JP2002277856A - Liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the display quality of a liquid crystal display panel, where a touch panel as an input device is arranged in the visible side. SOLUTION: The external form of a first substrate of the liquid crystal display panel and that of a lower substrate of the touch panel are approximately equalized, and they are adhered by adhesive layers. Connection parts, to be connected to a driving circuit, are provided on the same sides. A structure is adopted, where a polarizing plate or a polarizing plate and a phase difference plate are provided on the observer side of the touch panel, or are provided between the touch panel and the liquid crystal display panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a first substrate and a second substrate.
A touch panel (input) that detects input information of an observer using an upper electrode provided on an upper substrate and a lower electrode provided on a lower substrate on a viewer side of a liquid crystal display panel in which a liquid crystal layer is sealed in a gap between the substrates. (Device).

[0002]

2. Description of the Related Art In recent years, a large number of matrix type liquid crystal display panels have been used for displays for various information terminals, measuring instruments and personal computers. In particular, in order to reduce the power consumption of portable information devices, a reflective liquid crystal display device that performs display using a light source from the surroundings where the liquid crystal display device is used, or reflection when the surroundings where the liquid crystal display device is used is bright. There is a transflective liquid crystal display device which is used as a liquid crystal display device and is used by turning on a light source of the liquid crystal display device when the surroundings are dark.

In the case of portable information devices, lightweight and thin are important in terms of portability, and in terms of visibility,
It is preferable to use a liquid crystal display panel having a large area. Therefore, by providing an input unit (input device) on the display surface of the liquid crystal display panel and recognizing the display through the input unit, the size of the liquid crystal display device can be reduced and the display area can be increased.

[0004]

In an input device, an upper electrode is provided on an upper substrate, a lower electrode is provided on a lower substrate, and the upper substrate or the lower substrate is moved by pressing, so that the upper electrode is connected to the lower electrode. There is a resistive touch panel (input device) that reads the coordinate position of a pressing unit by utilizing the fact that an electrode comes into contact with the pressing unit. This method is simple, widely used, and inexpensive, but has a gap between the input device and the liquid crystal display panel because it is arranged on the display surface (display area) of the liquid crystal display panel. Then, reflection occurs at the interface between the air layer and each substrate, so that the contrast or the brightness decreases. Alternatively, image distortion occurs due to distortion of members constituting the touch panel.

[0005] The reason is that the touch panel is provided with a plurality of constituent materials on the viewer side of the liquid crystal display panel, so that the coloring of the materials due to the absorption of light of each material or the reflection, absorption or interference due to the difference in refractive index between the materials in contact with each other. Therefore, compared to the case where the liquid crystal display panel is used alone, there is a problem that darkness or a lowering of the contrast ratio, or coloring and reflection of light from the touch panel reduce light incidence on the liquid crystal display panel. ing.

As an improvement method, a method of reducing reflection by inserting an optical member for reducing the difference in refractive index between the respective materials, a method of reducing the absorption amount by thinning each material, or a reduction of the absorption rate There is a method of selecting a material or a method of reducing the number of constituent members. In addition, a polarizing plate is arranged on the observer side of the upper substrate side of the touch panel, and a quarter-wave (lambda: λ) plate is arranged on the opposite side of the observer of the polarizer to prevent reflection of the touch panel. However, the purpose is to prevent reflection from the touch panel, and another polarizing plate is placed between the liquid crystal display panel and the touch panel. Is transmitted twice, and absorption occurs, resulting in a dark display.

Further, when a film substrate is used as the upper substrate or the lower substrate of the input device, undulation (distortion) of the film substrate greatly increases image distortion and nonuniform reflection intensity of the liquid crystal display panel.

There is also a configuration in which the first substrate of the liquid crystal display panel is also used as a lower substrate of the input device. However, a step of forming a first electrode provided on the liquid crystal layer side of the first substrate of the liquid crystal display panel; Alternatively, the uniformity of the transparent conductive film used for the input device in the production process of the liquid crystal display panel, the prevention of scratches, the resistance change of the electrode material due to the mutual processing temperature occurs, high-quality liquid crystal display device, It was not enough.

[Object of the Invention] The present invention focuses on this point, and an object of the present invention is to reduce the thickness of an upper substrate and a lower substrate constituting an input device and to view a liquid crystal display panel through the input device. Improving visibility, preventing image distortion due to the input device, bringing the input device and the display surface of the liquid crystal display panel closer together, improving contrast, reducing brightness,
Achieving low cost.

[0010]

In order to achieve the above object, the present invention employs the following structure.

In the liquid crystal display device according to the present invention, the first electrode provided on the transparent first substrate and the second electrode provided on the second substrate are provided with a liquid crystal layer sealed in a predetermined gap as a sealing material. To form a liquid crystal display panel, and further, on the observer side of the first substrate, an upper substrate composed of a glass substrate having an upper electrode composed of a transparent conductive film and a lower electrode composed of a transparent conductive film than the observer side. A lower substrate made of a glass substrate having an adhesive for a touch panel to form an input device;
A part of a liquid crystal panel connecting portion for connecting a driving circuit for applying a predetermined signal to a liquid crystal layer of a liquid crystal display panel, and an input device having an mutual adhesive layer between the substrate and the lower substrate; And an input device connecting part for applying a predetermined signal from the drive circuit to the same side.

[0012] Further, a mutual bonding layer is provided between the first substrate and the lower substrate, and at least the first substrate constituting the liquid crystal display panel is provided.
On the substrate, there is provided a mounting area for mounting the integrated circuit by a chip-on-glass mounting method, and in an area overlapping with the mounting area, an input device connection for applying a predetermined signal from a drive circuit to the input device. It has a part.

The input device provided in the liquid crystal display device of the present invention has at least four electrodes consisting of a pair of X electrodes and a pair of Y electrodes for position detection on the upper substrate or the lower substrate. At least four electrodes are wired by an X wiring electrode and a Y wiring electrode to an input device connection portion for connecting to a drive circuit of the input device, and at least three of the X wiring electrode and the Y wiring electrode are connected to a liquid crystal display. It is provided in a region overlapping with a liquid crystal display panel connection portion for connection with a panel driving circuit or a region overlapping with a mounting region where an integrated circuit is provided.

In the liquid crystal display device of the present invention, a part of a liquid crystal panel connecting portion for connecting to a driving circuit for applying a predetermined signal to a liquid crystal layer of the liquid crystal display panel and a predetermined signal from the driving circuit to an input device. Input device connection to apply
The mounting area is arranged on the same side, and the connection between the drive circuit and the input device and the connection between the liquid crystal display panel and the drive circuit are provided with connection means, respectively, and the connection means uses a flexible printed circuit board. And an integrated flexible printed circuit board.

A flexible printed circuit board for connecting an input device and a drive circuit of a liquid crystal display device according to the present invention is characterized in that it has a portion inserted between an upper substrate and a lower substrate constituting the input device.

The input device of the liquid crystal display device of the present invention is connected to the drive circuit via the side wall of the first substrate of the liquid crystal display panel and further in contact with the side wall of the first substrate. Is performed.

The present invention is characterized in that a protective film made of a transparent film is provided on the viewer side of the upper substrate constituting the input device of the liquid crystal display device of the present invention. Further, the protective film is characterized by having a polarizing property.

A protective film made of a transparent film is provided on the observer side of the upper substrate constituting the input device of the liquid crystal display device of the present invention.
An ultraviolet absorber is provided in the transparent film or in at least one position of the adhesive layer for bonding the transparent film and the upper substrate.

The upper substrate constituting the input device of the liquid crystal display device of the present invention has a protective film made of a transparent film on the observer side, and the observer side surface of the transparent film has
It is characterized by having a scratch prevention layer for preventing scratches on the transparent film.

A protective film made of a transparent film is provided on the observer side of the upper substrate constituting the input device of the liquid crystal display device of the present invention.
It is characterized by having an anti-scratch layer and an anti-reflection layer for preventing scratches on the transparent film. Further, at least one of the protective film, the scratch prevention layer, and the antireflection film is replaceable.

A liquid is sealed between the upper substrate and the lower substrate constituting the input device of the liquid crystal display device according to the present invention. The liquid is an optically isotropic liquid. Alternatively, when a polarizing plate is not arranged on the viewer side of the first substrate of the input device, the input device is an optically anisotropic liquid.

On the observer side of the upper substrate constituting the input device of the liquid crystal display device of the present invention, at least one retardation plate and a polarizing plate are laminated from the upper substrate side. It is characterized by comprising a liquid crystal polymer.

A polarizing plate is provided on the observer side of the upper substrate constituting the input device of the liquid crystal display device of the present invention, and is arranged on the upper substrate side of the input device in order to improve the sensitivity of the input device. Except for the protective layer, the input device is laminated from the upper substrate side in the order of the adhesive layer, the polarizing layer, the adhesive layer, and the protective film.

On the observer side of the upper substrate constituting the input device of the liquid crystal display device of the present invention, at least one retardation plate and a polarizing plate are provided from the upper substrate side to improve the sensitivity of the input device. Except for the protective layer of the polarizing plate and the protective layer of the retardation plate arranged on the upper substrate side of the input device, from the upper substrate side of the input device,
The adhesive layer, the retardation layer, the adhesive layer, the polarizing layer, the adhesive layer, and the protective film are laminated in this order.

The liquid crystal display device of the present invention has a polarizing plate between the first substrate forming the liquid crystal display panel and the lower substrate forming the input device. And a substrate on both sides of the lower substrate and the lower substrate. Further, the bonding between the polarizing plate and the substrate is performed by heat treatment at a temperature of 100 ° C. or lower, or an ultraviolet adhesive resin. Further, the polarizing plate is characterized in that the polarizing plate is formed of only a polarizing layer and has a shape excluding a moisture protection layer.

The liquid crystal display device of the present invention has a polarizing plate and a phase difference plate between the first substrate constituting the liquid crystal display panel and the lower substrate constituting the input device. The polarizing plate or the phase difference plate is characterized by being adhered to substrates on both sides of the first substrate and the lower substrate. Further, the bonding between the polarizing plate and the lower substrate of the input device is performed by a heat treatment at 100 ° C. or less.
Alternatively, it is characterized by being an ultraviolet adhesive resin. Further, the bonding between the retardation plate and the first substrate of the liquid crystal display panel is characterized by a heat treatment at 100 ° C. or lower or an ultraviolet-ray adhesive resin.

The liquid crystal display device of the present invention has a polarizing plate between the first substrate forming the liquid crystal display panel and the lower substrate forming the input device. The first substrate, the lower substrate, and the polarizing plate have substantially the same outer shape and are substantially overlapped on the same side.

The liquid crystal display device of the present invention may be provided between the protective film disposed on the viewer side of the input device and the upper substrate of the input device, or between the polarizing plate or retardation plate and the upper substrate, or The first part of the substrate and the liquid crystal display panel
A scattering layer between the substrate and the substrate. Further, the scattering layer is a diffusion paste containing particles having different refractive indexes in the adhesive.

In the liquid crystal display device of the present invention, the first electrode provided on the transparent first substrate, the switching element provided on the second substrate, and the pixel electrode connected to the switching element are sealed in a predetermined gap. A liquid crystal display panel is formed by laminating a liquid crystal layer to be formed with a sealant, and a first electrode provided on the first substrate has a transparent conductive film over substantially the entire surface.

[Operation] Further, the connection part between the touch panel and the drive circuit is arranged on the same side as the connection part between the liquid crystal display panel and the drive circuit, and the area required for connection is shared.
In particular, in the case of the chip-on-glass (COG) mounting method and the COF mounting method, since the mounting area of the integrated circuit is used as the mounting area with the driving circuit of the touch panel, the effective display area of the liquid crystal display device is increased. It is possible to do.

The X electrode of the touch panel or the Y electrode
The number of the X wiring electrodes and the number of the Y wiring electrodes up to the input device connection portion for connecting the electrodes and the driving circuit are four, and at least two of them are connected to the liquid crystal display panel for connecting to the driving circuit of the liquid crystal display panel. By providing a region overlapping with the portion or a region overlapping with the mounting portion on which the integrated circuit (IC) is provided, a region used for routing the wiring electrodes can be sufficiently provided on the outer periphery of the display region. That is, a gap between the X electrode, the Y electrode, and the wiring electrode of the touch panel, or a gap sufficient to prevent an electrical short circuit between the X electrode and the Y electrode, or between the X wiring electrode and the Y wiring electrode, is planarized. Accordingly, it is possible to prevent the thickness unevenness of the upper substrate and the lower substrate of the input device due to the thickness of the electrode, thereby preventing image distortion.

Also, the flexible printed circuit board as the liquid crystal display panel connecting means for connecting the liquid crystal display panel to the driving circuit and the flexible printed circuit board as the connecting means for connecting the input device and the driving circuit are integrated. Thereby, the connection area and the area of the flexible printed circuit board can be reduced. Furthermore, the flexible printed circuit board can be inserted between the upper board and the lower board of the input device, and furthermore, the periphery of the mounting portion of the flexible printed board can be sealed with a silicone resin to protect the terminals made of silver electrodes. It becomes possible.

The input device connection means or the liquid crystal display panel connection means is connected via the side wall of the first substrate of the liquid crystal display panel or the side wall of the lower substrate of the input device, so that, for example, the touch panel alone can be used. By using the lower substrate of the touch panel and the side wall of the first substrate, the strength is reinforced and the reliability can be improved as compared with the case of holding the flexible printed circuit board.

Since the input surface of the input device is a glass substrate, the input device may be broken when pressed hard and sharply with a sharp point. Therefore, a protective film is laminated on the upper substrate of the input device. Furthermore, a liquid crystal display is bonded to the lower substrate of the input device by sealing the liquid between the upper substrate and the lower substrate of the input device, and dispersing and pressing the minute pressure of the upper substrate directly to the lower substrate. Since the first substrate of the panel is uniformly dispersed over a wide area and pressurized, it is possible to prevent display disturbance at the time of input.

Further, by using a polarizing plate as the protective film provided on the upper substrate of the input device, compared with the case where a polarizing plate is provided between the conventional input device and the liquid crystal display panel, the protective film on the upper substrate of the input device is reduced. By adhering the polarizing plate to the thin scratches and dirt with an adhesive layer, the visibility can be reduced. Further, since the light incident on the input device can be reduced by half by the polarizing plate, the visibility of dust and the like in the touch panel can be reduced.

Further, when a conventional polarizing plate is provided on the input surface of the input device, the input sensitivity is reduced because the polarizing plate has protective layers above and below the polarizing layer. for that reason,
In the present invention, only the polarizing layer is provided on the input surface of the input device. Further, on the input surface of the polarizing plate, a configuration is employed in which a hard coat layer for preventing damage to the film or an antireflection layer is directly formed.

Further, by providing a polarizing plate or a polarizing plate and a phase difference plate between the lower substrate of the input device and the first substrate of the liquid crystal display panel, the liquid crystal display panel and the input device are integrated. And the strength can be improved. Furthermore, by using only the polarizing layer as the polarizing plate and using only the retardation layer and the adhesive layer as the retardation plate, a thin and reliable configuration can be achieved. In particular,
By bonding the lower substrate of the touch panel and the first substrate of the liquid crystal display panel to a glass substrate, and further bonding the lower substrate, the first substrate, and a polarizing layer and a retardation layer provided therebetween with an adhesive material, Since there is no water permeability, and the water permeability does not increase even at a high temperature, for example, about 100 ° C., the humidity resistance of the polarizing layer or the retardation layer can be improved.

Further, the polarizing layer or the retardation layer provided between the lower substrate and the first substrate is smaller than the outer shapes of the lower substrate and the first substrate, and further enters inside from the outer peripheral portion. That is, when the polarizing layer or the retardation layer protrudes from the outer shape of the lower substrate or the first substrate, the polarizing layer,
Alternatively, because the retardation layer is directly deteriorated by moisture, the reliability cannot be improved.

Further, a diffusion layer is formed between the protective film and the upper substrate of the input device, between the polarizing plate or the phase difference plate and the upper substrate, or between the lower substrate and the first substrate of the liquid crystal display panel. By providing, the unnecessary of the liquid crystal display panel,
Glaring reflection can be prevented. In the present invention, the diffusion layer uses a diffusion paste containing a transparent spacer having a different refractive index for the adhesive, and in the present invention, the members that enter and exit through the diffusion paste are bonded to each other. By using diffusion glue for
Display quality can be improved.

Further, the lower substrate constituting the input device and the first substrate constituting the liquid crystal display panel are bonded directly via an adhesive or via a polarizing plate or the like to be integrated with each other. The structure having a transparent conductive film on almost the entire surface of the substrate is simple and preferable. It is preferable to use an active matrix type in which a switching element is provided for each pixel electrode as a structure which can display by arranging a plurality of pixel electrodes on a matrix.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> [Configuration of Liquid Crystal Display Device in Present Embodiment: FIGS. 1, 2, 3, 4, 5, 6, and 7] A liquid crystal display device with an input device according to the best mode for carrying out the invention will be described with reference to the drawings. The feature of this embodiment is that the touch panel and the liquid crystal display panel are bonded to each other with a mutual bonding layer using a super twisted nematic (STN) liquid crystal, and the lower substrate of the touch panel and the first substrate of the liquid crystal display panel are bonded. The outer shape of the lower substrate is slightly smaller than that of the first substrate, and has a configuration in which the lower substrate substantially overlaps the same side. Furthermore, the mounting position of the touch panel and the flexible printed circuit board is that they are mounted on the same side where the liquid crystal display panel and the flexible printed circuit board are mounted.

FIG. 1 is a schematic perspective view of a liquid crystal display device according to this embodiment of the present invention. FIG. 2 is a cross-sectional view of FIG.
It is sectional drawing of the liquid crystal display device in A line. FIG. 3 is a cross-sectional view showing a portion of the touch panel and the liquid crystal display panel shown in FIG. 2, and FIG. 4 is a three-dimensional schematic diagram showing a structure of the touch panel. FIG. 5 is an enlarged cross-sectional view taken along line BB of FIG. 4 of the touch panel as an input device. FIG. 6 is a plan view in which a flexible printed circuit board for connecting a touch panel and a driving circuit of a liquid crystal display panel is mounted. FIG.
FIG. 7 is a cross-sectional view taken along the line CC of FIG. 6 and shows a state in which the flexible printed circuit board of FIG. Hereinafter, FIGS. 1, 2, 3, 4, and 5 will be described.
This embodiment will be described with reference to FIGS. 6 and 7 alternately.

As shown in FIG. 3, the liquid crystal display panel of the present invention has a structure in which a second substrate 6 made of a 0.5 mm glass plate is provided with a resin provided on the second substrate 6 and having an uneven surface. A 0.1 μm reflector 8 made of a film (not shown) and an aluminum film provided on a resin film; a red (R) color filter 9, a green (G) color filter 10, and blue provided on the reflector 8. (B) A color filter 11, a color filter, a flattening protective layer 12 for maintaining the properties of the color filter 8 and flattening, and a second electrode 7 made of a striped transparent conductive film are provided.

On the first substrate 1, a first electrode made of a stripe-shaped transparent conductive film is provided. The intersection of the first electrode 2 and the second electrode 7 becomes a pixel portion. The first substrate 1 and the second substrate 6 are bonded to each other with a predetermined gap provided by a sealing material 16 made of epoxy resin, a liquid crystal layer 13 is injected into the gap, and a sealing material (not shown) is used. Seal. Thus, a liquid crystal display panel is completed. In the liquid crystal layer 13, the liquid crystal molecules on the first substrate 1 side are shifted by 30 degrees from the 3 o'clock direction to the 6 o'clock direction, and the liquid crystal molecules on the second substrate 6 side are shifted by 210 degrees from the 3 o'clock direction to the 12 o'clock direction. In other words, a 240 degree super twisted nematic (STN) liquid crystal is used, which is shifted by 30 degrees from 9 o'clock to 6 o'clock, and twists counterclockwise from the first substrate 1 side to the second substrate 6 side by 240 degrees. are doing.

The liquid crystal layer 1 of the first substrate 1 of the liquid crystal display panel
On the side opposite to the surface facing 5, a mutual adhesive layer 44 made of a transparent acrylic resin is provided.

As shown in FIGS. 4 and 5, a touch panel as an input device includes an upper electrode 25 made of a transparent conductive film provided on an upper substrate 24 made of a transparent glass substrate having a thickness of 0.1 mm. An X electrode 28 made of silver paste provided at both ends of the electrode 25 in the X-axis direction, and an X electrode connected to the X electrode 28
A wiring electrode 29 and an X transfer electrode 30 are provided. The resistance of the upper electrode 25 is several hundred ohms (Ω), and the resistance of the X electrode 28 is several ohms (Ω). X transfer electrode 30
Are provided around the upper substrate 24 and are electrically connected to the X connection electrodes 34 made of silver paste provided on the lower substrate 26 by the conductive paste 38.

Further, on the lower substrate 26, a short-circuit preventing insulating film 35 is provided in order to prevent an electric short-circuit with an electrode provided on the upper substrate 24. The region where the short prevention insulating film 35 is provided is on the outer peripheral portion of the upper electrode 25, on the X electrode 28, and on the X wiring electrode 29.

On a lower substrate 26 made of a transparent glass substrate having a thickness of 0.2 mm and facing the upper substrate 24, a lower electrode 27 made of a transparent conductive film and two ends of the lower electrode 27 in the Y-axis direction are provided. Y electrode 31 made of silver paste to be provided and Y electrode 3
A Y wiring electrode 32 and a Y connection electrode 33 to be connected to 1 are provided. Here, the X connection electrode 34 and the Y connection electrode 33 are input device connection portions that connect the touch panel and the drive circuit.

The outer peripheral portion of the lower substrate 26 has
Alternatively, in order to connect to the touch panel FPC 61 formed of a flexible printed circuit board (FPC) connected to the drive circuit board 64 shown in FIG.
And a connection electrode 34. The connection between the connection electrodes 33 and 34 and the FPC 61 for a touch panel is performed using an anisotropic conductive adhesive (not shown) in which conductive particles are mixed with a thermosetting resin. The resistance of the lower electrode 27 is several hundred ohms (Ω), and the resistance of the Y electrode 31 is several ohms (Ω). A dome-shaped spacer 39 is provided on the lower electrode 27. The dome-shaped spacer 39 is formed by a photolithography process or a printing process, and has a height of 5 to 10 μm and a size of 10 to 15 μm.

The upper substrate 21 and the lower substrate 26 are separated from each other by a sealing material 40 for a touch panel made of acrylic resin.
Adhesion is provided with a gap of 0 μm.

On the observer side of the upper substrate 24 of the touch panel, from the upper substrate 24 side, a second retardation plate 49, a twisted retardation plate 46 as a second retardation plate, and a first polarizing plate 45
Are laminated in this order. The liquid crystal molecules on the touch panel side (lower side) are shifted from the 3 o'clock direction to the 12 o'clock direction by 58 degrees.
The upper liquid crystal molecules are 125 degrees from the 3 o'clock direction to 6 o'clock direction (35 degrees from the 6 o'clock direction to 9 o'clock direction), and the twist angle is 177 clockwise from the upper liquid crystal molecules.
Twisted. The polarizing plate 45 has an absorption axis arranged at 35 degrees from the 3 o'clock direction to the 12 o'clock direction. With the above-described configuration, good contrast and color display can be performed, so that good display quality can be ensured without lowering the input sensitivity of the touch panel.

The retardation plate is formed of a liquid crystalline polymer having a blur structure by using triacetyl cellulose (TAC).
Use a film that has been oriented on a film or polyethylene terephthalate (PET) film, applied to the liquid crystal at a high temperature of about 150 ° C, adjusted the twist angle, cooled to room temperature, and fixed its twisted state. I do.

Alternatively, a twisted angle of -177 degrees, a birefringence is obtained by using a film formed by transferring a liquid crystalline polymer to a TAC film after fixing the twisted state on a separately prepared film subjected to an orientation treatment. A clockwise twisted phase difference plate having a nd value of 730 nanometers (nm) indicating the property is used.

Since the polarizing plate 45 preferably has a high degree of polarization and a high transmittance, the transmittance is 45% and the degree of polarization is 9%.
9.9% of the material was used. Further, a plurality of inorganic thin films having different refractive indices are coated on the viewer side of the polarizing plate 45 by a vacuum evaporation method or a sputtering method, or one to two layers.
The display quality of the liquid crystal display device can be improved by reducing the reflectance on the surface of the polarizing plate 45 by coating the organic material of the layer. Further, in order to input from the surface of the polarizing plate 45, an observer touches the polarizing plate 45, and to prevent contamination of the surface of the polarizing plate 45, a fluororesin is coated as a protective film. Further, a method of forming a hard coat layer made of a silicon oxide film is effective in preventing the polarizing plate 45 from being damaged.

When it is expensive to perform the treatment on the polarizing plate 45, an anti-reflection treatment and a hard coating treatment are performed on a polyethylene terephthalate (PET) film, and an acrylic adhesive is formed on the polarizing plate 45 as a protective film. It is also effective to bond them.

FIG. 2 shows a configuration in which the laminated function unit of the touch panel and the liquid crystal display panel having the above-described configuration is arranged in the portable information device case 51 and the back cover 52. The touch panel is
The touch panel FPC 61 is connected to a drive circuit board 64 having a drive circuit, and outputs and outputs a predetermined signal. The liquid crystal display panel is connected to a drive circuit board 64 at a liquid crystal display panel connection portion by a liquid crystal display panel FPC 63 as liquid crystal display panel connection means, and performs input / output of predetermined signals. An integrated circuit 62 for converting a signal of the drive circuit board 64 into a display signal of the liquid crystal display panel is provided on the first substrate 1 constituting the liquid crystal display panel.
It is mounted in the mounting area by a glass (COG) method.

The drive circuit board 64 has a battery terminal (+) 73 and a battery terminal (−) 7 for connection with the battery 72.
4 are connected. Further, the communication sensor 58 for performing communication with an external device and the drive circuit board 64 are connected by a communication connection terminal 71. "

As shown in FIGS. 1 and 2, the portable information device has a first button 55, a second button 56, a third button 57, and a communication button for changing display contents on a portable information device case 51. It has a sensor 58 and an on / off switch 59. Communication sensors are for sending and receiving or receiving,
A GPS sensor for position information, or a Bluetooth transmission / reception sensor or an infrared transmission / reception sensor.

In the display area 75 composed of the pixel portion of the liquid crystal display panel, when the input pen 80 presses the touch panel, the input character 76 is recognized by the circuit via the touch panel, and the character recognized by the liquid crystal display panel is recognized. Is displayed. FIG. 1 shows a state where M is recognized.

As is clear from the above description, by employing this embodiment of the present invention, it is possible to prevent reflection inside the touch panel, prevent reflection between the touch panel and the liquid crystal display panel, and reduce the number of components. To prevent a decrease in transmittance due to reflection, coloring, and light absorption,
Improve the display quality of liquid crystal display devices that perform reflective display,
In particular, it is possible to improve the contrast and the saturation.

The first electrode and the second electrode of the liquid crystal display panel
In order to apply a predetermined driving waveform to the electrodes, an integrated circuit (IC) 6 is connected to the liquid crystal display panel connecting portion on the first substrate 1.
2 Similarly, a second integrated circuit (IC) 19 is provided on the second substrate. As a method for connecting the second electrode on the second substrate 6 to a connection electrode (not shown) on the first substrate 1, the sealing material 14 is formed by kneading conductive particles and an insulating sealing material. Is used to conduct the upper and lower electrodes by the conductive particles.

When the flexible printed circuit board 63 of the liquid crystal display panel is crimped at the connection portion of the liquid crystal display panel, or when the integrated circuit (IC) 62 is mounted by the chip-on-glass mounting method, the touch panel is formed. Since the substrate 24 is not provided with a mounting portion, damage to the upper substrate 24 can be prevented. Further, since the lower substrate 26 and the first substrate 1 of the liquid crystal display panel are integrated by the mutual adhesive layer 44, even if the lower substrate 26 is held, there is no breakage. Further, the outer peripheral portion of the lower substrate 26 is
Is provided on the inner side of about 200 to 400 μm, so that the outer peripheral portion of the lower substrate 26 is not damaged.

Further, even when the outer peripheral portion of the first substrate 1 is chamfered, by providing the outer peripheral portion of the lower substrate 26 inside 400 μm, the lower substrate 26 is not damaged and a touch panel is formed. The upper substrate 24 and the lower substrate 26 can be made of thin glass.

Further, as shown in FIG. 7, the FPC 61 for the touch panel and the FPC 63 for the liquid crystal display panel overlap with each other and are mutually reinforced when incorporated in the liquid crystal display device. Particularly, in the vicinity of the lower substrate 26 and the first substrate 1, a portion overlapping each other is large, so that the mounting portion can be reinforced. Also, FPC61 for touch panel
Double-sided tape 69 between the FPC 63 and the LCD panel
By adhering, the strength can be further increased. Further, a liquid crystal display panel reinforcing material 81 is applied to a portion of the liquid crystal display panel FPC 63 mounted on the first substrate 1, and a touch panel reinforcing material is applied to the portion of the touch panel FPC 61 mounted on the lower substrate 26. Lumber 8
2 and a mutual reinforcing material 83 is applied between the FPC 61 for the touch panel and the FPC 63 for the liquid crystal display panel, thereby improving the reliability of the mounting portion and preventing the lower substrate 26 which is a thin glass substrate from being damaged. Can be prevented.

As is clear from the above description, the lower substrate 26 forming the touch panel and the first substrate 1 forming the liquid crystal display panel are bonded to each other by the mutual bonding layer 44, and the outer peripheral portion of the lower substrate 26 is Almost the same side as the first substrate 1,
Alternatively, by providing the glass substrate slightly inside, it is possible to reduce the thickness of the glass substrate forming the touch panel. Further, flexible printed circuit boards 63 and 61 are provided on the same side as a liquid crystal display panel connecting means for connecting to the driving circuit and an input device connecting means. Further, the mounting portions of the flexible printed boards 63 and 61 and the respective boards are shifted to prevent mutual influence during mounting (pressure bonding), thereby enabling stable connection. In other words, it is clear that making the position of the flexible printed circuit board the same side and shifting the mounting portion of the flexible printed circuit board are not merely a design improvement but have sufficient structural effects and functions.

<Second Embodiment> [Structure of liquid crystal display device in this embodiment: FIG. 8] A liquid crystal display device with an input device in this embodiment of the present invention will be described below with reference to the drawings. The feature of this embodiment is that the size of the upper substrate and the size of the lower substrate constituting the touch panel which is an input device are substantially equal, and the size of the first substrate of the liquid crystal display panel which fixes the touch panel with the mutual adhesive layer is also equal. Another feature is that the touch panel FPC is inserted and fixed between the upper substrate and the lower substrate. Further, the touch panel FPC and the liquid crystal display panel FPC are integrated FPCs. Furthermore, between the liquid crystal display panel and the touch panel, there is a polarizing plate and a retardation plate, and on the upper substrate of the touch panel, to prevent breakage of the thin glass,
Providing a protective film and omitting the components provided on the input surface of the touch panel to increase input sensitivity, and at the same time, bonding a polarizing plate and a retardation plate between the lower substrate and the first substrate to improve reliability. That is the point. FIG. 8 is a sectional view of the liquid crystal display device of the present invention, taken along line CC of FIG. Hereinafter, the present embodiment will be described with reference to FIG. In addition, about the structure similar to 1st Embodiment, it demonstrates using the same code | symbol.

In this embodiment, the structure of the liquid crystal display panel in the first embodiment is substantially the same as that of the first embodiment. However, as the reflector 8, a part of the light of 0.02 μm made of an aluminum film is transmitted and the remaining light is transmitted. , A so-called half-mirror transflector. In the present embodiment, by setting the aluminum film thickness to 0.02 μm, 10 to 20
% Of light is transmitted and the remaining 80 to 90% of the light is reflected.

Liquid crystal layer 1 of first substrate 1 of liquid crystal display panel
On the side opposite to the surface facing 5, a mutual adhesive layer 44, a retardation plate 46, a first polarizing plate 45 and a mutual adhesive layer 44 are laminated in this order, and a transparent glass substrate forming a touch panel is formed by the mutual adhesive layer 44. Is adhered to the lower substrate 26.

The configuration of the touch panel is almost the same as that of the first embodiment. The upper substrate 24 of the touch panel is 200 μm inside from each side of the lower substrate 26. Further, the FPC 61 for the liquid crystal display panel is provided on the lower substrate 2 of the touch panel.
6 and are adhered to each other by an anisotropic conductive sealing material 23. The anisotropic conductive sealing material 23 has the conductive particles 22 kneaded into an insulating sealing material. Since the upper substrate 26 is made of thin glass, the conductive sealing material 23 of the FPC 61 for a touch panel is used.
When thermocompression-bonding was performed, the thickness was about 0.1 mm, which was the best because it was bent.

Further, the flexible printed circuit board mounted on the first substrate 1 constituting the liquid crystal display panel is integral with the FPC 61 for the touch panel, and branches off in the middle to form the FPC 61 'for the liquid crystal display panel.

Further, since the upper substrate 24 of the touch panel is made of thin glass, it is prevented from being damaged by the protective film 66. On the viewer side on the protective film 66, a hard coat layer and an antireflection layer are provided.

Further, between the touch panel and the liquid crystal display panel, two layers of the mutual adhesive layer 44, the polarizing plate 45 and the retardation plate 46 are provided.
Is provided, the touch panel has elasticity, and the upper substrate 24 is pressed by pressure for input from the upper substrate 24 side of the touch panel.
Even when the lower substrate 26 is in contact with the lower substrate 26 and the lower substrate 26 is slightly bent, the bending of the lower substrate 26 is dispersed and transmitted to the first substrate 1 constituting the liquid crystal display panel, and the first substrate The distortion of No. 1 hardly occurs and hardly propagates to the liquid crystal layer 13, so that image distortion at the time of input to the touch panel can be prevented.

<Third Embodiment> [Structure of Liquid Crystal Display Device in Third Embodiment: FIG.
FIG. 10] A liquid crystal display device with an input device according to this embodiment of the present invention will be described below with reference to the drawings. The feature of the present embodiment is that a diffusibility is imparted to the mutual adhesion layer between the liquid crystal display panel and the touch panel as an input device. Further, the present invention is characterized in that the polarizing layer and the retardation layer are provided between the liquid crystal display panel and the touch panel. The polarizing layer is provided alone without being held by the protective layer, and the retardation layer is also provided alone without being held by the protective layer. As a result, the thickness can be reduced. FIG. 9 is a plan view showing a part of the liquid crystal display device in FIG. 3 of the present invention, and is a diagram showing an outer shape of a liquid crystal display panel, an outer shape of a touch panel, and an outer shape of a polarizing layer. FIG. 10 is a cross-sectional view taken along line DD of FIG. Hereinafter, the third embodiment will be described with reference to FIGS. 9 and 10 alternately. In addition, about the structure similar to 1st Embodiment, it demonstrates using the same code | symbol.

The structure of the liquid crystal display panel of this embodiment is almost the same as that of the liquid crystal display panel of the first embodiment, but a 0.3 mm thick transparent glass substrate is used as the second substrate 6. The reflecting plate 8 is a so-called half mirror that transmits some light and reflects the remaining light. In this embodiment, the aluminum film thickness is 0.02
μm allows 10 to 20% of light to pass through,
The characteristic of reflecting the remaining 80 to 90% of the light was adopted.

Further, a transparent glass substrate having a thickness of 0.3 mm is used as the first substrate 1, and the first substrate 1 and the second substrate 6 are fixed to each other by a sealing material 16 made of an ultraviolet curable acrylic resin. A gap is provided and bonding is performed.
5 were injected.

The liquid crystal layer 1 of the first substrate 1 of the liquid crystal display panel
On the side opposite to the surface facing 5, a styrene resin ball is dispersed in an acrylic adhesive, and a scattering layer 6 having a light scattering property due to a difference in refractive index between the acrylic adhesive and the styrene resin ball.
7 (inter-adhesion layer 44), a retardation layer 92, an adhesive layer (not shown), and a polarizing layer 91. Lower substrate 2 made of a transparent glass substrate constituting a touch panel by 44
6 is adhered.

The polarizing layer 91 used in the present embodiment is a polarizing layer only and has no upper and lower protective layers made of an optically isotropic film such as TAD. Similarly, the retardation layer 92 has no protective layer. The polarizing layer 91 and the retardation layer 92 are laminated with an adhesive, and further, the mutual adhesive layer 4 is attached to the lower substrate 26 of the touch panel and the first substrate 1 of the liquid crystal display panel.
4 and the substrates on both sides are made of glass, so that the ingress of humidity can be prevented.

The configuration of the touch panel is almost the same as that of the first embodiment. As shown in FIG. 9, the outer shape 86 of the touch panel of the upper substrate 24 and the lower substrate 26 of the touch panel is 200 μm inside each side of the outer shape 85 of the polarizing plate of the polarizing layer 91. Further, from the polarizing plate outer shape 85, the outer shape of the first substrate 1 constituting the touch panel is shaped such that each side is located 300 μm outside. That is, the first substrate 1, the polarizer outer shape 85, and the touch panel outer shape 86 are located inside in this order. By employing the above configuration, it is possible to prevent damage around the touch panel made of a thin glass substrate, and it is possible to prevent damage when incorporated in a liquid crystal display device.

Further, the connection between the liquid crystal display panel and the drive circuit is made at the liquid crystal display panel connection portion by an insulating rubber and an anisotropic conductive connector in which conductive particles are dispersed in the insulating rubber.

Further, between the touch panel and the liquid crystal display panel, two layers of the mutual adhesive layer 44, the polarizing plate 45 and the retardation plate 46 are provided.
Is provided, the touch panel has elasticity, and the upper substrate 24 is pressed by pressure for input from the upper substrate 24 side of the touch panel.
Even when the lower substrate 26 is in contact with the lower substrate 26 and the lower substrate 26 is slightly bent, the bending of the lower substrate 26 is dispersed and transmitted to the first substrate 1 constituting the liquid crystal display panel, and the first substrate The distortion of No. 1 hardly occurs and hardly propagates to the liquid crystal layer 13, so that image distortion at the time of input to the touch panel can be prevented.

Fourth Embodiment [Structure of Liquid Crystal Display Device in Present Embodiment: FIG. 11] A liquid crystal display device with an input device in the present embodiment of the present invention will be described below with reference to the drawings. The feature of this embodiment is that the upper substrate and the lower substrate constituting the touch panel are used as film substrates, and a gap between the upper substrate and the lower substrate is sealed with a liquid encapsulating medium. Further, the first substrate and the second substrate
Is a plastic substrate, and a second polarizing plate and a reflecting plate are provided below the second substrate. FIG.
FIG. 7 is a cross-sectional view taken along line CC of FIG. 6 in the liquid crystal display device of the present invention. The present embodiment will be described below with reference to FIG. In addition, about the structure similar to 1st Embodiment, it demonstrates using the same code | symbol.

The difference between the structure of the liquid crystal display panel in the first embodiment and the structure of the liquid crystal display panel in the present embodiment is that the second substrate 6 made of a 0.3 mm thick transparent plastic substrate has a silicon oxide film (SiO 2) (a gas barrier layer). (Not shown), and a 0.3 mm thick transparent plastic substrate is used for the first substrate 1.

The structure of the touch panel is almost the same as that of the first embodiment, except that the upper substrate 24 made of a 0.18 mm thick transparent film substrate, the lower substrate 26 made of a 0.18 mm thick transparent film substrate, and the respective electrodes are used. Become. The upper substrate 24 and the lower substrate 26 of the touch panel are overlapped on substantially the same outer periphery.

Further, the flexible printed circuit board mounted on the first substrate 1 constituting the liquid crystal display panel is integrated with the FPC 61 for the touch panel, and branches off in the middle to form the FPC 61 'for the liquid crystal display panel.

Further, since the upper substrate 24 of the touch panel is thin, the protection film 66 prevents damage. The provision of the hard coat layer and the antireflection layer on the viewer side on the protective film 66 is the same as in the other embodiments.

Further, between the touch panel and the liquid crystal display panel, two layers of the mutual adhesive layer 44, the polarizing plate 45 and the retardation plate 46 are provided.
Is provided, the touch panel has elasticity, and the upper substrate 24 is pressed by pressure for input from the upper substrate 24 side of the touch panel.
Even when the lower substrate 26 is in contact with the lower substrate 26 and the lower substrate 26 is slightly bent, the bending of the lower substrate 26 is dispersed and transmitted to the first substrate 1 constituting the liquid crystal display panel, and the first substrate The distortion of No. 1 hardly occurs and hardly propagates to the liquid crystal layer 13, so that image distortion at the time of input to the touch panel can be prevented.

On the other side of the liquid crystal layer 13 of the second substrate 6 constituting the liquid crystal display panel, there is provided a second polarizing plate 77 and a reflecting plate 8 formed by depositing a metal film on a film by vacuum sputtering. . In the case of a transflective liquid crystal display device, the metal film is thinned, and in the case of a reflective liquid crystal display device,
Thicken the metal film.

As is apparent from the above description, the upper substrate 24 and the lower substrate 26 constituting the touch panel are made of a transparent film substrate to improve the operability and not to be easily broken. Furthermore, in order to reduce the difference in the refractive index at the interface between the transparent conductive film and the air layer, the gap between the upper substrate and the lower substrate is filled with a sealing medium 41 made of a liquid. I have. As described above, the transmittance of the touch panel can be improved.

Further, the first substrate 1 and the second substrate 7 constituting the liquid crystal display panel are made of a transparent plastic substrate, and have a structure that is not easily broken. Further, since the first polarizing plate 45 and the retardation plate 46 provided between the touch panel and the liquid crystal display panel are also films, the liquid crystal display panel can be curved. When laminating is performed, each constituent member can be curved, so that bubbles are not entrapped at the time of lamination, and a thin configuration can be achieved.

In the present embodiment, a polarizing plate and a retardation plate are used. However, the polarizing plate and the retardation plate are sandwiched between a liquid crystal display panel and a touch panel, and a plastic substrate used for the liquid crystal display panel includes a gas barrier layer, A moisture barrier layer is provided, and the liquid crystal layer can block moisture. Since the touch panel can also block moisture by the encapsulating medium, a polarizing layer or a retardation layer alone, which is obtained by removing a protective film from a polarizing plate or a retardation plate, is used. Alternatively, it is possible to use a polarizing plate instead of the lower substrate 26 of the touch panel to make the structure thinner.

In the present embodiment, a polarizing plate and a retardation plate are provided between the touch panel and the liquid crystal display panel to improve the reliability of the polarizing plate and the retardation plate, increase the input sensitivity of the touch panel, and increase the The upper substrate 24 and the lower substrate 26 constituting the touch panel are formed of an optically isotropic film, and the phase difference plate and the polarizing plate are arranged from the upper substrate 24 side of the touch panel. , The relief of the damage of the upper substrate 24 and the improvement of the appearance of the touch panel can be performed.

<Fifth Embodiment> [Structure of liquid crystal display device in this embodiment: FIG. 12] A liquid crystal display device with an input device in this embodiment of the present invention will be described below with reference to the drawings. The feature of the present embodiment is that an active matrix type which enables driving of a liquid crystal layer via a thin film transistor (TFT) element as a switching element in a liquid crystal display panel is adopted. The first electrode provided on the first substrate of the liquid crystal display panel is a solid electrode provided on almost the entire surface. The outline of the substrate is such that the outline of the lower substrate constituting the touch panel is substantially equal to the outline of the first substrate of the liquid crystal display panel, and the second substrate of the liquid crystal display panel is outside the outline of the first substrate. is there. FIG. 12 is a cross-sectional view taken along line AA of FIG. 1 in the liquid crystal display device of the present invention. Hereinafter, this embodiment will be described with reference to FIG. In addition, about the structure similar to 1st Embodiment, it demonstrates using the same code | symbol.

The configuration of the liquid crystal display panel in this embodiment is such that the second substrate 6 made of a 0.7 mm glass plate is
Gate electrode 105 and gate electrode 10 made of tantalum film
5 and gate insulating film 106 provided on
And amorphous silicon (a) provided on the second substrate 6
-A semiconductor layer 107 made of a Si) film is provided. On the semiconductor layer 107 and the second substrate 6, there are provided a source electrode 108 and a drain electrode 109 made of a chromium film. The gate electrode 105 is an electrode in the X-axis direction of the liquid crystal display panel, and the source electrode 108 is an electrode in the Y-axis direction. Also,
On the thin film transistor (TFT) and the second substrate 6, the surface has an uneven shape, and an uneven surface insulating film 115 having an interlayer insulating film hole 110 is provided on the drain electrode 109.

The uneven surface insulating film 115 is made of a photosensitive acrylic resin, and is used to irradiate the convex portions with light to improve the solubility in a photolithography process and a developing process, and to smooth the convex portions and the concave portions. A heat treatment is performed to form surface irregularities. Before forming the unevenness, the interlayer insulating film hole 110 is to remove the film on the drain electrode 109 by dissolving all the photosensitive acrylic resin by irradiating ultraviolet rays stronger than the amount of ultraviolet light for forming the unevenness and a long developing time. Is formed.

The drain electrode 109 is formed on the uneven surface insulating film 1.
15, a reflective electrode 116 is provided, which is electrically connected through the interlayer insulating film hole 110 provided on the concave / convex surface insulating film 115. A semiconductor layer containing impurities provided between the semiconductor layer 107 and the source electrode 108 or the drain electrode 109 or a passivation film provided over a thin film transistor (TFT) is omitted in the drawing.

In the liquid crystal layer 15, the liquid crystal molecules on the first substrate 1 side are shifted from the 3 o'clock direction by 112.5 degrees in the 6 o'clock direction, and the liquid crystal molecules on the second substrate 6 side are in the 3 o'clock direction. Twisted nematic (TN) liquid crystal that twists 45 degrees in the counterclockwise direction from the first substrate 1 side to the second substrate 6 side by 67.5 degrees in the direction of 6 o'clock. By using twisted nematic (TN) liquid crystal, the twist angle is smaller than that of super twisted nematic (STN) liquid crystal, and the phase difference value change can be increased. It is possible to reduce the change in display due to the distortion of the liquid crystal display panel.

A mutual adhesive layer 44 made of acrylic resin is provided between the first substrate 1 of the liquid crystal display panel and the touch panel.
To adhere. It does not have scattering properties.

The structure of the touch panel, which is an input device provided on the mutual adhesive layer 44, is the same as the structure shown in the first embodiment, and the description is omitted.

Between the lower substrate 26 of the touch panel and the first substrate 1 of the liquid crystal display panel, from the first substrate 1 side, the mutual adhesive layer 44, the phase difference plate 46, the polarizing plate 45 and the mutual adhesive layer 44 Are laminated in this order. The retardation plate 46 is made of a 70 μm-thick transparent film obtained by stretching polycarbonate (PD), and is a quarter-wave plate having a wavelength of 0.55 μm and a retardation value of 0.137 μm. The polarizing plate 45 employs an absorption type polarizing plate in which one polarization axis is a transmission axis and a polarization axis substantially orthogonal to the transmission axis is an absorption axis.

An observer-side surface of the upper substrate 24 of the touch panel is subjected to an antireflection treatment, a stain prevention treatment, and a hard coat treatment, thereby improving the structure of the display quality of the liquid crystal display device and the durability of the touch panel. be able to.

[0101]

According to the liquid crystal display device of the present invention, the connection portion between the touch panel and the drive circuit is arranged on the same side as the connection portion between the liquid crystal display panel and the drive circuit, and the region required for connection is shared. In particular, chip-on-glass (COG) mounting,
In the case of the COF mounting method, the mounting area of the integrated circuit is used as the mounting area with the driving circuit of the touch panel.
The effective display area of the liquid crystal display device can be increased.

Further, the X electrode of the touch panel or the Y electrode
The number of the X wiring electrodes and the number of the Y wiring electrodes up to the input device connection portion for connecting the electrodes and the driving circuit are four, and at least two of them are the liquid crystal display panel connection for connecting to the driving circuit of the liquid crystal display panel. By providing a region overlapping with the portion or a region overlapping with the mounting portion on which the integrated circuit (IC) is provided, a region used for routing the wiring electrodes can be sufficiently provided on the outer periphery of the display region. That is, a gap between the X electrode, the Y electrode, and the wiring electrode of the touch panel, or a gap sufficient to prevent an electrical short circuit between the X electrode and the Y electrode, or between the X wiring electrode and the Y wiring electrode, is planarized. Accordingly, it is possible to prevent the thickness unevenness of the upper substrate and the lower substrate of the input device due to the thickness of the electrode, thereby preventing image distortion.

Further, by integrating the flexible printed circuit board for connecting the liquid crystal display panel and the drive circuit with the flexible printed circuit board for connecting the input device and the drive circuit, the connection area and the area of the flexible printed circuit board can be reduced. Becomes possible. Furthermore, the flexible printed circuit board can be inserted between the upper board and the lower board of the input device, and furthermore, the periphery of the mounting portion of the flexible printed board can be sealed with a silicone resin to protect the terminals made of silver electrodes. It becomes possible.

Further, the connection between the input device and the drive circuit is established through the side wall of the first substrate of the liquid crystal display panel. By using the lower substrate and the side wall of the first substrate, strength is reinforced and reliability can be improved.

Also, by using a polarizing plate as the protective film provided on the upper substrate of the input device, compared with the conventional case where a polarizing plate is provided between the input device and the liquid crystal display panel, the input device is formed on the upper substrate. By adhering the polarizing plate to the thin scratches and dirt with an adhesive layer, the visibility can be reduced. Further, since the light incident on the input device can be reduced by half by the polarizing plate, the visibility of dust and the like in the touch panel can be reduced.

Further, when a conventional polarizing plate is provided on the input surface of the input device, the input sensitivity is reduced because the polarizing plate has protective layers above and below the polarizing layer. for that reason,
In the present invention, only the polarizing layer is provided on the input surface of the input device. Further, on the input surface of the polarizing plate, a configuration is employed in which a hard coat layer for preventing damage to the film or an antireflection layer is directly formed.

Further, by providing a polarizing plate or a polarizing plate and a retardation plate between the lower substrate of the input device and the first substrate of the liquid crystal display panel, the liquid crystal display panel and the input device are integrated. And the strength can be improved. Further, by using only the polarizing layer as the polarizing plate and using only the retardation layer and the adhesive layer as the retardation plate, a thin and reliable configuration can be obtained. In particular,
By bonding the lower substrate of the touch panel and the first substrate of the liquid crystal display panel to a glass substrate, and further bonding the lower substrate, the first substrate, and a polarizing layer and a retardation layer provided therebetween with an adhesive material, Since there is no water permeability, and the water permeability does not increase even at a high temperature, for example, about 100 ° C., the humidity resistance of the polarizing layer or the retardation layer can be improved.

Further, the polarizing layer or the retardation layer provided between the lower substrate and the first substrate is smaller than the outer shapes of the lower substrate and the first substrate and further enters inside from the outer peripheral portion. That is, when the polarizing layer or the retardation layer protrudes from the outer shape of the lower substrate or the first substrate, the polarizing layer,
Alternatively, because the retardation layer is directly deteriorated by moisture, the reliability cannot be improved.

Further, a diffusion layer is formed between the protective film and the upper substrate of the input device, between the polarizing plate or the phase difference plate and the upper substrate, or between the lower substrate and the first substrate of the liquid crystal display panel. By providing, the unnecessary of the liquid crystal display panel,
Glaring reflection can be prevented. In the present invention, the diffusion layer uses a diffusion paste containing a transparent spacer having a different refractive index for the adhesive, and in the present invention, the members that enter and exit through the diffusion paste are bonded to each other. By using diffusion glue for
Display quality can be improved.

Further, the lower substrate constituting the input device and the first substrate constituting the liquid crystal display panel are bonded directly via an adhesive or via a polarizing plate or the like, so that the first substrate is integrated. The structure having a transparent conductive film on almost the entire surface of the substrate is simple and preferable. It is preferable to use an active matrix type in which a switching element is provided for each pixel electrode as a structure which can display by arranging a plurality of pixel electrodes on a matrix.

In the embodiment of the present invention, although an alignment film for aligning the liquid crystal layer in a predetermined direction is not shown, it naturally has an alignment film. In addition, although a case where a liquid crystal display panel having a color filter is used and a case where a color filter is desired to be used are shown, the best case is illustrated, and a configuration in which the color filter is removed from the embodiment using the color filter is shown. The effect can be almost achieved. Conversely, even if a color filter is used in an embodiment that does not use a color filter, the effect can be almost achieved.

The liquid crystal display device of the present invention has been described with respect to an example in which the auxiliary light source is provided on the surface of the liquid crystal display panel opposite to the viewer side and is used as a transflective type. The effect of the present invention is of course also effective in the case where a light source is provided and a light source used in reflective display in which light is introduced from the first substrate side of the liquid crystal display panel by a light guide plate is used in the liquid crystal display device.

[Brief description of the drawings]

FIG. 1 is a schematic three-dimensional view of a liquid crystal display device of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display device of the present invention.

FIG. 3 is a sectional view showing a part of the liquid crystal display device of the present invention.

FIG. 4 is a schematic three-dimensional view showing the structure of the touch panel of the present invention.

FIG. 5 is a sectional view showing a part of the touch panel of the present invention.

FIG. 6 is a plan view showing a liquid crystal display panel and a touch panel of the present invention.

FIG. 7 is a sectional view showing a liquid crystal display panel and a touch panel according to the present invention.

FIG. 8 is a sectional view showing a liquid crystal display panel and a touch panel according to the present invention.

FIG. 9 is a plan view showing a liquid crystal display panel and a touch panel of the present invention.

FIG. 10 is a sectional view showing a liquid crystal display panel and a touch panel of the present invention.

FIG. 11 is a sectional view showing a liquid crystal display panel and a touch panel of the present invention.

FIG. 12 is a sectional view showing a liquid crystal display panel and a touch panel according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 1st electrode 6 2nd board | substrate 7 2nd electrode 8 Reflector 9 Red color filter 10 Green color filter 11 Blue color filter 15 Liquid crystal layer 16 Sealing material 21 Upper substrate 22 Upper electrode 26 Lower substrate 27 Lower electrode 40 Sealing material for touch panel 41 Encapsulating medium 44 Mutual adhesion layer 45 Polarizer (first polarizer) 46 Retardation plate 47 Adhesive layer 48 Transparent spacer 49 Third retarder 65 Second retarder 66 Protective film

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G02F 1/1345 G02F 1/1345 G09F 9/00 313 G09F 9/00 313 348 348L 348C 366 366Z F term (reference) 2H089 HA18 JA08 QA11 TA03 TA14 TA15 2H091 FA08X FA11X FA32X FB02 FD06 FD15 GA11 LA11 LA18 2H092 GA44 GA50 GA51 GA62 PA10 PA11 PA12 5G435 AA01 AA07 AA09 AA11 AA13 AA14 AA18 BB12 BB15 BB16 EE16 EE16 EE16 EE16 EE16 EE32 EE32 EE10 GG12 GG43 HH12 HH14 KK02

Claims (20)

[Claims] 1. A liquid crystal display panel comprising a liquid crystal layer sealed between a first electrode provided on a transparent first substrate and a second electrode provided on a second substrate. An input device in which an upper substrate having an upper electrode and a lower substrate having a lower electrode are bonded on the observer side of the substrate, and a driving circuit is provided on one side of the first substrate in the liquid crystal display panel. And a liquid crystal display panel connecting portion for connecting to a driving circuit on one side of the lower substrate of the input device. A liquid crystal display device, wherein one side of the first substrate and one side of the lower substrate having the input device connection portion are arranged so as to substantially overlap each other. 2. A liquid crystal display panel comprising a liquid crystal layer sealed between a first electrode provided on a transparent first substrate and a second electrode provided on a second substrate. An input device in which an upper substrate having an upper electrode and a lower substrate having a lower electrode are bonded on the observer side of the substrate, and a driving circuit is provided on one side of the first substrate in the liquid crystal display panel. A liquid crystal display panel connecting portion for connecting to the input device, on one side of the lower substrate of the input device, an input device connecting portion for connecting to a driving circuit, and the liquid crystal display panel connecting portion. A liquid crystal display panel connection means for connecting to a drive circuit,
Or an input device connecting means for connecting an input device connecting portion and a drive circuit, wherein the display panel connecting means or the input device connecting means is a side wall portion of a lower substrate of the input device or a first portion of a liquid crystal display panel. A liquid crystal display device provided along a side wall of a substrate. 3. A liquid crystal display panel connection means for connecting the liquid crystal display panel connection part and a drive circuit, or an input device connection means for connecting an input device connection part and a drive circuit,
2. The liquid crystal display panel connection means or the input device connection means is provided along a side wall of a lower substrate of the input device or a side wall of a first substrate of the liquid crystal display panel. 3. The liquid crystal display device according to 1. 4. The liquid crystal display panel connection means and the input device connection means, wherein both the liquid crystal display panel connection means and the input device connection means are integrated. The liquid crystal display device according to claim 2 or 3. 5. The liquid crystal display device according to claim 2, wherein the input device connection means or the liquid crystal display panel connection means is a flexible substrate. 6. A mounting area for directly mounting an integrated circuit for converting a signal of the driving circuit into a display signal of the liquid crystal display panel is provided on one side of the first substrate constituting the liquid crystal display panel. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is provided. 7. The liquid crystal display device according to claim 6, wherein one side of the first substrate including the mounting area has the liquid crystal display panel connection portion. 8. The input device has at least four electrodes including a pair of X electrodes and a pair of Y electrodes for performing position detection on an upper substrate or a lower substrate, wherein the at least four electrodes are Wiring to the input device connection portion by an X wiring electrode and a Y wiring electrode, and at least three of the X wiring electrode and the Y wiring electrode are in an area overlapping with the liquid crystal display panel connection portion when viewed from the observer side. 2. The method according to claim 1, wherein
Or the liquid crystal display device according to claim 2. 9. The liquid crystal display device according to claim 2, wherein the input device connecting means has a portion inserted between an upper substrate and a lower substrate constituting the input device. . 10. The outer shape of said lower substrate forming said input device and the outer shape of said first substrate forming said liquid crystal display panel are the same, or the outer shape of said lower substrate is slightly smaller, 2. The substrate according to claim 1, wherein the substrate and the first substrate are arranged at positions overlapping each other.
Or the liquid crystal display device according to claim 2. 11. The liquid crystal display device according to claim 1, further comprising a mutual adhesive layer between the lower substrate and the first substrate. 12. A polarizing plate or at least one plate from the upper substrate side is provided on the viewer side of the upper substrate constituting the input device.
3. The liquid crystal display device according to claim 1, further comprising: a retardation plate and a polarizing plate. 13. The liquid crystal display device according to claim 12, wherein the retardation plate is made of a liquid crystal polymer. 14. A polarizing layer excluding a protective layer is provided on a viewer side of an upper substrate constituting the input device, and an adhesive layer, a polarizing layer, an adhesive layer, and a protective film are provided from the upper substrate side of the input device. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is configured to be stacked in the order of: 15. An input device comprising, on an observer side of an upper substrate constituting the input device, a retardation plate excluding at least one protective layer from the upper substrate side and a polarizing plate excluding the protective layer. 3. The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a configuration in which an adhesive layer, a retardation plate, an adhesive layer, a polarizing plate, an adhesive layer, and a protective film are laminated in this order from the upper substrate side of the device. . 16. A polarizing plate is provided between a first substrate constituting the liquid crystal display panel and a lower substrate constituting an input device, and the polarizing plate further comprises a first substrate and a lower substrate. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is bonded to substrates on both sides of the liquid crystal display device. 17. The liquid crystal display device according to claim 16, wherein the first substrate, the lower substrate, and the polarizing plate have substantially the same outer shape and overlap on substantially the same side. 18. A polarizing plate and a phase difference plate are provided between a first substrate forming the liquid crystal display panel and a lower substrate forming an input device, and further comprising the polarizing plate or the phase difference plate. 3. The liquid crystal display device according to claim 1, wherein the first and second substrates are bonded to substrates on both sides of the first substrate and the lower substrate. 19. The liquid crystal display device according to claim 1, further comprising a scattering layer on a viewer side of the upper substrate or on a viewer side of the first substrate. 20. The second electrode is a pixel electrode connected to a switching element, and the first electrode is substantially the first electrode.
The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a transparent conductive film formed on the entire surface of the substrate.