WO2006123776A1 - Dispositif émetteur de lumière et affichage à cristaux liquides - Google Patents

Dispositif émetteur de lumière et affichage à cristaux liquides Download PDF

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Publication number
WO2006123776A1
WO2006123776A1 PCT/JP2006/310031 JP2006310031W WO2006123776A1 WO 2006123776 A1 WO2006123776 A1 WO 2006123776A1 JP 2006310031 W JP2006310031 W JP 2006310031W WO 2006123776 A1 WO2006123776 A1 WO 2006123776A1
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Prior art keywords
region
light emitting
electrode
light
liquid crystal
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PCT/JP2006/310031
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English (en)
Japanese (ja)
Inventor
Masayuki Harada
Hiroyasu Kawauchi
Takayuki Ito
Norihito Takeuchi
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Kabushiki Kaisha Toyota Jidoshokki
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Publication of WO2006123776A1 publication Critical patent/WO2006123776A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers

Definitions

  • the present invention relates to a light emitting device and a liquid crystal display device, and more specifically, includes a light emitting portion having an electroluminescence (EL) element power in which a light emitting layer is provided between a first electrode and a second electrode.
  • the present invention relates to a light emitting device and a liquid crystal display device including such a light emitting device.
  • Liquid crystal display devices are widely used as displays for computers, portable devices, and the like.
  • a liquid crystal display device generally includes a backlight so that the display can be easily recognized even when the surroundings are dark.
  • a liquid crystal display device including a liquid crystal panel capable of simultaneously displaying a plurality of screens has been proposed (see, for example, Patent Document 1).
  • a light shielding wall between adjacent display areas By providing a light shielding wall between adjacent display areas, light from the backlight arranged corresponding to one display area is not incident on the other display area.
  • Patent Document 2 discloses an EL panel 71 shown in FIG.
  • the EL panel 71 is not shown in the figure! It is provided behind the liquid crystal panel and functions as a backlight.
  • the EL panel 71 includes a plurality of linear light emitting portions 72A, 72B, 72C, and 72D, and electrodes 73A, 73B, 73C, and 73D are provided at positions corresponding to the light emitting portions 72A to 72D, respectively.
  • the light emitting sections 72A to 72D are arranged in stripes so as to correspond to one display line which is a display unit of the liquid crystal panel.
  • Patent Document 3 discloses an improved liquid crystal display device that improves the image quality of moving images.
  • This liquid crystal display device includes a backlight that emits linear light extending in a direction orthogonal to the scanning direction of the liquid crystal panel and having a predetermined width. Linear light emitted from the backlight Are scanned in the same direction as the scanning direction of the liquid crystal panel.
  • a linear non-light emitting portion that does not always emit light exists between the adjacent light emitting portions 72A to 72D.
  • the non-light emitting unit between the light emitting units 72A to 72D that are lit can be visually recognized as dark lines. Therefore, the EL panel 71 in FIG. 16 is not necessarily preferable as a backlight.
  • Patent Document 2 has no description regarding moving image display, but when the EL panel 71 of FIG. 16 is used for moving image display, it is a so-called pseudo image similar to the backlight of the liquid crystal display device of Patent Document 3.
  • Impulse driving can be considered.
  • each of the light emitting units 72A to 72D is switched between the light emitting state and the non-light emitting state during a time required to scan the entire screen of the liquid crystal display device once, that is, one frame time. Even if each of the light emitting units 72A to 72D is switched between the light emitting state and the non-light emitting state during one frame time, all the light emitting units 72A to 72D appear to be always lit due to the afterimage. . However, if a non-light emitting portion exists between the adjacent light emitting portions 72A to 72D, it can be visually recognized as a dark line.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2004-184494
  • Patent Document 2 Japanese Patent Laid-Open No. 2000-75802
  • Patent Document 3 Japanese Patent Laid-Open No. 2002-6766
  • An object of the present invention is to provide a light emitting device capable of selectively emitting light in a plurality of light emitting regions and suppressing generation of dark lines, and a liquid crystal display device including such a light emitting device. There is.
  • the light-emitting device includes a light-emitting unit that also has an electo-luminescence element power.
  • the electoluminescence element includes a first electrode and a second electrode each having a terminal portion for receiving an external voltage, and a light emitting layer provided between the first electrode and the second electrode.
  • An organic electroluminescence element includes a plurality of first regions that selectively switch between a light emitting state and a non-light emitting state, and a second region that is located between the first regions adjacent to each other. It is set.
  • the organic electoluminescence device is responsible for the light emission in the first region. Instead, each second region is configured to be separated from the first region adjacent to the second region and prevented from being visually recognized by the user.
  • the light-emitting device includes a light-emitting portion that also serves as an electroluminescent device.
  • the electoluminescence device includes a first electrode and a second electrode, and a light emitting layer provided between the first electrode and the second electrode.
  • Each of the first electrode and the second electrode is a solid electrode.
  • the first electrode has a higher volume resistivity than the second electrode and is transparent.
  • the first electrode has three or more terminal portions.
  • the region of the electroluminescent element that emits light varies depending on which terminal portion is applied with voltage.
  • the area of the electroluminescent element that emits light when a voltage is applied to each terminal part is partly the same as the area of the electroluminescent element that emits light when a voltage is applied to another terminal part adjacent to the terminal part. overlapping.
  • liquid crystal display device including a backlight made of any of the above light emitting devices is provided.
  • FIG. 1 (a) is a schematic plan view of a light-emitting device according to a first embodiment of the present invention
  • FIG. 1 (b) is a schematic cross-sectional view taken along line IB-IB in FIG. 1 (a)
  • Fig. 1 (c) is a schematic cross-sectional view taken along line 1C 1C in Fig. 1 (a).
  • FIG. 2 (a) is a schematic plan view showing a transparent electrode of the light emitting device of FIG. 1 (a), and FIG. 2 (b) is a schematic cross-sectional view taken along line 2B-2B of FIG. 2 (a).
  • FIG. 3 is a schematic partial cross-sectional view of a liquid crystal display device according to a first embodiment including the light emitting device of FIG. 1 (a).
  • FIG. 4 is a schematic configuration diagram of a drive circuit of the liquid crystal display device of FIG.
  • FIG. 5 (a) is a schematic plan view showing a transparent electrode of a light-emitting device according to a second embodiment of the present invention
  • FIG. 5 (b) is a schematic cross-sectional view taken along line 5B-5B in FIG. 5 (a). .
  • FIG. 6 (a) is a schematic partial plan view showing a transparent electrode of a light-emitting device according to a third embodiment of the present invention
  • FIG. 6 (b) is a schematic cross-sectional view of the light-emitting device according to the third embodiment.
  • FIG. 7 is a schematic plan view of a light emitting device according to a fourth embodiment of the present invention.
  • FIG. 8 is a schematic cross-sectional view taken along line 8-8 in FIG.
  • FIG. 9 (a) and FIG. 9 (b) are schematic plan views of transparent electrodes of the light emitting device of FIG.
  • FIG. 10 is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention.
  • FIG. 11 is a schematic cross-sectional view of a light emitting device according to another embodiment of the present invention.
  • FIG. 12 (a) and FIG. 12 (b) are schematic partial plan views of a transparent electrode according to another embodiment of the present invention.
  • FIG. 13 is a schematic cross-sectional view showing a configuration of a terminal portion in another embodiment of the present invention.
  • FIG. 14 is a schematic diagram showing the arrangement of first regions and second regions in another embodiment of the present invention.
  • FIG. 15 is a schematic plan view of a transparent electrode according to another embodiment of the present invention.
  • FIG. 16 is a schematic plan view of a conventional EL panel.
  • the light emitting device 11 includes a planar light emitting portion 17 composed of an organic EL element 16.
  • the organic EL element 16 includes a substrate 12, a transparent electrode 13 as a first electrode provided on the substrate 12, an organic EL layer 14 as a light emitting layer provided on the transparent electrode 13, and an organic EL layer. And a counter electrode 15 as a second electrode provided on 14.
  • the organic EL element 16 is covered with a protective film 18 so that the organic EL layer 14 is not adversely affected by moisture (water vapor) and oxygen.
  • the substrate 12 is formed of a transparent glass cover.
  • the transparent electrode 13 is used as an anode, and the counter electrode 15 is used as a cathode.
  • the volume resistivity of the transparent electrode 13 is higher than the volume resistivity of the counter electrode 15.
  • “transparent” means that at least visible light can be transmitted. That is, the substrate 12 and the transparent electrode 13 can transmit at least visible light.
  • the transparent electrode 13 is made of indium stannate (ITO).
  • the counter electrode 15 is formed of a metal such as aluminum and has a property of reflecting light.
  • the organic EL element 16 is configured as a so-called bottom emission type in which light from the organic EL layer 14 is emitted through the substrate 12.
  • the protective film 18 is made of, for example, silicon nitride. Has been.
  • the organic EL element 16 includes a plurality of first regions 19 extending in the left-right direction and a second region positioned between the first regions 19 adjacent to each other. Region 20 is defined.
  • the extending direction of the first region 19 is orthogonal to the direction of vertical scanning in the liquid crystal panel 32 (see FIG. 3).
  • the first region 19 has the same width as the displacement.
  • Each portion of the transparent electrode 13 located in the first region 19 has the same width as that of the first region 19, and has a terminal portion 13a at one end (the left end in Figs. L (a) to (c)). have. That is, each portion of the transparent electrode 13 located in the first region 19 extends so as to be orthogonal to the direction of vertical scanning in the liquid crystal panel 32, and has a terminal portion 13a at one end.
  • the width of the first region 19 is the same as the width of a plurality of columns of pixels, unlike the width of one column of the liquid crystal panel 32 described later.
  • Each second region 20 includes a plurality of non-light emitting regions 20a and a plurality of light emitting regions 20b, as shown in FIG. 1 (c).
  • the non-light emitting region 20a has a dot shape, and the distribution density of the non-light emitting region 20a is higher as the position is closer to the terminal portion 13a of the transparent electrode 13.
  • the portion of the transparent electrode 13 located in the first region 19 and the portion of the transparent electrode 13 located in the second region 20 are made of a common material.
  • the portion of the counter electrode 15 located in the first region 19 and the portion of the counter electrode 15 located in the second region 20 are formed of a common material.
  • the portion of the organic EL layer 14 located in the first region 19 and the portion of the organic EL layer 14 located in the second region 20 are made of a common material.
  • the formation state of the transparent electrode 13 located in the second region 20 is the formation state of the transparent electrode 13 portion located in the first region 19. Is different. More specifically, a plurality of through-holes 13b are provided in each portion of the transparent electrode 13 located in the second region 20. The interval between the adjacent through holes 13b is closer to the terminal portion 13a of the transparent electrode 13, and becomes smaller as the position is larger.
  • the organic EL layer 14 is provided so as to cover the entire top surface of the transparent electrode 13 excluding a part of each terminal portion 13a and fills the through hole 13b.
  • the organic EL layer 14 is formed using a known organic EL material, and includes, for example, a hole transport layer, a light emitting layer, and an electron transport layer that are sequentially stacked from the transparent electrode 13 side.
  • the organic EL layer 14 emits white light when an electric field is applied.
  • the organic EL layer 14 may be formed by a three-color coating method using red, green, and blue light emitting materials. However, it may be formed by laminating red, green and blue light emitting layers. Alternatively, it may be formed by dispersing red, green and blue dyes in a host molecule or polymer.
  • the counter electrode 15 also has a solid electrode force.
  • the size of the counter electrode 15 in the vertical direction in FIG. 1 (a), that is, the width of the counter electrode 15 is slightly smaller than the size of the organic EL layer 14 in the vertical direction in FIG. 1 (a), that is, the width of the organic EL layer 14.
  • the dimensions of the counter electrode 15 in the left-right direction in FIGS. 1 (a) to 1 (c), that is, the length of the counter electrode 15, is organic in the left and right directions in FIGS. 1 (a) to 1 (c).
  • a part of the counter electrode 15 larger than the dimension of the EL layer 14, that is, the length of the organic EL layer 14 extends from one end of the organic EL layer 14 to constitute an electrode extension 15 b.
  • a terminal portion 15a for the counter electrode 15 is electrically connected to the electrode extension portion 15b.
  • the terminal portion 15a of the counter electrode 15 is located away from the terminal portion 13a of the transparent electrode 13 in the left-right direction of FIGS. 1 (a) to 1 (c).
  • the terminal portion 15a of the counter electrode 15 is made of the same material as that of the transparent electrode 13.
  • a method for manufacturing the light emitting device 11 will be described.
  • a transparent glass substrate 12 having an ITO film on the surface is prepared. Etching is performed on the ITO film to form the transparent electrode 13, the terminal portion 13a, the through hole 13b, and the terminal portion 15a.
  • an organic EL layer 14 is formed so as to cover the transparent electrode 13.
  • the organic EL layer 14 is formed by sequentially laminating the layers constituting the organic EL layer 14 by vapor deposition.
  • the counter electrode 15 is formed on the organic EL layer 14 by vapor deposition of aluminum (A1).
  • the electrode extension 15b of the counter electrode 15 is formed so as to cover a part of the terminal 15a, and as a result, the electrode extension 15b and the terminal 15a are electrically connected to each other.
  • the protective film 18 is formed.
  • the protective film 18 is also a ceramic such as silicon nitride
  • the protective film 18 is formed by, for example, a plasma CVD method.
  • the light emitting device 11 is used by being arranged on the back surface, which is the surface opposite to the display surface of the transmissive liquid crystal panel 32 of the liquid crystal display device 31.
  • the liquid crystal panel 32 has basically the same configuration as a known active matrix type liquid crystal panel for full color display.
  • the liquid crystal panel 32 includes a pair of transparent first substrate 33 and second substrate 34. Both boards 33, 34 Are bonded together with a sealing material (not shown) with a predetermined distance between them.
  • Liquid crystal 35 is sealed between 33 and 34.
  • the substrates 33 and 34 are made of glass, for example.
  • a pixel electrode 36 and thin film transistors (TFT) 37 connected to the pixel electrode 36 are formed in a matrix on the first substrate 33 disposed near the light emitting device 11.
  • the pixel electrode 36 and the TFT 37 are provided on the surface of the first substrate 33 facing the liquid crystal 35.
  • the pixel electrode 36 is made of ITO.
  • One set of three pixel electrodes 36 constitutes one pixel.
  • a polarizing plate 38 is provided on the surface of the first substrate 33 opposite to the liquid crystal 35.
  • a color filter 39 and a transparent electrode 40 common to all pixels are provided in the same order.
  • the transparent electrode 40 is made of ITO.
  • the color filter 39 has regions 39a, 39b, and 39c that transmit red, green, and blue light, and each region 39a, 39b, and 39c corresponds to one of the pixel electrodes 36 that constitute the sub-pixel. Has been placed. Adjacent areas 39 a to 39 c are partitioned by a black matrix 41.
  • a polarizing plate 42 is provided on the surface of the second substrate 34 opposite to the liquid crystal 35.
  • the light emitting device 11 has a substrate 12 facing the liquid crystal panel 32 and a first region 19 extending perpendicularly to the vertical scanning direction (left and right direction in FIG. 3) in the liquid crystal panel 32, that is, In Fig. 3, they are arranged so as to extend in a direction perpendicular to the paper surface.
  • a gate driver 44 for driving the gate electrode of the TFT 37 and a source electrode (data electrode) of the TFT 37 are provided on the outside of the display unit 43 composed of the liquid crystal panel 32 and the light emitting device 11.
  • a driver 46 for driving the light emitting device 11 are provided on the outside of the display unit 43 composed of the liquid crystal panel 32 and the light emitting device 11.
  • the terminal portion 13 a of the transparent electrode 13 is electrically connected to the driver 46.
  • Each driver 44 to 46 is controlled by a control signal from the control device 47.
  • the gate driver 44 supplies an address signal (sequential running signal) to the gate electrode of the TFT 37 based on the control signal from the control device 47, and the source driver 5 receives the control signal from the control device 47. Based on the above, the data signal is supplied to the source electrode of TFT37.
  • the time required to scan the entire screen once, that is, one frame time is set to 1Z60 seconds. Therefore, the output interval of the address signal is (1/60) X (lZAn) seconds, where An is the number of address signal lines.
  • the control device 47 synchronizes with the vertical scanning of the liquid crystal panel 32, that is, outputs an address signal.
  • the driver 46 is controlled to switch the first region 19 between the light emitting state and the non-light emitting state in order.
  • the control device 47 controls the driver 46.
  • the first area 19 is controlled so that the light emission state is maintained for a predetermined time after switching to the light emission state. Therefore, when the liquid crystal display device 31 is driven, two or more first regions 19 are simultaneously in a light emitting state.
  • the first area 19 switched to the light emitting state is replaced with the first area 19 to be switched to the first light emitting state.
  • the region 19 of the light is turned on, and after a certain time t has elapsed, it is switched to the non-lighted state.
  • This fixed time t is an extremely short time and is a length that cannot be recognized by human eyes.
  • Each first region 19 is selectively switched between a light emitting state and a non-light emitting state by a command signal from the control device 47, while a certain region of the liquid crystal panel 32 is in the display data rewriting period. In other words, the first region 19 located immediately below the region of the liquid crystal panel 32 is held in a non-light emitting state. If the first area 19 has a one-to-one correspondence with the scanning line of the pixel electrode 36, the display data rewriting period of the area of the liquid crystal panel 32 coincides with the data rewriting period for one scanning line. However, in the present embodiment, each first region 19 corresponds to a plurality of scanning lines of the pixel electrode 36.
  • the corresponding first region 19 The region 19 of 1 is held in a non-light emitting state. Thereafter, the first area 19 is held in a light emitting state for a preset period.
  • the liquid crystal panel 32 When displaying an image on the display screen of the liquid crystal panel 32, the liquid crystal panel 32 outputs an address signal from the gate driver 44 in response to a command signal from the control device 47, and the TFT 37 is turned on for each column. become. Similarly, in response to a command signal from the control device 47, a data signal is output from the source driver 45 and data is written to each pixel electrode 36. The written data is stored as a charge / discharge charge in a storage capacitor (not shown) of the pixel electrode 36, and a voltage having a magnitude corresponding to the charge is applied to the pixel electrode 36 until the next data write is performed. Held in a state. To each pixel electrode 36 As the applied voltage increases, the liquid crystal 35 facing the pixel electrode 36 can transmit more light. When the display data is rewritten to the pixel electrode 36, the first area 19 facing the pixel electrode 36 is held in a non-light emitting state, so that the quality of the moving image is improved.
  • an ON signal is output from the driver 46 to each terminal portion 13 a so as to synchronize with the address signal. While the ON signal is output, current is supplied to the first region 19 corresponding to the terminal portion 13a, and white light is emitted from the organic EL layer. Light from the organic EL layer 14 is emitted from the light emitting device 11 through the substrate 12, and enters the liquid crystal panel 32 through the first substrate 33.
  • the first region 19 emits light in order in synchronization with the vertical scanning of the liquid crystal panel 32.
  • each first region 19 is opposed to a column of pixel electrodes 36 corresponding to a plurality of scanning lines of the liquid crystal 35, so that the terminal portion of the transparent electrode 13 constituting the first region 19 is provided.
  • the output of the ON signal to 13a is performed after the display data rewriting (writing) to the TFT 37 of the 36 columns of the plurality of pixel electrodes facing the first region 19 is completed.
  • An amount of light corresponding to the state of voltage application to the pixel electrode 36 passes through the liquid crystal 35, passes through the transparent electrodes 40, and passes through the regions 39 a to 39 c of the color filter 39.
  • the user of the liquid crystal display device 31 visually recognizes an image formed by the light transmitted through the color filter 39 as a display on the liquid crystal display device 31.
  • the color of the color image is adjusted to a desired color by mixing the three primary colors of red, green, and blue in each pixel.
  • white light is emitted from the light emitting device 11 with a substantially constant amount of light, and the amount of light transmitted through the power filter 39 in each pixel according to the magnitude of the voltage applied to the pixel electrode 36, that is, the three primary colors in each pixel.
  • the mixing ratio of is adjusted.
  • the plurality of first regions 19 are selectively driven sequentially and switched between the light emitting state and the non-light emitting state within one frame time, apparently all the first regions 19 are simultaneously emitted. The entire light emission state is established.
  • the second region 20 includes a plurality of non-light emitting regions 20a and a plurality of light emitting regions.
  • the adjacent first region 19 when the adjacent first region 19 is in a light emitting state, the current from the portion of the transparent electrode 13 constituting the first region 19 is supplied to the portion of the transparent electrode 13 constituting the light emitting region 20b. As a result, light is emitted from the light emitting region 20b. Therefore, it is possible to prevent the second region 20 from being visually recognized by the user by being separated from the first region 19 adjacent to the second region 20.
  • the first region 19 is in a light emitting state, the light emitted from the second region 20 adjacent to the first region 19 has lower luminance than the light emitted from the first region 19.
  • the second region 20 is more transparent than the transparent electrode 13 portion of the first region 19.
  • the part of the electrode 13 has a high volume resistivity. Therefore, a current flows from the first region 19 to the first region 19 adjacent to the first region 19, thereby ensuring separation between the first regions 19 adjacent to each other.
  • the luminance of the organic EL element 16 is affected by the current density in the organic EL layer 14, and the luminance of the element 16 increases as the current density increases. Since the transparent electrode 13 has a higher volume resistivity than the counter electrode 15, the difference in current density in the organic EL layer 14 in which the difference in electrical resistance value is large is large between the portion near and far from the terminal portion 13a. Therefore, in order to reduce the brightness unevenness of each second region 20, the distribution density of the light emitting region 20b is lower as the position is closer to the terminal portion 13a, in other words, the position closer to the terminal portion 13a. It is preferable that the non-light emitting region 20a has a higher distribution density.
  • the first embodiment has the following effects.
  • the light emitting device 11 includes a light emitting unit 17 including an organic EL element 16 in which an organic EL layer 14 is provided between a transparent electrode 13 and a counter electrode 15.
  • the organic EL element 16 includes a plurality of first regions 19 and a second region 20 located between the first regions 19 adjacent to each other.
  • the organic EL element 16 is visually recognized by the user by dividing each second region 20 from the first region 19 adjacent to the second region 20 regardless of light emission of the first region 19. It is configured to prevent this. Therefore, it is possible to suppress the occurrence of dark lines between the first regions 19 when the first regions 19 adjacent to each other emit light at the same time.
  • the formation state of the transparent electrode 13 portion located in the second region 20 is different from the formation state of the transparent electrode 13 portion located in the first region 19. More specifically, a plurality of through-holes 13b are provided in each portion of the transparent electrode 13 located in the second region 20. Therefore, it is possible to suppress the occurrence of dark lines between the first regions 19 adjacent to each other with a simple configuration.
  • the second region 20 includes a plurality of non-light emitting regions 20a and a plurality of light emitting regions 20b, a light emitting region 20b exists between the first regions 19 adjacent to each other. Therefore, it is possible to suppress the occurrence of dark lines between the first regions 19 by the light emitting region 20b emitting light.
  • the non-light emitting region 20 a is configured by providing a through hole 13 b in a portion of the transparent electrode 13 located in the second region 20. Therefore, if the through-hole 13b is formed at the same time when the transparent electrode 13 is formed, the number of man-hours will not increase significantly due to the formation of the through-hole 13b.
  • the counter electrode 15 of the organic EL element 16 has a property of reflecting light. In this case, since the light emitted from the organic EL layer 14 to the counter electrode 15 is reflected by the counter electrode 15 efficiently, compared to the case where the counter electrode 15 does not have the property of reflecting light, The amount of light emitted from the organic EL element 16 through the transparent electrode 13 can be increased.
  • the liquid crystal display device 31 includes the light emitting device 11 that functions as a backlight.
  • the plurality of first regions 19 defined by the organic EL elements 16 of the light emitting device 11 extend perpendicular to the vertical scanning direction of the liquid crystal panel 32, and emit light according to a command signal from the control device 47. And a non-light emitting state are selectively switched. While a certain area of the liquid crystal panel 32 is in the display data rewriting period, the first area 19 located immediately below the area of the liquid crystal panel is held in a non-light emitting state. Therefore, when moving images are displayed on the liquid crystal display device 31, the generation of afterimages is suppressed and the quality of the moving image is improved.
  • the light emitting section 17 is composed of the organic EL element 16. In this case, it is possible to emit light at a lower voltage than in the case where the light emitting unit 17 is made of an inorganic EL element.
  • FIGS. 5 (a) and 5 (b) a second embodiment of the present invention will be described with reference to FIGS. 5 (a) and 5 (b).
  • the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. .
  • the transparent electrode portions 13 located in the first region 19 all have the same width and extend in parallel to each other.
  • a terminal portion 13 a is formed at one end of each transparent electrode portion 13.
  • the thickness of the transparent electrode portion 13S located in the second region 20 is smaller than the thickness of the transparent electrode portion 13 in the first region 19.
  • each second region 20 does not include a non-light emitting region, and is configured by a light emitting region.
  • the ITO film formed on the surface of the transparent glass substrate 12 is etched to obtain the transparent electrode portion 13, the terminal portion 13a, and the terminal portion 15a. Form. At the same time, a portion to be the transparent electrode portion 13S is also etched to form a transparent electrode portion 13S having a predetermined thickness.
  • the subsequent steps for forming the organic EL layer 14, the counter electrode 15, the protective film 18 and the like are the same as those in the first embodiment.
  • the second region 20 adjacent to the first region 19 via the transparent electrode portion 13 of the first region 19 is used. Since current flows through the transparent electrode portion 13S, the second region 20 is also in a light emitting state. However, since the thickness of the transparent electrode portion 13S in the second region 20 is smaller than the transparent electrode portion 13 in the first region 19, the amount of current flowing through the transparent electrode portion 13S is the amount of current flowing through the transparent electrode portion 13. The smaller second region 20 emits light with lower brightness than the first region 19.
  • the second embodiment has the following effects in addition to the effects (1), (2), and (6) to (9) of the first embodiment.
  • the transparent electrode portion 13S is a force that exists over the entire second region 20.
  • the transparent electrode portion 13S is transparent because the thickness of the transparent electrode portion 13S is smaller than the thickness of the transparent electrode portion 13 in the first region 19.
  • the second region 20 in which the amount of current flowing through the electrode portion 13S is smaller than the amount of current flowing through the transparent electrode portion 13 emits light with a lower luminance than the first region 19. Therefore, it is possible to suppress the occurrence of dark lines between the first regions 19 adjacent to each other.
  • FIGS. 6 (a) and 6 (b) differs from the first embodiment in that the configuration of the second region 20 and the point that the light diffusing member is provided on the light emitting surface of the light emitting device 11 are different from those in the first embodiment. Parts similar to those of the embodiment are given the same reference numerals, and detailed description thereof is omitted.
  • a groove 21 having a certain width extending in a meandering manner is defined between the transparent electrode portions 13 located in the first regions 19 adjacent to each other.
  • a terminal portion 13 a is formed at one end of each transparent electrode portion 13.
  • the linear portions 21a adjacent to each other in the groove 21 intersect at an angle of 90 degrees.
  • the width of the groove 21 is, for example, about 30 / z m.
  • the second region 20 is a portion of the organic EL element 16 corresponding to the groove 21. Therefore, each second region 20 does not include a light emitting region, and is configured by a non-light emitting region.
  • the ITO film formed on the surface of the transparent glass substrate 12 is etched to obtain the transparent electrode portion 13, the terminal portion 13a, and the terminal portion 15a. Form. At the same time, etching is performed also on the portion that should become the groove 21 to form the groove 21 between the transparent electrode portions 13 adjacent to each other.
  • the subsequent steps of forming the organic EL layer 14, the counter electrode 15, the protective film 18 and the like are the same as those in the first embodiment.
  • the light emitting device 11 has a light diffusing member on the surface opposite to the surface of the substrate 12 facing the transparent electrode 13, that is, on the light emitting surface of the light emitting device 11.
  • the light diffusion sheet 22 is provided.
  • the light emitted from the light emitting device 11 through the substrate 12 is diffused by the light diffusion sheet 22 and irradiated onto the liquid crystal panel 32.
  • the second region 20 is a light emitting region. There is no area. If the second region 20 is straight as in the prior art, the light emitted from the pair of first regions 19 adjacent to the second region 20 passes through the second region 20 in the second region. It does not proceed along the direction of 20 extension. Therefore, even if the light diffusion sheet 22 is used, the second region 20 is easily visually recognized by the user of the liquid crystal display device 31 as a dark line.
  • the second region 20 extends in a meandering manner rather than in a straight line, so that light emitted from the pair of first regions 19 adjacent to the second region 20 is the first. There is also a lot of light that enters the second region 20 from various directions and travels along the direction in which the second region 20 extends. Therefore, the use of the light diffusion sheet 22 makes it difficult for the second region 20 to be visually recognized as a dark line.
  • the third embodiment has the following effects.
  • a light diffusing sheet 22 is provided on the light emitting surface of the light emitting device 11, and the second region 20 is a non-light emitting region extending in a meandering manner. Therefore, the second region 20 does not include a light emitting region, but light emitted from the pair of first regions 19 adjacent to the second region 20 enters the second region 20 from various directions. Therefore, the use of the light diffusion sheet 22 makes it difficult for the second region 20 to be visually recognized as a dark line.
  • FIGS. 7 to 9 a fourth embodiment of the present invention will be described with reference to FIGS. 7 to 9 (b). Note that parts similar to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the light emitting device 11 includes a planar light emitting unit 17 including an organic EL element 16.
  • the organic EL element 16 includes a substrate 12, a transparent electrode 13 as a first electrode provided on the substrate 12, an organic EL layer 14 as a light emitting layer provided on the transparent electrode 13, and an organic EL element 16. And a counter electrode 15 as a second electrode provided on the EL layer 14.
  • the organic EL element 16 is covered with a protective film 18 so that the organic EL layer 14 is not adversely affected by moisture (water vapor) and oxygen.
  • the substrate 12 is also formed with a transparent glass force.
  • Transparent electrode 13 and Each of the counter electrodes 15 is a solid electrode, and the transparent electrode 13 has a higher volume resistivity than the counter electrode 15. Further, the transparent electrode 13 forms an anode, and the counter electrode 15 forms a cathode.
  • the transparent electrode 13 is made of ITO, and the counter electrode 15 is made of aluminum.
  • the organic EL element 16 is configured as a so-called bottom emission type in which light from the organic EL layer 14 is emitted through the substrate 12.
  • the transparent electrode 13, the organic EL layer 14, and the counter electrode 15 are formed in a rectangular shape.
  • a plurality of terminal portions are provided at both ends of the transparent electrode 13 in the direction perpendicular to the vertical scanning direction of the liquid crystal panel 32 (both ends in the left-right direction in FIG. 7).
  • 13a is provided. More specifically, each of a pair of opposing sides of the light emitting portion 17 having a rectangular shape is provided with a plurality of terminal portions 13a arranged along the sides.
  • the plurality of terminal portions 13a provided on both sides are arranged symmetrically with respect to the center line of the transparent electrode 13 (the center line in the left-right direction in FIG. 7).
  • the region of the organic EL element 16 that emits light differs depending on which terminal portion 13a is applied with a voltage.
  • the region of the organic EL element 16 that emits light when a voltage is applied to each terminal portion 13a is the region of the organic EL element 16 that emits light when a voltage is applied to another terminal portion 13a adjacent to the terminal portion 13a. It overlaps partially.
  • the terminal portion 15a of the counter electrode 15 is provided on the side of the light emitting portion 17 different from the side where the terminal portion 13a of the transparent electrode 13 is provided.
  • the terminal portion 13a of the transparent electrode 13 is electrically connected to the driver 46, and a voltage is selectively applied to each terminal portion 13a via the driver 46 by a command signal from the control device 47.
  • the driver 46 constitutes voltage applying means for selectively applying a voltage to the terminal portion 13a.
  • the light emitting device 11 in this embodiment is manufactured in substantially the same manner as the light emitting device 11 of the first embodiment.
  • the difference from the case of the first embodiment is that the transparent electrode 13 is a solid electrode and that the terminal portions 13a are arranged symmetrically on both sides of the transparent electrode 13.
  • the light emitting device 11 of this embodiment is also used as a backlight of the pseudo impulse drive type liquid crystal display device 31.
  • an ON signal is output from the driver 46 to each terminal portion 13a so as to synchronize with the address signal.
  • the control device 47 determines that the area where the liquid crystal panel 32 is directly above each light emitting area is the display data rewriting period.
  • the application of voltage to the terminal portion 13a is controlled through the driver 46 so that the region of the organic EL element 16 located immediately below the region of the liquid crystal panel 32 is maintained in a non-light emitting state.
  • Light of the organic EL layer 14 is emitted from the light emitting device 11 through the substrate 12 and enters the liquid crystal panel 32 through the first substrate 33.
  • the transparent electrode 13 is a solid electrode and has a large volume resistivity
  • the terminal portion 13a in a state where a voltage is applied (ON state) is provided as shown by a two-dot chain line in FIG. 9 (b).
  • a predetermined range at the center is the light emitting region 24 of the organic EL element 16. This light emitting region 24 extends to a part of the virtual band-like region 23 corresponding to the terminal portion 13a to which the adjacent voltage is not applied (OFF state).
  • the fourth embodiment has the following effects in addition to the effects (6) and (9) of the first embodiment.
  • the transparent electrode 13 and the counter electrode 15 are each composed of a solid electrode, and the transparent electrode 13 is provided with three or more terminal portions 13a having a volume resistivity higher than that of the counter electrode 15.
  • the region of the organic EL element 16 that emits light differs depending on which terminal portion 13a is applied with a voltage, and the region of the organic EL element 16 that emits light when a voltage is applied to each terminal portion 13a. Is partially overlapped with a region of the organic EL element 16 that emits light when a voltage is applied to another terminal portion 13a adjacent to the terminal portion 13a. Therefore, unlike a conventional light emitting device having a plurality of light emitting regions that are driven in a divided manner, the dark line can be made inconspicuous even in the full light emission state or the apparent full light emission state.
  • the light emitting portion 17 is formed in a rectangular shape, and a pair of terminal portions 13a are arranged on each of a pair of opposing sides of the light emitting portion 17 along the side. Is arranged. Accordingly, the degree of freedom of the range covering the light emitting region force S is increased in accordance with the voltage application state to the terminal portion 13a. For example, it is possible to display an image on only one half of the screen of the liquid crystal display device 31 or to drive half of the screen simultaneously under different conditions.
  • the light emitting device 11 is used as a backlight of the pseudo impulse drive type liquid crystal display device 31.
  • the terminal portion 13a has a predetermined interval along the vertical scanning direction of the liquid crystal panel 32. Terminals are arranged so that the backlight area located immediately below the area of the liquid crystal panel is kept in a non-light-emitting state while an area of the liquid crystal panel 32 is in the display data rewriting period.
  • Application of the voltage to the unit 13a is controlled by the controller 47 through the driver 46. Therefore, when moving images are displayed on the liquid crystal display device 31, the occurrence of afterimages is suppressed and the quality of the moving image is improved.
  • the first to fourth embodiments may be modified as follows, for example.
  • the transparent electrode 13 located in the second region 20 is penetrated.
  • a through-hole 15c is provided in the portion of the counter electrode 15 located in the second region 20 as shown in FIG.
  • the non-light emitting region 20a may be formed in the second region 20.
  • the distribution density of the through holes 15c is preferably provided such that the density is higher as the position is closer to the terminal portion 13a. In this case, substantially the same effect as the first embodiment can be obtained.
  • the portion where the through-hole 15c is formed does not reflect the light emitted from the organic EL layer 14 toward the counter electrode 15, and therefore the transparent electrode 13 has the direction force when the through-hole 13b is provided.
  • the amount of light emitted through the can be increased.
  • the through holes 13b and 15c may be provided in both the transparent electrode 13 and the counter electrode 15.
  • an insulating part may be provided between the transparent electrode 13 and the organic EL layer 14 or between the organic EL layer 14 and the counter electrode 15.
  • the non-light emitting region 20a may be formed in the second region 20.
  • insulating portions may be provided both between the transparent electrode 13 and the organic EL layer 14 and between the organic EL layer 14 and the counter electrode 15.
  • the insulating portion is provided between the transparent electrode 13 and the organic EL layer 14! /.
  • the shape of the through holes 13b, 15c and the insulating portion provided to form the non-light emitting region 20a in the second region 20 is not limited to an ellipse, but may be a perfect circle or a polygon such as a triangle or a rectangle. Or May be. Also, different shapes may be mixed, or different sizes may be mixed.
  • the second region 20 is transparent.
  • the thickness of the electrode portion 13S may not be constant.
  • the thickness of the transparent electrode portion 13S may be smaller as the position is closer to the terminal portion 13a. In this case, the second region 20 is more difficult to be visually recognized as compared with the case where the thickness of the transparent electrode portion 13S in the second region 20 is uniform.
  • the transparent electrode portion 13S in the region 20 and the transparent electrode 13 in the first region 19 may be formed with different material forces.
  • the second region 20 is not limited to a straight line, and may extend in a wavy line, for example.
  • the groove 21 is not limited to the shape shown in FIG. 6 (a), and for example, may extend so as to repeat an S-shape as shown in FIG. 12 (a). As shown in 12 (b), it may extend in a zigzag so as to include a plurality of straight line portions 21a. Further, the groove 21 may include both a straight portion and a curved portion. In this case, the same effect as that of the third embodiment can be obtained.
  • the light diffusing member is not limited to the light diffusing sheet 22.
  • the light diffusion sheet 22 is provided separately from the substrate 12 instead of being provided integrally with the substrate 12.
  • the interval between the second regions 20 adjacent to each other that is, the width of the first region 19 is not limited, and the width of the first region 19 is different from each other. Also good.
  • a pair of terminal portions 13 a for the transparent electrode 13 may be provided on each of a pair of opposing sides of the light emitting portion 17.
  • a pair of terminal portions 15 a for the counter electrode 15 may be provided on each of a pair of opposing sides of the light emitting portion 17.
  • the terminal portion 15a of the counter electrode 15 is not formed of the same material as that of the transparent electrode 13, and the counter electrode 15 You may comprise by an extension part.
  • the terminal portion 15a of the counter electrode 15 may be arranged on the side not corresponding to the terminal portion 13a of the transparent electrode 13. ,.
  • the terminal portion 15a of the counter electrode 15 may be disposed on the side corresponding to the terminal portion 13a of the transparent electrode 13.
  • the terminal portion 13a of the transparent electrode 13 is formed long and insulated from the portion close to the organic EL layer 14 on the terminal portion 13a.
  • a membrane 25 is provided.
  • an electrode extension 15 b is provided on the insulating film 25.
  • the terminal portion 15a of the counter electrode 15 is formed on the insulating film 25 so as to be electrically connected to the electrode extension portion 15b.
  • the terminal portion 15 a is made of the same material as the transparent electrode 13.
  • the first region 19 is not limited to a configuration extending in a direction orthogonal to the vertical scanning direction of the liquid crystal panel 32.
  • the light emitting unit 17 may be partitioned into two first regions 19 and a second region 20 sandwiched between them.
  • the two first regions 19 may have the same shape, or may have different shapes as shown in FIG.
  • the terminal portion 13 a may be provided only on one side of the transparent electrode 13.
  • the width of the transparent electrode 13 is preferably about 1Z2 or less when the terminal portion 13a is provided on both sides of the transparent electrode 13.
  • the arrangement of the terminal portion 13a is not limited to a configuration in which only one side of the rectangular transparent electrode 13 or a pair of two opposing sides is arranged. Three or more terminal portions 13a may be provided so that a light emitting region is formed in accordance with the display region of the liquid crystal panel 32.
  • the screen of the liquid crystal panel 32 is large, the number of columns of the pixel electrodes 36 that are vertically scanned during one frame time is large, and the screen is arranged in the vertical scanning direction depending on the display device.
  • the light-emitting device 11 also divides a plurality of light-emitting regions correspondingly.
  • the voltage application to the transparent electrode 13 may be controlled so that the first region 19 emits light in order in synchronization with the vertical scanning of the liquid crystal panel 32 for each divided light emitting region. ,.
  • the plurality of first regions 19 are simultaneously in the light emitting state in the steady state,
  • a configuration may be adopted in which one region 19 is sequentially turned on.
  • the first region 19 is not limited to the width capable of irradiating light to the pixel electrodes 36 in a plurality of columns at the time of light emission. Also good. In this case, the first region 19 is switched between the light emitting state and the non-light emitting state in a one-to-one synchronization with the vertical scanning of the liquid crystal panel 32.
  • the substrate 12 is not limited to glass strength, and may be a transparent resin substrate or film.
  • the transparent electrode 13 may be formed not only with ITO force but also with indium zinc oxide (IZO), acid zinc (ZnO) or tin oxide (SnO) force!
  • IZO indium zinc oxide
  • ZnO acid zinc
  • SnO tin oxide
  • the counter electrode 15 is not limited to an aluminum force, and may be formed of a metal such as gold, silver, copper, chromium, or an alloy thereof.
  • the counter electrode 15 does not have to reflect light.
  • the organic EL layer 14 may be configured to emit, for example, monochromatic light such as red, blue, green, yellow, or a combination thereof instead of white light.
  • the organic EL element 16 is not limited to the bottom emission type, and may be a so-called top emission type in which light from the organic EL layer 14 is emitted through the side opposite to the substrate 12.
  • the counter electrode 15, the organic EL layer 14, and the transparent electrode 13 are formed on the substrate 12 in the same order.
  • the counter electrode 15 may be transparent or opaque as long as it is made of a material having a lower volume resistivity than the transparent electrode 13.
  • the substrate 12 may be opaque.
  • the color filter 39 of the liquid crystal panel 32 may be omitted. In this case, the liquid crystal panel 32 displays a black and white image.
  • the light emitting unit 17 of the light emitting device 11 may have an inorganic EL element power including an organic EL layer instead of the organic EL element 16 including the organic EL layer 14.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Le dispositif émetteur de lumière selon l'invention (11) comprend une section émettrice de lumière (17) composée d'un élément organique électroluminescent (EL) (16). L’élément organique EL (16) comporte une électrode transparente (13), une contre-électrode (15), et une couche organique EL (14) disposée entre l’électrode transparente (13) et la contre-électrode (15). Dans l’élément organique EL (16), des premières zones (19) alternant de façon sélective entre un état émetteur de lumière et un état non émetteur de lumière et une seconde zone (20) disposée entre les premières régions adjacentes (19) sont délimitées. Indépendamment de l’état d’émission des premières zones (19), la seconde zone (20) n'est pas différenciable par l’utilisateur par rapport aux premières zones (19) adjacentes aux secondes zones (20).
PCT/JP2006/310031 2005-05-20 2006-05-19 Dispositif émetteur de lumière et affichage à cristaux liquides WO2006123776A1 (fr)

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JP2005148505A JP2006324600A (ja) 2005-05-20 2005-05-20 発光装置及び液晶表示装置
JP2005-148505 2005-05-20

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Publication number Priority date Publication date Assignee Title
JP4989396B2 (ja) * 2007-09-25 2012-08-01 パナソニック株式会社 面状発光モジュール
WO2013186916A1 (fr) * 2012-06-15 2013-12-19 パイオニア株式会社 Dispositif électroluminescent organique

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57157487A (en) * 1981-03-23 1982-09-29 Nippon Electric Co Multicolor emitting field light emitting lamp
JPS62272499A (ja) * 1986-05-21 1987-11-26 日産自動車株式会社 薄膜ｅｌパネル
JPH0325894A (ja) * 1989-06-23 1991-02-04 Pioneer Electron Corp エレクトロルミネッセンス表示素子
JPH03159096A (ja) * 1989-11-17 1991-07-09 Hitachi Maxell Ltd 分散形エレクトロルミネッセンス素子
JP2000075802A (ja) * 1998-08-26 2000-03-14 Matsushita Electric Ind Co Ltd バックライト装置およびバックライト素子
JP2000082587A (ja) * 1998-09-03 2000-03-21 Matsushita Electric Ind Co Ltd 分散型多色発光ｅｌランプ
WO2000036662A1 (fr) * 1998-12-16 2000-06-22 Cambridge Display Technology Ltd. Dispositifs lumineux organiques
JP2003243182A (ja) * 2002-02-19 2003-08-29 Sanyo Electric Co Ltd 有機ｅｌ素子

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57157487A (en) * 1981-03-23 1982-09-29 Nippon Electric Co Multicolor emitting field light emitting lamp
JPS62272499A (ja) * 1986-05-21 1987-11-26 日産自動車株式会社 薄膜ｅｌパネル
JPH0325894A (ja) * 1989-06-23 1991-02-04 Pioneer Electron Corp エレクトロルミネッセンス表示素子
JPH03159096A (ja) * 1989-11-17 1991-07-09 Hitachi Maxell Ltd 分散形エレクトロルミネッセンス素子
JP2000075802A (ja) * 1998-08-26 2000-03-14 Matsushita Electric Ind Co Ltd バックライト装置およびバックライト素子
JP2000082587A (ja) * 1998-09-03 2000-03-21 Matsushita Electric Ind Co Ltd 分散型多色発光ｅｌランプ
WO2000036662A1 (fr) * 1998-12-16 2000-06-22 Cambridge Display Technology Ltd. Dispositifs lumineux organiques
JP2003243182A (ja) * 2002-02-19 2003-08-29 Sanyo Electric Co Ltd 有機ｅｌ素子

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