JP2001343908A - Touch type el display device and method for detecting input - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a touch panel EL display device excellent in display quality with little glittering or decrease in the contrast due to reflection of external light. SOLUTION: The touch type EL display device (10) has a touch panel (2) which detects the input position by allowing electrodes (22, 23) disposed facing each other through a gap to be partially in contact with each other by pressing force and which is tightly adhered to the back side of an EL display panel (1) having flexibility. The display light by the EL display panel can be observed without being influenced by the touch panel, and signals can be inputted to the touch panel by bending the flexible EL display panel by pressing force. Since it is not required to make the touch panel as a see-through type, an opaque electrode excellent in formation efficiency, stability or the like can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input position detection type touch type EL display device which suppresses visual obstruction based on light reflected by a touch panel and has excellent display quality.

[0002]

BACKGROUND OF THE INVENTION Transparent electrodes 12 and 15 as illustrated in FIG.
Various EL display devices 30 using an EL display panel 1 in which a light emitting layer 14 made of an EL (electroluminescence) material is disposed between the transparent film 21 and a transparent substrate 24 on the viewing side of the panel have been proposed. There is also proposed a touch-type EL display device in which a touch panel 2 in which transparent electrodes 22 and 23 provided on a touch panel 2 are arranged to face each other with a gap formed by a gap adjusting material 25 therebetween. In such a device, the input position is detected by the partial contact of the opposed arrangement electrode through the pressing of the touch panel, and therefore, it is essential to provide a gap between the opposed electrodes.

However, as shown in the example of FIG. 3, the reflection α3 ′ of the external light α3 due to the interface between the transparent electrodes 12 and 15 of the touch panel and the air gap is strong, and visibility is greatly impaired due to glare and a decrease in the contrast of the display light β3 of the EL display panel 1. There is a problem that display quality is deteriorated. By the way, indium
In the case of a transparent electrode made of tin oxide (ITO), the difference in the refractive index from the gap becomes about 1.0 or more, and interface reflection is generated which is larger than surface reflection by the EL display panel. In addition, the interface reflection of the external light based on the increase of the light increases, and strong glare occurs, and the contrast of the display light by the EL display panel is largely reduced. For this reason, it has been proposed to provide an anti-reflection film on the touch panel or to provide a low-refractive index layer for suppressing interfacial reflection. Not at present.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to develop an EL display device equipped with a touch panel which is excellent in display quality with little glare or contrast deterioration due to reflection of external light.

[0005]

An object of the present invention is to provide a flexible touch panel which detects an input position by partially contacting electrodes opposed to each other with a gap through a pressing force.
An object of the present invention is to provide a touch-type EL display device which is provided in close contact with a rear surface of a display panel.

[0006]

According to the present invention, since the EL display panel is positioned on the viewing side of the touch panel, the display light from the EL display panel can be viewed without being affected by the touch panel, and the EL display panel can be used. It has flexibility and can be bent by the pressing force and input to the touch panel. Therefore, it is possible to avoid the occurrence of glare and a decrease in contrast due to reflection of external light or the like by the conventional touch panel disposed on the viewing side, and to obtain an EL display device with a touch panel having excellent display quality. Further, since there is no need to see through the touch panel, it is not necessary to form the transparent panel, and an opaque electrode having excellent formation efficiency and stability can be used.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The touch-type EL display device according to the present invention is a touch-type EL display device having a flexible touch panel for detecting an input position by partially contacting electrodes opposed to each other via a gap with a pressing force. And a device closely attached to the back side of the EL display panel. Examples thereof are shown in FIGS.
10 is a touch-type EL display device, 1 is an EL display panel, and 2 is a touch panel.

The EL display panel is not particularly limited, and has a mode in which a light emitting layer made of an EL material is arranged between a positive electrode and a negative electrode using a transparent electrode on the viewing side, and has a flexibility. What is necessary is just to be able to bend through a pressing force. Therefore, any known flexible material can be used. Incidentally, in the illustrated example, a hole transport layer (TPD) 13 and a light emitting layer 14 are provided between the transparent electrode 12 provided on the transparent substrate 11 and the rear electrode 15.
Is provided.

Therefore, for example, an electron transporting layer such as phenylbiphenyloxadiazole is provided between the light emitting layer and the cathode.
L display panel (C. Adachi, S. Tokito, T. Tsutsui, S. Saito,
Jpn. J. Appl. Phy., Vol. 27, L269 (1988)), and an EL display panel that enables color display by forming white light by three-color emission of RGB using a blue light emitting element or the like. (Japanese Unexamined Patent Application Publication No. 7-90260), an EL display panel (P. Dyrekl) in which an electroluminescent layer is subjected to a unidirectional orientation treatment to obtain polarized light.
evet al, Adv. Mater, 8, 146 (1995), JH Wendorff et al,
Liquid Crystal, Vol. 21, No. 6, 903 (1996)), an EL display panel in which a luminescent color is changed by mixing a fluorescent conversion material, a dye, a pigment, or the like with the constituent material can be used.

An EL display panel that can be preferably used is EL
An organic EL is used as a material. Organic EL materials
It emits light by application of a lower voltage than inorganic materials, and has advantages such as excellent flexibility in material design and easy thinning.

As described above, of the negative and positive electrodes sandwiching the light emitting layer in the EL display panel, the electrode on the viewing side is formed of a transparent electrode so as to allow display light to be seen through. The electrode on the back side is not limited to the transparent electrode, but is optional, and may be formed of an opaque electrode.

For forming the transparent electrode and the opaque electrode, an appropriate conductive material according to the related art can be used, and there is no particular limitation. By the way, examples include indium oxide, tin oxide, titanium oxide, cadmium oxide, metal oxides composed of mixtures thereof, gold and silver, platinum and palladium, copper and aluminum, nickel and chromium, titanium and iron, cobalt and tin. And a metal such as magnesium, an alloy of such a metal such as a silver-magnesium alloy, and a conductive material formed of another metal compound such as copper iodide.

The method of forming the electrodes can be in accordance with the prior art and is not particularly limited. By the way, as an example, a conductive material is deposited on a substrate by an appropriate thin film forming method such as a vacuum evaporation method, a sputtering method, an ion plating method, a spray pyrolysis method, a chemical plating method, an electroplating method, or a combination thereof. Or a method of attaching to a predetermined surface such as a support using a support made of a film or the like,
A method of applying a conductive paint on the predetermined surface may be used. Electrodes consisting of a coating layer of a resin containing conductive powder such as carbon have higher production efficiency than transparent electrodes, and when high elasticity is given conductivity, it can be easily input as a substrate that also serves as an electrode. It can be preferably used from the viewpoints of properties (deformability) and durability.

As described above, both the positive and negative electrodes can be used in a form provided on a support made of a substrate or a film, if necessary. In this case, the transparent substrate 11 is used to support the transparent electrode on the viewing side, as shown in the example of FIG.
It is preferable to form the substrate with a flexible transparent film rather than flexibility. When the back-side electrode is supported by the support, it is not limited to a transparent body as in the case of the back-side electrode described above, but may be any opaque body. It is preferable that only one of the positive and negative electrodes is supported by a film or the like from the viewpoint of the pressing input property (deformability) due to the flexibility of the EL display panel, and the transparent electrode 12 is formed as shown in the figure from the viewpoint of durability. The form supported by the transparent film 11 is preferable.

A glass plate may be used for the substrate or the film, particularly for the transparent support, but a resin plate is preferably used from the viewpoint of flexibility and difficulty in breaking. An appropriate resin such as a thermoplastic resin or a curable resin can be used as the resin. Incidentally, examples include polycarbonate and polyarylate, polyether sulfone and polyester, polysulfone and cellulose acetate polymers, polymethyl methacrylate and polyether imide, polyamide and polyvinyl chloride, polystyrene and polyether ether ketone, polyolefin and polyvinyl chloride, Epoxy resins, unsaturated polyesters, polydiallyl phthalate, polyisobonyl methacrylate and the like can be mentioned. The colored resin substrate can be formed by an appropriate method such as a method in which a resin contains an appropriate colorant such as a pigment or a dye.

The thickness of the support made of a substrate or a film can be appropriately determined according to the flexibility and the like. Generally 10 μm to 1 mm, especially 20 to 800 μm, especially 50 to 50
The thickness is 0 μm. When a support is used to support the back electrode, the support has a large number of small protrusions on the back side of the support for the purpose of efficiently transmitting the deflection caused by pressing on the viewing side of the EL display panel to the touch panel. May be used.

An EL display panel, particularly, on its viewing side, is provided with one or more kinds of appropriate optical components as necessary as shown in FIGS. 1 and 2 for an appropriate purpose such as improvement of visibility of display light. It can be arranged at an appropriate position. Incidentally, in the example of FIG. 1, a polarizing plate 31 is disposed on the viewing side of the EL display panel via a quarter-wave plate 32, and in the example of FIG.
A half-wave plate 33 is further added between the wave plate 32 and the polarizing plate 31. The arrangement of the quarter-wave plate, the polarizing plate, and the like aims at improving the visibility of display light by the EL display panel.

That is, in the EL display panel, as described above, the back side electrode is sometimes formed of a light reflecting layer made of a metal thin film or the like. In that case, as illustrated in FIGS.
Outside light α1 is reflected not only by the interface reflection by the transparent electrode 12 such as TO but also by the reflection action by the back electrode 15 thereof,
In some cases, the reflected light α1 ′ impairs the visibility of display light by the EL display panel. In particular, since the metal thin film has a high reflectance, even when the EL display panel is not emitting light, the reflected light α1 ′.
And makes it difficult to form a good black display during light emission.

For this reason, in the example shown in FIG. 1, a polarizing plate is provided on the viewing side of the EL display panel via a quarter-wave plate for the purpose of preventing the above-mentioned view inhibition due to reflection of external light. According to this, after the external light α1 incident on the EL display panel is linearly polarized by the polarizing plate, it is circularly polarized by the 板 wavelength plate, and is incident on the transparent electrode or the back electrode and reflected. At the time of the reflection, the incident circularly polarized light is reflected and inverted to have the opposite phase, which is re-incident on the quarter-wave plate and is linearly polarized. It is linearly polarized light in the direction of absorption and cannot pass through the polarizing plate. In this case, from the viewpoint of preventing transmission of the reflected light, it is advantageous to arrange the optical axis of the polarizing plate and the slow axis of the quarter-wave plate so as to intersect at an angle of 35 to 55 degrees.

As a result, the only light obstructing the display of the EL display panel is the surface reflection light from the polarizing plate, and good display light such as black display by the EL display panel can be achieved. Also, the reflected light of about the surface reflected light by the polarizing plate,
Since the conventional measures such as an anti-glare layer and an anti-reflection layer can sufficiently cope with the problem, it is possible to obtain display light with more excellent visibility by taking such measures.

On the other hand, the addition of the above-mentioned half-wave plate according to the example of FIG. 2 makes the effect of preventing the reflected light from being transmitted by the above-mentioned polarizing plate appear in a wide wavelength range, particularly a wide visible light range. Thus, the object is to further improve the visibility of the display light.
In other words, the effect of phase inversion by a quarter-wave plate is higher as the degree of circular polarization is higher. However, with a quarter-wave plate alone, wavelength dispersion that can be approximated by Cauchy's dispersion equation occurs to the phase difference, and the entire wavelength range is increased. Does not produce good circularly polarized light, and 1/4 wavelength plate
By combining a half-wave plate, good circularly polarized light can be obtained in most of the visible light region (Japanese Patent Laid-Open No. 5-100114), and as a result, the visibility of display light can be further improved.

In the above, the half-wave plate is disposed so that its slow axis is at an angle different from the slow axis of the quarter-wave plate, or exhibits a wavelength dispersion characteristic different from that of the quarter-wave plate. The wavelength region of phase inversion can be stably expanded by a method of combining them or a method of using them in combination. In this case, in an arrangement with different angles, the optical axis of the polarizing plate and the optical axis of the half-wave plate intersect at an angle of 5 to 25 degrees, and the intersection angle is θ.
And the optical axis of the 1/4 wavelength plate is 2θ + 35 to 2θ + 5
It is more preferable to have a range relationship of crossing at an angle of 5 degrees from the viewpoint of expanding the wavelength range of phase inversion.

As the above-mentioned polarizing plate, quarter-wave plate, and half-wave plate, appropriate ones can be used, and there is no particular limitation. By the way, examples of the polarizing plate include dichromatic dyes such as iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol film, partially formalized polyvinyl alcohol film, and ethylene / vinyl acetate copolymer partially saponified film. Polarized films such as a film stretched by adsorbing a hydrophilic substance and a polyene oriented film such as a dehydrated product of polyvinyl alcohol and a dehydrochlorinated product of polyvinyl chloride.

Further, there is a polarizing plate having a transparent protective layer comprising a resin coating layer or a film laminating layer on one or both sides of the polarizing film for the purpose of protecting water resistance or the like. Further, the transparent protective layer has an average particle size of 0.5 to 0.5, for example.
20 μm silica or alumina, titania or zirconia,
Fine irregularities on the surface by containing transparent fine particles such as inorganic fine particles that may be conductive, such as tin oxide, indium oxide, cadmium oxide, and antimony oxide, and organic fine particles such as a crosslinked or uncrosslinked polymer. Can also be given.
Further, a polarizing plate having a polarizing layer composed of a liquid crystal polymer or a liquid crystal-containing polymer may be used. A polarizing plate having a high transmittance is preferably used from the viewpoint of a bright display or the like.

On the other hand, examples of the quarter-wave plate and half-wave plate also include a stretched film made of the resin exemplified above as the support, a material having an alignment layer of a liquid crystal polymer, and a material made of an inorganic crystal. The stretched film may be stretched by various methods such as uniaxial stretching at a free end or a fixed end, biaxial stretching, and stretching in the thickness direction (Japanese Patent No. 2818983).

In forming the EL display panel, other appropriate optical components can be arranged. Polarizer and 1 /
The optical components such as the four-wavelength plate may be simply stacked, but are preferably bonded through a transparent adhesive layer or the like for the purpose of preventing the optical axis from shifting or dust from entering.
An appropriate adhesive such as a pressure-sensitive adhesive can be used for the bonding treatment. In this case, it is necessary to set the refractive index difference between the adhesive layer and the adherend as small as possible to prevent interfacial reflection and the like. Is more preferable.

Further, the light emitting layer forming the EL display panel includes:
In general, the light-emitting layer is preferably protected by a moisture-proof layer because the light-emitting layer is easily deteriorated by humidity. The moisture-proof layer can be provided separately, or can also be used as another functional layer. Incidentally, in the illustrated example, the transparent substrate 11 can also serve as a moisture-proof layer on the viewing side, and the transparent electrode 12 made of ITO has excellent moisture resistance and can also serve as a moisture-proof layer on the viewing side.

The back electrode can also serve as a moisture-proof layer on the back side, depending on the amount of the forming material, and the touch panel and its forming member can also serve as the moisture-proof layer on the back side. Such a method in which a moisture-proof layer is also used as another functional layer can be made thinner by omitting the formation layer, and is more advantageous than the point of improving the flexibility of the EL display panel. It is preferable that the side end surface of the light-emitting layer be subjected to a moisture-proof treatment by a method of providing a water-resistant coat layer made of, for example, an epoxy resin.

The touch panel arranged on the back side of the flexible EL display panel can also be formed in a structure similar to the conventional one except that the touch panel is closely attached without any intervening gap. An appropriate structure capable of detecting the input position by partially contacting with each other via the pressing force can be adopted. Incidentally, in the example of FIGS. 1 and 2, the touch panel 2 in which the electrode 22 provided on the film 21 and the electrode 23 provided on the substrate 24 are arranged to face each other via a gap formed by the gap adjusting material 25.
Are adhered to the back side of the EL display panel 1 via an adhesive layer 16.

The input to the touch panel is performed by partially bending the EL display panel 1 through a pressing force of an appropriate means such as a finger or the like, so that the electrodes 2 disposed opposite to each other via the gap of the touch panel 2.
This can be achieved by realizing 2, 23 partial contact. The input position can be detected by a conventional detection method such as a resistance change method or a switching method.

In the above case, by arranging the EL display panel and the touch panel in close contact with each other without any air gap, the deflection of the EL display panel is efficiently transmitted to the touch panel, particularly the electrode on the EL display panel side, thereby preventing input errors. can do. Therefore, it is preferable that the electrode on the EL display panel side of the touch panel or the supporting mechanism thereof has excellent flexibility and is easily deformable from the viewpoint of smooth input characteristics and the like. Such an easily deformable electrode or its supporting mechanism can be formed by an appropriate method.

As a preferred method of the easily deformable electrode or its supporting mechanism, an electrode 22 is provided on one side of the film 21 as shown in the above-mentioned example so that the electrode is on the outside, that is, through the side having no electrode. A method of bonding to the back side (15) of the EL display panel 1 with the adhesive layer 16 or the like can be used. In this case, the electrode 22 for the touch panel is directly formed on the back surface of a support such as a film that supports the back electrode 15 of the EL display panel 1, and the back electrode of the EL display panel is formed on one support. A system that also serves as one of the electrodes of the touch panel can be employed.
Further, a method in which the back electrode of the EL display panel and one electrode of the touch panel are integrally formed by using a metal foil or a metal sheet for the support may be employed.

The back electrode 23 of the touch panel
May be directly attached to an appropriate substrate such as glass or resin according to the electrodes of the EL display panel, for example.
The electrode may be provided on the film, and the film may be provided as the film, or the film may be attached to the substrate. The film may be provided by an appropriate method, and there is no particular limitation. The structure supported by a substrate having an excellent elastic modulus is preferable to the point of energization due to smooth contact between the electrodes via the pressing force.

The counter electrode provided in the touch panel may be a transparent electrode or an opaque electrode in any case, and may be formed as an opaque touch panel including its support mechanism. Therefore, an appropriate material such as a film or substrate made of a transparent or opaque material can be used as the support. The above-mentioned EL is used for the transparent electrode, opaque electrode, and support in the touch panel.
It is possible to conform to those exemplified in the display panel.

In the above, when the electrodes are provided,
The surface of the support may be subjected to an appropriate pretreatment such as a corona treatment, an ultraviolet treatment, a plasma treatment, a sputter etching treatment, or an undercoat treatment to enhance the adhesion of the electrode layer. For the undercoat treatment, an appropriate resin such as an acrylic resin, a urethane acrylic resin, an epoxy resin, or a hydrolysis / polycondensate of a metal alkoxide may be used, and a filler such as silica particles or alumina particles may be used therein. Can also be contained.

In the touch-type EL display device according to the present invention, a touch panel having electrodes arranged opposite to each other with a gap as described above is provided on the back side of a flexible EL display panel, and the pressing force of the EL display panel is reduced. The touched position is detected by contacting the opposing electrode of the touch panel partly by interposing the touch panel, and the touch panel is arranged on the back side of the flexible EL display panel without any gap. There is no particular limitation except that the touch panel can be input to the touch panel through the pressing deformation of the EL display panel, and a touch-type EL display device can be formed according to the related art.

Therefore, the EL display panel and the touch panel are
It can be formed in an appropriate form, and a lead electrode or the like for connecting an external circuit can also be provided according to the related art. Also, a hard coat layer made of an acrylic, silicone, or epoxy resin can be applied to the touch surface or the like of the EL display panel as needed, and the surface of the hard coat layer is made to be an anti-glare surface having a fine uneven structure. You can also.

[0038]

EXAMPLE 1 A thickness obtained by injecting an alicyclic epoxy resin into a mold in which two mirror-finished plates are arranged and fixed via a spacer of a predetermined thickness and curing at 120 ° C. for 2 hours. After cutting a 100 μm resin plate into a predetermined size, plasma treatment is performed in an argon atmosphere, and indium tin oxide (ITO) is formed by a sputtering method.
An anode composed of a transparent electrode having a thickness of 100 nm was formed to obtain a transparent resin substrate.

The substrate was washed by an ultrasonic method and then by an ultraviolet ozone method, and N, N′-diphenyl-N, N′-bis was placed on a molybdenum resistance heating boat in a resistance heating type vacuum evaporation apparatus. -(3-methylphenyl)-[1,
1'-biphenyl] -4,4'-diamine (TPD) and Tris (8-
The vacuum chamber is evacuated to 1 × 10 ⁻⁴ Pa via quinolinol) aluminum (Alq), and the TPD is heated to 220 ° C. to form a 60-nm thick TPD film on the ITO film. Alq over 275 ° C
To form an Alq film having a thickness of 60 nm, and further thereon,
The vacuum chamber was evacuated to 2 × 10 ⁻⁴ Pa via magnesium disposed in a molybdenum resistance heating boat and silver disposed in another molybdenum resistance heating boat, and the pressure was reduced to 2 × 10 ⁻⁴ Pa.
Mg / Ag alloy (Mg / Ag:
An EL panel that emits green light (main wavelength: 513 nm) and was formed by forming a cathode film having a thickness of 140 nm and comprising 9/1) was obtained. At the time of the vapor deposition for forming the EL panel, measures were taken to maintain the resin substrate at room temperature. The transparent electrode and the vapor-deposited film were formed so as to be divided into two by etching or masking.

Next, a 波長 wavelength plate (manufactured by Nitto Denko Corporation) is provided on the resin substrate (viewing side) of the EL display panel via an adhesive layer.
R140), and an anti-reflection treatment and an anti-glare treatment on the polarizing plate (NPF HEIGHT, manufactured by Nitto Denko Corporation)
G1425DUAG30GARS) was adhered via an adhesive layer such that the antireflection layer was on the outside, to obtain an EL display panel. Note that the optical axis of the polarizing plate and the quarter-wave plate had a crossing angle of 45 degrees.

Then, a transparent conductive film composed of an ITO film on which a silver paste was printed and a polyester film was prepared by the above-mentioned E.
After bonding to the back side of the L display panel (magnesium silver vapor deposition side) via an adhesive layer so that the ITO film side is outside,
A similar transparent conductive film was adhered to a glass plate via an adhesive layer, and then adhered via a gap adjusting material so that the ITO film was opposed to form a touch panel, thereby obtaining a touch-type EL display device.

Example 2 According to Example 1, an EL display panel was obtained in which a half-wave plate was added between a quarter-wave plate and a polarizing plate. The half-wave plate was arranged so that the optical axis of the half-wave plate had an intersection angle of 15 degrees and the quarter-wave plate had an optical axis of 75 degrees with respect to the optical axis of the polarizing plate.

Comparative Example A transparent conductive film composed of an ITO film on which a silver paste was printed and a polyester film was bonded to a glass plate via an adhesive layer so that the ITO film side was on the outside, and the same transparent conductive film was faced with the ITO film. Thus, a touch panel was formed by bonding with a gap adjusting material interposed therebetween, and the touch panel was arranged on the viewing side of the EL display panel according to Example 1 to obtain a touch-type EL display device.

Evaluation Test 1 The touch-type EL display device obtained in each of Examples 1 and 2 and Comparative Example was placed in a dark room at a position 1 m above the device and at a position inclined 20 degrees with respect to the front direction. Place it for external lighting,
A voltage was applied to one of the two divided electrodes to display a green portion and a non-lighted portion by lighting, and the display state was observed and evaluated. As a result, in Examples 1 and 2, the touch panel was hidden and was not visually recognized, and the display state was the same as that of a normal EL display panel alone. Only the light reflected by the antireflection film was visually recognized, and the display quality was good. On the other hand, in the comparative example, the reflection of the fluorescent lamp on the touch panel arranged on the viewing side was large, particularly remarkable in the vicinity of specular reflection, and the reflected light significantly inhibited black display, making the display very difficult to see. . Also, even if the viewpoint was moved away from the specular reflection direction, the face of the observer was reflected, and it was very difficult to see. In the comparative example, when the touch panel on the viewing side was removed, very clear display was observed as in the above-described example, and the display state was good.

Evaluation Test 2 The switching action was examined by pressing the viewing-side surface of the touch-type EL display devices obtained in Examples 1 and 2 and Comparative Example with a finger. As a result, a satisfactory switch action was detected in Examples 1 and 2 and Comparative Example. In the second embodiment, the addition of the half-wave plate makes the stiffness to the pressing slightly stronger than that of the first and comparative examples, and it is necessary to press the switch more strongly. However, the switching action is good. Did not occur.

As described above, according to the present invention, the touch panel is closely mounted on the back side of the flexible EL display panel, so that reliable input detection is achieved, and surface reflection by the touch panel is prevented to prevent external light. It can also be seen that a touch-type EL display device having good display quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment.

FIG. 2 is a sectional view of another embodiment.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 10: Touch type EL display device 1: EL display panel 11: Transparent film (substrate) 12: Transparent electrode 14: Light emitting layer 15: Back side electrode 16: Adhesive layer 2: Touch panel 21, 24: Substrate (film) 22, 23 :electrode

Continued on the front page (72) Inventor Hideo Sugawara 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation (72) Inventor Minoru Miyatake 1-1-2 Shimohozumi, Ibaraki-shi, Osaka Nittoden (72) Inventor Takehiko Ando 1-2-1 Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation F-term (reference) 5B068 AA21 BB01 BD13 5B087 AA02 CC07 CC14 CC15 CC16 CC17 5C094 AA01 BA27 DA06 DA12 EA10 EB02 EC04 ED14 ED20 FA02 GB10 JA09 JA11 5G006 AA01 FB14 FB17 FB19 FD02 JA01 JB06 JC01 5G435 AA01 BB05 DD12 EE10 EE13 EE49 FF05 GG21 GG25 GG41 HH14 HH18 LL00

Claims (8)

[Claims] 1. A touch panel in which electrodes opposed to each other via a gap are partially brought into contact with each other via a pressing force to detect an input position is closely attached to the back side of a flexible EL display panel. A touch-type EL display device characterized by the above-mentioned. 2. The touch-type EL display device according to claim 1, wherein a film having electrodes on one side is adhered to the back side of the EL display panel with an adhesive layer via the side having no electrodes. 3. The touch-type EL display device according to claim 1, wherein the substrate of the EL display panel is a resin substrate. 4. The touch-type EL display device according to claim 1, further comprising a polarizing plate on the viewing side of the EL display panel via a quarter-wave plate. 5. The method according to claim 4, wherein the optical axis of the polarizing plate is 1/1.
A touch-type EL display device in which the slow axes of a four-wave plate intersect at an angle of 35 to 55 degrees. 6. The touch-type EL display device according to claim 1, further comprising a polarizing plate on a viewing side of the EL display panel via a 波長 wavelength plate and a 波長 wavelength plate. 7. The method according to claim 6, wherein the optical axis of the polarizing plate is 1/1.
When the optical axes of the two-wavelength plate intersect at an angle of 5 to 25 degrees and the intersection angle is θ, the optical axis of the quarter-wavelength plate is 2θ + 35.
A touch-type EL display device that intersects at an angle of up to 2θ + 55 degrees. 8. A touch panel having electrodes opposed to each other with an air gap therebetween being provided on the back side of a flexible EL display panel, and the EL display panel is partially bent via a pressing force to thereby form an electrode for the touch panel. And detecting the pressed position by partially touching the input.