a printing layer, a reflecting layer is provided, and the degree of the light modulating function by the light modulating means 38a becomes stronger as the distance from the light source increases. It is conceivable that it is configured to be. For example, as the distance from the light emitting diode 39 increases, the formation density of the light modulation means 38a is increased, or the modulation function of the light modulation means 38a is increased to make the planar distribution of the amount of light emitted from the upper surface of the light guide plate 38 uniform. can do.

Further, as shown in FIG. 1, the light guide plate 38 is integrally provided with a support portion 38b which is formed thickly in the peripheral portion thereof. The supporting portion 38b directly or indirectly supports the peripheral portion of the second substrate unit 22b of the liquid crystal panel 2. Therefore, a gap is provided between the liquid crystal panel 2 and the light guide plate 38 in a portion other than the supporting portion 38b. The backlight 37 is not limited to the above structure, and may have any other structure as long as it functions as a planar light source that can emit illumination light from the lower side of the liquid crystal panel 2. .

In the display device provided with such a backlight 37, the light emitted from the light guide plate 38 passes through the slits of the second electrode 26b through the polarizing plate 6b and the second substrate 24b, and is then emitted from the liquid crystal panel 2. The light enters the touch panel 4, passes through the touch panel 4, and is emitted to the front side. Therefore, by supplying power to the light emitting diode 39 and turning on the backlight, it is possible to visually recognize the display image even in a dark place. On the other hand, in a bright place, the ambient light is reflected by the second electrode 26b and the displayed image can be visually recognized without turning on the backlight 37.

In the liquid crystal display device 1 of this embodiment, since the back side substrate 8b of the touch panel 4 is attached to the first substrate 24a side of the liquid crystal panel 2 via the polarizing plate 6a, the touch panel 4 and the liquid crystal are Since there is no gap between the panel 2 and the liquid crystal panel, a liquid crystal display device can be thinner and lighter than a conventional liquid crystal display device in which a gap is provided between the touch panel and the liquid crystal panel. Also, parallax due to the gap between the touch panel 4 and the liquid crystal panel 2 is improved,
The display is easily visible, and the operability when pressing the touch panel 4 is improved. Further, since it is possible to prevent an air layer from being formed in the gap between the touch panel 4 and the liquid crystal panel 2, it is possible to prevent unnecessary reflection due to the air layer and improve the image quality. Further, in the present embodiment, the first substrate 24
Since the second substrate 24b facing a is made of a glass substrate having a thickness of 0.05 mm or more and 0.25 mm or less, flexibility is imparted to the second substrate 24b. Even if the first substrate 24a is bent, the second substrate 24b can be bent following the bending of the first substrate 24a, thereby suppressing a local change in the cell gap and filling the cell gap. Since it is possible to prevent the liquid crystal 32 that has been damaged from being adversely affected,
Display distortion due to local changes in the cell gap can be improved, and visibility can be improved.

Further, since the glass substrate is superior in heat resistance to the plastic film substrate, the first and second substrates constituting the liquid crystal panel 2 are composed of the glass substrates, and thus the transparent substrate formed on the substrates is formed. Sufficient characteristics can be obtained for the electrode films (first electrode and second electrode) and the like, and an optimal alignment material can be adopted, so that sufficient display characteristics can be secured and the heat resistance of the liquid crystal panel can be improved. Further, in the liquid crystal display device 1 of the present embodiment, as described above, the second substrate 24b of the liquid crystal panel 2 is composed of a glass substrate of 0.05 mm or more and 0.25 mm or less. Since it becomes thinner and lighter, it is possible to make the liquid crystal display device thinner and lighter. Therefore, according to the liquid crystal display device 1 of the present embodiment, the distortion of the display caused by the pressing operation of the touch panel 4 is improved, the display performance of the display device is reduced by mounting the touch panel 4, and the display device is made thinner and lighter. The liquid crystal display device can be provided, and when the liquid crystal display device 1 of the present embodiment having such advantages is used for a portable electronic device, the device can be downsized and the weight can be reduced.

The first method of manufacturing the liquid crystal display device 1 having the above structure will be described below with reference to FIGS. First, as shown in FIG. 4A, the first electrodes 26 are respectively formed on the sides of the plurality of first substrate regions 124d of the first substrate base material 124a for facing the liquid crystal layer for taking a large number of the first substrates 24a.
a and the terminal portion pattern 33 are formed, the first electrode 26a
An overcoat layer (not shown) made of silicon oxide or the like and an alignment film (not shown) made of a rubbing-treated polyimide resin are sequentially formed on the side facing the liquid crystal layer. Here, the terminal portion pattern 33 is a portion 2 that becomes the substrate overhanging portion 24c after the first substrate 24a is cut out from the first substrate base material 124a.
4d. The thickness of the first substrate base material 124a is 0.4 mm or more.

On the other hand, after forming the second electrodes 26b on the sides of the plurality of second substrate regions 24e of the second substrate base material 124b for taking a large number of the second substrates 24b facing the liquid crystal layer, the second electrodes 26b are formed. An overcoat layer (not shown) made of silicon oxide or the like and an alignment film (not shown) made of a rubbing-treated polyimide resin are sequentially formed on the side of 26b facing the liquid crystal layer. Here, the thickness of the second substrate base material 124b is 0.
It is 4 mm or more. Then, the first substrate base material 124
The annular sealing material 23 in which the conducting material 31 is dispersed is formed by a printing method or the like on the inner side of the peripheral edge of each substrate region of the a or the second substrate base material 124b. A liquid crystal inlet (not shown) is formed in a part of each sealing material 23 formed here. Next, spacers (not shown) are scattered on the inside of each sealing material 23 formed on one substrate base material. Then, these first
After arranging the substrate base material 124a and the second substrate base material 124b so that the corresponding substrate areas face each other, one substrate base material is pressed against the other substrate base material, and as shown in FIG. The substrate regions to be bonded are attached to each other via the sealing material 23.

Next, as shown in FIG. 4B, the entire lower surface of the second substrate base material 124b bonded to the first substrate base material 124a is etched to make the thickness of the second substrate base material 124b 0.05 mm or more. By making it 0.25 mm or less,
0.05 mm or more on the entire lower surface of the second substrate region 24e.
A thin area of 25 mm or less is formed. When the second substrate base material 124b is etched here, the second substrate base material 124b
The remaining portion (first substrate base material 1
The upper surface and the end surface of 24a, the sealing material 23, and the like) are covered with a mask material (not shown) made of a film, a resin, or the like, and the exposed portion is etched using a hydrofluoric acid-based etching solution.

After that, the bonded first and second substrate base materials 124a and 124b are cut along the peripheries of the individual substrate regions, and an empty panel (liquid crystal is injected as shown in FIG. 4C). A plurality of liquid crystal panels 2a before being obtained are obtained. 4 (a)-
Reference numeral 125 in (b) indicates the first and second substrate base materials 124.
It is a cutting line when cutting a and 124b.

Then, as shown in FIG. 4D, after the liquid crystal 32 is injected into the cell gap from the liquid crystal injection port of each empty panel 2a, the liquid crystal injection port is filled with a sealant such as a mold resin. By curing, the liquid crystal injection port is sealed to obtain the liquid crystal panel 2. Here, the injection pressure of the liquid crystal 32 is preferably a negative pressure. When the liquid crystal 32 is injected into the empty panel 2a composed of the first substrate 24a and the second substrate 24b in which the thin region is formed as described above at a positive pressure, the central portion of the panel may swell to cause cell gap unevenness.
The cell gap can be easily controlled by setting the injection pressure of the liquid crystal 23 to a negative pressure. After that, the liquid crystal driving I is formed on the terminal pattern 33 formed in the mounting terminal forming region 24c of the liquid crystal panel 2a.
COG mounting of C36, liquid crystal panel 2 and liquid crystal drive IC
36 is electrically connected.

Next, as shown in FIG. 5 (e), the polarizing plate 6a is attached to the upper surface of the first substrate 24a of the liquid crystal panel 2 with the above-mentioned adhesive or adhesive, and the polarizing plate 6b is attached to the lower surface of the second substrate 24b. Is adhered by the above-mentioned pressure-sensitive adhesive or adhesive. Then, the back side substrate 8b of the touch panel 4 is attached to the first substrate 24a of the liquid crystal panel 2 via the polarizing plate 6a with the above-mentioned adhesive or adhesive. Then, as shown in FIG. 5 (f), the supporting portion 38b of the backlight 37 is adhered below the second substrate 24b of the liquid crystal panel 2 via the polarizing plate 6b.
A liquid crystal display device 1 as shown in is obtained.

In the method of manufacturing the liquid crystal display device 1 of the present embodiment, after the step of bonding the first substrate base material 124a and the second substrate base material 124b so that the corresponding substrate regions face each other, the first substrate base material 124a A step of etching the entire lower surface of the second substrate base material 124b bonded to the material 124a to form a thin region having a thickness of 0.05 mm or more and 0.25 mm or less over the entire lower surface of each second substrate region. As a result, the first and second substrate base materials 124a, 1
Second substrate base material 124b used in the laminating step of 24b
Has a mechanical strength capable of withstanding the pressure applied in the bonding step because the thin area is not formed with the original thickness as it is, and thus the second substrate base material 124b is cracked in the bonding step. It is possible to prevent defects such as cracks and cracks from occurring. In order to form the second electrode 26b, the overcoat layer, the alignment film, the terminal portion pattern 33, etc. on the second substrate region 24e of the second substrate base material 124b before being bonded to the first substrate base material 124a. Although processing is performed in the state of one sheet, since a thin region is not formed in the second substrate base material 124a, it is possible to prevent cracks and cracks from occurring during the above processing. Therefore, according to the method of manufacturing the liquid crystal display device of the present embodiment, the liquid crystal display device 1 of the present embodiment having the above structure can be manufactured with a high yield.

In the method of manufacturing the liquid crystal display device according to the present embodiment, the entire lower surface of the second substrate base material 124b is etched to form the thin region on the entire lower surface of the second substrate region 24e. Since the second substrate 24b obtained from the second substrate base material 124b has a low mechanical strength, electronic components such as liquid crystal driving ICs are mounted on the second substrate 24b by COF mounting or COG mounting. Although difficult to do, the first substrate base material 1 having sufficient mechanical strength
The mounting terminal forming region 2 is formed on the first substrate region 24d of 24a.
The portion 24d to be 4c is formed, and the first substrate base material 124 is formed.
mounting terminal formation region 24 of the first substrate 24a obtained from FIG.
The liquid crystal driving IC 3 is formed on the terminal portion pattern 33 formed on c.
6 is mounted by COG mounting or the like, the liquid crystal panel 2 can be manufactured without causing defects such as cracks and cracks during mounting.
And the liquid crystal driving IC 36 can be electrically connected to each other, and the liquid crystal display device 1 of the present embodiment having the above structure can be manufactured with high yield.

In the method of manufacturing the liquid crystal display device according to the present embodiment, the first substrate base material 124a and the second substrate base material 124b which are bonded together are cut to form the empty panel 2a before the second substrate. Although the case where the base material 124b is etched to form the thin region has been described, the base material 124b may be manufactured by the second manufacturing method described below. First, FIG. 4 (a)
First substrate base material 12 bonded in the same manner as the step shown in FIG.
4a and the second substrate base material 124b are cut along a cutting line 125 to fabricate a plurality of empty panels 2b as shown in FIG. 6 (a).

Next, as shown in FIG. 6B, after the liquid crystal 32 is injected into the cell gap from the liquid crystal injection port of the empty panel 2b, this liquid crystal injection port is sealed in the same manner as the above method.
Then, as shown in FIG. 6C, the entire lower surface of the second substrate region 24e is etched to remove the second substrate region 2
The liquid crystal panel 2 is obtained by forming a thin region of 0.05 mm or more and 0.25 mm or less on the entire lower surface of 4e. And
The liquid crystal driving IC 36 is COG-mounted on the terminal pattern 33 formed in the mounting terminal formation region 24c of the liquid crystal panel 2a.

Then, the polarizing plate 6a is attached to the upper surface of the first substrate 24a of the liquid crystal panel 2 and the polarizing plate 6b is attached to the lower surface of the second substrate 24b in the same manner as in the step shown in FIG. 5 (e).
Then, the polarizing plate 6a is formed on the first substrate 24a of the liquid crystal panel 2.
The back side substrate 8b of the touch panel 4 is attached via.
Then, as shown in FIG. 5 (f), the supporting portion 38b of the backlight 37 is adhered below the second substrate 24b of the liquid crystal panel 2 through the polarizing plate 6b to obtain the liquid crystal display device 1 as shown in FIG. To be

The first substrate base material 12 bonded in this way
4a and the second substrate base material 124b are cut, the liquid crystal 32 is filled in the cell gap of the empty panel 2b, and then the whole lower surface of the second substrate region 24e is etched to form a thin region. Also, the same effect as the first manufacturing method described above can be obtained.

[Second Embodiment] A second embodiment of the present invention will be described below with reference to FIGS. 7 and 8. FIG. 7 is a schematic cross-sectional view showing the overall structure of the liquid crystal display device of the present embodiment, and FIG. 8 is a view of the liquid crystal panel (display means) provided in the liquid crystal display device of the present embodiment when viewed from the touch panel side. FIG. The liquid crystal panel 20 included in the liquid crystal display device 1a according to the present embodiment has a substrate overhanging portion (mounting terminal forming region) formed on the first substrate of the first substrate unit 22a.
Is different from the second board unit 22b.
The formation range of the thin region formed on the substrate is different,
First except that the liquid crystal driving IC is also mounted on the second substrate side
This is the same as the liquid crystal panel 2 of the embodiment. The basic configuration of the touch panel 4 provided in the liquid crystal display device of this embodiment is exactly the same as that of the first embodiment. Also,
Backlight 3 provided in the liquid crystal display device of the present embodiment
7 is the same as that of the first embodiment except that the light guide plate 38 is not provided with the support portion 38b. Therefore, in FIGS. 7 and 8, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As the material of the first substrate 24g of the first substrate unit 22a of the liquid crystal panel 20 of this embodiment, the same material as that used in the first embodiment is used. As shown in FIG. 8, the first substrate 24g has a substrate overhanging portion (mounting terminal forming region) 24i that overhangs the outer periphery of the second substrate 24h. Substrate overhang (mounting terminal formation area) 24
The arrangement position of i is provided not on the same side as the board overhanging portion (mounting terminal forming region) 24c of the first embodiment but on the side adjacent to this side. The first electrode 2 on the first substrate 24g
6a extends toward the board overhanging portion 24i and constitutes a part of a terminal portion pattern (not shown). The liquid crystal driving IC 36 is COG-mounted on the terminal portion pattern formed in the mounting terminal formation region 24i, and the liquid crystal panel 2 and the liquid crystal driving IC 36 are electrically connected. On the other hand, the second substrate 24h of the second substrate unit 22b has the lower surface of the glass substrate (the surface opposite to the liquid crystal layer side) as shown in FIGS. 7 and 8.
A thin region 25 having a thickness of 0.05 mm or more and 0.25 mm or less is formed in a part of the area. The thin region 25 is formed in a substrate portion that is slightly wider than the portion corresponding to the pressed region of the substrate surface of the touch panel 4, in other words, is formed in the portion of the second substrate 24h excluding the outer peripheral portion 27. ing. The mounting terminal formation region 24j is formed outside the thin region 25 of the second substrate 24h, in other words, on the outer peripheral portion 27 of the second substrate 24h. The mounting terminal forming region 24j projects to the outer peripheral side of the first substrate 24g. Since the outer peripheral portion 27 of the second substrate 24h has the same thickness as the original thickness of the glass substrate, the mechanical strength is sufficient. The second board 24h is provided with the board projecting portion 24j.
Since the thin region 25 has a thickness of 0.05 mm or more and 0.25 mm or less as described above, it has a low mechanical strength. Therefore, a liquid crystal driving IC (electronic component) is mounted on the thin region 25a by COF mounting or the like. Since it is difficult to mount by COG mounting or the like, the mounting terminal forming region 24j is provided on the outer peripheral portion 27 of the second substrate 24h having sufficient mechanical strength. Then, the terminal portion pattern 34 formed in the mounting terminal forming region 24j
The liquid crystal driving IC 46 is COG-mounted, and the liquid crystal panel 2 and the liquid crystal driving IC 46 are electrically connected. The portion where the thin region 25 is formed on the second substrate 24h is
As shown in FIG. 7, it is recessed, and the polarizing plate 6b is placed in this recess.
Is fitted. The outer peripheral portion of the light guide plate 38 of the backlight 37 is attached to the outer peripheral portion 27 on the lower surface side of the second substrate 24h.

In the liquid crystal display device 1a of this embodiment,
Also a touch panel on the side of the first substrate 24g of the liquid crystal panel 20.
The back side substrate 8b of No. 4 is attached via the polarizing plate 6a.
Therefore, the liquid crystal display device is similar to the liquid crystal display device of the first embodiment.
The crystal display device can be made thinner and lighter. Also,
Caused by the gap between the touch panel 4 and the liquid crystal panel 20.
The parallax is improved, the display is easier to see, and the touch panel
The operability when pressing 4 is improved. Also, touch panel
An air layer is created in the gap between the panel 4 and the liquid crystal panel 20.
Since it can be prevented, unnecessary reflection due to the above air layer is prevented.
It can be prevented and the image quality can be improved. Furthermore, in this embodiment,
The first substrate 24g and the second substrate 24h are made of a glass substrate.
The glass substrate has a thickness of 0.05 mm or less.
Due to the formation of the thin region 25 having a thickness of 0.25 mm or less,
When the touch panel 4 is pressed, the first substrate 24
Even if the g is bent, the second substrate 24h is replaced by the first substrate 24g.
It is able to follow the flexure and flex, which allows
The local change of the cell
It is possible to prevent the filled liquid crystal 32 from being adversely affected.
Therefore, the display distortion due to the local change of the cell gap is
It can be improved and visibility can be improved. Also, the glass substrate
The heat resistance was superior to that of the plastic film substrate.
Therefore, the first and second substrates constituting the liquid crystal panel 20 are made of glass.
The first substrate formed on the substrate by being composed of the substrate
Transparent electrodes such as electrodes and second electrodes do not have sufficient characteristics.
In addition, it is possible to use the optimum orientation material etc.
The display characteristics can be secured and the heat resistance of the liquid crystal panel is improved.
it can. In addition, in the liquid crystal display device 1a of the present embodiment,
As described above, on the second substrate 24h of the liquid crystal panel 20,
Form a thin area 25 of 0.05 mm or more and 0.25 mm or less
Since it is made, the liquid crystal panel 20 is also lightened by this.
As a result, the weight can be reduced.

In the method of manufacturing the liquid crystal display device 1a of this embodiment, the second substrate base material 124 is used in the step shown in FIG.
a terminal portion pattern is also formed on the second substrate region 24e of b,
Further, in the step shown in FIG. 4B, the second substrate base material 12
When etching 4b, a part of the second substrate region 24e that is slightly wider than a part of the substrate surface of the touch panel 4 corresponding to the pressed region, in other words, the second substrate region 24.
The inner part of the outer peripheral portion of e is etched, and
The cutting positions at the time of cutting the first and second substrate base materials 124a and 124b bonded before the step shown in (c) are different, and the mounting terminals are formed on the second substrate 24h in the step shown in FIG. 4 (d). Terminal part pattern 34 formed in the region 24j
Further, it can be manufactured in the same manner as the first manufacturing method of the first embodiment except that the liquid crystal driving IC 46 is mounted by COG.

In the case of manufacturing a liquid crystal display device having a liquid crystal panel 20 in which electronic components such as the liquid crystal driving IC 46 are mounted on the second substrate 24h, the second substrate base material 124b is made of the second material.
If the thin region is formed over substantially the entire surface of the substrate region 24e, the second substrate obtained from the second substrate base material 124b has a small mechanical strength. Since it is difficult to mount the component by COF mounting, COG mounting, or the like, the second substrate base material 12
4b, a mounting terminal forming region 24j thicker than the thin region 25 is formed in the second substrate region 24e, and terminals formed in the mounting terminal forming region 24j of the second substrate 24h obtained from the second substrate base material 124b. By mounting an electronic component such as a liquid crystal driving IC 46 on the sub-pattern 34 by COG mounting or the like, the liquid crystal panel 20 and the electronic component are electrically connected to each other without causing defects such as cracks and cracks in the substrate during mounting. Therefore, the liquid crystal display device 1a of the present embodiment can be manufactured with high yield.

In the display device of this embodiment,
As an example of the display means for displaying the information input by the touch panel 4, a transflective liquid crystal panel (liquid crystal display element) 2 for monochrome display is used. However, the reflection means is provided with an illuminating means under the second substrate. It may be any of the transmissive type obtained, and the display method is a monochrome display method,
Any of the color display methods may be used, and
The drive system may be either a passive matrix system or an active matrix system.
Further, although the touch panel 4 is attached on the first substrate of the liquid crystal panel via the polarizing plate, the touch panel 4 may be attached directly on the first substrate of the liquid crystal panel. Further, the display means for displaying the information input by the touch panel 4 is not limited to the liquid crystal display element, and any electroluminescence (EL) display (organic EL) can be used as long as it can display the information input by the touch panel 4. Other display means such as an element) may be used.

[0067]

As described above, according to the present invention, the distortion of the display caused by the pressing operation of the input section and the deterioration of the display performance of the display device due to the mounting of the touch panel are improved, and the thickness and the weight are reduced. A display device can be provided.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an overall structure of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a structure of a touch panel included in the liquid crystal display device of FIG.

FIG. 3 is a plan view of a liquid crystal panel included in the liquid crystal display device of FIG. 1 when viewed from the touch panel side.

4A to 4C are process cross-sectional views for explaining the method of manufacturing the liquid crystal display device of FIG.

FIG. 5 is a continuation of the process cross-sectional view of the same.

FIG. 6 is a continuation of the process sectional view of the same.

FIG. 7 is a schematic cross-sectional view showing the overall structure of a liquid crystal display device according to a second embodiment of the present invention.

8 is a plan view of a liquid crystal panel included in the liquid crystal display device of FIG. 7 when viewed from the touch panel side.

FIG. 9 is a schematic configuration sectional view schematically showing a structure of a conventional liquid crystal display device capable of input operation.

[Explanation of symbols]

1, 1a Liquid crystal display device (display device) 2, 20 Liquid crystal panel (display means) 3 input equipment 4 Touch panel (input section) 6a, 6b Polarizing plate (optical substrate) 8a front side substrate 8b Back side substrate 12a, 12b surface electrode 13, 14 Low resistance electrode 22a First substrate unit 22b Second substrate unit 23 Seal material 24a, 24g First substrate 24b, 24h Second substrate 24c, 24i Substrate overhang (mounting terminal formation area) 24d First substrate area 24e Second substrate area 24j Mounting terminal formation area 25 Thin area, 27 Outer periphery 32 liquid crystal 33, 34 Terminal pattern 36,46 Liquid crystal drive IC (electronic parts) 37 Backlight (illumination means) 124a First substrate base material 124b Second substrate base material

Claims (17)

[Claims] 1. A display unit in which an electro-optical material is sandwiched between a first substrate and a second substrate facing each other, and at least 1.
1. A display device comprising a plurality of substrates, the input device detecting position coordinates by inputting by pressing the substrate surface, wherein the input is provided on the first substrate side of the display means. Parts of the substrates are laminated directly or via an optical substrate, the first substrate and the second substrate are made of a glass substrate, and the second substrate has a thin region at least partially thinner than other regions. A display device characterized by being provided. 2. The thickness of the thin region of the second substrate is 0.0.
The display device according to claim 1, wherein the display device has a length of 5 mm or more and 0.25 mm or less. 3. The display device according to claim 1, wherein a thin region is formed over substantially the entire one surface of the second substrate. 4. The display device according to claim 1, wherein the thin region of the second substrate is formed in a portion corresponding to a pressed region of the substrate surface of the input unit. 5. The display device according to claim 3, wherein a mounting terminal formation region for electrically connecting the display means and an electronic component is formed on the first substrate. 6. A mounting terminal forming region for electrically connecting the display means and an electronic component is formed on the second substrate, and the mounting terminal forming region is formed thicker than the thin region. The display device according to claim 4, wherein the display device is a display device. 7. The display device according to claim 5, wherein an electronic component is mounted in the mounting terminal formation region. 8. The liquid crystal display device according to claim 1, wherein the display means is a liquid crystal display device in which a liquid crystal layer is sandwiched between a first substrate and a second substrate facing each other. Display device described. 9. The organic EL device according to claim 1, wherein the display means is an organic EL element in which a light emitting layer containing an organic EL material is sandwiched between a first substrate and a second substrate facing each other. The display device according to any one of claims. 10. The display device according to claim 1, wherein the input unit is a resistive film type touch panel. 11. A display unit having an electro-optical material sandwiched between a first substrate and a second substrate facing each other, and at least one substrate. The input is made by pressing the substrate surface. A method of manufacturing a display device, comprising: an input unit for detecting a position coordinate by means of a display means, wherein an electro-optic material is sandwiched between a first substrate and a second substrate, which are glass substrates facing each other. Before the step of attaching the input unit directly or through the optical substrate on one substrate, it has a first substrate base material having a plurality or a single first substrate region and a plurality or a single second substrate region. Second
Bonding a substrate base material so that corresponding substrate regions face each other; and forming a thin region on at least a part of the second substrate region on the lower surface of the second substrate base material bonded to the first substrate base material. A method of manufacturing a display device, comprising: 12. In the step of forming the thin region, the thickness of the thin region is 0.05 mm or more and 0.25 m.
The method for manufacturing a display device according to claim 11, wherein the display device has a thickness of m or less. 13. The thin region according to claim 11, wherein in the step of forming the thin region, the thin region is formed over substantially the entire surface of the second substrate region on the lower surface of the second substrate base material. Manufacturing method of display device. 14. In the step of forming the thin region, the thin region is formed in a portion of the lower surface of the second substrate base material corresponding to the pressed region of the substrate surface of the input unit. 11. The method according to claim 11 or 12, wherein
A method for manufacturing the display device according to. 15. The first substrate is formed between the step of forming the thin region and the step of adhering the input section directly or via an optical substrate on the first substrate of the display means. 15. The method of manufacturing a display device according to claim 13, further comprising the step of mounting an electronic component in the mounting terminal formation region and electrically connecting the display means and the electronic component. 16. The second substrate is formed between a step of forming the thin region and a step of attaching the input unit directly or via an optical substrate to the first substrate of the display means, 16. The manufacturing of a display device according to claim 14, further comprising a step of mounting an electronic component in a mounting terminal formation region thicker than the thin region and electrically connecting the display means and the electronic component. Method. 17. In the step of forming the thin region, the remaining portion of the lower surface of the second substrate base material is covered with a mask material while the portion forming the thin region is exposed, and the exposed portion is etched. The method of manufacturing a display device according to claim 11, wherein the thin region is formed.