JP4211258B2 - LIGHTING DEVICE MANUFACTURING METHOD, DISPLAY DEVICE USING LIGHTING DEVICE - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an illuminating device, a method for manufacturing the illuminating device, and a display device using the illuminating device, and more particularly to an illuminating device applicable as a front light arranged on the observation side of the display device.
[0002]
[Prior art]
Conventionally, in an electro-optical display device such as a liquid crystal display device, external light such as sunlight is incident on an electro-optical panel such as a liquid crystal panel from the observer side, and reflected light reflected in the electro-optical panel from incident light A reflection type display device that emits light toward the viewer is known. However, since the reflective display device may be difficult to visually recognize in a dark place, there is a reflective display device that includes an illumination device as a front light on the viewer side (observation side or viewing side) of the electro-optical panel. Proposed.
[0003]
As such a front light, a side arrangement type in which a light source is arranged on the side of an electro-optical panel and a front arrangement type in which a light source is arranged on the viewing side of the electro-optical panel are known. Among these, the former laterally arranged type front light is a light source disposed on the side of the electro-optical panel on the viewing side, and the light emitted from the light source is disposed on the viewing side of the electro-optical panel. And a light guide plate for irradiating the side. On the other hand, the latter front-facing type front light has a light emitting portion made of a light emitting element provided on a transparent substrate, and has a structure in which the light emitting direction of the light emitting element faces the electro-optical panel side.
[0004]
[Problems to be solved by the invention]
By the way, as an illuminating device applied to such a front light, there is one in which a light emitting part includes a light emitting layer interposed between, for example, a cathode and an anode. Specifically, the light emitting layer is an EL. The main component is an electroluminescent material such as the above, and light emission in the light emitting layer is realized by generating an electric field between the cathode and the anode. The light emitted from the light emitting unit in this way is incident on the above-described electro-optical panel and then reflected by the electro-optical panel, and the reflected light passes through the gap between the light emitting units formed in, for example, stripes. To the observer side. Therefore, the front light in which the light emitting portions are arranged in stripes as described above can be applied as a front arrangement type.
[0005]
By the way, in order to realize a light-emitting portion having a stripe-like microstructure, for example, a configuration in which the cathode is finely patterned in a stripe shape can be considered, but as a cathode material, for example, the electron injection efficiency from the cathode to the light-emitting layer is increased, In order to maintain stability as a cathode and ensure reflectivity, when an alkaline earth metal such as Ca having a small work function is included, the alkaline earth metal has extremely high reactivity, so that fine patterning by photoetching is possible. It is extremely difficult. Therefore, there is a method of finely patterning the cathode or the like by mask vapor deposition, but the stripe line width becomes as large as at least about 60 μm. For example, when it is used as a front arrangement type front light, a stripe-shaped shadow may be visually recognized. In some cases, a good display cannot be obtained.
[0006]
The present invention has been made in view of the above-described problems, and is an illumination device suitable for illuminating an electro-optical display device such as a liquid crystal display device as an object to be illuminated, and particularly a front light of the electro-optical display device. An object of the present invention is to provide a suitable lighting device. Another object of the present invention is to provide a manufacturing method suitable for manufacturing such a lighting device, and a display device such as a liquid crystal display device including the lighting device.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the lighting device of the present invention is a lighting device including a light emitting portion between a pair of substrates, and the light emitting portion includes at least a cathode, a light emitting layer, and an anode stacked in this order. The cathode includes an alkaline earth metal layer mainly composed of an alkaline earth metal, and the anode is a transparent electrode, and is patterned into a predetermined shape within the substrate surface.
[0008]
In this case, the light emitting portion can be patterned into a predetermined shape according to the anode patterned into a predetermined shape within the substrate surface, and can be used, for example, as a front light of an illuminated object. That is, the reflected light of the object to be illuminated can be emitted from the gap between the patterned anodes (light emitting parts) to the front side, that is, the side opposite to the object to be illuminated of the illumination device, and used for display. It becomes. In this case, since the anode is a transparent electrode such as ITO (Indium-Tin-Oxide) or IZO (Indium-Zinc-Oxide), patterning by a photo process is possible, and a fine pattern can be formed. In other words, compared to the case where an alkaline earth metal layer such as Ca, Mg or the like, which is difficult to be photoprocessed, is patterned by, for example, mask vapor deposition or the light emitting layer is patterned by, for example, coating, it is surely fine, for example 50 μm The following pattern formation can be realized. Therefore, for example, when the illumination device is used as a front light of an object to be illuminated and the reflected light from the object to be illuminated is emitted from the gap between the patterned anodes (light emitting portions), for example, the pattern shape Problems such as the shadow being visually recognized are less likely to occur.
[0009]
The anode may be patterned into a plurality of lines in the substrate surface. In this case, the illumination device can be used as a front light of the object to be illuminated, and the reflected light from the object to be illuminated can be emitted from the gaps between the anodes that are patterned in a plurality of lines. Even in this case, it is difficult to cause problems such as the fact that a linear shadow is visually recognized as described above. Specifically, the anode can be patterned into a line having a line width of 5 to 20 μm. For example, the anode can be patterned by mask evaporation (line width is about 60 μm even if the line width is small). As a result, it becomes possible to greatly reduce the size. Further, in the present invention, the area ratio of patterning formation in the light emitting portion, that is, the ratio of the patterned elements to the substrate surface is formed to be about 5 to 20%. Thereby, it is possible to realize sufficient light emission in the light emitting section and transmission of reflected light.
[0010]
In addition, the light emitting layer may include a hole transport layer, a light emitting main body layer, and a buffer layer laminated at least in this order between the anode and the cathode. Although such a hole transport layer, a light emitting body layer, and a buffer layer are often difficult to pattern finely, in the present invention, since the anode is patterned, when used as a front light It is possible to realize a light emitting portion having a fine pattern that is not visually recognized.
[0011]
The hole transport layer can be composed mainly of a conductive polymer such as PEDT (polyethylenedioxythiophene), the light emitting body layer can be composed of, for example, polymer EL, and the buffer layer can be composed mainly of LiF. In this case, the hole transport layer and the light emitting main body layer can be formed by, for example, spin coating, printing, or the like, and the buffer layer can be formed by, for example, mask deposition by vacuum deposition or the like.
[0012]
Further, the hole transport layer, the light emitting main body layer, the buffer layer, and the alkaline earth metal layer may be formed across the patterned individual anodes. That is, while the anode was patterned and formed in a linear shape or the like, the hole transport layer, the light emitting body layer, the buffer layer, and the alkaline earth metal layer were not patterned in the substrate surface, but were not patterned in an in-plane solid shape. It becomes possible to finely pattern the light emitting portion with a simple configuration. Note that the hole transport layer, the light emitting main body layer, the buffer layer, and the alkaline earth metal layer may be formed in a substantially plate shape across the entire illumination region.
[0013]
Further, the cathode has a configuration in which, for example, an alkaline earth metal layer mainly composed of Ca, Mg or the like and a reflective electrode layer mainly composed of Al or Ag are laminated, and the alkaline earth metal layer is reflected. It can be formed on the anode side of the electrode layer, and the reflective electrode layer can be patterned in the substrate surface in substantially the same shape as the anode. By providing the reflective electrode layer in this manner, the irradiation efficiency of the light to the object to be illuminated is improved. However, since the reflective electrode layer is non-transparent, it has the same shape as the anode in the substrate plane. Patterning is required, and a patterned light emitting portion can be formed by patterning such a reflective electrode layer. The alkaline earth metal layer can have a layer thickness of 2 to 40 nm. By setting it as such layer thickness, it becomes possible to form an alkaline-earth metal layer transparently, Preferably it is good to set a layer thickness to 2-10 nm.
[0014]
The reflective electrode layer can be composed mainly of, for example, an alloy of Al and Ag. In addition, a light absorption layer made of, for example, a resin black layer or a chromium layer can be formed between the cathode and the substrate, and in this case, for example, it is possible to prevent light reflected by the cathode toward the viewer side. Visibility is improved.
[0015]
Next, the lighting device as described above can be manufactured by the following method. That is, the manufacturing method of the lighting device of the present invention is a manufacturing method of a lighting device including a light emitting unit including at least a cathode, a light emitting layer, and an anode stacked in this order between a pair of substrates,
On the first substrate, at least a transparent electrode is patterned and formed in a predetermined shape on the substrate surface, an anode forming step, a light emitting layer forming step of laminating a light emitting layer on the formed anode, and on the formed light emitting layer A first substrate forming step including an alkaline earth metal layer forming step of laminating an alkaline earth metal layer as a part of a component of the cathode;
A second substrate forming step including a cathode forming step of forming at least a remaining layer of a constituent member of the cathode on the second substrate;
It comprises a substrate bonding step of bonding the first substrate formed in the first substrate forming step and the second substrate formed in the second substrate forming step.
[0016]
With such a manufacturing method, it is possible to simply provide the illumination device having the above-described configuration in which the anode is patterned into a predetermined shape. In this case, in the anode forming step, a transparent electrode can be formed by vacuum evaporation, sputtering, ion plating, etc., and then patterned into a predetermined shape by photoetching. Note that etching or resist stripping in this case can be performed by either wet or dry.
[0017]
In the light emitting layer forming step, for example, a hole transporting layer forming step for forming a hole transporting layer mainly composed of a conductive polymer and a light emitting for forming a light emitting main body layer mainly composed of a polymer EL. A main body layer forming step and a buffer layer forming step of forming a buffer layer mainly composed of LiF can be included. In the hole transport layer forming step and the light emitting body layer forming step, each layer can be formed by spin coating or printing, and in the buffer layer forming step, the buffer layer can be formed by vacuum deposition of LiF. . Furthermore, in the alkaline earth metal layer forming step, the alkaline earth metal layer can be formed by vacuum deposition of alkaline earth metal. The first substrate on which each layer is formed is preferably stored in an inert gas atmosphere or a vacuum atmosphere, for example, to prevent corrosion.
[0018]
In the anode forming step, the above-described linearly patterned anode can be formed by patterning the transparent electrode into a plurality of lines within the substrate surface. Further, in the light emitting layer forming step and the alkaline earth metal layer forming step, the light emitting layer and the alkaline earth metal layer can be formed across the entire anode patterned in a linear manner. It is possible to form solid, non-patterned layers.
[0019]
Further, the cathode formed on the second substrate can be patterned so as to substantially match the pattern shape of the anode. Thereby, even when the cathode is formed of a reflective electrode such as Al or Ag, a patterned light emitting portion can be obtained. In the cathode forming step, a component mainly composed of Al or Ag or an alloy thereof can be formed by vacuum deposition, sputtering, ion plating, or the like, and patterned into a predetermined shape by photoetching. In addition, also when forming the light absorption layer mentioned above on the 2nd board | substrate, it becomes possible to obtain the patterned light emission part by pattern-forming in a predetermined shape. In this case, for example, when the light absorption layer is formed mainly of resin black, the pattern can be formed in a predetermined shape by performing mask exposure, development, and post-baking after applying the resin black. The second substrate after forming the cathode is also preferably stored in an inert gas atmosphere or a vacuum atmosphere, for example, to prevent corrosion.
[0020]
In addition, a board | substrate bonding process can be performed under vacuum or pressure reduction, or in inert gas atmosphere, and can seal both board | substrate peripheral parts with sealing materials, such as an epoxy resin.
[0021]
Next, a display device of the present invention includes the illumination device having the above-described configuration as a light source. As described above, when a display device including the illumination device of the present invention as a light source, for example, a light source is used as a front light and reflected light is reflected from an object to be illuminated, a minute shadow or the like is visually recognized. It is possible to realize good display characteristics.
[0022]
That is, the illumination device of the present invention is preferably arranged as a light source on the display viewing side of the display device of the object to be illuminated, for example. In this case, a front light type display device can be provided. In such a display device, for example, an illuminating device as a light source is provided on the display viewing side of the illuminating body, and reflection display can be performed with reflected light from the illuminating body. In this case, an electro-optical display device such as a liquid crystal display device can be exemplified as the object to be illuminated. Furthermore, the lighting device of the present invention can also be used as a light source for exhibits exhibiting paintings, photographs, etc. in the frame.
[0023]
In the present specification, the “mainly” component means a component having the highest content among the constituent components.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, based on FIGS. 1-3, the structure of the liquid crystal display device provided with the illuminating device of embodiment which concerns on this invention is demonstrated. FIG. 1 is an exploded schematic perspective view of the liquid crystal display device of this embodiment, and FIG. 2 is a partial schematic cross-sectional view of the liquid crystal display device of this embodiment. In the present embodiment, an active matrix reflection type liquid crystal display device using TFT elements as switching elements will be described as an example of the liquid crystal display device. Moreover, in each figure, in order to make each layer and each member large enough to be recognized on the drawing, the scale is different for each layer and each member.
[0025]
First, the overall structure of the liquid crystal display device including the illumination device of the present embodiment will be described with reference to FIGS. 1 and 2, reference numeral 10 denotes a liquid crystal display device according to the present embodiment, reference numeral 20 denotes a liquid crystal panel (illuminated body), and reference numeral 30 denotes an illumination device according to the present embodiment. 1 and 2, the upper side of the liquid crystal panel 20 (liquid crystal display device 10) is the side on which the display is viewed (viewing side, that is, the observer side), and the illumination device 30 of the present embodiment is capable of viewing the liquid crystal panel 20. The liquid crystal panel 20 and the illumination device 30 are integrated, and the liquid crystal display device 10 is configured. That is, in the present embodiment, the illumination device 30 is configured as a front light that illuminates the liquid crystal panel 20 from the viewing side.
[0026]
As shown in FIGS. 1 and 2, a liquid crystal panel 20 includes an element substrate (lower substrate) 21 having a TFT element 28, a pixel electrode 29, and the like formed on the inner surface, and a counter substrate having a common electrode 24 formed on the inner surface. (Upper substrate) 22 is arranged oppositely, and a structure in which a liquid crystal layer (electro-optic material layer) 23 is sandwiched between the element substrate 21 and the counter substrate 22 is a basic configuration, and a polarizing plate is disposed on the upper side of the counter substrate 22 in the figure. A polarizer 25 such as is attached. In addition, as a basic configuration in which the liquid crystal layer 23 is sandwiched between the substrates 21 and 22, a sealing material (not shown) is interposed on the peripheral edge side of the substrates 21 and 22, and actually the substrates 21 and 22 and the sealing material are interposed between them. The liquid crystal layer 23 is sandwiched and surrounded. On the other hand, in FIG. 1, the display of the polarizer 25 and the liquid crystal layer 23 is omitted. In FIG. 2, the display of the TFT substrate 28, the pixel electrode 29, the common electrode 24, and the like formed on the inner surfaces of the element substrate 21 and the counter substrate 22 is omitted.
[0027]
Next, in this embodiment, the “inner surface” of the element substrate 21 and the counter substrate 22 means the “surface on the liquid crystal layer side” of the element substrate 21 and the counter substrate 22. As shown in FIG. 1, a large number of source lines 26 (data lines) and a large number of gate lines 27 (scanning lines) are provided in a matrix on the inner surface of the element substrate 21. A TFT element 28 is formed in the vicinity of the intersection of each source line 26 and each gate line 27, and a pixel electrode 29 is connected to each line via each TFT element 28. On the other hand, a transparent common electrode 24 made of ITO (indium tin oxide) or the like is formed on the inner surface side of the counter substrate 22 so as to correspond to the display area.
[0028]
In the liquid crystal panel 20, a region where each pixel electrode 29 is formed is a pixel 2. In a normal liquid crystal display device, a color filter for displaying red, green, and blue is provided on the inner surface of the element substrate 21. In this embodiment, the color filter is omitted, and the liquid crystal panel 20 displays black and white. Configured as a type.
[0029]
In the present embodiment, the pixel electrode 29 is made of a light reflective metal material and functions as a reflective electrode. When the place of use is a bright place, the lighting device 30 is not turned on, and external light such as sunlight or fluorescent light enters the liquid crystal panel 20 from the viewing side, and the pixel electrode 29 formed on the inner surface of the element substrate 21. The display is performed by reflecting the light and emitting the light again to the observer side (viewing side: upward in the figure). On the other hand, in a dark place, the lighting device 30 is turned on, and the light irradiated to the liquid crystal panel 20 side by the lighting device 30 is reflected by the pixel electrode 29 formed on the inner surface of the element substrate 21, and again the lighting device. 30 is passed through and is emitted to the viewer side (viewing side: upward in the figure), and display is performed. Of course, instead of using the pixel electrode 29 as a reflective layer, a reflective layer may be provided on the inner surface of the element substrate 21 separately from the pixel electrode 29.
[0030]
Next, the structure of the illumination device 30 of this embodiment provided in the liquid crystal display device 10 will be described. As shown in FIGS. 1 and 2, the illumination device 30 of the present embodiment includes a pair of transparent substrates 301 and 302 made of glass, transparent resin, and the like, and a light emitting unit 300 sandwiched between the substrates 301 and 302. It is roughly structured. Of the pair of substrates, the substrate 301 disposed on the liquid crystal panel 20 side (the lower side in the drawing) is the lower substrate, and the substrate 302 disposed on the viewing side (the upper side in the drawing) of the liquid crystal display device 10 is the upper substrate. And
[0031]
The light emitting unit 300 includes an anode 303, a light emitting layer 311, and a cathode 310 stacked in this order from the lower substrate 301 side. The anode 303 is composed of a transparent electrode made of ITO (indium tin oxide), and is patterned to have a plurality of linear shapes when the substrate 301 is viewed in plan view. In the case of the present embodiment, the line width of the patterned anode 303 is about 5 to 20 μm, and the total area of the linear anode 303 is about 5 to 20% with respect to the area of the entire illumination region.
[0032]
The light-emitting layer 311 includes a hole transport layer 304, a light-emitting main body layer 305, and a buffer layer 306 stacked in this order from the anode 303 side, and includes a plurality of linearly patterned anodes 303. It is formed across each. More specifically, the hole transport layer 304, the light emitting body layer 305, and the buffer layer 306 are formed in a solid shape in plan view across the entire illumination region of the illumination device 30 of the present embodiment.
[0033]
The cathode 310 includes an alkaline earth metal layer 307, a reflective electrode layer 308, and a light absorption layer 309 stacked in this order from the light emitting layer 311 side. The alkaline earth metal layer 307 includes a plurality of layers. It is formed in a solid shape in plan view across the anode 303, that is, across the entire illumination area. On the other hand, the reflective electrode layer 308 and the light absorption layer 309 are formed in a linear pattern that substantially matches the linear pattern of the anode 303, and are aligned with the anode 303 in the substrate stacking direction.
[0034]
Hereinafter, each layer which comprises the illuminating device 30 is demonstrated in detail.
First, the anode 303 is made of ITO as described above, and is patterned into a predetermined shape such as a linear shape, and the layer thickness of each patterned linear electrode is about 0.1 to 0.2 μm. Yes. Note that the anode 303 may be formed of a transparent electrode mainly composed of, for example, IZO (indium zinc oxide).
[0035]
The hole transport layer 304 has a function of transporting holes injected from the anode 303 to the light-emitting body layer 305, and is composed mainly of, for example, polyethylene dioxythiophene (conductive polymer), and has a layer thickness of 0.05. ˜0.2 μm.
[0036]
The light emitting main body layer 305 is made of, for example, an electroluminescent material mainly composed of polymer EL (electroluminescence: organic electroluminescent substance), and its layer thickness is set to about 0.05 to 0.2 μm. The light-emitting main body layer 305 composed of such a polymer EL can emit light at a low voltage and can emit light with high luminance. As the polymer material constituting the polymer EL, for example, a fluorene polymer derivative, a polyparaphenylene vinylene derivative, a polyphenylene derivative, a polyfluorene derivative, polyvinyl carbazole, a polythiophene derivative, or the like can be used.
[0037]
The buffer layer 306 functions as a buffer layer for accelerating the injection of electrons from the cathode 310 to the light emitting body layer 305, and is mainly composed of LiF, and the layer thickness is about 0.5 to 5 nm. Yes.
[0038]
The alkaline earth metal layer 307 constituting a part of the cathode 310 is mainly composed of Ca or Mg, and is formed as a thin film for imparting transparency, and the layer thickness is about 0.2 to 40 nm (preferably Is about 0.2 to 10 nm). Similarly, the reflective electrode layer 308 constituting the cathode 310 is mainly composed of Al, and its layer thickness is about 0.1 to 0.2 μm. Note that the reflective electrode layer 308 can be mainly composed of, for example, an Al alloy, Ag, or an Ag alloy. Furthermore, the light absorption layer 309 has a function of preventing reflected light from the reflective electrode 308 toward the observer side, and is mainly composed of resin black, and its layer thickness is about 0.5 to 2 μm. Yes. Note that the light absorption layer 309 can be mainly composed of chromium.
[0039]
As described above, in the illumination device 30 according to the present embodiment, the anode 303 mainly composed of ITO is configured by linear patterning, and the light emitting layer 311 and the alkaline earth metal layer 307 are flat across the entire illumination region. The reflective electrode layer 308 and the light absorption layer 309 are configured to substantially coincide with the linear pattern of the anode 303 while being configured in a solid shape. Therefore, the light emitting unit 300 can be configured in a linear pattern, and by using this as a front light of the liquid crystal panel 20, there is a problem that a linear shadow or the like due to the pattern formation of the light emitting unit is visually recognized. A liquid crystal display device 10 that is unlikely to occur is realized. In the case of patterning the anode 303, the reflective electrode layer 308, and the light absorption layer 309, a photo process can be used, and a hole transport layer 304, a light-emitting body layer 305, a buffer layer that are difficult to perform the photo process are used. Compared with the case where the alkaline earth metal layer is patterned into a line shape, patterning with a smaller line width can be realized. Therefore, the illuminating device 30 of the present embodiment is configured to include the light emitting unit 300 having a further miniaturized pattern.
[0040]
Next, an example of a method for manufacturing the lighting device 30 of the present embodiment provided in the liquid crystal display device 10 will be described.
First, as shown in FIG. 3, a transparent electrode (anode) 303 is linearly formed in a substrate surface on a glass substrate 301 serving as a lower substrate (anode forming step). In this case, ITO (indium tin oxide) is deposited on the substrate 301 by a predetermined deposition method such as vacuum deposition, sputtering, or ion plating, and then a resist is applied, mask exposure, development, etching, resist It uses a photo process that removes it. Therefore, the line width of the patterned anode 303 is as fine as 20 μm or less. Note that either wet or dry methods can be employed for the etching and resist removal process.
[0041]
Next, as shown in FIG. 4, polyethylene dioxythiophene (PEDT) is applied in a planar shape across each of the linearly patterned anodes 303 to form a hole transport layer 304 (positive) Pore transport layer forming step). In this case, the coating is formed by spin coating or printing. As shown in FIG. 5, a fluorene polymer derivative is applied as a polymer EL material to the upper layer of the hole transport layer 304 by spin coating or printing to form a light emitting main body layer 305 (light emission). Main body layer forming step). Further, as shown in FIG. 6, LiF is vacuum-deposited on the light emitting body layer 305 to form a buffer layer 306 (buffer layer forming step). The light emitting layer 311 is formed by such hole transport layer forming step, light emitting main body layer forming step, and buffer layer forming step (light emitting layer forming step).
[0042]
Further, as shown in FIG. 7, Ca (alkaline earth metal) is vacuum-deposited on the upper layer of the buffer layer 306 to form an alkaline earth metal layer 307 (alkaline earth metal layer forming step). In these hole transport layer forming step, light emitting body layer forming step, buffer layer forming step, and alkaline earth metal layer forming step, each layer is simply applied or vapor-deposited on the entire illumination area. Yes. Through the above steps, a first substrate including the lower substrate 301, the anode 303, the hole transport layer 304, the light emitting body layer 305, the buffer layer 306, and the alkaline earth metal layer 307 is formed (first substrate forming step). . The formed first substrate is stored in an inert gas atmosphere or a vacuum atmosphere.
[0043]
On the other hand, as shown in FIG. 8, a resin black layer serving as a light absorption layer is formed in a linear pattern within the substrate surface on a glass substrate 302 serving as an upper substrate (light absorption layer forming step). In this case, after applying resin black, mask exposure, development, and post-baking are performed to obtain a resin black with a linear pattern.
[0044]
Further, as shown in FIG. 9, a reflective electrode layer 308 is formed by laminating Al on the light absorption layer 309 formed on the glass substrate 302. In this case, Al is deposited on the glass substrate 302 or the light absorption layer 309 by a predetermined deposition method such as vacuum deposition or sputtering, and then a resist is applied, mask exposure, development, etching, and resist removal are performed. Thus, a reflective electrode layer 308 having a linear pattern laminated on the light absorption layer 309 is obtained. Note that either wet or dry methods can be employed for the etching and resist removal process. Through the above steps, a second substrate including the upper substrate 302, the light absorption layer 309, and the reflective electrode layer 308 is formed (second substrate forming step). The formed second substrate is stored in an inert gas atmosphere or a vacuum atmosphere.
[0045]
The lighting device 30 is obtained by bonding the first substrate and the second substrate obtained by the above steps as shown in FIG. Specifically, in the bonding step, the substrates are bonded in an inert gas atmosphere, and the periphery of each bonded substrate is sealed with a sealing material such as an epoxy resin. ing. In addition to the inert gas atmosphere, the pressure bonding can be performed in a reduced pressure atmosphere.
[0046]
With such a manufacturing method, it is possible to provide the illumination device of the above-described embodiment, that is, the illumination device including a light emitting unit having a miniaturized pattern. This is because an anode made of a transparent electrode such as ITO was patterned by a photo process, and in the illumination device 30 of the present embodiment, the light emitting portion was linearly patterned based on the linear patterning of the anode. Yes.
[0047]
Next, a specific example of an electronic device including the liquid crystal display device 10 of the above embodiment will be described. FIG. 11A is a perspective view showing an example of a mobile phone. In FIG. 11A, reference numeral 500 denotes a mobile phone body, and reference numeral 501 denotes a liquid crystal display unit using the liquid crystal display device 10 of the above embodiment. FIG. 11B is a perspective view illustrating an example of a portable information processing apparatus such as a word processor or a personal computer. In FIG. 11B, reference numeral 600 denotes an information processing apparatus, reference numeral 601 denotes an input unit such as a keyboard, reference numeral 603 denotes an information processing apparatus body, and reference numeral 602 denotes a liquid crystal display unit using the liquid crystal display device 10 of the above embodiment. ing. FIG. 11C is a perspective view showing an example of a wristwatch type electronic device. In FIG. 11C, reference numeral 700 denotes a watch body, and reference numeral 701 denotes a liquid crystal display unit using the liquid crystal display device 10 of the above embodiment. Each of the electronic devices shown in FIGS. 11A to 11C includes a liquid crystal display unit using the liquid crystal display device 10 of the above-described embodiment, and therefore can always perform bright reflection display using a front light. In particular, display defects such as a shadow being visually recognized are less likely to occur based on the pattern shape of the light emitting portion of the front light.
[0048]
In the embodiments described so far, the example in which the illumination device of the present invention is applied to the liquid crystal display device has been described. However, the illumination device of the present invention is not limited to the illumination device for the liquid crystal display device. is there. That is, for example, as an illumination device for illuminating exhibits such as photographs and paintings contained in a forehead, the illumination device of the present invention can be applied alone for illumination of other members and places.
[0049]
【The invention's effect】
As described above, the lighting device of the present invention is configured by linearly patterning the anode made of a transparent electrode such as ITO, and the light emitting layer and the alkaline earth metal layer are formed in a solid shape in plan view across the entire illumination area. In addition, the reflective electrode layer and the light absorption layer were configured to substantially coincide with the linear pattern of the anode. Therefore, it is possible to configure a light emitting portion composed of an anode, a light emitting layer, and a cathode in a linear pattern. By using this as a front light of a liquid crystal panel, a linear shadow or the like due to the pattern formation of the light emitting portion. It is possible to realize a liquid crystal display device that is less likely to cause problems such as being visually recognized.
[0050]
In addition, a photo process can be used in the step of patterning the anode, the reflective electrode layer, and the light absorption layer, and the hole transport layer, the light emitting body layer, the buffer layer, and the alkaline earth metal layer are linearly patterned. Compared to the case, patterning with a smaller line width can be realized. Therefore, the illumination device of the present invention has a configuration including a light-emitting portion having a further miniaturized pattern, and problems such as a linear shadow being visually recognized based on the pattern are less likely to occur.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view schematically illustrating an example of a liquid crystal display device including an illumination device according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional schematic diagram of the liquid crystal display device of FIG.
3 is an explanatory view showing a method for manufacturing the lighting device of FIG. 1. FIG.
FIG. 4 is an explanatory view showing a method for manufacturing the lighting device following FIG. 3;
FIG. 5 is an explanatory diagram illustrating a method for manufacturing the lighting device, following FIG. 4;
FIG. 6 is an explanatory diagram illustrating a method for manufacturing the lighting device, following FIG. 5;
FIG. 7 is an explanatory diagram illustrating a method for manufacturing the lighting device, following FIG. 6;
FIG. 8 is an explanatory diagram illustrating a method for manufacturing the lighting device, following FIG. 7;
FIG. 9 is an explanatory diagram illustrating a method for manufacturing the lighting device, following FIG. 8;
FIG. 10 is an explanatory diagram illustrating a method for manufacturing the lighting device, following FIG. 9;
11 is a perspective view illustrating some examples of an electronic apparatus including the liquid crystal display device according to the embodiment. FIG.
[Explanation of symbols]
10 Liquid crystal display device
20 LCD panel
30 Lighting device
300 Light emitting part
301 Lower substrate
302 Upper substrate
303 anode
304 Hole transport layer
305 Light-emitting body layer
306 Buffer layer
307 Alkaline earth metal layer
308 Reflective electrode layer
309 Light absorption layer
310 cathode
311 Light emitting layer

Claims (5)

A manufacturing method of an illumination device including a light emitting unit including a stack of at least a cathode, a light emitting layer, and an anode in this order between a pair of substrates,
An anode forming step of patterning at least a transparent electrode in a predetermined shape on the first substrate, a light emitting layer forming step of laminating a light emitting layer on the formed anode, and a cathode on the formed light emitting layer. A first substrate forming step including an alkaline earth metal layer forming step of laminating an alkaline earth metal layer as part of the constituent member so as to straddle the entire anode ;
A second substrate forming step including a cathode forming step of patterning at least a remaining layer of the cathode component on the second substrate into a shape substantially matching the transparent electrode;
A substrate laminating step for laminating the first substrate formed in the first substrate forming step and the second substrate formed in the second substrate forming step;
The said remaining layer is arrange | positioned so that it may overlap with the said transparent electrode in the state seen planarly at the time of the said board | substrate bonding process.   2. The method of manufacturing an illuminating device according to claim 1, wherein, in the anode forming step, the transparent electrode is patterned and formed into a plurality of lines in the substrate surface.   3. The light emitting layer forming step and the alkaline earth metal layer forming step are characterized in that the light emitting layer and the alkaline earth metal layer are formed across the entire anode patterned in the linear shape. The manufacturing method of the illuminating device of description.   A display device comprising a lighting device manufactured using the method for manufacturing a lighting device according to claim 1 as a light source.   It is a display apparatus provided with the illuminating device manufactured using the manufacturing method of the illuminating device of any one of Claim 1 thru | or 3 as a light source, Comprising: The said illumination to the display visual recognition side of the said display apparatus of the to-be-illuminated body A display device comprising a device.

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