JP2013120731A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a full-color self-luminous type display device with a high appearance and a small color shift accompanied with a visual field angle change.SOLUTION: A first protective film 30 and a second protective film 50 are layers common to plural light-emitting units. The plural light-emitting units include: first light-emitting units having at least first color filters; second light-emitting units having second color filters; and third light-emitting units having third color filters. Film thickness of the color filters of at least the first light-emitting units, the second light-emitting units or the third light-emitting units is different from that of the color filter of the other light-emitting units. Shapes of lens members included in the first light-emitting units, the second light-emitting units and the third light-emitting units are different from each other according to the film thickness of the color filter provided to each light-emitting unit.

Description

  The present invention relates to a display device, and more particularly, to a display device provided with an organic EL (Electroluminescence) element.

  An organic light emitting device (organic EL device, organic electroluminescence device) is composed of a pair of electrodes composed of an anode and a cathode, and an organic EL layer composed of a single layer or a plurality of layers including a light emitting layer formed between the pair of electrodes. Compound layer). Currently, organic light-emitting elements are actively researched and developed because of their features (low driving voltage, various emission wavelengths, high-speed response, and light-emitting devices can be made thinner and lighter).

  Recently, attention has been paid to a display device using a plurality of types of organic light emitting elements having different emission colors as a full color display device replacing a conventional cathode ray tube (CRT), a liquid crystal display (LCD) or the like. Here, since the organic light-emitting element is a self-luminous device, a display device including the organic light-emitting element exhibits excellent performance with respect to contrast and color reproducibility.

  On the other hand, many proposals for increasing the utilization efficiency of light output from an organic light emitting element in a display device including the organic light emitting element are disclosed. For example, Patent Document 1 discloses a proposal in which a microlens is formed on an organic light emitting element to increase the luminance in the front direction of the display device. Here, the display device proposed in Patent Document 1 collects the light emitted from the element by the microlens on the light emitting element, utilizing the fact that the light emitted from the organic light emitting element is emitted at a wide angle. As a result, the emission luminance in the front direction is increased.

  Patent Document 2 discloses a self-luminous display device that employs a color filter system in which an organic compound layer having a light emitting layer that emits white light and a colored layer of three primary colors are combined in order to obtain a display device that performs full color display. It is disclosed.

  By combining the two technologies described above, that is, the configuration composed of the white organic light emitting element shown in Patent Document 2 and the color filter provided on this element, and the microlens shown in Patent Document 1. It is expected that a high-luminance full-color display device can be obtained.

Japanese Patent Laid-Open No. 2004-039500 JP-A-8-321380

  By the way, the color filter found in Patent Document 2 is generally obtained by applying a photosensitive color resist on a substrate, exposing the resist film through an exposure mask, and developing the resist film. It is done. Incidentally, a method of forming a color filter having a predetermined pattern shape found in Patent Document 2 using a color resist is a method known at present.

  Here, in a color filter made from a color resist, it is necessary to increase the thickness of the color filter in order to produce deeper shades. However, as the thickness of the color filter increases, the light transmittance also decreases. On the other hand, in a color light emitting display device comprising a combination of a white organic light emitting element and a color filter, in order to express white, the light transmittance of each color filter is appropriately set according to the emission spectrum of the white organic light emitting element. It needs to be adjusted.

  In particular, in a white organic light emitting element, since blue color tends to be weak, it is necessary to make the thickness of the blue color filter relatively thinner than the color filters of other colors (red or green).

  However, when the thickness of the color filter formed on the white organic light emitting element is different for each color, the surface height of the microlens with respect to the substrate is periodically different when forming the microlens on the color filter. Become. Then, a periodic streak-like contrast is visually observed according to the pattern of each color, and the appearance is impaired.

  In addition, when the distance between the organic light emitting element and the microlens varies depending on the thickness of the color filter, the condensing property of the microlens differs for each color. That is, there is a difference in the viewing angle dependency (viewing angle characteristic) of luminance depending on each color. As a result, color misregistration may occur when the viewing angle changes.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a full-color self-luminous display device that has a high aesthetic appearance and little color shift due to a change in viewing angle.

The display device of the present invention includes a white light emitting element disposed on a substrate,
A first protective film provided to cover the white light emitting element;
A color filter provided on the first protective film;
A second protective film provided on the color filter and including a lens member, and a display device in which a plurality of light emitting units are disposed,
The first protective film and the second protective layer are layers common to the plurality of light emitting units,
The plurality of light emitting units includes a first light emitting unit having at least a first color filter, and a second light emitting unit having a second color filter having a thinner film thickness than the first color filter,
The shape of the lens member included in each of the first light emitting unit and the second light emitting unit is different according to the film thickness of the color filter provided in each light emitting unit.

  The display device of the present invention can suppress the color shift caused by the deterioration of the appearance quality and the change in the viewing angle caused by the difference in the film thickness of the color filter between the luminescent colors. For this reason, according to the present invention, it is possible to provide a full-color self-luminous display device having a high appearance and a small color shift accompanying a change in viewing angle.

It is a section schematic diagram showing a 1st embodiment in a display of the present invention. It is the cross-sectional schematic which shows 2nd embodiment in the display apparatus of this invention. It is a cross-sectional schematic diagram which shows 3rd embodiment in the display apparatus of this invention.

  In the display device of the present invention, a plurality of light emitting units are arranged. Here, in each light emitting unit, a white light emitting element disposed on the substrate, a first protective film provided to cover the white light emitting element, a color filter provided on the first protective film, And a second protective film provided on the color filter and including a lens member. The light emitting unit constituting the display device of the present invention includes at least a first light emitting unit having a first color filter and a second light emitting unit having a second color filter. The features of the first light emitting unit and the second light emitting unit will be described later. Hereinafter, an organic EL display device which is one of display devices will be described as a specific example, but the present invention can also be applied to a display device using other light emitting elements such as inorganic EL elements and LEDs.

  The white light emitting element that constitutes the display device of the present invention is an organic EL element that is disposed on a substrate and emits white light.

  In the display device of the present invention, the first protective film is a protective film provided to cover the white light emitting element, and is formed as a layer common to the first light emitting unit and the second light emitting unit. .

In the display device of the present invention, the color filter is a member provided on the first protective film. In the present invention, when the first color filter of the first light emitting unit and the second color filter of the second light emitting unit are compared, the film thickness of the second color filter is thinner than the first color filter. Yes. The color filters have different film thicknesses for each light emitting unit (thin film thickness of the second color filter provided in the second light emitting unit is reduced). This is because the properties of the filters are different. Specifically, the properties are different as shown in (i) and (ii) below.
(I) The color filter provided in the second light emitting unit has a lower transmittance of white light emitted from the white light emitting element than the color filter provided in the first light emitting unit. (Ii) Second light emission The brightness of the light that passes through the color filter provided in the unit is lower than the brightness of the light that passes through the color filter provided in the first light emitting unit. The second protective film is a protection provided on the color filter. The film is formed as a layer common to the first light emitting unit and the second light emitting unit, and has a lens member at a position corresponding to the arrangement position of the white light emitting element.

  In the present invention, the shape of the lens member included in each of the first light emitting unit and the second light emitting unit is provided in each light emitting unit due to the difference in film thickness of the color filter provided in each light emitting unit described above. It differs depending on the film thickness of the color filter. This means that the shape of the lens member included in each light emitting unit depends on the film thickness of the color filter provided in each light emitting unit.

  By the way, the shape of the lens member included in each light emitting unit is determined by the diameter of the lens, the radius of curvature of the lens, the thickness (thickness) of the lens itself, and the like. Here, when the planar area of each light emitting unit is substantially the same, it means that the diameter of the lens member included in each light emitting unit is substantially the same. In such a case, it is meant that the radius of curvature (lens) which is an element characterizing the shape of the lens member and / or the thickness of the lens itself depends on the thickness of the color filter included in each light emitting unit. .

  The above description relates to an organic EL display device in which two types of light emitting units having different emission colors are provided in the device, but the present invention is not limited to this.

  As a specific example, a display device in which three types of light emitting units (first light emitting unit, second light emitting unit, and third light emitting unit) having different emission colors are provided in the device will be described. In this display device, the film thickness of three types of color filters (first color filter, second color filter, and third color filter) provided for each light emitting unit is adjusted as appropriate according to the properties. For this reason, in this invention, the film thickness of the color filter which at least 1st light emission unit, 2nd light emission unit, or 3rd light emission unit has differs from the film thickness of the color filter which other light emission units have. For example, a display device in which the film thickness of the first color filter included in the first light emitting unit is made thinner than the film thickness of the color filter included in other light emitting units (second light emitting unit, third light emitting unit) will be described. . In such a display device, the shape of the lens member included in the first light emitting unit is different from the shape of the lens member included in the other light emitting units in terms of the radius of curvature of the lens member, the thickness (thickness) of the lens member itself, and the like. .

  Similarly, when there are four or more types of light emitting units, the shape of the lens member (specifically, the radius of curvature of the lens member, the thickness of the lens member itself, etc.) according to the film thickness of the color filter in each light emitting unit. Adjust appropriately.

(First embodiment)
Hereinafter, a display device according to an embodiment of the present invention will be described with reference to the drawings as appropriate. However, the present invention is not limited to the embodiments described below.

  FIG. 1 is a schematic cross-sectional view showing a first embodiment of the display device of the present invention. The display device 1 (organic EL display device) of FIG. 1 is provided with three types of light emitting units with different colors to be output, that is, a red light emitting unit 2R, a green light emitting unit 2G, and a blue light emitting unit 2B, on a substrate 10. Yes. In the display device 1 of FIG. 1, the three types of light emitting units (2R, 2G, 2B) are gathered one by one to form one pixel, and a plurality of pixels are arranged on the substrate 10 in a matrix. Yes. 1 is a top emission type display device that emits light in the opposite direction of the substrate 10 from the upper surface of an organic EL element (a white light emitting element 20 described later) formed on the substrate 10.

  Each light emitting unit (2R, 2G, 2B) has a white light emitting element 20, a protective film 30 (first protective film), a color filter 40 (40R, 40G, 40B), and a second protection on the substrate 10, respectively. The film 50 is provided in this order. By the way, the display device 1 of FIG. 1 is provided with three types of light emitting units, each of which emits different types of light. However, in the present invention, there is no particular limitation as long as there are at least two types of light emitting units with different types of emitted light.

  Hereinafter, components of the display device 1 of FIG. 1 will be described.

  As the substrate 10 constituting the display device 1 of FIG. 1, a substrate in which a pixel circuit (not shown) is formed on a base material (not shown) is used. That is, the display device 1 in FIG. 1 is an active matrix drive type display device. Note that the pixel circuit formed on the substrate can be manufactured by a known transistor manufacturing technique. The pixel circuit is composed of a plurality of transistors. An interlayer insulating film (not shown) and a planarizing film (not shown) are provided on the pixel circuit for the purpose of protecting the plurality of transistors and planarizing the substrate 10. Further, contact holes (not shown) are formed at predetermined positions in the interlayer insulating film and the planarizing film. This contact hole is provided to electrically connect the pixel circuit and the lower electrode 21 (anode) constituting the white light emitting element 20. With this contact hole, the display device 1 in FIG. 1 can be independently driven in units of pixels.

  The white light emitting element 20 provided on the substrate 10 includes a lower electrode 21 (anode) provided on the substrate 10, a white organic EL layer 22 provided on the lower electrode 21, and an upper portion provided on the white organic EL layer 22. This is a member composed of an electrode 23 (cathode).

  The lower electrode 21 is formed in a desired pattern at a position corresponding to the position where the light emitting units (2R, 2G, 2B) are provided. In the case of a top emission type organic EL display device, the lower electrode 21 (anode) is an electrode layer made of a conductive material having a high reflectance. Examples of the conductive material having high reflectivity include metal materials having high reflectivity such as Cr, Al, Ag, Au, and Pt.

  The lower electrode 21 may be a single-layer electrode having only a layer made of a conductive material having a high reflectance described above, or a layer made of a conductive material having a high reflectance and a layer made of a transparent conductive material are laminated. It may be a laminated electrode. When the lower electrode 21 is a laminated electrode, the transparent conductive material that is a constituent material of the layer made of the transparent conductive material constituting the laminated electrode is not particularly limited as long as it has excellent hole injection properties. . Examples thereof include indium tin oxide (ITO), indium zinc oxide, and zinc oxide.

  The electrode thin film constituting the lower electrode 21 can be formed using a known method such as a sputtering method. For example, Ag is deposited to a thickness of 100 nm, and ITO is deposited thereon to a thickness of 20 nm. The electrode thin film thus formed is patterned to correspond to each pixel by a known method such as photolithography patterning. In addition, the shape of the lower electrode 21 to be patterned is not particularly limited, and may be, for example, a rectangular shape (including a square), a circular shape, or the like.

  In the display device 1 of FIG. 1, the lower electrode 21 is partitioned for each light emitting unit by a partition wall 11 provided on the substrate 10. The partition 11 that partitions the lower electrode 21 for each light emitting unit (subpixel unit) is preferably made of an insulating material having excellent flatness. Among these, a material that can easily form a film by a wet method such as a coating method and can be applied with photolithography patterning is more preferable. For example, a resin material such as a photosensitive acrylic resin or a polyimide resin is preferably used. In addition, what is necessary is just to provide the partition 11 as needed and may omit it. In the case where the partition wall 11 is provided, the shape of the pixel opening obtained by patterning the partition wall 11 into a desired shape is not particularly limited, and examples thereof include a rectangular shape (including a square), a circular shape, and the like. can do. Specifically, the partition wall 11 can be processed so that each pixel opening has a circular shape with a diameter of 4 μm.

  The white organic EL layer 22 provided on the lower electrode 21 and the partition wall 11 is a laminated body composed of a single layer or a plurality of layers having at least a light emitting layer (not shown). It is a layer made of an organic compound. In the display device 1 of FIG. 1, the white organic EL layer 22 is formed as a layer common to all the light emitting units.

  Examples of the layer constituting the white organic EL layer 22 include a hole injection / transport layer, an electron block layer, a hole block layer, an electron injection / transport layer, and the like in addition to the light emitting layer (white light emitting layer). However, the present invention is not limited to these. Hereinafter, the case where the white organic EL layer 22 is a laminate including a hole injection / transport layer, a white light emitting layer, and an electron injection / transport layer in order from the anode (lower electrode 21) side will be described.

  The hole injection / transport layer is a layer composed of a single layer or a plurality of layers made of an organic compound having a function of hole injection or hole transport or both. That is, the hole injection / transport layer includes not only a hole injection layer and a hole transport layer but also a laminate composed of a hole injection layer and a hole transport layer. Moreover, a well-known material can be used as a constituent material of a positive hole injection / transport layer.

  The hole injection / transport layer can be formed and formed by a known method such as vacuum deposition. The film thickness of the hole injection / transport layer is appropriately set in consideration of the hole injection / transport ability of the material constituting the layer. For example, it is possible to form the hole injection / transport layer with a film thickness of 150 nm.

  The white light emitting layer is an organic compound layer that emits white light, and a red light emitting material, a green light emitting material, and a blue light emitting material are included in the layer. Further, the white light emitting layer may be a single layer or a laminate in which a plurality of layers are combined.

  When the white light emitting layer is a laminated body in which a plurality of layers are combined, the combination of layers is, for example, a combination of a layer containing a yellow light emitting material and a layer containing a cyan light emitting material, a layer containing an orange light emitting material and a cyan light emitting material And a combination of a layer containing a yellow light emitting material and a layer containing a blue light emitting material. In this embodiment, a case where a stacked body of a layer containing a yellow light emitting material and a layer containing a cyan light emitting material is formed will be described. In such a case, specifically, a layer containing a cyan light emitting material is first formed with a film thickness of 10 nm by a vacuum deposition method, and a layer containing a yellow light emitting material is formed thereon with a film thickness of 10 nm.

  The electron injection / transport layer is a layer composed of a single layer or a plurality of layers made of an organic compound having the functions of electron injection and / or electron transport. That is, the electron injection / transport layer includes not only the electron injection layer and the electron transport layer, but also a laminate composed of the electron injection layer and the electron transport layer. Moreover, a well-known material can be used as a constituent material of an electron injection / transport layer.

  In the present embodiment, a case where an electron transport layer and an electron injection layer are laminated in this order on a white light emitting layer will be described. In such a case, specifically, the electron transport layer is formed with a thickness of 10 nm, and then the electron injection layer is formed with a thickness of 80 nm on the white light-emitting layer by vacuum deposition.

  Similar to the white organic EL layer 22, the upper electrode 23 (cathode) formed on the white organic EL layer 22 is formed as a layer common to all the light emitting units. In the top emission type organic EL display device, the upper electrode 23 formed on the white organic EL layer 22 is a conductive material having a high transmittance so that the light extracted from the white light emitting layer can be extracted outside the device. Constructed from a functional material. That is, the upper electrode 23 is a light extraction electrode. In the present invention, high transmittance means that the visible light transmittance is 80% or more.

  As the upper electrode 23, for example, a transparent conductive film in which a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide, and zinc oxide is formed with a film thickness of about 10 nm to 1000 nm is preferably used. In addition, an electrode thin film having both semi-reflective properties and semi-transmissive properties in which a metal material such as Ag, Au, or Al is formed with a thickness of about 10 nm to 30 nm is also preferably used. In the present invention, having both semi-reflective properties and semi-transmissive properties means the property of reflecting part of the light emitted inside the device and transmitting part of it. Semi-reflective specifically means that the reflectance with respect to visible light is 20% to 80%. In the present embodiment, for example, the upper electrode 23 can be formed by depositing ITO with a film thickness of 1000 nm by a sputtering method.

The protective film 30 (first protective film) provided on the white light emitting element 20 is formed to protect the white light emitting element 20 from the photolithographic process performed when forming the oxygen and moisture in the air and the color filter 40. The The constituent material of the protective film 30 is an insulating material having optical transparency. Specifically, an insulating film such as SiN, SiON, SiO ₂ or Al ₂ O ₃ can be used. The protective film 30 is formed by a known method such as a CVD method. The protective film 30 is desirably formed with a uniform thickness at least in the light emitting region of each light emitting unit. In this embodiment, SiN is formed with a film thickness of 2 μm by CVD.

  A color filter 40 made of a color resist is formed on the protective film 30 (first protective film). In the display device 1 of FIG. 1, color filters corresponding to the colors of light emitted by three types of light emitting units (red light emitting unit 2R, green light emitting unit 2G, and blue light emitting unit 2B) are provided. Specifically, a red color filter 40R, a green color filter 40G, and a blue color filter 40B are provided. The color filter of each color can be produced at a position corresponding to the light emitting unit of each color by repeating film formation (coating) and processing (patterning).

In the present embodiment, as shown in FIG. 1, the film thickness (d _B ) of the blue color filter 40B is set thinner than the other color filters (40R, 40G). As the thickness of the color filter 40 made of a color resist increases, light output from the white light emitting element can be transmitted with high color purity, but at the same time, the transmittance of the filter itself decreases. For this reason, it is necessary to appropriately adjust the film thickness of the color filter 40 in accordance with the wavelength of light to be extracted in consideration of the light transmittance of each color filter. Therefore, in the present embodiment, considering that the luminance of the light transmitted through the blue color filter is lower than that of the other color filters (red color filter, green color filter), the blue color filter 40B has a luminance balance. The film thickness is set thin. Specifically, the thickness d _G of thickness d _B, the red color filter 40R thickness d _R and the green color filter 40G and blue color filter 40B, respectively 1 [mu] m, 2 [mu] m, is set to 2 [mu] m.

  After the color filter 40 is formed, a second protective film 50 having a lens member 52 (microlens) is formed on the color filter 40. In the present embodiment, the second protective film 50 is a member in which an overcoat layer 51 and a lens member 52 are laminated in this order.

  The overcoat layer 51 is a member provided to cover and protect the color filter 40 and to smooth the surface by filling the steps and gaps between the color filters (40R, 40G, 40B). The overcoat layer 51 is formed of, for example, a transparent resin such as an acrylic resin. In consideration of the light collection rate of each light emitting unit, it is preferable to form the overcoat layer 51 as thin as possible. In this embodiment, for example, an acrylic resin is formed (coated) with a film thickness of 200 nm.

The lens member 52 (microlens) formed on the overcoat layer 51 is a member formed in an array and a hemisphere. The constituent material of the microlens is not particularly limited as long as it is a transparent material. For example, it is made of an inorganic oxide transparent film such as SiN, SiON, SiO ₂ or Al ₂ O ₃ or a resin film such as acrylic, epoxy or phenol resin. Here, the microlens can be manufactured by any one of the manufacturing methods shown in the following (1) to (6).
(1) A method in which a resin layer patterned by a photolithography process or the like is heat-treated, and the resin layer is deformed into a microlens shape by reflow.
(2) A method of forming a microlens by forming a photocurable resin layer with a uniform film thickness, then exposing it to light having a distribution in the in-plane direction, and developing the exposed resin layer.
(3) A method of forming a transparent thin film made of an inorganic material with a uniform film thickness and then processing the transparent thin film into a microlens shape by a photolithography process.
(4) A method of processing the surface of a transparent thin film or resin layer made of an inorganic material formed with a uniform film thickness by irradiation with an ion beam, electron beam, laser, or the like into a microlens shape.
(5) A method of forming a microlens in a self-aligning manner by dropping an appropriate amount of resin on each pixel.
(6) A method of forming a microlens by preparing a resin sheet in which microlenses are formed in advance separately from the substrate on which the organic light emitting element is formed, aligning the two, and then bonding them together.

In this embodiment, the microlens is formed in an array and a hemisphere using the method (2). Specifically, first, a positive resist is uniformly coated with a film thickness of 5 μm, and then gradation exposure using a gray scale mask is performed and development is performed to form a microlens. At this time, the gray scale mask is designed so that the shape of the lens member 52B provided in the blue light emitting unit 2B is different from the shape of the lens members 52R and 52G provided in the other light emitting units (2R, 2G). Specifically, the following (i) and (ii) are satisfied.
(I) Align the height of the apex of each lens member (52B, 52G, 52R) (ii) The curvature radius of the lens member 52B provided in the blue light emitting unit 2B is set to the lens member (52G provided in another light emitting unit). 52R), more specifically, the size of each lens member is set as shown in Table 1 below. However, what is shown in the following Table 1 is only one specific example, and the present invention is not limited to this.

  A protective member such as a thermoplastic epoxy resin film may be further provided on the lens member 52 for the purpose of protecting the surface thereof.

  In the display device manufactured in the present embodiment, the appearance of the device is excellent in aesthetic appearance without periodic streak-like contrast. In addition, when all pixels are turned on and displayed in white, the color shift at a point 30 ° (viewing angle 30 °) in the direction perpendicular to the substrate (viewing angle 0 °) is L * u * v *. In the color system, Δu′v ′ = 0.015.

[Comparative Example 1]
On the other hand, when the shapes of the lens members (52B, 52G, 52R) included in each light emitting unit (2B, 2G, 2R) were unified, periodic streak-like contrast was recognized in the appearance of the display device. This is because the height of the lens members (52B, 52G, 52R) with respect to the substrate 10 is different. In the case of white display, the color shift at a point 30 ° (viewing angle 30 °) with respect to the direction perpendicular to the substrate (viewing angle 0 °) is Δu′v ′ = 0.056.

  As described above, the display device according to the present embodiment is a display device that is superior in appearance appearance and suppresses color misregistration accompanying a change in viewing angle as compared with the display device of Comparative Example 1 described above.

(Second embodiment)
FIG. 2 is a schematic cross-sectional view showing a second embodiment of the display device of the present invention. In addition, the same code | symbol is attached | subjected about the member same as the member contained in the display apparatus 1 of FIG. The display device 3 in FIG. 2 has the same radius of curvature of the lens members (52B, 52G, 52R) provided in each light emitting unit (2B, 2G, 2R) as compared to the display device 1 in FIG. This is different from the display device 1 of FIG.

  On the other hand, the display device 3 of FIG. 2 has the same apex height of the lens members (52B, 52G, 52R) with respect to the substrate 10 as the display device 1 of FIG. This is because the thickness (thickness) of the lens member 52B provided in the blue light emitting unit 2B where the film thickness of the color filter is thin is made larger than the thickness of the lens members (52G, 52R) provided in the other light emitting units. Because. That is, the display device 3 in FIG. 2 adjusts the height of the apex of the lens member (52B, 52G, 52R) with respect to the substrate 10 by the thickness (thickness) of the lens member (52B, 52G, 52R).

Specifically, in the present embodiment, the lens member (52B, 52G, 52R) provided in each light emitting unit (2B, 2G, 2R) has a lens diameter of 7 μm and a curvature radius of 8 μm. Further, as shown in FIG. 2, the lens members are formed so that the heights of the vertexes of the lens members (52B, 52G, 52R) with respect to the substrate 10 are aligned. In the present embodiment, as in the first embodiment, the film thickness d _B of the blue color filter 40B, the film thickness d _R of the red color filter 40R, and the film thickness d _G of the green color filter 40G are 1 μm, respectively. 2 μm and 2 μm are set. For this reason, the thickness (thickness) of the lens member 52B provided in the blue light emitting unit 2B is set to be 1 μm larger than the thickness (thickness) of the lens member provided in the other light emitting units.

  In the display device 3 manufactured in the present embodiment shown in FIG. 2, no periodic streak-like contrast is recognized in the appearance of the device, and the device is excellent in aesthetics. In addition, when all pixels are turned on and displayed in white, the color shift at a point 30 ° (viewing angle 30 °) in the direction perpendicular to the substrate (viewing angle 0 °) is L * u * v *. In the color system, Δu′v ′ = 0.010.

(Third embodiment)
FIG. 3 is a schematic cross-sectional view showing a third embodiment of the display device of the present invention. In addition, the same code | symbol is attached | subjected about the member same as the member contained in the display apparatus 1 of FIG. 3 is different from the display device 1 in FIG. 1 in that the film thickness of the color filters (40B, 40G, 40R) and the radius of curvature of the lens members (52B, 52G, 52R) are the same for each light emitting unit (2B). 2G, 2R) is different from the display device 1 in FIG.

  Here, in the display device 4 of FIG. 3, the film thickness of the color filter (40B, 40G, 40R) and the radius of curvature of the lens member (52B, 52G, 52R) are set as shown in Table 2 below, for example. Yes. However, what is shown in Table 2 below is only one specific example, and the present invention is not limited to this.

  As shown in Table 2, setting the film thickness of the color filter 40G provided in the green light emitting unit 2G to be thinner than the film thickness of the color filter 40R provided in the red light emitting unit 2R This is to increase the emission luminance.

  In the display device 4 manufactured in the present embodiment shown in FIG. 3, no periodic streak-like contrast is recognized in the appearance of the device, which is excellent in aesthetics. In addition, when all pixels are turned on and displayed in white, the color shift at a point 30 ° (viewing angle 30 °) in the direction perpendicular to the substrate (viewing angle 0 °) is L * u * v *. In the color system, Δu′v ′ = 0.013.

  In the display device of the present invention described above, the lens member 52 may have a hemispherical shape or a semicylindrical shape that can be called a bowl shape. When the shape of the lens member 52 is a semi-cylindrical shape (a bowl shape), the lens member 52 has a condensing function particularly in either the vertical direction or the horizontal direction. When the shape of the lens member 52 is a semi-cylindrical shape (a saddle shape), the end portion in the length direction of the semi-cylindrical lens member 52 may be a hemispherical shape, and the end face is with respect to the substrate 10. It may be formed vertically.

  By the way, in the present invention, as a method of forming the lens member 52 while controlling the radius of curvature of the lens, the thickness (thickness) of the lens itself, a method of changing the design of the gray scale mask according to the color of the color filter will be described. did. However, the shape of the microlens may be controlled using other methods such as changing the exposure condition and the etching condition for each light emitting unit using the same mask.

  The display device of the present invention can be used for mobile applications where it is important to improve visibility due to high brightness, for example, a rear monitor of a digital camera, a display for a mobile phone, and the like. Moreover, since low power consumption is expected even at the same luminance, it is also useful for indoor use such as lighting.

  1 (3, 4): display device (organic EL display device), 10: substrate, 11: partition, 20: white light emitting element, 21: lower electrode, 22: white organic EL layer, 23: upper electrode, 30: protection Layer (first protective film), 40 (40R, 40G, 40B): color filter, 50: second protective film, 51: overcoat layer, 52: lens member (microlens)

Claims (5)

A white light emitting element disposed on a substrate;
A first protective film provided to cover the white light emitting element;
A color filter provided on the first protective film;
A second protective film provided on the color filter and including a lens member, and a display device in which a plurality of light emitting units are disposed,
The first protective film and the second protective film are layers common to the plurality of light emitting units,
The plurality of light emitting units includes a first light emitting unit having at least a first color filter, and a second light emitting unit having a second color filter having a thinner film thickness than the first color filter,
The display device, wherein the shape of the lens member included in each of the first light emitting unit and the second light emitting unit is different depending on the film thickness of the color filter provided in each light emitting unit. A white light emitting element disposed on a substrate;
A first protective film provided to cover the white light emitting element;
A color filter provided on the first protective film;
A second protective film provided on the color filter and including a lens member, and a display device in which a plurality of light emitting units are disposed,
The first protective film and the second protective film are layers common to the plurality of light emitting units,
The plurality of light emitting units includes at least a first light emitting unit having a first color filter, a second light emitting unit having a second color filter, and a third light emitting unit having a third color filter,
The film thickness of the color filter that at least the first light emitting unit, the second light emitting unit, or the third light emitting unit has is different from the film thickness of the color filter that the other light emitting units have,
The shape of the lens member included in each of the first light emitting unit, the second light emitting unit, and the third light emitting unit is different depending on the film thickness of a color filter provided in each light emitting unit. Display device.   The display device according to claim 1, wherein a radius of curvature of the lens member differs according to a film thickness of the color filter.   3. The display device according to claim 1, wherein a radius of curvature of the lens member decreases as the film thickness of the color filter increases.   5. The display device according to claim 1, wherein heights of apexes of the lens member with respect to the substrate are the same. 6.

Images