JP4412059B2 - Organic EL devices, electronic devices - Google Patents

Description

  The present invention relates to an organic EL device and an electronic device.

  2. Description of the Related Art In recent years, an organic EL device including a plurality of organic electroluminescence (hereinafter referred to as organic EL) elements for each pixel as a means for displaying information has been proposed in electronic devices such as notebook computers, mobile phones, and electronic notebooks. In general, an organic EL element has a configuration in which an organic functional layer including an organic EL layer (light emitting layer) is disposed between a pair of opposed electrodes.

As such an organic EL device, for example, Patent Document 1 discloses a configuration in which an optical resonator is provided to reduce the half-value width of the emission spectrum of each pixel.
JP-A-8-213174

  In the organic EL device disclosed in Patent Document 1, an optical resonator structure is configured by a translucent reflective layer and a reflective layer sandwiching an organic EL layer as a light emitting layer, and a spectrum of light emitted from the light emitting layer. It is possible to realize a reduction in the half-value width, improvement in luminous efficiency, generation of coherent light, and the like. Here, in the case where an optical resonator having the same structure is formed for each color pixel, it is often difficult to optimize all colors. This is because when the structure of the optical resonator is optimized with respect to the emission wavelength to be optimized, it is necessary to greatly vary the film thickness of the organic EL layer for each color pixel. In particular, in the organic EL layer of a red (R) pixel, it must be made extremely thick, leading to an increase in driving voltage and a decrease in efficiency. In addition, although the color display range is generally narrow in an organic EL device, the color display range can be widened by introducing an optical resonant structure, while the light emission efficiency may decrease with the introduction of the optical resonant structure. .

  The present invention has been made in view of the above problems, and an object thereof is to provide an organic EL device capable of suppressing a decrease in light emission efficiency while improving color purity by introducing an optical resonator structure. Another object of the present invention is to provide an electronic device with excellent reliability.

In order to solve the above-described problems, an organic EL device according to an embodiment of the present invention transmits a light-reflective electrode, an organic EL layer, a light-transmissive electrode, and part of the emitted light from the organic EL layer. An organic EL device comprising a plurality of pixels laminated in this order with a semi-transmissive reflective layer that constitutes an optical resonator with the light reflecting electrode by reflecting a part thereof, Among the plurality of pixels, the first organic EL layer arranged in the first pixel and the second organic EL layer arranged in the second pixel emit light different from each other, and the first The light emitted from the organic EL layer is higher in color purity than the light emitted from the second organic EL layer, and the area of the first transflective layer disposed in the first pixel is the light emitted from the first pixel. The area of the second transflective layer that is smaller than the area of the region and is disposed in the second pixel is the second area. The area of the first transflective layer with respect to the area of the light emitting region of the first pixel is smaller than the area of the light emitting region of the first pixel, and the area ratio of the first transflective layer to the area of the light emitting region of the second pixel is It is characterized by being smaller than the layer area ratio.
The organic EL device according to an embodiment of the present invention further includes a bank section that partitions the first organic EL layer and the second organic EL layer.
The organic EL device according to an embodiment of the present invention is characterized in that the organic EL layer is composed of a polymer organic EL material.
An electronic apparatus according to an embodiment of the present invention includes the above-described organic EL device.
An organic EL device according to a reference example of the present invention is an organic EL device including an organic EL layer formed between a light reflective electrode and a light transmissive electrode, and the organic EL layer includes a plurality of organic EL layers. A transflective layer that is configured to be capable of emitting colors and capable of emitting one emission color per pixel unit and that transmits or reflects light from the organic EL layer is the transflective layer The organic EL layer is sandwiched between the light-reflecting electrode and the transflective layer within the pixel has a different reflectance between the pixels having different emission colors. It is characterized by.

  According to such an organic EL device, the transflective layer forms an optical resonator with the light reflective electrode, that is, the light emitted from the organic EL layer to the light reflective electrode side is Reflected by the reflective electrode, and as a result, resonated between the light reflective electrode and the transflective layer. And, as a result of resonance, the reflected light is transmitted through a wavelength that can be transmitted through the transflective layer. On the other hand, a part of the light emitted from the organic EL layer to the transflective layer side is transmitted through the transflective layer and the other part is reflected by the transflective layer. As a result, the light reflective electrode And the transflective layer. And, as a result of resonance, the reflected light is transmitted through a wavelength that can be transmitted through the transflective layer. As described above, the light transmitted through the transflective layer is emitted from the organic EL device and used for display. In the present invention, the reflected light is transmitted through the transflective layer after resonance. Therefore, the color purity of the light emitted from the organic EL device is improved.

  Further, in the present invention, since the reflectance of the transflective layer is configured to be different between pixels of different colors, for example, among organic EL layers used, an organic EL layer having a relatively low color purity is used. In the included pixel, the reflectance of the transflective layer can be made relatively high. On the other hand, in a pixel including an organic EL layer with relatively high color purity, the reflectance of the semi-transmissive reflective layer can be configured to be relatively low. By adopting such a configuration, it is possible to minimize the reduction in light emission efficiency that may be caused by the introduction of the semi-transmissive reflective layer while maintaining the effect of improving the color purity by introducing the semi-transmissive reflective layer. .

  In the organic EL device of the present invention, the organic EL layer is composed of a polymer organic EL material, and is configured to emit red, green, and blue colors, while the reflectance of the transflective layer in the pixel Can be configured to have a relationship of (reflectance at a red pixel) <(reflectance at a green pixel) <(reflectance at a blue pixel).

  When a polymer organic EL material is used as the organic EL layer, generally, the color purity of red can be relatively high, while the color purity of green and blue (particularly blue) is relatively low. Therefore, as described above, the reflectance at the red pixel is relatively lowered, while the reflectance at the green pixel and further the blue pixel is relatively increased, so that the color purity of each color pixel is increased. Can be raised uniformly. Further, while uniformly increasing the color purity in this way, it is possible to suitably suppress the reduction of the light emission efficiency by reducing the reflectance in the red pixel originally having a high color purity.

  As a method for making the reflectance of the semi-transmissive reflective layer different for each pixel, for example, the in-plane occupation area of the semi-transmissive reflective layer in the pixel can be made different for each pixel having a different emission color. In this case, when the organic EL layer is composed of a polymer organic EL material and configured to emit red, green, and blue colors, the area occupied by the transflective layer in the plane within the pixel is (red Occupied area of pixels) <(occupied area of green pixels) <(occupied area of blue pixels).

  As described above, the organic EL device according to the present invention is characterized in that the reflectance of the transflective layer (for example, the occupied area in the plane) is increased in the order of red, green, and blue. It is good also as what does not form a semi-transmissive reflective layer. That is, in the organic EL device of the present invention, the transflective layer can be formed selectively with respect to green and blue pixels.

  Further, for the green and blue pixels, a red absorption filter that absorbs red can be selectively formed on the light emitting side with respect to the transflective layer. In this case, even if a polarizing plate or the like is not provided on the light emission side (display surface side) of the organic EL device, the problem that external light reflected by the transflective layer is emitted from the organic EL device is solved. Will be able to. Therefore, it is possible to provide an organic EL device having high contrast, high color purity, and excellent IVL (current-voltage-luminance) characteristics. The light transmissive electrode may be formed on the inner surface of a predetermined light transmissive substrate, and the red absorption filter may be formed on the inner surface of the light transmissive substrate. In this case, by introducing the red absorption filter, it is possible to solve the problem that unevenness or the like is generated on the outer surface of the organic EL device, and it is possible to protect the red absorption filter by the translucent substrate.

  Next, an electronic apparatus according to the present invention includes the organic EL device according to the present invention as a display unit, for example. According to such an electronic apparatus, it is possible to realize display with high color purity and high contrast.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing to be referred to, the scale may be different for each layer or each member in order to make the size recognizable on the drawing.

(First embodiment)
FIG. 1 is an explanatory view schematically showing a main part of an active matrix type organic EL device 1 in particular, regarding an embodiment of the organic EL device of the present invention. The organic EL device 1 employs an active driving method using thin film transistors.

  The organic EL device 1 includes a circuit element unit 14 including a thin film transistor as a circuit element, a pixel electrode (anode) 111, a functional layer 110 including an organic EL layer (organic EL element), a cathode 12, and a seal on a substrate 2. It has a structure in which stop portions 3 and the like are sequentially stacked.

  As the substrate 2, a glass substrate is used in this example. In addition to the glass substrate, various known substrates used for electro-optical devices and circuit substrates such as a silicon substrate, a quartz substrate, a ceramic substrate, a metal substrate, a plastic substrate, and a plastic film substrate are applied. In the substrate 2, a plurality of pixel areas A as light emitting areas are arranged in a matrix, and when performing color display, for example, corresponding to each color of red (R), green (G), and blue (B). The pixel area A is configured in a predetermined array. In each pixel region A, a pixel electrode 111 is arranged, and in the vicinity thereof, a signal line 132, a power supply line 133, a scanning line 131, scanning lines for other pixel electrodes (not shown), and the like are arranged.

  The sealing portion 3 prevents water and oxygen from entering and prevents the cathode 12 or the functional layer 110 from being oxidized. The sealing portion 3 is applied to the substrate 2 and the sealing is bonded to the substrate 2. Substrate 3b (sealing can) is included. As the material of the sealing resin, for example, a thermosetting resin or an ultraviolet curable resin is used, and in particular, an epoxy resin that is one kind of thermosetting resin is preferably used. The sealing resin is annularly applied to the periphery of the substrate 2 and is applied by, for example, a microdispenser. The sealing substrate 3b is made of glass, metal, or the like, and the substrate 2 and the sealing substrate 3b are bonded to each other via a sealing resin.

FIG. 2 shows a circuit structure of the organic EL device 1.
In FIG. 2, a plurality of scanning lines 131, a plurality of signal lines 132 extending in a direction intersecting the scanning lines 131, and a plurality of power supply lines 133 extending in parallel to the signal lines 132 are wired on the substrate 2. Has been. Further, the pixel region A is formed at each intersection of the scanning line 131 and the signal line 132.
For example, the data line driving circuit 103 including a shift register, a level shifter, a video line, and an analog switch is connected to the signal line 132. The scanning line 131 is connected to a scanning side driving circuit 104 including a shift register and a level shifter.

  In the pixel region A, a first thin film transistor 123 for switching in which a scanning signal is supplied to the gate electrode via the scanning line 131 and a holding for holding an image signal supplied from the signal line 132 via the thin film transistor 123. A capacitor 135, a second driving thin film transistor 124 to which an image signal held by the holding capacitor 135 is supplied to the gate electrode, and the power line 133 when electrically connected to the power line 133 through the thin film transistor 124 Are provided with a pixel electrode 111 (anode) through which a drive current flows, and a functional layer 110 sandwiched between the pixel electrode 111 and the counter electrode 12 (cathode). The functional layer 110 includes an organic EL layer as an organic EL element.

  In the pixel region A, when the scanning line 131 is driven and the first thin film transistor 123 is turned on, the potential of the signal line 132 at that time is held in the holding capacitor 135, and the second potential is changed depending on the state of the holding capacitor 135. The conductive state of the thin film transistor 124 is determined. In addition, a current flows from the power supply line 133 to the pixel electrode 111 through the channel of the second thin film transistor 124, and further a current flows to the counter electrode 12 (cathode) through the functional layer 110. The functional layer 110 emits light according to the amount of current at this time.

FIG. 3 is an enlarged view of the cross-sectional structure of the display region in the organic EL device 1. FIG. 3 shows a cross-sectional structure of three pixel regions corresponding to red (R), green (G), and blue (B) colors. As described above, the organic EL device 1 includes the circuit element unit 14 in which a circuit such as a TFT is formed on the substrate 2, the pixel electrode (anode) 111, the light emitting element unit 11 in which the functional layer 110 is formed, and The cathode 12 is formed by sequentially laminating.
In the organic EL device 1, light emitted from the functional layer 110 to the substrate 2 side passes through the circuit element unit 14 and the substrate 2 and is emitted to the lower side (observer side) of the substrate 2, and the functional layer 110. The light emitted from the opposite side of the substrate 2 is reflected by the cathode 12, passes through the circuit element unit 14 and the substrate 2, and is emitted to the lower side (observer side) of the substrate 2.

  In the circuit element portion 14, a light shielding layer BM made of a light shielding material is formed in an island shape on the substrate 2, and further, a base protective film 2c made of a silicon oxide film is formed so as to cover the island. On the base protective film 2c, an island-shaped semiconductor film 141 made of polycrystalline silicon is formed at a position overlapping the light shielding layer BM in a planar manner. Note that a source region 141a and a drain region 141b are formed in the semiconductor film 141 by high concentration P ion implantation. A portion where P is not introduced is a channel region 141c.

Further, a transparent gate insulating film 142 that covers the base protective film 2c and the semiconductor film 141 is formed in the circuit element portion 14, and the gate insulating film 142 is made of Al, Mo, Ta, Ti, W, or the like. A gate electrode (scanning line) 143 is formed. A transparent first interlayer insulating film 144a and a second interlayer insulating film 144b are formed on the gate electrode 143 and the gate insulating film 142. As each interlayer insulating film, for example, a transparent insulating film made of SiO ₂ or SiN with an appropriate film thickness (for example, about 200 nm) can be adopted.
The gate electrode 143 is provided at a position corresponding to the channel region 141c of the semiconductor film 141. In addition, contact holes 145 and 146 are formed through the first and second interlayer insulating films 144a and 144b and connected to the source and drain regions 141a and 141b of the semiconductor film 141, respectively.

On the second interlayer insulating film 144b, a semi-transmissive reflective layer 126 made of a light reflective material such as Al is formed in an island shape with a predetermined pattern, and further, a transparent transparent layer made of ITO or the like is formed so as to cover it. The pixel electrode 111 is formed in an island shape.
The pixel electrode 111 is connected to the TFT 123 through the contact hole 145 described above. The other contact hole 146 is connected to the power supply line 133. In this way, the driving thin film transistor 123 including the semiconductor film 141 connected to the pixel electrode 111 is formed in the circuit element portion 14. The circuit element unit 14 is also formed with the storage capacitor 135 and the switching thin film transistor 124 described above, but these are not shown in FIG.

  As described above, the transflective layer 126 and the pixel electrode 111 are formed on the second interlayer insulating film 144b. The transflective layer 126 has red (R), green (G), and blue (B). Each pixel has a different reflectance. Specifically, the transflective layer 126 of each pixel is formed so that the inequality relationship is (reflectance of red pixel) <(reflectance of green pixel) <(reflectance of blue pixel). Here, in order to vary the reflectance, the ratio of the in-plane occupation area in each pixel of the transflective layer 126 is (occupied area in red pixels): (occupied area in green pixels): (blue Occupying area in the pixel) = 0: 50: 50. Thereby, the reflectance ratio of the transflective layer 126 in this embodiment is (reflectance of the transflective layer of the red pixel): (reflectance of the transflective layer of the green pixel): (blue pixel) Of the semi-transmissive layer) = 0: 50: 50.

  The transflective layer 126 has a function of reflecting part of the light emitted from the organic EL layer (light emitting layer) 110b in the functional layer 110 and transmitting part of the light, and overlaps the pixel opening or the pixel opening. It is formed in a slightly larger planar shape. The transflective layer 126 is formed by forming a reflective metal film made of aluminum or the like into a thin film of about 10 nm.

  The pixel electrode 111 is formed by patterning into a substantially rectangular shape in plan view. The thickness of the pixel electrode 111 is preferably in the range of 50 nm to 200 nm (for example, 70 nm).

  The light emitting element portion 11 is formed on the transflective layer 126 and the pixel electrode 111 as described above. The light emitting element portion 11 is mainly configured by a functional layer 110 stacked on the pixel electrode 111 and a bank portion 112 that is disposed between the functional layers 110 and partitions each functional layer 110. A cathode 12 made of a reflective metal film such as aluminum is disposed on the functional layer 110. The optical distance between the transflective film 126 and the cathode 12 is designed to be the same as or an integral multiple of the emission wavelength of the pixel. The cathode 12 constitutes an optical resonator for light that is desired to be extracted from the pixel.

As shown in FIG. 3, the bank unit 112 is a laminate of an inorganic bank layer (first bank layer) 112 a located on the substrate 2 side and an organic bank layer (second bank layer) 112 b located away from the substrate 2. It is composed of. The inorganic bank layer 112a is made of an inorganic material such as SiO ₂ or TiO ₂ , for example. The organic bank layer 112b is formed of a resist having heat resistance and solvent resistance such as acrylic resin and polyimide resin.

The functional layer 110 includes a hole injection / transport layer 110a stacked on the pixel electrode 111 and an organic EL layer (light emitting layer) 110b formed adjacent to the hole injection / transport layer 110a. Has been.
The hole injection / transport layer 110a has a function of injecting holes into the organic EL layer 110b and a function of transporting holes inside the hole injection / transport layer 110a. By providing such a hole injection / transport layer 110a between the pixel electrode 111 and the organic EL layer 110b, device characteristics such as light emission efficiency and lifetime of the organic EL layer 110b are improved. Further, in the organic EL layer 110b, holes injected from the hole injection / transport layer 110a and electrons injected from the cathode 12 are recombined in the organic EL layer, and light emission is obtained.

  Note that the hole injection / transport layer 110a is formed by forming a mixture (PEDOT / PSS) of a polythiophene derivative such as polyethylene dioxythiophene (PEDOT) and polystyrene sulfonic acid (PSS) by an inkjet method. The thickness is commonly adjusted to 50 nm.

The organic EL layer 110b, in the pixel of red (R), are composed of red organic EL layer 110b ₁ made of a polymer material that emits red (R), the pixel of Like green (G), green (G ) to be configured by the green organic EL layer 110b ₂ made of a polymer material that emits light, a further pixel of blue (B), composed of blue organic EL layer 110b ₃ made of a polymer material that emits blue light (B) Has been. Each color pixel is arranged in a predetermined arrangement (for example, a stripe shape). Each of the organic EL layers 110b ₁ , 110b ₂ , and 110b ₃ is formed by forming each light emitting material (polymer material) by an ink jet method, and has a thickness of 80 nm for a red pixel, 80 nm for a green pixel, The blue pixel is about 70 nm.

As the light emitting material for forming the red organic EL layer 110b _1, for example, there can be used those made of organic EL material such as PPV and MEH-PPV, or polyfluorene addition of rhodamine dye, a green organic EL layer 110b ₂ As a light emitting material to be formed, a material made of an organic EL material such as a fluorene derivative such as a PPV derivative or F8BT + polydioctylfluorene can be used. As the light emitting material for forming a blue organic EL layer 110b _3, you can be used, for example made of an organic EL material such as polydioctylfluorene derivatives.

On the other hand, after patterning the pixel electrode 111, the bank 112 first forms an inorganic bank layer 112a made of an inorganic material such as SiO ₂ to a thickness of about 50 nm with a pixel opening, and then polyimide or the like. The organic bank layer 112b made of the above organic material is obtained by forming a pixel opening having a thickness of about 2 μm.

  Next, the cathode (counter electrode) 12 is formed on the entire surface of the light emitting element portion 11 and plays a role of flowing a current through the functional layer 110 in a pair with the pixel electrode 111. In the present example, the cathode 12 is configured by laminating a calcium layer 12a and an aluminum layer 12b as being capable of reducing lithium (Li) ions of the metal organic compound 150. The aluminum layer 12b reflects light emitted from the organic EL layer 110b to the substrate 2 side, and an Ag film, a laminated film of Al and Ag, or the like can be employed in addition to the Al film. Moreover, the thickness can be made into the range of 100 nm-1000 nm, for example.

In the organic EL device 1 configured as described above, the transflective layer 126 forms an optical resonator with the cathode 12, that is, the light emitted from the organic EL layer 110 to the cathode 12 side is Reflected by the cathode 12, and as a result, resonated between the cathode 12 and the transflective layer 126. As a result of the resonance, the reflected light is transmitted through the semi-transmissive reflective layer 126 when the wavelength is transmitted.
On the other hand, part of the light emitted from the organic EL layer 110 to the transflective layer 126 side is transmitted through the transflective layer 126 and the other part is reflected by the transflective layer 126. As a result, Resonance occurs between the cathode 12 and the transflective layer 126. Then, as a result of resonance, when the wavelength reaches the transflective layer 126, the reflected light is transmitted therethrough.

  As described above, the light transmitted through the transflective layer 126 is emitted from the organic EL device 1 and used for display or the like. In the present embodiment, the reflected light is transmitted after the transflective layer after the resonance. 126, the color purity of the light emitted from the organic EL device 1 is improved, and when this is used as a display device, a display with high luminance and high contrast can be obtained. Has been. In the present embodiment, blue chromaticity (x, y = 0.14, 0.16), green chromaticity (x, y = 0.40, 0.59), and red chromaticity (x, y = 0.66, 0.33) could be obtained. In an organic EL device that does not include an optical resonator structure (that is, the transflective layer 126), blue chromaticity (x, y = 0.15, 0.2) and green chromaticity (x, y = 0). .42, 0.55).

  Further, in the present embodiment, the organic EL layer 110 is made of a polymer material, but blue and green have relatively low color purity compared to red, and in particular, have low blue color purity. It becomes. Therefore, as in the present embodiment, the reflectance of the transflective layer 126 is increased for the green (G) and blue (B) pixels with relatively low color purity, and red with relatively high color purity. By reducing the reflectance (in-plane occupation area) of the transflective layer 126 with respect to the pixel (R), it is possible to improve the color purity in a balanced manner for each color pixel.

In general, when an optical resonance structure is employed, although the color purity is improved, the light emission efficiency tends to be reduced. However, in this embodiment, since the reflectance (occupied area in the plane) of the transflective layer 126 is configured to be different for each pixel of a different color, light emission that can be generated by the introduction of the transflective layer 126. The reduction in efficiency can be minimized. Specifically, in the organic EL device 1 of the present embodiment, it is possible to obtain a luminance of 250 Cd / m ² during white display by all pixel driving and a light amount of 3 lm / W during light emission, while an optical resonator structure ( That is, in the organic EL device that does not include the transflective layer 126), the emission efficiency was not significantly reduced at 250 Cd / m ² and 3.51 lm / W.

  In the present embodiment, the transflective layer 126 having a relatively low reflectance (occupied area in the plane) is formed with respect to the red (R) pixel. The transmission / reflection layer 126 may not be formed. That is, the semi-transmissive reflective layer 126 may be selectively formed only on green (G) and blue (B) pixels.

  Furthermore, in order to make the reflectance of the transflective layer 126 different for each pixel, the thickness of the transflective layer 126 may be different for each pixel. Specifically, the layer thickness relationship of the transflective layer 126 may be configured so that (layer thickness of red pixel) <(layer thickness of green pixel) <(layer thickness of blue pixel). preferable.

Hereinafter, the manufacturing method of the organic EL device 1 of the first embodiment will be described.
First, a light shielding layer BM having a thickness of about 300 nm is formed on the substrate 2 by a known photolithography technique, and then a base protective film 2c and a TFT 123 are formed, and interlayer insulating films 144a and 144b are formed to form a base of the EL device. Create
Then, Al is formed on the second interlayer insulating film 144b as the semi-transmissive reflective layer 126 to a thickness of about 10 nm, and patterning is performed so that the in-plane occupation area in each pixel is designed in the above-described range.

Subsequently, ITO as a transparent anode is patterned to a thickness of about 70 nm on all the pixels, and SiO _{2 is formed} to a thickness of about 50 nm as the inorganic bank layer 112a serving as the pixel opening film, and polyimide is further formed as the organic bank layer 112b. A pattern is formed to about 2 μm.
Then, a liquid composition containing a PEDOT / PSS material was applied as a material for forming a hole injection / transport layer by an inkjet method in the formed bank, and a thickness of 50 nm was common to pixels of each color.
Further, a polymer light emitting material is formed on each color pixel by an ink jet method. The film thicknesses at this time were 80 nm for red pixels, 80 nm for green pixels, and 70 nm for blue pixels. Subsequently, the cathode 12 is formed and a sealing process is performed to obtain the organic EL device 1 of the first embodiment.

(Second Embodiment)
Next, a second embodiment of the organic EL device will be described with reference to FIG. In the organic EL device 100 of the second embodiment, in addition to the configuration of the first embodiment, a function of absorbing red on the light emitting side of the transflective layer 126 in the green (G) and blue (B) pixels. The red absorption filter 125 provided with is formed. In addition, since it is the same as that of 1st Embodiment except the point which this red absorption filter 125 is formed, description is abbreviate | omitted.

  By introducing such a red absorption filter 125, it is possible to improve color purity and reduce external light reflection, and as a result, it is possible to configure the organic EL device 100 as a display device with further excellent visibility. . In order to prevent such external light reflection, a known circularly polarizing plate may be provided on the light emitting side of the substrate 2. Further, in the second embodiment, the in-plane occupation area ratio in each pixel of the transflective layer 126 is (occupied area in red pixels) :( occupied area in green pixels) :( in blue pixels) Occupied area) = 10: 40: 50. Thereby, the reflectance ratio of the transflective layer 126 in this embodiment is (reflectance of the transflective layer of the red pixel): (reflectance of the transflective layer of the green pixel): (blue pixel) Of the semi-transmissive layer) = 10: 40: 50.

Here, the red absorption filter 125 can be formed of a resin layer made of, for example, a Sn phthalocyanine compound. In addition, as a method of selectively disposing the red absorption filter 125 with respect to the green (G) and blue (B) pixels, for example, an inkjet method or a photolithography method can be employed. Specifically, when the ink jet method is used, first, CF ₄ plasma is applied to the entire surface of the second interlayer insulating film 144b, and the green (G) and blue (B) pixels are irradiated with ultraviolet rays to modify the surface. In this case, the filter 125 can be uniformly formed.

(Third embodiment)
FIG. 5 shows an embodiment of the electronic apparatus of the present invention.
The electronic apparatus of this example includes the above-described organic EL device as display means. FIG. 5 is a perspective view showing an example of a mobile phone. Reference numeral 1000 indicates a mobile phone body, and reference numeral 1001 indicates a display unit using the organic EL device. As described above, an electronic apparatus including the organic EL device according to the electro-optical device of the present invention as a display unit can obtain good light emission characteristics and can reduce the price of the electronic apparatus.

Explanatory drawing which shows the structure of the organic electroluminescent apparatus of 1st Embodiment typically. The circuit diagram which shows the circuit structure of an active matrix type organic electroluminescent apparatus. The enlarged view which shows the cross-section of a display area | region about the organic electroluminescent apparatus of 1st Embodiment. The enlarged view which shows the cross-section of a display area | region about the organic electroluminescent apparatus of 2nd Embodiment. FIG. 14 is a perspective view showing an embodiment of an electronic apparatus according to the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100 ... Organic EL apparatus, 12 ... Cathode (light reflective electrode), 110b ... Organic EL layer (light emitting layer), 111 ... Pixel electrode (anode, light transmissive electrode), 126 ... Semi-transmissive reflective layer

Claims (4)

An optical resonator is formed between the light reflective electrode, the organic EL layer, the light transmissive electrode, and the light reflecting electrode by transmitting a part of the light emitted from the organic EL layer and reflecting a part thereof. An organic EL device comprising a plurality of pixels laminated in this order with a transflective layer to be configured,
Among the plurality of pixels, the first organic EL layer arranged in the first pixel and the second organic EL layer arranged in the second pixel emit light different from each other, and the first The emitted light of the organic EL layer has higher color purity than the emitted light of the second organic EL layer,
The area of the first of said transflective layer disposed on the first pixel, rather smaller than the area of the light emitting region of the first pixel,
The area of the second transflective layer disposed in the second pixel is smaller than the area of the light emitting region of the second pixel,
The area ratio of the first transflective layer to the area of the light emitting region of the first pixel is smaller than the area ratio of the second transflective layer to the area of the light emitting region of the second pixel. An organic EL device. The organic EL device according to claim 1 , further comprising a bank section that partitions the first organic EL layer and the second organic EL layer. The organic EL device according to claim 1 or 2, wherein the organic EL layer is characterized in that it is composed of high molecular organic EL materials. An electronic apparatus comprising the organic EL device according to any one of claims 1 to 3 .

Images