JP2008091037A - Organic electroluminescent device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic electroluminescent device capable of maintaining good display performance. <P>SOLUTION: This organic EL device is equipped with a first substrate on which a plurality of light emitting elements are provided, a second substrate which is disposed so as to face the first substrate, to which light from the light emitting element enters, and which has an emitting face to emit the entered light to the outside, a plurality of coloring parts which are provided in the second substrate, to which light from the light emitting element enters, and which is capable of transmitting the entered light, and a photosensor provided in the second substrate to detect light from the light emitting element which has permeated the coloring part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an organic electroluminescence (EL) device.

The organic EL device has a light emitting element including a light emitting layer and an anode and a cathode sandwiching the light emitting layer, and injects holes injected from the anode side and electrons injected from the cathode side in the light emitting layer. Utilizing the phenomenon of light emission when recombining and leaving the excited state, desired light is emitted. The light emitting element deteriorates with time, for example. When the light emitting element deteriorates, the display performance of the organic EL device also deteriorates. Therefore, in order to maintain the display performance of the organic EL device satisfactorily, a technology has been devised that detects the light emitting state of the light emitting element using an optical sensor and controls the light emitting state of the light emitting element based on the detection result. ing.
JP 2002-278504 A JP 2006-098638 A

  In an organic EL device, a technique for emitting light from a light emitting element to the outside of the device through a color filter is known. In the case of a device having such a configuration, depending on the position where the photosensor is arranged, there is a possibility that control for maintaining the display performance of the organic EL device cannot be performed satisfactorily based on the detection result of the photosensor. There is.

  This invention is made | formed in view of the said situation, and it aims at providing the organic electroluminescent apparatus which can maintain display performance favorably.

In order to solve the above problems, the present invention adopts the following configuration.
According to the first aspect of the present invention, the first substrate provided with a plurality of light emitting elements and the first substrate are arranged so as to face the first substrate. A second substrate having an emission surface that emits to the outside; a plurality of colored portions that are provided on the second substrate and receive light from the light-emitting element and are capable of transmitting the incident light; and the second substrate. There is provided an organic electroluminescence device provided with an optical sensor that is provided and detects light of the light emitting element that has passed through the colored portion.

  According to the first aspect of the present invention, since the light of the light emitting element that has passed through the colored portion of the color filter is detected by the optical sensor, the optical sensor is the light that is actually emitted outside the organic EL device. That is, it is possible to detect light equivalent to light that actually enters the eyes of the observer. Therefore, it is possible to take appropriate measures for maintaining good display performance based on the detection result.

  In the organic electroluminescence device of the above aspect, a configuration in which a plurality of pixels corresponding to the plurality of light emitting elements is provided, and the coloring portion and the photosensor are provided for each pixel can be adopted.

  According to this, the light for every pixel can be detected by the optical sensor, and appropriate measures for maintaining good display performance can be taken based on the detection result.

  In the organic electroluminescence device according to the aspect described above, the light sensor has a light shielding portion arranged at a boundary between a plurality of colored portions, and the light sensor is arranged at a position where irradiation of light from the outside is suppressed by the light shielding portion. Can be adopted.

  According to this, the optical sensor can satisfactorily detect the light transmitted through the colored portion of the color filter without being substantially affected by light from the outside.

  In the organic electroluminescence device of the above aspect, the light sensor has a light shielding portion arranged at a boundary between a plurality of coloring portions, and the light sensor is arranged at a position where irradiation of light from the outside is suppressed by the light shielding portion, The light shielding part may employ a configuration including at least a part of wiring connected to the optical sensor.

  According to this, the optical sensor can satisfactorily detect the light transmitted through the colored portion of the color filter without being substantially affected by light from the outside.

  In the organic electroluminescence device of the above aspect, a configuration including a control device that adjusts electric power applied to the light emitting element based on a detection result of the optical sensor can be adopted.

  According to this, the display performance of the organic EL device can be favorably maintained based on the detection result of the optical sensor.

  According to the second aspect of the present invention, a light emitting device including a first substrate, a first electrode provided on the first substrate and facing the first substrate, and a second electrode opposite to the first electrode. And arranged so as to be connected to the second electrode on the light emitting side of the light emitting element, and transmits a part of the light of the light emitting element and reflects another part, and the first electrode and the second electrode A translucent reflective film that forms an optical resonator with the electrode and a light-emitting element on the first substrate are disposed so as to face the light, and the light from the light-emitting element is incident and the incident light is exposed to the outside. There is provided an organic electroluminescence device comprising: a second substrate having an emission surface to be emitted; and an optical sensor provided on the second substrate and detecting light of the light emitting element including the optical resonator.

  According to the second aspect of the present invention, the light of the light emitting element including the minute optical resonator structure, that is, the so-called microcavity structure is detected by the optical sensor, so that the optical sensor is actually provided outside the organic EL device. Can be detected, that is, light equivalent to light that is actually incident on the eyes of the observer. Therefore, it is possible to take appropriate measures for maintaining good display performance based on the detection result.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, an XYZ orthogonal coordinate system is set, and the positional relationship of each member will be described with reference to this XYZ orthogonal coordinate system. The predetermined direction in the horizontal plane is the X-axis direction, the direction orthogonal to the X-axis direction in the horizontal plane is the Y-axis direction, and the direction orthogonal to each of the X-axis direction and the Y-axis direction (that is, the vertical direction) is the Z-axis direction. To do. Further, the rotation directions around the X axis, the Y axis, and the Z axis are the θX, θY, and θZ directions, respectively.

<First Embodiment>
A first embodiment will be described. FIG. 1 is a side sectional view schematically showing an example of the organic EL device S according to the first embodiment.

  In FIG. 1, an organic EL device S is disposed so as to face the TFT array substrate 2 provided with a plurality of light emitting elements 1 and the TFT array substrate 2, and the light from the light emitting elements 1 is incident thereon. And a color filter substrate (sealing substrate) 5 including a color filter 4 having an emission surface 3 for emitting light to the outside. The TFT array substrate 2 includes circuit elements such as thin film transistors (TFTs). The color filter 4 receives light from the light emitting element 1 provided on the TFT array substrate 2 and transmits a plurality of colored portions 4R, 4G, and 4B that can transmit the incident light, and a plurality of colored portions 4R, 4G, And a light shielding part BM arranged at the boundary of 4B.

  The colored part includes a red colored part (R colored part) 4R, a green colored part (G colored part) 4G, and a blue colored part (B colored part) 4B. The light-shielding part BM is arranged at the boundary of the R coloring part 4R, the G coloring part 4G, and the B coloring part 4B, and has a function of suppressing light leakage between pixels, a function of improving contrast, and the like. Matrix.

  In the present embodiment, the light emitting element 1 emits white light. When the white light of the light emitting element 1 passes through the color filter 4, light colored in red, green, and blue is emitted from the emission surface 3. Thereby, the organic EL device S can perform full color display.

  The organic EL device S according to the present embodiment includes an optical sensor 6 that is provided on the color filter substrate 5 and detects the light of the light emitting element 1 that has passed through the colored portions 4R, 4G, and 4B of the color filter 4.

  The organic EL device S includes a plurality of pixels (including sub-pixels) corresponding to the plurality of light emitting elements 1, and the coloring portions 4R, 4G, and 4B and the optical sensor 6 are provided for each pixel. Moreover, the optical sensor 6 is arrange | positioned in the position where irradiation of the light from the outside was suppressed by the light-shielding part BM. In the present embodiment, the optical sensor 6 is disposed between the light shielding part BM and the coloring parts 4R, 4G, 4B.

  In addition, the organic EL device S includes a control device 7 that adjusts the power applied to each light emitting element 1 based on the detection result of each photosensor 6.

  The organic EL device S of the present embodiment is a so-called top emission type in which light from the light emitting element 1 is extracted from the color filter substrate 5 side.

  FIG. 2 is a schematic diagram showing a wiring structure of the organic EL device S according to the present embodiment. The organic EL device S of the present embodiment employs an active matrix driving method and includes a thin film transistor (TFT) as a switching element.

  In FIG. 2, the organic EL device S extends in the X-axis direction and extends in the Y-axis direction with a plurality of scanning lines (gate lines) 101 formed on the TFT array substrate 2 so as to be aligned in the Y-axis direction. A plurality of signal lines (source lines, data lines) 102 formed on the TFT array substrate 2 so as to be aligned in the direction, and a plurality of power supply lines 103 formed on the TFT array substrate 2 so as to be parallel to each signal line 102. And have. A pixel area GA in which pixels are formed is provided in the vicinity of each intersection of the plurality of scanning lines 101 and the plurality of signal lines 102.

  Each of the scanning lines 101 is connected to the scanning line driving circuit 80. The scanning line driving circuit 80 includes a shift register, a level shifter, and the like. Each of the signal lines 102 is connected to a signal line driving circuit 81. The signal line driver circuit 81 includes a shift register, a level shifter, a video line, an analog switch, and the like.

    The organic EL device S is disposed in each of the pixel areas GA, and is a switching TFT 31 that switches to an ON state (conductive state) or an OFF state (non-conductive state) based on a scanning signal (voltage) applied from the scanning line 101. When the switching TFT 31 is in the ON state, an image signal (voltage) is applied from the signal line 102 via the switching TFT 31, and the holding capacitor 32 that can hold the image signal (voltage) and the holding capacitor 32 A driving TFT 33 that switches to an ON state (conducting state) or an OFF state (non-conducting state) based on an applied image signal (voltage), and a power source via the driving TFT 33 when the driving TFT 33 is in an ON state. A driving current is supplied from the line 103, and the light emitting element 1 emits light based on the driving current. The light emitting element 1 includes a pixel electrode 23, a common electrode 25, and a light emitting layer 24 sandwiched between the pixel electrode 23 and the common electrode 25.

  The gate electrode of the switching TFT 31 is connected to the scanning line 101. When a scanning signal is supplied from the scanning line 101 to the gate electrode of the switching TFT 31, the switching TFT 31 is turned on based on the scanning signal. The scanning line driving circuit 80 sequentially applies a pulsed scanning signal to each of the plurality of scanning lines 101. As a result, a scanning signal is sequentially applied to each of the gate electrodes of the plurality of switching TFTs 31, and the plurality of switching TFTs 31 are sequentially turned on.

  The source electrode of the switching TFT 31 is connected to the signal line 102, and the drain electrode of the switching TFT 31 is connected to the storage capacitor 32. When an image signal (voltage) is applied from the signal line 102 to the source electrode of the switching TFT 31 when the switching TFT 31 is in the ON state, the storage capacitor 32 is passed through the switching TFT 31 (the drain electrode of the switching TFT 31). Is charged. The holding capacitor 32 holds the image signal (potential) of the signal line 102 at that time, and the holding capacitor 32 holds the applied image signal (voltage).

  The gate electrode of the driving TFT 33 is connected to the storage capacitor 32. The state of the driving TFT 33 (either the ON state or the OFF state) is determined according to the state of the storage capacitor 32. When the image signal (voltage) held in the holding capacitor 32 is applied from the holding capacitor 32 to the gate electrode of the driving TFT 33, the driving TFT 33 is turned on based on the image signal.

  The source electrode of the driving TFT 33 is connected to the power supply line 103, and the drain electrode of the driving TFT 33 is connected to the pixel electrode 23 of the light emitting element 1. When a driving current is supplied from the power supply line 103 to the source electrode of the driving TFT 33 when the driving TFT 33 is in the ON state, the driving current is emitted through the driving TFT 33 (the drain electrode of the driving TFT 33). It is supplied to the pixel electrode 23 of the element 1. The current supplied to the pixel electrode 23 of the light emitting element 1 flows to the common electrode 25 through the light emitting layer 24. The light emitting layer 24 emits light according to the amount of current flowing. Thus, the light emitting element 1 emits light according to the supplied current, and the light amount (luminance) of the light emitted from the light emitting element 1 changes according to the supplied current value. The control device 7 can adjust the light amount (luminance) of the light emitted from the light emitting element 1 by adjusting the current value supplied to the light emitting element 1.

  The current value supplied to the light emitting element 1 (the amount of light emitted from the light emitting element 1) can be controlled by the voltage value applied from the storage capacitor 32 to the driving TFT 33 (the gate electrode of the driving TFT 33). Further, since the holding capacitor 32 can hold (maintain) the image signal (voltage), the application of the scanning signal (voltage) from the scanning line 101 to the switching TFT 31 (gate electrode of the switching TFT 31) is stopped, and switching is performed. Even when the TFT 31 is turned off, the voltage (potential) of the driving TFT 33 (the gate electrode of the driving TFT 33) is maintained by the storage capacitor 32, and the light emitting element 1 can continue to emit light.

  FIG. 3 is a plan view schematically showing the organic EL device S. As shown in FIG. 3, the organic EL device S according to the present embodiment includes a TFT array substrate 2 provided with circuit elements including various wirings, TFTs, and the like, and a color filter substrate 5 including a color filter 4. Yes. In the present embodiment, the organic EL device S has a display area 50 disposed on the emission surface 3 side of the color filter substrate 5. In the present embodiment, the display area 50 includes an actual display area 51 and a dummy area 52 arranged around the actual display area 51.

  In the actual display area 51, colored portions 4R, 4G, and 4B through which light from the light emitting elements 1 in the pixel electrodes 23 and the respective pixel areas GA are transmitted are arranged in a matrix. The white light of the light emitting element 1 passes through the colored portions 4R, 4G, and 4B, and is emitted from the emission surface 3 as red, green, and blue light. Further, scanning line drive circuits 80 and 80 and an inspection circuit 82 are arranged in the dummy region 52. The inspection circuit 82 is a circuit for inspecting the operation state of the organic EL device S. For example, the inspection circuit 82 includes an inspection information output device (not shown) that outputs the inspection result to the outside, and is an organic EL device during manufacture or at the time of shipment. The quality and defect inspection of the device S can be performed.

  FIG. 4 is a cross-sectional view of the organic EL device S according to the present embodiment. In FIG. 4, the organic EL device S includes a TFT array substrate 2 including a thin film transistor (TFT), and a light emitting element 1 provided on the TFT array substrate 2.

  The TFT array substrate 2 includes a substrate 20, circuit elements including a scanning line 101, a signal line 102, a power supply line 103, a switching TFT 31, a driving TFT 33, and the like provided on the substrate 20, an interlayer insulating film 21, and the like. Have The substrate 20 is made of glass, transparent resin, or the like, and is a transparent substrate.

  As described above, since the organic EL device S of the present embodiment is a top emission type, the substrate 20 may be an opaque substrate formed of metal, opaque resin, or the like.

The interlayer insulating film 21 is formed of, for example, silicon oxide (SiO ₂ ), and circuit elements such as a scanning line 101, a signal line 102, a power supply line 103, a switching TFT 31, and a driving TFT 33 provided on the substrate 20. Covering. The interlayer insulating film 21 may be formed of silicon nitride (SiN), silicon oxynitride film (SiON), or the like.

  The light emitting element 1 includes a pixel electrode 23 formed on the interlayer insulating film 21, a light emitting layer 24 disposed on the pixel electrode 23, and a common electrode 25 disposed on the light emitting layer 24.

    The pixel electrode 23 is formed so as to correspond to each of the driving TFTs 33. In the present embodiment, the pixel electrode 23 is formed on the reflective film 23A having a function of reflecting light, such as an aluminum film, and on the reflective film 23A, and transmits light such as an indium tin oxide (ITO) film. And a transparent film 23B having the function of The pixel electrode 23 may be formed of only one of the reflective film 23A and the transparent film 23B. The pixel electrode 23 is electrically connected to the driving TFT 33 via a plug (not shown) in a contact hole formed in the interlayer insulating film 21.

    On the interlayer insulating film 21, a partition wall 22 that partitions the pixel region GA is formed. The partition wall 22 is formed to cover the upper surface of the interlayer insulating film 21 between the pixel electrodes 23 and 23 adjacent to each other and to cover the peripheral region of the upper surface of each pixel electrode 23. A central region on the upper surface of the pixel electrode 23 is exposed from the opening 22 </ b> A of the partition wall 22. The partition wall 22 is formed of an insulating organic material such as an acrylic resin or a polyimide resin.

    The light emitting layer 24 is formed so as to cover the central region of the upper surface of the pixel electrode 23 exposed from the opening 22 </ b> A and the upper surface of the partition wall 22. The light emitting layer 24 includes a hole transport layer formed so as to be connected to the upper surface of the pixel electrode 23, a hole injection layer formed on the hole transport layer, and an organic EL formed on the hole injection layer. A layer, an electron injection layer formed on the organic EL layer, and an electron transport layer formed on the electron injection layer. Each of these layers can be formed by a vapor deposition method such as a vapor deposition method. Note that the layer configuration of the light emitting layer 24 can be appropriately changed as necessary. For example, the organic EL layer may be formed of a plurality of layers.

    The hole transport layer and the hole injection layer are, for example, disclosed in JP-A-63-70257, JP-A-63-175860, JP-A-2-135359, JP-A-2-135361, Triphenylamine derivatives (TPD), pyrazoline derivatives, arylamine derivatives, stilbene derivatives, as described in Kaihei 2-20988, JP-A-3-37992, JP-A-3-152184, etc. It can be formed with a triphenyldiamine derivative, a triphenyldiamine derivative, 4,4′-bis (N (3-methylphenyl) -N-phenylamino) biphenyl, or the like.

    The organic EL layer can be formed of a low molecular weight organic light emitting dye, a polymer light emitter, that is, a light emitting material such as various fluorescent materials or phosphorescent materials, or an organic electroluminescent material such as Alq3 (aluminum chelate complex). Among the conjugated polymers that serve as the light-emitting substance, those containing an arylene vinylene or polyfluorene structure are particularly preferable. In the low-molecular light emitters, for example, naphthalene derivatives, anthracene derivatives, perylene derivatives, polymethine-based, xanthene-based, coumarin-based, cyanine-based pigments, 8-hydroquinoline and its metal complexes, aromatic amines, tetraphenylcyclo Examples thereof include pentadiene derivatives and the like, or materials disclosed in JP-A-57-51781 and JP-A-59-194393.

    As described above, in the present embodiment, the light emitting layer 24 including the organic EL layer emits white light. Therefore, a material for forming the organic EL layer is appropriately selected so that light emitted from the organic EL layer becomes white. Since white light is light obtained by combining a plurality of lights having different peak wavelengths, for example, a material capable of emitting red light, a material capable of emitting green light, and a material capable of emitting blue light are synthesized. Thus, a material for forming an organic EL layer capable of emitting white light can be formed.

    The electron injection layer and the electron transport layer are, for example, JP-A-63-70257, JP-A-63-175860, JP-A-2-135359, JP-A-2-135361, JP-A-2-209998. Oxadiazole derivatives, anthraquinodimethane and its derivatives, benzoquinone and its derivatives, naphthoquinone and its derivatives, as disclosed in Japanese Patent Application Laid-Open No. 3-37992 and Japanese Patent Application Laid-Open No. 3-152184 , Anthraquinone and derivatives thereof, tetracyanoanthraquinodimethane and derivatives thereof, fluorenone derivatives, diphenyldicyanoethylene and derivatives thereof, diphenoquinone derivatives, metal complexes of 8-hydroxyquinoline and derivatives thereof, 2- (4-biphenylyl) -5 (4-t-butylphenyl -1,3,4-oxadiazole, benzoquinone, anthraquinone, can be formed with tris (8-quinolinol) aluminum and the like.

    The common electrode 25 is formed so as to cover the light emitting layer 24. The common electrode 25 is formed of a transparent film having a function of transmitting light, such as a MgAg or ITO film. The common electrode 25 can be formed by, for example, vapor deposition. As described above, since the organic EL device S of the present embodiment is a top emission type, the common electrode 25 is formed of a film having sufficient transparency.

    On the common cathode 25, a passivation film 26 having a function of transmitting light, such as a film of SiON or the like, is formed. The passivation film 26 is formed so as to cover the common electrode 25. The passivation film 26 has a function of suppressing moisture, oxygen, and the like from entering the light emitting layer 24 from the outside.

  The color filter substrate 5 includes a substrate 30 and a color filter 4 provided on the substrate 30. The substrate 30 is made of glass, transparent resin, or the like, and is a transparent substrate. The color filter substrate 5 is connected to the passivation film 26 via a transparent adhesive layer 27. The adhesive layer 27 is formed of a thermosetting resin or an ultraviolet irradiation curable resin, and can be formed of, for example, an epoxy resin or an acrylic resin.

  The color filter 4 includes colored portions 4R, 4G, and 4B disposed so as to face the adhesive layer 27, and a light-shielding portion (black matrix) BM disposed at the boundary between the colored portions 4R, 4G, and 4B.

  The light shielding portion BM is disposed between the pixel areas GA in a plane (in the XY plane) parallel to the surface of the substrate 30 (including the emission surface 3). In FIG. 4, the light shielding part BM is arranged immediately above the partition wall 22. The light shielding portion BM is formed of a film having a function of shielding light, such as a chromium (Cr) film. The light shielding part BM is formed in a lattice shape. A region surrounded by the light shielding unit BM corresponds to each of the pixel regions GA.

  The color filter 4 is disposed at a position corresponding to each of the pixel areas GA, that is, almost immediately above the pixel area GA (pixel electrode 23) in FIG. White light emitted from the light emitting layer 24 is colored by passing through the colored portions 4R, 4G, and 4B of the color filter 4, and has a wavelength of red (R), green (G), or blue (B). The light exits from the exit surface 3 as light having a peak in the region.

  The colored portions 4R, 4G, and 4B are disposed so as to face the light emitting element 1. That is, the surface (lower surface) of the color filter 4 facing the light emitting element 1 is formed by the lower surfaces of the colored portions 4R, 4G, and 4B. On the other hand, the light shielding part BM is arranged so as to face the substrate 30 on the opposite side to the light emitting element 1. That is, a part of the surface (upper surface) of the color filter 4 facing the substrate 30 is formed on the upper surface of the light shielding portion BM.

  And the optical sensor 6 is arrange | positioned in the position where irradiation of the light (light from the output surface 3) from the exterior of the apparatus was suppressed by the light-shielding part BM. Specifically, the optical sensor 6 is disposed between the light shielding portion BM disposed on the upper surface side of the color filter 4 and the coloring portions 4R, 4G, and 4B disposed on the lower surface side. Thereby, the optical sensor 6 can detect only the light of the light emitting element 1 that has passed through the colored portions 4R, 4G, and 4B while being suppressed from being irradiated with light from the outside by the light shielding portion BM. The optical sensor 6 is provided for each pixel area GA.

  FIG. 5 is a schematic diagram illustrating an example of the optical sensor 6. The optical sensor 6 is provided on the color filter substrate 5 and detects the light of the light emitting element 1 that has passed through the colored portions 4R, 4G, and 4B. The optical sensor 6 includes a light receiving element that can output an electrical signal (current) by receiving light, such as a photodiode or a phototransistor.

  In the present embodiment, the optical sensor 6 has a configuration equivalent to a TFT. In FIG. 5, the optical sensor 6 is formed on the insulating base 61 formed on a part of the light shielding portion BM and on the insulating base 61 (the lower surface of the base 61 in FIG. 5). A gate electrode 62; a gate insulating film 63 covering the gate electrode 62; an amorphous silicon film 64 arranged to face the gate electrode 62 with the gate insulating film 63 interposed therebetween; and an n formed on the amorphous silicon film 64 A type amorphous silicon film 65, a source electrode 66, a drain electrode 67, and amorphous silicon films 64 and 65, a source electrode 66, and an insulating film 68 covering the drain electrode 67.

In the present embodiment, the gate electrode 62 is formed of a material having a function of blocking light, such as molybdenum (Mo). The gate insulating film 63 is made of, for example, SiO ₂ . The source electrode 66 and the drain electrode 67 are made of, for example, aluminum (Al). The insulating film 68 is made of, for example, a silicon nitride film (SiNx).

  As described above, in the present embodiment, light emitted from the light emitting element 1 and transmitted through the colored portions 4R, 4G, and 4B of the color filter 4 is incident on the optical sensor 6. The optical sensor 6 outputs an electrical signal (current) corresponding to the amount of received light (amount of received light).

  In the present embodiment, a gate electrode 62 having a function of blocking light is disposed at a position facing the amorphous silicon films 64 and 65. Therefore, the light sensor 6 (amorphous silicon film) is suppressed from being irradiated with light from the outside by the light shielding portion BM and the gate electrode 62. In particular, by making the size of the gate electrode 62 in the XY plane parallel to the surface (emission surface 3) of the substrate 30 larger than that of the amorphous silicon films 64 and 65, light from the outside is irradiated onto the amorphous silicon film. This can be suppressed.

  Thus, the gate electrode 62 that forms a part of the wiring connected to the optical sensor 6 can prevent the external light from being applied to the optical sensor 6. Alternatively, by using a part of the bias line 73, a part of the scanning line 71, and the like, it is possible to suppress the external light from being applied to the optical sensor 6.

  FIG. 6 is a schematic diagram illustrating an example of a wiring structure for reading the outputs of the plurality of optical sensors 6. In FIG. 6, as an example, a plurality (three) of optical sensors 6 that detect the light of the light emitting element 1 that has passed through the colored portions 4R, 4G, and 4B are shown.

  In the present embodiment, the organic EL device S includes a switching TFT 70 connected to each photosensor 6. The optical sensor 6 is connected to the source electrode of the switching TFT 70. The gate electrode of the switching TFT 70 is connected to the scanning line 71 formed on the color filter substrate 2, and the drain electrode of the switching TFT 70 is connected to the readout line 72 formed on the color filter substrate 2. Yes.

  When the light is applied to the optical sensor 6, a scanning signal (voltage) is applied to the gate electrode of the switching TFT 70 by the scanning line 71, and the switching TFT 70 is turned on. An electrical signal is output to the readout line 72 via the TFT 70. The readout line 72 is connected to the control device 7, and the electrical signal of the optical sensor 6 is output to the control device 7. Since the optical sensor 6 outputs an electrical signal corresponding to the amount of received light, the control device 7 can determine the amount of received light received by the optical sensor 6 based on the electrical signal output from the optical sensor 6. Further, since the amount of light emitted from the light emitting element 1 and transmitted through the colored portions 4R, 4G, and 4B and the amount of light received by the optical sensor 6 are in a correspondence relationship, the control device 7 is output from Mitsuna 6 Based on the electrical signal, the amount of light of the light emitting element 1 that has passed through the colored portions 4R, 4G, and 4B can be obtained. Moreover, the optical sensor 6 is provided for every pixel, and the control apparatus 7 can detect the electric signal (the light quantity of the light which permeate | transmitted the coloring part for every pixel) of the optical sensor 6 for every pixel.

  FIG. 7 is a schematic diagram illustrating a wiring structure connected to the optical sensor 6 according to the present embodiment, and FIG. 8 is a block diagram illustrating an electrical configuration of the organic EL device S according to the present embodiment.

  7 and 8, the organic EL device S includes a plurality of scanning lines (gate lines) 71 formed on the color filter substrate 5 so as to extend in the X-axis direction and line up in the Y-axis direction, and each scanning line 71. A plurality of bias lines 73 formed on the color filter substrate 5 so as to be parallel to each other and a plurality of readout lines 72 formed on the color filter substrate 5 so as to extend in the Y-axis direction and line up in the X-axis direction. Yes. The scanning line 71 of the color filter substrate 5 is formed so as to correspond to the scanning line 101 of the TFT array substrate 2. Similarly, the readout line 72 of the color filter substrate 5 is formed so as to correspond to the signal line 102 of the TFT array substrate 2.

  As shown in FIG. 8, each scanning line 71 is connected to a scanning line driving circuit 83. Each of the read lines 72 is connected to a read line drive circuit 84. The optical sensor 6 including the TFT is provided in the vicinity of each intersection of the plurality of scanning lines 71 and the plurality of readout lines 72. In FIG. 8, the illustration of the bias line 73 is omitted.

    As shown in FIG. 7, the organic EL device S is in an ON state (conducting state) or an OFF state (non-conducting state) based on the optical sensor 6 made of TFT and a scanning signal (voltage) applied from the scanning line 71. And a switching TFT 70 that switches to.

    The gate electrode of the optical sensor 6 is connected to a bias line 73 that can apply a negative bias to the gate electrode. The drain electrode of the optical sensor 6 is connected to the source electrode of the switching TFT 70. The source electrode of the optical sensor 6 is connected to the scanning line 71 adjacent to the bias line 73.

  The photosensor 6 made of TFT is switched to an ON state or an OFF state based on the state of the bias line 73, specifically, based on a negative bias (negative voltage) applied from the bias line 73. When a negative bias (negative voltage) is applied to the gate electrode of the optical sensor 6 from the bias line 73, the optical sensor 6 is turned on based on the negative bias.

    When the optical sensor 6 (TFT) is turned on based on the state of the bias line 73 while the optical sensor 6 is irradiated with light, the optical sensor 6 outputs an electrical signal to the switching TFT 70. When a scanning signal (voltage) is applied from the scanning line 71 to the gate electrode of the switching TFT 70 based on the state of the scanning line 71 and the switching TFT 70 is turned on, the optical sensor 6 supplies the source electrode of the switching TFT 70. The supplied electric signal is supplied to the drain electrode of the switching TFT 70. The drain electrode of the switching TFT 70 is connected to the readout line 72, and the electrical signal of the optical sensor 6 is output to the readout line 72. That is, the electric signal supplied from the optical sensor 6 to the switching TFT 70 is output to the readout line 72 via the switching TFT 70 in the ON state. The electrical signal of the optical sensor 6 output to the readout line 72 is output to the control device 7 via the readout line drive circuit 84.

  The optical sensor 6 outputs an electrical signal corresponding to the amount of received light. Based on the electrical signal output from the optical sensor 6, the control device 7 obtains the amount of light received by the optical sensor 6, that is, the amount of light emitted from the light emitting element 1 and transmitted through the colored portions 4R, 4G, and 4B. Can do. Moreover, the optical sensor 6 is provided for every pixel, and the control apparatus 7 can detect the electric signal (the light quantity of the light which permeate | transmitted the coloring part for every pixel) of the optical sensor 6 for every pixel.

  In the present embodiment, scanning of the scanning line 101 of the TFT array substrate 2 and scanning of the scanning line 71 of the color filter substrate 5 are executed in synchronization. In other words, in synchronization with the timing at which a pulsed scanning signal is applied to each of the plurality of scanning lines 101 of the TFT array substrate 2, the plurality of scanning lines 71 of the color filter substrate 5 corresponding to the scanning line 101 is detected. A pulsed scanning signal is applied to each. Thereby, in synchronization with the light emitting operation of the light emitting element 1 on the TFT array substrate 2, the light receiving operation of the photosensor 6 arranged so as to correspond to the light emitting element 1 is executed.

  As shown in FIG. 8, the control device 7 of this embodiment controls the drive circuits 80 and 81 of the TFT array substrate 2 and also controls the drive circuit 83 and 84 of the color filter substrate 5, An image processing unit 92 that outputs an image signal for displaying an image in the EL device S to the drive circuit 81 of the TFT array substrate 2, a storage unit 93 that stores various information related to image display, and an optical sensor of the color filter substrate 5 6, and a signal processing unit 94 that outputs an electrical signal from the read line drive circuit 84.

  The control unit 91 outputs a control signal for controlling the drive circuits 80 and 81 of the TFT array substrate 2 to the drive circuits 80 and 81. The control unit 91 functions as a timing signal generation device, and generates various timing signals, clock signals, and the like according to control signals such as a vertical scanning signal, a horizontal scanning signal, a dot clock signal, and a clock signal supplied from an external device. And output to the drive circuits 80 and 81 of the TFT array substrate 2.

  Further, the control unit 91 outputs a control signal for controlling the drive circuits 83 and 84 of the color filter array substrate 2 to the drive circuits 83 and 84. In the present embodiment, the control unit 91 performs driving circuits 80 and 83 so that the scanning of the scanning line 101 of the TFT array substrate 2 and the scanning of the scanning line 71 of the color filter substrate 5 are executed in synchronization. To control.

  The image processing unit 92 corrects the image signal input from the external device so that the organic EL device S can display a desired image, and outputs the corrected image signal to the drive circuit 81 of the TFT array substrate 2. To do. In the present embodiment, the storage unit 93 stores the relationship between the wavelength of light incident on the optical sensor 6 and the sensitivity of the optical sensor 6 corresponding to the wavelength of the light. The image processing unit 92 refers to the storage information in the storage unit 93 and corrects the image signal input from the external device to an image signal from which a desired image is obtained.

  Next, an example of the operation of the organic EL device S according to this embodiment will be described. The control device 7 causes each of the drive circuits 80 and 81 of the TFT array substrate 2 to output a control signal from the control unit 91, and outputs an image signal to the drive circuit 81 of the TFT array substrate 2 from the image processing unit 92. Output. The drive circuits 80 and 81 send scanning signals to the TFTs 31 and 33 via the scanning lines 101 and signal lines 102 based on the control signals and image signals supplied from the control unit 91 and the image processing unit 92, respectively. Supply image signals. A current based on the supplied image signal flows through the light emitting element 1 of each pixel, and the light emitting element 1 of each pixel emits light of a light amount (luminance) corresponding to the current value.

  In the present embodiment, the control device 7 synchronizes with each of the plurality of scanning lines 71 of the color filter substrate 5 in synchronization with the timing of applying a pulsed scanning signal to each of the plurality of scanning lines 101 of the TFT array substrate 2. A pulsed scanning signal is applied to the. Thereby, the plurality of photosensors 6 arranged on the color filter substrate 5 so as to correspond to the light emitting element 1 of each pixel are synchronized with the light emitting operation of the light emitting element 1 on the TFT array substrate 2. Receives light from. Each optical sensor 6 outputs an electrical signal corresponding to the amount of received light to the readout line 72 via the switching TFT 70. The electrical signal of the optical sensor 6 output to the readout line 72 is output to the signal processing unit 94 via the drive circuit 84.

  In the present embodiment, the signal processing unit 94 holds an electrical signal of the optical sensor 6 for each frame, that is, for each scanning of the plurality of scanning lines 71. The signal processing unit 94 processes the electrical signal of the optical sensor 6 and then outputs it to the image processing unit 92.

  Based on the detection result of each optical sensor 6 supplied from the signal processing unit 94, the image processing unit 92 converts the light of the light emitting element 1 that has passed through the coloring units 4R, 4B, and 4G of each pixel to a desired light amount (luminance). ). Then, based on the detection result of each optical sensor 6, the image processing unit 92 causes the light of the light emitting element 1 that has passed through the coloring portions 4R, 4B, and 4G of each pixel to have a desired light amount (luminance). The image signal input from the external device is corrected as necessary, and the corrected image signal is output. For example, when the light of the light emitting element 1 that has passed through the coloring portion 4R of a certain pixel does not have a desired light amount (luminance), the light flows to the light emitting element 1 of the pixel so as to have a desired light amount (luminance). The image signal is corrected so that the current value becomes the optimum value. For example, when the light of the light emitting element 1 that has passed through the coloring portion 4R of a certain pixel has a light amount lower than the target light amount, the value of the current flowing through the light emitting element 1 of the pixel is increased so that the desired light amount is obtained. Then, the image signal is corrected.

  In the storage unit 93, the relationship between the current value that flows through the light emitting element 1 (and thus the correction amount of the image signal for obtaining the current value) and the amount of light emitted from the light emitting element 1 obtained through the coloring unit. Is stored in advance. The storage unit 93 stores a relationship between the wavelength of light incident on the optical sensor 6 and the sensitivity of the optical sensor 6 corresponding to the wavelength of the light. The image processing unit 92 of the control device 7 determines a current value (image signal) to be passed through the light emitting element 1 for obtaining a desired light amount based on the detection result of the optical sensor 6 and the stored information of the storage unit 93. .

  Then, the image processing unit 92 of the control device 7 outputs the determined corrected image signal to the drive circuits 80 and 81 of the TFT array substrate 2.

  As described above, according to the present embodiment, the light sensor 6 detects the light of the light emitting element 1 that has passed through the plurality of colored portions 4R, 4G, and 4B of the color filter 4. The light actually emitted to the outside of the organic EL device S, that is, the light equivalent to the light that actually enters the eyes of the observer can be detected. Therefore, it is possible to take an appropriate measure for maintaining the display performance of the organic EL device S satisfactorily based on the detection result.

  And since the control apparatus 7 can adjust the electric power (current which flows into the light emitting element 1) given to the light emitting element 1 based on the detection result of the optical sensor 6, it can maintain the display performance of the organic EL apparatus S favorably. it can. Even when the light-emitting element 1 deteriorates with time, for example, when the amount of light decreases, the light-emitting element 1 emits a desired light by adjusting the current flowing through the light-emitting element 1 based on the detection result of the optical sensor 6. The organic EL device S can display an image with a desired light amount by using the light emitting element 1. Further, since the organic EL device S can correct the change with time of the amount of light emitted from the light emitting element 1, it can faithfully reproduce the input image and maintain the reproducibility for a long period of time.

  In addition, since the optical sensor 6 is provided for each pixel, the control device 7 can adjust the amount of light for each pixel, and can correct unevenness in light amount, uneven color, and the like, for example.

  Since the optical sensor 6 (amorphous silicon films 64 and 65) is disposed at a position where the light irradiation from the outside is suppressed by the light shielding portion BM, the gate electrode 62, and the like, the influence of the light from the outside is affected. The light emitted from the light emitting element 1 and transmitted through the colored portions 4R, 4G, 4B of the color filter 4 can be detected satisfactorily without being received. Therefore, the control device 7 controls the current flowing through the light emitting element 1 based on the detection result of the optical sensor 6, and the light emitting element 1 through the coloring portions 4R, 4G, and 4B having a light amount substantially equal to the target value. Can get the light.

  In the present embodiment, the TFTs 31 and 33 of the TFT array substrate 2 and the TFTs 6 and 70 of the color filter substrate 5 can be formed separately. Therefore, the TFTs 6 and 70 of the color filter substrate 5 can include amorphous silicon, and the TFTs 31 and 33 of the TFT array substrate 2 can include polysilicon, so that each TFT can be manufactured in a desired form.

<Second Embodiment>
Next, a second embodiment will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  FIG. 9 is a side sectional view schematically showing an example of the organic EL device S according to the second embodiment. In the present embodiment, the organic EL device S includes a plurality of light emitting elements 1 that emit light of different colors. In the present embodiment, the organic EL device S includes a light emitting element 1R that emits red light, a light emitting element 1G that emits green light, and a light emitting element 1B that emits blue light. Further, the colored portions 4R, 4G, and 4B are arranged so as to correspond to the light emitting elements 1R, 1G, and 1B, respectively. That is, after the red light emitted from the light emitting element 1R is transmitted through the R colored portion 4R and then emitted from the emission surface 3, the red light emitted from the light emitting element 1G is transmitted through the G colored portion 4G. The red light emitted from the emission surface 3 and emitted from the light emitting element 1B is emitted from the emission surface 3 after passing through the B coloring portion 4B. By doing so, the color purity emitted from the emission surface 3 can be improved, and the organic EL device S can display an image having a high contrast.

  Also in the present embodiment, the optical sensor 6 is provided for each pixel, and the control device 7 can emit light having a desired light amount from the emission surface 3 based on the detection result of the optical sensor 6.

<Third Embodiment>
Next, a third embodiment will be described. In the following description, the same or equivalent components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  FIG. 10 is a side sectional view schematically showing an example of the organic EL device S according to the third embodiment. The organic EL device S of the third embodiment includes a TFT array substrate 2, a pixel electrode 23 provided on the TFT array substrate 2 and facing the TFT array substrate 2, and a common electrode 25 opposite to the pixel electrode 23. The light-emitting elements 1R, 1G, and 1B are arranged so as to be connected to the common electrode 25 on the light emission side of the light-emitting elements 1R, 1G, and 1B. A translucent reflective film 29 that partially reflects and forms an optical resonator between the pixel electrode 23 and the common electrode 25, and the light emitting elements 1R, 1G, and 1B on the TFT array substrate 2 are arranged to face each other. The light emitting elements 1R, 1G, and 1B are incident, the second substrate 5 having an emission surface 3 that emits the incident light to the outside, and the light emitting element that is provided on the second substrate 5 and includes an optical resonator Detect 1R, 1G, 1B light And an optical sensor 6.

That is, the organic EL device S of the present embodiment includes light emitting elements 1R, 1G, and 1B including a minute optical resonator structure, so-called microcavity structure, as disclosed in, for example, Japanese Patent Laid-Open No. 7-282981. . In the present embodiment, the translucent reflective film 29 is, for example, a laminate of a TiO ₂ film and a SiO ₂ film. The pixel electrode 23 includes a film formed of a material that can reflect light, such as aluminum. The common electrode 25 is made of a transparent material such as MgAg or ITO.

  In the present embodiment, the peak wavelength of the emission spectrum of each light emitting element 1R, 1G, 1B and the light emitting layer (organic layer) 24R between the pixel electrode 23 and the common electrode 25 of each light emitting element 1R, 1G, 1B, The film thicknesses of the light emitting layers 24R, 24G, and 24B are set so that the optical path lengths in 24G and 24B match. Therefore, as shown in FIG. 10, the film thicknesses of the light emitting layers 24R, 24G, and 24B of the light emitting elements 1R, 1G, and 1B are different from each other. Each of the light emitting elements 1R, 1B, and 1G having a microcavity structure can emit light having a desired emission spectrum.

  In the third embodiment, as in the second embodiment described above, the colored portions 4R, 4G, and 4B are arranged so as to correspond to the light emitting elements 1R, 1G, and 1B, respectively. Thereby, light of high color purity is emitted from the emission surface 3.

  Also in the present embodiment, the optical sensor 6 is provided for each pixel, and the control device 7 can emit light having a desired light amount from the emission surface 3 based on the detection result of the optical sensor 6.

  In the third embodiment, the color filter 4 (colored portions 4R, 4G, 4B) may be omitted. Since each of the light emitting elements 1R, 1B, and 1G having the microcavity structure can emit light having a desired emission spectrum, even if the color filter 4 (colored portions 4R, 4G, and 4B) is omitted, the light emitting elements 1R, 1B, and 1G can emit light from the emission surface 3. Can emit light with high color purity.

<Fourth embodiment>
Next, a fourth embodiment will be described. FIGS. 11A to 11C are diagrams illustrating an example of an electronic device on which the organic EL device S described in the first to third embodiments is mounted.

  FIG. 11A is a perspective view illustrating an example of a mobile phone. In FIG. 11A, reference numeral 500 denotes a mobile phone body, and reference numeral 501 denotes a display portion provided with an organic EL device.

  FIG. 11B is a perspective view illustrating an example of a portable information processing device 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 body, and reference numeral 602 denotes a display unit including an organic EL device.

  FIG. 11C is a perspective view illustrating an example of a wristwatch-type electronic device. In FIG. 11C, reference numeral 700 denotes a watch body, and reference numeral 701 denotes a display portion provided with an organic EL device.

  Since the electronic apparatus shown in FIGS. 11A to 11A includes the organic EL device S that can emit desired light as described in the above-described embodiment, it has high display characteristics.

  Note that the electronic device is not limited to the electronic device as shown in FIG. 11, and the present invention can be applied to various electronic devices. For example, a desktop computer, a liquid crystal projector, a multimedia personal computer (PC) and an engineering workstation (EWS), a pager, a word processor, a television, a viewfinder type or a monitor direct view type video tape recorder, an electronic notebook, an electronic The present invention can be applied to electronic devices such as a desktop computer, a car navigation device, a POS terminal, and a device having a touch panel.

1 is a side sectional view schematically showing an example of an organic EL device according to a first embodiment. It is a schematic diagram which shows the wiring structure of the organic electroluminescent apparatus which concerns on 1st Embodiment. 1 is a plan view schematically showing an organic EL device according to a first embodiment. 1 is a cross-sectional view of an organic EL device according to a first embodiment. It is a schematic diagram which shows an example of the optical sensor which concerns on 1st Embodiment. It is a schematic diagram which shows an example of the wiring structure for reading the output of the optical sensor which concerns on 1st Embodiment. It is a schematic diagram which shows the wiring structure connected to the optical sensor which concerns on 1st Embodiment. 1 is a block diagram showing an electrical configuration of an organic EL device according to a first embodiment. It is a sectional side view which shows typically an example of the organic electroluminescent apparatus concerning 2nd Embodiment. It is a sectional side view which shows typically an example of the organic electroluminescent apparatus concerning 3rd Embodiment. It is a perspective view which shows an example of the electronic device which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 (1R, 1G, 1G) ... Light emitting element, 2 ... TFT array substrate, 3 ... Ejection surface, 4 ... Color filter, 4R, 4G, 4B ... Colored part, 5 ... Color filter substrate, 6 ... Optical sensor, 7 ... Control device, BM ... light shielding unit, S ... organic EL device

Claims (6)

A first substrate provided with a plurality of light emitting elements;
A second substrate that is disposed so as to face the first substrate and has an emission surface on which the light from the light emitting element is incident and that emits the incident light to the outside;
A plurality of colored portions provided on the second substrate, on which light from the light emitting element is incident, and capable of transmitting the incident light;
An organic electroluminescence device comprising: an optical sensor that is provided on the second substrate and detects light of the light emitting element that has passed through the colored portion. A plurality of pixels corresponding to the plurality of light emitting elements;
The organic electroluminescence device according to claim 1, wherein the coloring portion and the photosensor are provided for each pixel. Having a light-shielding part arranged at the boundary of a plurality of colored parts,
The organic electroluminescence device according to claim 1, wherein the optical sensor is disposed at a position where irradiation of light from the outside is suppressed by the light shielding unit. Having a light-shielding part arranged at the boundary of a plurality of colored parts,
The light sensor is disposed at a position where irradiation of light from the outside is suppressed by the light shielding portion,
The organic light-emitting device according to claim 1, wherein the light shielding part includes at least a part of a wiring connected to the photosensor.   The organic electroluminescence device according to any one of claims 1 to 4, further comprising a control device that adjusts electric power applied to the light emitting element based on a detection result of the optical sensor. A first substrate;
A light emitting device provided on the first substrate and including a first electrode facing the first substrate and a second electrode opposite to the first electrode;
The light emitting element is disposed so as to be connected to the second electrode on the light emission side, transmits part of the light of the light emitting element and reflects another part, and the first electrode and the second electrode A translucent reflective film that forms an optical resonator between,
A second substrate that is disposed so as to face the light emitting element on the first substrate, has a light emitting surface on which the light from the light emitting element is incident, and has an emission surface that emits the incident light to the outside;
An organic electroluminescence device comprising: an optical sensor that is provided on the second substrate and detects light of the light emitting element including the optical resonator.

Images