JP2007172891A - Organic electroluminescent display device, and cellular phone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL display device and a cellular phone of which thickness and cost can be reduced. <P>SOLUTION: A screen 11 protects an organic EL module 1, and is a window in order to confirm its display content, and has a UV cut function and a polarizing function. That is, the UV cut function is a function of preventing light of an ultraviolet ray wavelength region out of external light made incident into the screen 11 from being irradiated on the UV module 1. Moreover, the polarization function is a function of blocking reflecting light in the case natural light made incident from the screen 11 is reflected on a cathode 22. Since the light needs to be transmitted, although a resin such as acrylic resin and polycarbonate are generally used as the screen 11, it may be also glass. A surface reinforcing treatment such as a hard coat treatment and a reflection prevention treatment such as an AR coating treatment and an anti-glare treatment may be applied also to the surface of the screen 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an organic EL (Electroluminescence) display device and a mobile phone.

  In recent years, mobile communication terminal devices such as mobile phones have become extremely popular. The functions of mobile phones include not only audio transmission / reception functions but also many functions such as access to the Internet, transmission / reception of still images and moving images taken by e-mail and cameras. As a display device for using these functions, development of a display device using an organic EL element is in progress.

  In an organic EL display device, it is known that an organic thin film is deteriorated by ultraviolet rays. In order to ensure the display capability and durability of the organic EL display device, it is important to avoid the deterioration of the organic thin film.

  An organic EL display device that can avoid deterioration of an organic thin film by forming a protective film is provided (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2004-192969 (paragraphs 0026-0031)

  FIG. 5 is a cross-sectional view showing a cross section of an organic EL display device in a general mobile communication terminal device. The mobile communication terminal device shown in FIG. 5 includes an organic EL module 1, a substrate 7, a frame 8, a double-sided tape 9, a housing 10, a screen 11, a cushion 12, and a polarizing plate 13. The organic EL module 1 includes a glass 2, a sealing can 3, a driver IC 4, a light shielding tape 5, and a flexible substrate 6.

  The polarizing plate 13 is attached to the glass 2. The glass 2 is a glass substrate, and an electrode and an organic thin film are laminated to operate as an organic EL element. The polarizing plate 13 has a polarization function for preventing the organic thin film from being deteriorated by ultraviolet rays and preventing the wiring of the electrodes from being seen from the surface of the organic module 1.

  When the method described in Patent Document 1 is applied to the organic EL display device illustrated in FIG. 5, a protective film and a polarizing plate are stacked on the surface of the substrate opposite to the stacked surface such as electrodes. . Therefore, the thickness of the protective film directly affects the thickness of the mobile communication terminal device, which may lead to an increase in the size of the mobile communication terminal device. Further, there is a problem that the cost for forming the protective film and the cost for the cleaning treatment between the protective film and the glass are required.

  Therefore, an object of the present invention is to provide an organic EL display device and a mobile phone that can be reduced in thickness and cost.

  An organic EL display device according to the present invention is an organic EL display device capable of confirming display contents via a screen that protects an organic EL element, and the screen includes a polarization function that blocks reflected light from the organic EL element, and It comprises an ultraviolet ray protection function that absorbs light in the ultraviolet wavelength region among the light incident on the screen.

  An organic EL display device according to the present invention is an organic EL display device capable of confirming display contents through a screen protecting an organic EL element, and the screen is light in an ultraviolet wavelength region out of light incident on the screen. It has the ultraviolet-ray defense function which absorbs UV, and has the transmittance | permeability of the range which cannot recognize an organic EL element visually.

  The screen may be subjected to surface strengthening treatment or antireflection treatment. According to such a configuration, it is possible to protect the screen and reduce the reflection of the light source.

  The mobile phone according to the present invention is a mobile phone capable of confirming display contents through a screen protecting the organic EL element, and the screen is incident on the screen with a polarization function for blocking reflected light in the organic EL element. It comprises an ultraviolet ray protection function that absorbs light in the ultraviolet wavelength region of light.

  The cellular phone according to the present invention is a cellular phone capable of confirming display contents through a screen protecting the organic EL element, and the screen absorbs light in an ultraviolet wavelength region out of light incident on the screen. It has a protective function and has a transmittance within a range where the organic EL element cannot be visually recognized.

  The screen may be subjected to surface strengthening treatment or antireflection treatment. According to such a configuration, it is possible to protect the screen and reduce the reflection of the light source.

  According to the present invention, since it is not necessary to provide a polarizing plate in the organic EL display device and the mobile phone, the organic EL display device and the mobile phone can be reduced in thickness and cost can be reduced.

Embodiment 1 FIG.
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a cross section of an organic EL display device in a mobile communication terminal device according to the present invention together with a substrate 7 in the mobile communication terminal device. The organic EL display device shown in FIG. 1 includes an organic EL module 1, a frame 8, a double-sided tape 9, a housing 10, a screen 11, and a cushion 12. In addition, in FIG. 1, the organic EL module 1 shows the part enclosed by the thick line. In addition, a circuit element for controlling the mobile communication terminal device is mounted on the substrate 7.

  The organic EL module 1 includes a glass 2, a sealing can 3, a driver IC 4, a light shielding tape 5, and a flexible substrate 6.

  The glass 2 is a glass substrate, and an anode (ITO) 21 (see FIG. 2), a cathode (metal) 22 (see FIG. 2), and an organic thin film 23 (see FIG. 2) are joined together to form an organic EL element. Works as.

  FIG. 2 is an explanatory diagram for explaining an example of the structure of the organic EL element. In the organic EL element illustrated in FIG. 2, an anode 21, an organic thin film 23, and a cathode 22 are sequentially laminated on a glass 2 that serves as a substrate. The organic thin film 23 is laminated between the anode 21 and the cathode 22. For example, when a voltage equal to or higher than a predetermined voltage (light emission start voltage) is applied between the two electrodes so that the anode 21 has a higher potential than the cathode 22, a current flows through the organic thin film 23 to emit light. In FIG. 1, the glass 2 is installed so that the surface to which the anode 21 is bonded is the surface opposite to the screen 11.

  The sealing can 3 is a lid for preventing oxidation of the electrode. The sealing can 3 may be a glass material. In that case, since moisture enters from the bonding portion with the glass 2, the electrode can be prevented from being oxidized by having a desiccant inside.

  The driver IC 4 is a driving device for driving the electrodes. The driver IC 4 controls display by causing a constant current to flow through the electrode where the organic EL element to be lit is present. The light shielding tape 5 is a tape for preventing a malfunction of the driver IC 4.

  A flexible substrate (FPC) 6 electrically and mechanically connects the glass 2 and the substrate 7. In particular, the substrate 7 and the driver IC 4 are electrically connected. However, in FIG. 1, the wiring for connecting the FPC 6 and the driver IC 4 is omitted. The FPC 6 connects the glass 2 and the substrate 7 by, for example, using a connector or a method such as hot pressing.

  The organic EL module 1 is physically protected and positioned by a metal or resin frame 8 and fixed to the substrate 7 by a double-sided tape 9. The organic EL module 1 is physically protected by the housing 10 and the screen 11. The cushion 12 is installed between the screen 11 and the organic EL module 1 as a dustproof measure, and prevents entry of dust and foreign matter.

  The screen 11 is a window for confirming the display content of the organic EL module 1, and has a UV (Ultraviolet) cut function and a polarization function. Therefore, the organic EL display device in the mobile communication terminal device according to the present invention does not need to include a polarizing plate.

  The UV cut function is a function of absorbing electromagnetic waves (ultraviolet rays) having a wavelength of about 400 nm or less, for example. That is, the UV cut function is a function that prevents the organic thin film 23 from being irradiated with light in the ultraviolet wavelength region of the extraneous light incident on the screen 11.

  The polarization function is a function of blocking reflected light when, for example, extraneous light incident from the screen 11 is reflected by the cathode 22. By blocking the reflected light at the cathode 22, it is possible to prevent the screen 11 from seeing electrodes and wirings.

  The screen 11 is realized by, for example, depositing a metal for blocking ultraviolet rays on an acrylic plate having a polarization function. That is, as the screen 11, a resin product having a polarization function and a UV cut function can be used. Moreover, when using the acrylic board etc. which do not have a polarizing function, what has a polarizing function can be obtained by sticking a polarizing film on an acrylic board etc., for example.

  The screen 11 generally has a thickness of about 0.5 mm to 1.0 mm in order to ensure the strength required for a mobile phone or the like. A polarizing plate having a UV cut function and a polarizing function generally has a thickness of about 0.1 mm to 0.2 mm. Therefore, there is no influence on the thickness of the screen 11 by having the UV cut function and the polarization function.

  Since it is necessary to transmit light, a resin such as acrylic or polycarbonate is generally used as the screen 11, but glass may be used. In addition, when using glass, in order to ensure intensity | strength, it is desirable to use tempered glass or to add a scattering prevention film. In addition, regardless of which material is used, the surface of the screen 11 may be subjected to a surface strengthening process such as a hard coat process, or an antireflection process such as an AR (Anti-Reflective) coat process or an antiglare process. .

  As described above, according to the first embodiment, it is not necessary to provide a polarizing plate in the organic EL display device. Therefore, the organic EL display device can be reduced in thickness and cost can be reduced.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. In general, the polarizing plate function required for the organic EL module is to prevent the organic thin film of the organic EL element from being deteriorated by ultraviolet rays, and the wiring of the electrode formed on the organic EL element is organic as described above. It is to make it invisible from the surface of the module. For this reason, the polarization function is not necessarily required.

  Further, when the screen 11 has a polarization function, there is a problem that the user of the polarized sunglasses cannot see the display of the organic EL module 1.

  In the second embodiment, the screen 11 has a UV cut function as in the first embodiment, but does not have a polarization function.

  The screen 11 is realized, for example, by vapor-depositing a metal for blocking ultraviolet rays on an acrylic plate having no polarization function. That is, a resin product having a UV cut function can be used as the screen 11.

  In the second embodiment, it is desirable that the screen 11 has a transmittance in a range where the wiring of the electrode formed on the glass 2 is not visible from the surface of the organic module 1. When lowering the transmittance of the screen 11, the organic EL module 1 is generally colored black in order to increase the display contrast, but may be other than black. Further, the screen 11 may be processed such as a half mirror.

  According to the second embodiment, in addition to the effect of the first embodiment, there is an effect that the user of the polarized sunglasses can also see the display of the organic EL display device. In addition, a filter having a polarization function has a high market share by several companies in Japan and has a high cost. Therefore, the cost can be further reduced by removing the polarization function.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a front view showing an example of a mobile phone 100 on which the organic EL display device according to the present invention can be mounted. A mobile phone 100 shown in FIG. 3 includes an upper outer casing 110, an auxiliary screen 111, a camera 112, and an antenna 113.

  The mobile phone 100 is, for example, a foldable mobile phone, has a communication function, and performs wireless communication with a base station of a mobile communication network via an antenna 113. The upper outer casing 110 is a casing that becomes the upper outer side when folded. The camera 112 includes an image sensor such as a CCD, and executes various processes such as a process of imaging a subject and converting it into digital data.

  In the following description, the upper outer casing 110 corresponds to the casing 10 in the first embodiment, and the auxiliary screen 111 corresponds to the screen 11 in the first embodiment, that is, the auxiliary screen 111. A case where the auxiliary display unit provided in the lower part of the organic EL display device is realized by the organic EL display device according to the first embodiment will be described as an example.

  The auxiliary screen 111 is a screen for confirming the display content of an auxiliary display unit (not shown) that performs auxiliary display, and is installed on the side that becomes the upper outer side when folded. The auxiliary display unit is a display unit including the organic EL module 1 (see FIG. 1). The auxiliary screen 111 has a UV cut function and a polarization function.

  That is, the auxiliary screen 111 irradiates the organic thin film 23 (see FIG. 1) included in the organic EL module 1 with light in the ultraviolet wavelength region out of the extraneous light incident on the auxiliary screen 111 as a UV cut function. It has a function to prevent

  Moreover, the auxiliary screen 111 has a function of blocking the reflected light when the external light incident from the auxiliary screen 111 is reflected by the cathode 22 (see FIG. 1) included in the organic EL module 1 as a polarization function. Have. By blocking the reflected light at the cathode 22, it is possible to prevent the auxiliary screen 111 from seeing electrodes, wiring, and the like.

  In the above description, the case where the auxiliary screen 111 has the UV cut function and the polarization function is illustrated, but it may be a main screen installed in a main display unit that performs main display.

  FIG. 4 is a perspective view showing an example of the opened state of the mobile phone 100 on which the organic EL display device according to the present invention can be mounted. Note that the state shown in FIG. 4 corresponds to a state in which the mobile phone 100 shown in FIG. 3 is opened. A mobile phone 100 shown in FIG. 4 includes an upper inner casing 120 that fits into the upper outer casing 110 shown in FIG. 3, a main screen 121, a speaker 122, a lower inner casing 130, and an operation unit 131. And a microphone 132.

  The upper inner casing 120 is a casing that becomes the upper inner side when folded, and the lower inner casing 130 is a casing that becomes the lower inner side when folded. The speaker 122 is a received voice output device for making a call, and the microphone 132 is a voice input device for making a call. The operation unit 131 has a plurality of operation keys for performing input operations of numbers and characters.

  In the following description, the upper inner housing 120 corresponds to the housing 10 in the first embodiment, and the main screen 121 corresponds to the screen 11 in the first embodiment, that is, the main screen 121. An example will be described in which the main display unit provided in the lower part is realized by the organic EL display device according to the first embodiment.

  The main screen 121 is a screen for confirming the display content of a main display unit (not shown), and is installed on the side that is the upper inner side when folded. The main display unit is a display unit including the organic EL module 1 (see FIG. 1). The main screen 121 has a UV cut function and a polarization function.

  That is, the main screen 121 irradiates the organic thin film 23 (see FIG. 1) included in the organic EL module 1 with light in the ultraviolet wavelength region out of the extraneous light incident on the main screen 121 as a UV cut function. It has a function to prevent

  Further, the main screen 121 has a function of blocking the reflected light when the external light incident from the main screen 121 is reflected by the cathode 22 (see FIG. 1) included in the organic EL module 1 as a polarization function. Have. By blocking the reflected light at the cathode 22, it is possible to prevent the main screen 121 from seeing electrodes and wirings.

  According to the third embodiment, since there is no need to provide the mobile phone with a polarizing plate, there is an effect that the mobile phone can be reduced in thickness and cost.

  In the third embodiment, the case where the auxiliary screen 111 and the main screen 121 correspond to the screen 11 included in the organic EL display device in the first embodiment has been described as an example. That is, both the auxiliary display unit and the main display unit are realized in the organic EL display device according to the first embodiment. However, only one of them may be realized by an organic EL display device. Further, the auxiliary screen 111 and the main screen 121, or the auxiliary screen 111 or the main screen 121 may correspond to the screen 11 in the second embodiment. In that case, the auxiliary screen 111 and the main screen 121 shall have only a UV cut function. Further, the upper outer casing 110 and the upper inner casing 120 may be rotatable with respect to the lower casing including the lower inner casing 130, and the inner side and the outer side may be reversed. It may not be foldable.

  In the example illustrated in FIG. 1, the case where the organic EL module 1 is fixed to the substrate 7 is illustrated, but may be fixed to the housing 10. The driver IC 4 may be mounted on the FPC 6 or the substrate 7. Furthermore, the present invention does not depend on the shape, light emission color, display capability, drive method, etc. of the organic EL module 1, and is not limited to the mobile communication terminal device, but is applied to devices including the organic EL display device. Is possible.

  The present invention can be effectively applied to an organic EL display device and a mobile phone, and in particular, can be effectively applied to achieve a reduction in thickness and cost.

It is sectional drawing which shows the cross section of the organic electroluminescence display in the portable communication terminal device by this invention. It is explanatory drawing for demonstrating the example of the structure of an organic EL element. It is a front view which shows the structural example of the mobile telephone by this invention. It is a perspective view which shows the structural example of the mobile telephone by this invention. It is sectional drawing which shows the cross section of the organic electroluminescence display in a common portable communication terminal device.

Explanation of symbols

1 Organic EL Module 2 Glass 3 Sealing Can 4 Driver IC
5 shading tape 6 flexible substrate 7 substrate 8 frame 9 double-sided tape 10 housing 11 screen 12 cushion

Claims (6)

An organic EL display device capable of confirming display contents via a screen protecting an organic EL element,
The screen has a polarizing function for blocking reflected light in the organic EL element, and an ultraviolet protection function for absorbing light in the ultraviolet wavelength region out of light incident on the screen. . An organic EL display device capable of confirming display contents via a screen protecting an organic EL element,
The said screen is equipped with the ultraviolet-ray defense function which absorbs the light of an ultraviolet wavelength area | region among the light which injected into the said screen, and has the transmittance | permeability of the range which cannot see an organic EL element. The organic EL display apparatus characterized by the above-mentioned. The organic EL display device according to claim 1, wherein the screen is subjected to surface enhancement treatment or antireflection treatment. A mobile phone capable of confirming display contents through a screen protecting an organic EL element,
The mobile phone, comprising: a polarization function that blocks reflected light from the organic EL element; and an ultraviolet protection function that absorbs light in an ultraviolet wavelength region of light incident on the screen. A mobile phone capable of confirming display contents through a screen protecting an organic EL element,
The mobile phone is provided with an ultraviolet ray protection function that absorbs light in an ultraviolet wavelength region out of light incident on the screen, and has a transmittance in a range where an organic EL element cannot be visually recognized. The mobile phone according to claim 4 or 5, wherein the screen is subjected to surface enhancement treatment or antireflection treatment.

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