JP5136844B2 - Backlight and liquid crystal display device - Google Patents

Description

  The present invention relates to a backlight serving as a light source for image display and a liquid crystal display device including the backlight.

  A liquid crystal display device includes a liquid crystal display panel in which a polarizing plate that transmits only light that vibrates in one direction is attached to the surfaces (outer surfaces) of two glass substrates containing liquid crystal, and the liquid crystal display panel It is comprised from the backlight which irradiates light from the back side.

  In addition to the polarizing film that performs linear polarization, the polarizing plate is made by laminating various types of films, such as equipment films with support functions, PET (polyethylene terephthalate) films for protection, and protective films for protection from the outside. It has a bonded structure.

  For this reason, the member cost of a polarizing plate is high, and it is also a factor which raises the manufacturing cost of a liquid crystal display panel. In addition, in the process of attaching a polarizing plate to two glass substrates, defects such as dust trapping and air bubbles are likely to occur at the interface between the glass substrate and the polarizing plate, which increases the yield of liquid crystal display panels. This is a cause of lowering the manufacturing cost.

  In the polarizing plate externally attached to the liquid crystal display panel, the above-described problems occur. In recent years, a structure in which a polarizer is built in a liquid crystal display panel has been proposed (for example, see Patent Document 1).

JP 2003-167246 A

  However, in the case of adopting a structure in which a polarizer is built in a liquid crystal display panel, it is inconvenient for designing a pixel circuit such as an electrical short circuit between a driving substrate on which a thin film transistor is formed and each electrode, and interposition of parasitic capacitance. There are many things.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide an external polarizer in a liquid crystal display device including a liquid crystal display panel and a backlight without incorporating the polarizer in the liquid crystal display panel. It is to provide a mechanism that can reduce the number of people.

Backlight according to the present invention, one pair of substrates and the light extraction side, provided on the inner surface side of the substrate of the light extraction side Chi substrate sac of a pair Rutotomoni, a plurality of metal wires are arranged in parallel a wire grid polarizer comprising, have a light emitting layer provided in a state facing the wire grid polarizer between the substrate one pair, a cross-section of an end of the light-emitting layer side of the metal wire of the wire grid polarizer The shape is a mountain shape .

  In the backlight according to the present invention, the light emitted from the light emitting layer provided between the pair of substrates is incident on the polarizer provided on the inner surface side of the substrate on the light extraction side and passes therethrough. , Extracted as linearly polarized light.

  According to the present invention, the number of external polarizers can be reduced without adopting a polarizer in the liquid crystal display panel by adopting a backlight structure incorporating the polarizer.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a schematic configuration of a transmissive liquid crystal display device to which the present invention is applied. The illustrated liquid crystal display device 1 mainly includes a liquid crystal display panel (liquid crystal cell) 2 and a backlight 3.

  Although not shown, the liquid crystal display panel 2 is encapsulated between a drive substrate on which a pixel circuit including, for example, a thin film transistor is formed, a counter substrate disposed to face the drive substrate, and the drive substrate and the counter substrate. And a liquid crystal layer. The drive substrate and the counter substrate are each configured using a transparent glass substrate.

  One surface of the liquid crystal display panel 2 serves as a light incident surface, and the backlight 3 is disposed so as to face the light incident surface. The other surface of the liquid crystal display panel 2 serves as a light emission surface (image display surface), and a polarizing plate 4 is attached to the light emission surface. Incidentally, a polarizing plate is not attached to one surface (light incident surface) of the liquid crystal display panel 2.

  The backlight 3 irradiates light from the back side of the liquid crystal display panel 2.

  In general, the backlight structure of a transmissive liquid crystal display device is mainly classified into a direct backlight, an edge light backlight, and a planar light source backlight. The direct type backlight is a surface light source in which a fluorescent lamp and a reflective film are placed directly behind a liquid crystal display panel. Direct-type backlights are often used in combination with liquid crystal display panels for large television applications because they have high luminous efficiency and high luminance.

  However, in the direct type backlight, as the television monitor becomes larger, the number of fluorescent lamps as light sources increases, and the weight increases accordingly. Further, in order to conceal the arrangement of the fluorescent lamps and make a uniform surface light source, a sufficient depth of 20 mm to 40 mm is necessary, and this is the biggest factor for thickening the liquid crystal display device.

  The edge light type backlight is a surface light source in which a fluorescent lamp is placed on the side surface of a light guide plate. The edge-light type backlight is relatively thin but has a relatively low luminance and is very heavy due to the light guide plate. Therefore, a flat light source type backlight is ideal for television applications. An organic EL (Electro Luminescence) or a flat fluorescent lamp is used as a light source for the flat light source type backlight.

  In particular, since organic EL has few members and does not require an inverter, it can be thin and light in principle and is a backlight suitable for a thin television. For this reason, in the embodiment of the present invention, an organic EL backlight using an organic EL suitable for being thin and light as a light source is employed in the backlight 3 described above.

  FIG. 2 is a cross-sectional view of a backlight according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of the backlight.

  As shown in the figure, the backlight 3 is roughly composed of a pair (two) of substrates 11 and 12, a wire grid polarizer 13 as a polarizer, a pair (two) of electrodes 14 and 15, and an organic layer 16. And a sealing material 17.

  The pair of substrates 11 and 12 are arranged in a state of facing each other in the thickness direction of the backlight 3. One of the pair of substrates 11 and 12 is a “light extraction side” substrate for extracting light from the backlight 3 to the outside. For this reason, the substrate 11 is configured using a transparent glass substrate having a very high light transmittance. The substrate 12 may be configured using a transparent glass substrate, for example, similarly to the substrate 11, but may not have the property of transmitting light particularly in terms of the function of the backlight 3.

  The wire grid polarizer 13 is a polarizer that changes light (natural light) emitted from a light emitting layer to be described later into linearly polarized light. The wire grid polarizer 13 is provided on the inner surface side of the substrate 11. The inner surface of the substrate 11 refers to the surface on the side facing the substrate 12. For this reason, the wire grid polarizer 13 provided on the inner surface side of the substrate 11 is disposed so as to face the substrate 12 via the pair of electrodes 14 and 15 and the organic layer 16 sandwiched therebetween.

  The wire grid polarizer 13 has a stripe structure in which metal wires (metal lines) 13A elongated in the Y-axis direction are arranged at equal intervals in the X-axis direction. The X-axis direction in FIG. 3 corresponds to the horizontal direction on the display surface of the liquid crystal display panel 2, and the Y-axis direction corresponds to the vertical direction.

  In the present embodiment, the arrangement direction of the metal wires 13A constituting the wire grid polarizer 13 is the X-axis direction, and the longitudinal direction of the metal wires 13A is the Y-axis direction. However, in carrying out the present invention, the arrangement direction of the metal wires 13A may be the Y-axis direction, and the longitudinal direction of the metal wires 13A may be the X-axis direction.

  The wire grid polarizer 13 is a polarizer having excellent polarization efficiency, high transmittance, and a wide viewing angle. The interval between the metal wires 13A arranged in the X-axis direction is set to be smaller than the wavelength of light (visible light) emitted from the light emitting layer so that the wire grid polarizer 13 has a desired polarization function. For example, the interval between the metal wires 13A is about 100 nm, and the line width of the metal wires 13A is about 50 nm.

  The wire grid polarizer 13 reflects polarized light having an electric field vector that vibrates in a direction parallel to the metal wire 13A (Y-axis direction) and vibrates in a direction orthogonal to the metal wire 13A (X-axis direction). The linearly polarized light is obtained by transmitting the polarized light having For this reason, the wire grid polarizer 13 uses the X axis along the arrangement direction of the metal wires 13A as the transmission axis and the Y axis intersecting (orthogonal) as the reflection axis. Accordingly, among the light incident on the wire grid polarizer 13 from the light emitting layer, the light oscillating in the X-axis direction is transmitted through the wire grid polarizer 13 to become linearly polarized light, and the other light is reflected by the wire grid polarizer 13. And return light.

  Incidentally, the polarizing plate 4 provided on the liquid crystal display panel 2 side and the wire grid polarizer 13 have a relationship in which the rotational phase of the transmission axis is shifted by 90 °. That is, if the transmission axis of the wire grid polarizer 13 is parallel to the X axis, the transmission axis of the polarizing plate 4 is parallel to the Y axis, and the absorption axis of the polarizing plate 4 is parallel to the X axis.

  One of the pair of electrodes 14 and 15 is an anode electrode, and the other is a cathode electrode. Here, the electrode 14 near the substrate 11 on the light extraction side is an anode electrode, and the electrode 15 near the substrate 12 on the opposite side to the light extraction side is a cathode electrode. For this reason, the anode electrode 14 is disposed on the light extraction side, and the cathode electrode 15 is disposed on the side opposite to the light extraction side.

  The anode electrode 14 is formed as a transparent electrode that transmits light in order to extract light emitted from the light emitting layer in the backlight 3 to the outside. The anode electrode 14 is formed as a reflective electrode that reflects light in order to effectively use the light emitted from the light emitting layer in the backlight 3 (that is, to increase the light extraction efficiency).

  For this reason, the anode electrode 14 is configured using a conductive material having a high light transmittance, such as ITO (Indium-Tin-Oxide) and IZO (Indium-Zinc-Oxide). The cathode electrode 15 is configured using a conductive material (metal material) having a high light reflectance such as aluminum (Al) or silver (Ag). A material having a low work function, for example, calcium (Ca) or lithium (Li) compound is formed on the interface between the cathode electrode and the organic layer to improve electron injection.

  The wire grid polarizer 13 described above is in physical contact (electrically conductive) with the electrode surface outside the anode electrode 14. The wire grid polarizer 13 is provided between the substrate 11 and the anode electrode 14.

  The organic layer 16 is provided in a state of being sandwiched between the anode electrode 14 and the cathode electrode 15. The organic layer 16 is formed using an organic material. From the anode electrode 14 toward the cathode electrode 15, a hole injection layer 18, a hole transport layer 19, a light emitting layer (organic light emitting layer) 20, and an electron transport layer 21. Is a four-layer structure in which are stacked in order.

  The hole injection layer 18 is formed of, for example, m-MTDATA [4,4,4-tris (3-methylphenylphenylamino) triphenylamine]. The hole transport layer 19 is formed of, for example, α-NPD [4,4-bis (N-1-naphthyl-N-phenylamino) biphenyl]. Note that the material is not limited to this, and hole transport materials such as a benzidine derivative, a styrylamine derivative, a triphenylmethane derivative, and a hydrazone derivative can be used. Moreover, the hole injection layer 18 and the hole transport layer 19 may each have a laminated structure including a plurality of layers.

  The light emitting layer 20 is formed of, for example, different organic light emitting materials for R (red), G (green), and B (blue) color components. Specifically, in the red light emitting layer, for example, 2,6≡bis [(4′≡methoxydiphenylamino) styryl] ≡1,5≡dicyanonaphthalene (BSN) as a dopant material is added to ADN as a host material. Consists of a mixture by weight%. The green light emitting layer is composed of, for example, 5% by weight of coumarin 6 as a dopant material mixed with ADN as a host material. For example, the blue light-emitting layer is formed by adding 2.5 weight of 4,4′≡bis [2≡ {4≡ (N, N≡diphenylamino) phenyl} vinyl] biphenyl (DPAVBi) as a dopant material to ADN as a guest material. % Mixture.

  The electron transport layer 21 is formed of, for example, 8≡hydroxyquinoline aluminum (Alq3). The organic layer 16 includes at least a light emitting layer, and the laminated structure may be a single layer to three layers, or the above four layers (hole injection layer, hole transport layer, light emitting layer, electron). It may be five layers in which an electron injection layer is added to the (transport layer), or may be a multilayer.

  Inside the backlight 3, the anode electrode 14, the cathode electrode 15, and the organic layer 16 constitute an organic EL element using the substrate 11 as an element substrate. This organic EL element is transported by the holes injected from the hole injection layer 18 and transported by the hole transport layer 19 and the electron transport layer 21 when a predetermined voltage is applied between the anode electrode 14 and the cathode electrode 15. This is an element that emits light by recombining the emitted electrons in the light emitting layer 20.

  The sealing material 17 is for sealing the wire grid polarizer 13 and the organic EL elements (14, 15, 16) between the two substrates 11, 12. The substrate 11 on which the organic EL element is mounted is bonded to the substrate 12 via, for example, a protective layer and an adhesive layer (not shown).

  Subsequently, a method of manufacturing the backlight 3 having the above-described configuration and the liquid crystal display device 1 including the backlight 3 will be described with reference to FIGS.

  First, a metal film formed by sequentially laminating, for example, molybdenum and aluminum is formed on the surface (one side) of the substrate 11 made of a transparent glass substrate (step S1). For example, when the anode electrode 14 is formed of ITO, the metal film may be formed by sputtering of an aluminum alloy that can be directly connected to the ITO.

  Next, the metal film is etched into a stripe shape by photolithography (step S2). At this stage, the wire grid polarizer 13 is formed on the surface of the substrate 11.

  Next, in order not to fill the gaps between the metal wires 13 </ b> A of the wire grid polarizer 13, for example, ITO is obliquely deposited on the surface of the substrate 11 on which the wire grid polarizer 13 is formed, thereby forming a wire on the substrate 11. An ITO film is formed so as to cover the grid polarizer 13 (step S3a1).

  Next, in order to planarize the ITO film, the surface of the ITO film is polished (step S3a2). At this stage, an ITO anode electrode 14 is formed on the substrate 11 via the wire grid polarizer 13.

  In addition, although it is preferable that it is a space | gap between the metal wires 13A of the wire grid polarizer 13, it does not necessarily need to be a space | gap, for example, it is the said transparent low refractive index material which has a refractive index close | similar to air. The gap may be filled.

Specifically, after forming the wire grid polarizer 13 on the substrate 11, instead of oblique deposition of ITO, silicon dioxide (SiO ₂ ) is embedded in the surface of the substrate 11 so as to fill the gaps between the metal wires 13 </ _b > A. By vapor deposition (film formation), a SiO ₂ film is formed on the substrate 11 so as to cover the wire grid polarizer 13 (step S3b1). As a transparent low refractive index material other than SiO ₂ , for example, a polymer material, fluoride (magnesium fluoride, calcium fluoride, etc.), etc. may be used.

Next, after the SiO ₂ film is polished flat until the surface of the wire grid polarizer 13 is exposed (step S3b2), an ITO film is formed thereon (step S3b3). In this case as well, the ITO anode electrode 14 is formed on the substrate 11 via the wire grid polarizer 13 in the same manner as described above.

  Thereafter, a hole injection layer 18, a hole transport layer 19, a light emitting layer 20, and an electron transport layer 21 are sequentially stacked on the anode electrode 14 of the substrate 11 by, for example, a vacuum deposition method (step S4). At this stage, the four organic layers 16 are formed on the substrate 11 together with the wire grid polarizer 13 and the anode electrode 14. The light emitting layer 20 is formed by laminating layers that emit red, green, and blue light, respectively, in order to obtain white light emission.

  Next, after the cathode electrode 15 is formed on the organic layer 16 by vacuum deposition or the like (step S5), the organic EL element and the wire grid polarizer 13 are sealed using the substrate 12 and the sealing material 17. (Step S6). At this stage, the backlight 3 incorporating the wire grid polarizer 13 is obtained. The term “built-in” described here means that the pair of substrates 11 and 12 are provided in a region where the substrates 11 and 12 face each other, and does not include a state provided on the outer surface side of each of the substrates 11 and 12.

  Thereafter, the backlight 3 is attached to the back side (the side opposite to the display surface) of the liquid crystal display panel 2 in which the polarizing plate 4 is previously attached to the display surface (step S7). At this time, the substrate 11 on the light extraction side of the backlight 3 is opposed to the non-display surface (surface opposite to the display surface) of the liquid crystal display panel 2.

  In the liquid crystal display device 1 obtained by the above manufacturing method, the light emitted from the light emitting layer 20 inside the backlight 3 is transmitted through the anode electrode 14 and incident on the wire grid polarizer 13 and is transmitted therethrough. As a result, the liquid crystal display panel 2 is irradiated from the outer surface of the substrate 11 as linearly polarized light.

  Further, a part of the light emitted from the light emitting layer 20 and the light (returned light) reflected by the wire grid polarizer 13 are reflected by the cathode electrode 15 and incident on the wire grid polarizer 13 and transmitted therethrough. As a result, the liquid crystal display panel 2 is irradiated from the outer surface of the substrate 11 as linearly polarized light.

  Thereby, the light irradiated from the back side of the liquid crystal display panel 2 by the backlight 3 becomes linearly polarized light by the polarization function of the wire grid polarizer 13 built in the backlight 3. For this reason, it is only necessary to attach the polarizing plate 4 only to the display surface on the liquid crystal display panel 2 side. Therefore, the number of external polarizers (polarizing plates) can be reduced to half without incorporating a polarizer in the liquid crystal display panel 2.

  As a result, the member cost concerning a polarizing plate can be reduced. In addition, in the manufacturing process of the liquid crystal display panel 2, the number of polarizing plates attached per panel is reduced from two times to one, which results in poor polarizing plate attachment (such as dust trapping and air bubbles). The rate can be halved. Further, by employing a surface emitting organic EL backlight, it is possible to achieve a reduction in weight and thickness.

  In addition, by bringing the wire grid polarizer 13 built in the backlight 3 into contact with the anode electrode 14, the wire grid polarizer 13 functions as an auxiliary electrode for reducing the resistance of the anode electrode 14. For this reason, the electrical resistance of the anode electrode 14 can be lowered in the Y-axis direction along the metal wire 13A.

  In general, an organic EL element is suitable for being thin and light, but when an organic EL element having a large area for a large television is manufactured, voltage drop due to wiring resistance becomes a problem. As the electrode on the light extraction side of the organic EL element, a transparent conductive film such as ITO or an extremely thin metal film is generally used. For this reason, electric resistance becomes large compared with a metal film electrode having a certain thickness. In particular, when the area is large, the voltage decreases as the distance from the voltage input side decreases, and the number of carriers injected into the element decreases. As a result, it is recognized as luminance unevenness of the organic EL element.

  For this reason, as described above, the wire grid polarizer 13 is made to function as an auxiliary electrode, thereby reducing the electrical resistance of the anode electrode 14, thereby reducing the occurrence of luminance unevenness due to voltage drop particularly in the Y-axis direction. Can do.

  Further, as an application example of the present invention, as shown in FIG. 5, if a configuration in which the metal wires 13 </ b> A of the wire grid polarizer 13 are connected (bridged) by the connecting portion 23 in the X-axis direction is employed, in the X-axis direction. The adjacent metal wires 13A are electrically connected (conducted). The connecting portion 23 is formed integrally with the wire grid polarizer 13.

  For this reason, if the line width of the metal wire 13A which comprises the wire grid polarizer 13 is 50 nm, the line width of the connection part 23 will also be 50 nm. The interval between the connecting portions 23 adjacent in the Y-axis direction is set to a wide interval of about 1 mm, for example. The position where the connecting portion 23 is formed in the Y-axis direction may be set to a position that overlaps, for example, the black matrix of the liquid crystal display panel 2 so that the portion is not recognized or difficult to be recognized when an image is displayed.

  When the structure provided with the connecting portion 23 is employed, the connecting portion 23 functions as an auxiliary wiring for reducing the resistance of the anode electrode 14. Therefore, the occurrence of luminance unevenness due to voltage drop can be reduced not only in the Y-axis direction but also in the X-axis direction. As a result, the backlight 3 with little luminance unevenness can be realized, for example, even for a large area television application.

  FIG. 6 is a cross-sectional view of a backlight according to another embodiment of the present invention. Although the illustrated backlight 3 includes a pair of substrates 11 and 12, a wire grid polarizer 13, an anode electrode 14, a cathode electrode 15, an organic layer 16, and a sealing material 17, although it is common to the above-described embodiment, In addition, a resist portion 24 is provided on the inner surface of the substrate 11, and the wire grid polarizer 13 is formed on the resist portion 24.

  The resist portion 24 is formed in a concavo-convex shape so as to form a continuous cross section in the direction in which the metal wires 13A of the wire grid polarizer 13 are arranged. The surface of the resist portion 24 is formed in a corrugated shape corresponding to the wire interval of the wire grid polarizer 13 when viewed in plan.

  On the other hand, the metal wire 13A of the wire grid polarizer 13 is formed immediately above the top of the resist portion 24 having a chevron cross section. For this reason, the end portion (upper end portion) of the wire grid polarizer 13 on the light emitting layer 20 side is inclined in a tapered shape following the top shape of the resist portion 24. Thereby, the edge part by the side of the light emitting layer 20 of the wire grid polarizer 13 is formed in the state inclined diagonally with respect to the electrode surface of the cathode electrode 15 arrange | positioned on the opposite side to the light extraction side.

  FIG. 7 is a flowchart illustrating a backlight and a method for manufacturing a liquid crystal display device including the backlight according to another embodiment of the present invention.

  First, a resist is applied to the surface (one side) of the substrate 11 made of a transparent glass substrate to form a resist film (step S11), and then the resist film is patterned into irregularities by photolithography (step S12). At this stage, the resist portion 24 is formed on the surface of the substrate 11.

  Next, a metal film formed by sequentially laminating, for example, molybdenum and aluminum is formed on the surface (one surface) of the substrate 11 so as to cover the resist portion 24 (step S13). In this case, the surface of the metal film is formed in an uneven shape following the surface shape of the resist portion 24 serving as a base. For example, when the anode electrode 14 is formed of ITO, the metal film may be formed by sputtering of an aluminum alloy that can be directly connected to the ITO.

  Next, the metal film is etched into a stripe shape by photolithography (step S14). At this stage, the wire grid polarizer 13 is formed on the surface of the substrate 11.

  Next, in order not to fill the gaps between the metal wires 13 </ b> A of the wire grid polarizer 13, for example, ITO is obliquely deposited on the surface of the substrate 11 on which the wire grid polarizer 13 is formed, thereby forming a wire on the substrate 11. An ITO film is formed so as to cover the grid polarizer 13 (step S15).

  Next, in order to flatten the ITO film, the surface of the ITO film is polished (step S16). At this stage, the anode electrode 14 is formed on the substrate 11 via the resist portion 24 and the wire grid polarizer 13.

  Thereafter, a hole injection layer 18, a hole transport layer 19, a light emitting layer 20, and an electron transport layer 21 are sequentially stacked on the anode electrode 14 of the substrate 11 by, for example, a vacuum deposition method (step S17). At this stage, the four organic layers 16 are formed on the substrate 11 together with the wire grid polarizer 13 and the anode electrode 14. The light emitting layer 20 is formed by laminating layers that emit red, green, and blue light, respectively, in order to obtain white light emission.

  Next, after the cathode electrode 15 is formed on the organic layer 16 by vacuum deposition or the like (step S18), the organic EL element and the wire grid polarizer 13 are sealed using the substrate 12 and the sealing material 17. (Step S19). At this stage, the backlight 3 incorporating the wire grid polarizer 13 is obtained.

  Thereafter, the backlight 3 is attached to the back side (the side opposite to the display surface) of the liquid crystal display panel 2 in which the polarizing plate 4 is previously attached to the display surface (step S20). At this time, the substrate 11 on the light extraction side of the backlight 3 is opposed to the non-display surface (surface opposite to the display surface) of the liquid crystal display panel 2.

  In the liquid crystal display device 1 obtained by the above manufacturing method, the following effects are obtained in addition to the effects as in the above-described embodiment. That is, when a part of the light emitted from the light emitting layer 20 is reflected by the wire grid polarizer 13, the reflected light generated there goes to the cathode electrode 15 as return light.

  In this case, if the end of the wire grid polarizer 13 is parallel to the electrode surface of the cathode electrode 15, the light reflected by the wire grid polarizer 13 goes straight to the cathode electrode 15 and is reflected again by the electrode surface. Will do. For this reason, reflection of light is repeated between the wire grid polarizer 13 and the cathode electrode 15. Therefore, a part of the light emitted from the light emitting layer 20 is confined in the backlight 3, and the light extraction efficiency is lowered accordingly.

  On the other hand, when the end of the wire grid polarizer 13 is inclined obliquely with respect to the electrode surface of the cathode electrode 15, the light reflected by the wire grid polarizer 13 is obliquely applied to the electrode surface of the cathode electrode 15. . For this reason, no light is trapped inside the backlight 3. Therefore, the light emitted from the light emitting layer 20 can be efficiently extracted from the backlight 3.

  Although not shown, the end of the cathode electrode 15 on the side of the light emitting layer 20 is formed to have a fine unevenness on the order of several nm, for example, and scattering of the reflected light (random reflection) occurs at the uneven portion. By the same principle as described above, it is possible to avoid light confinement and to efficiently extract light from the backlight 3.

1 is a perspective view illustrating a schematic configuration of a transmissive liquid crystal display device to which the present invention is applied. It is sectional drawing of the backlight which concerns on embodiment of this invention. It is a disassembled perspective view of the backlight which concerns on embodiment of this invention. It is a flowchart explaining the manufacturing method of the backlight which concerns on embodiment of this invention, and a liquid crystal display device provided with the same. It is a figure explaining the application example of this invention. It is sectional drawing of the backlight which concerns on other embodiment of this invention. It is a flowchart explaining the manufacturing method of the backlight which concerns on other embodiment of this invention, and a liquid crystal display device provided with the same.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 2 ... Liquid crystal display panel, 3 ... Back light, 4 ... Polarizing plate, 11, 12 ... Board | substrate, 13 ... Wire grid polarizer, 13A ... Metal wire 13A, 14 ... Anode electrode, 15 ... Cathode electrode , 16 ... Organic layer, 18 ... Hole injection layer, 19 ... Hole transport layer, 20 ... Light emitting layer, 21 ... Electron transport layer, 23 ... Connection part, 24 ... Resist part

Claims (6)

A pair of substrates with one side being the light extraction side;
It said pair of Rutotomoni provided on the inner surface side of the substrate of the light extraction side of the substrate, and the wire grid polarizer in which a plurality of metal wires, which are arranged in parallel,
Have a light emitting layer provided in a state of the wire grid polarizer and facing between the pair of substrates,
The backlight whose cross-sectional shape of the edge part by the side of the said light emitting layer of each metal wire of the said wire grid polarizer is a mountain shape . Between the light extraction side substrate and each metal wire, the cross-sectional shape has a mountain-shaped resin layer,
  Each metal wire is formed following the shape of the top of the resin layer
  The backlight according to claim 1. The EML Ru organic light-emitting layer der contained in the organic layer
The backlight according to claim 1 or 2 . A pair of electrodes sandwiching the organic layer between the pair of substrates;
That have pre Kiwa ear grid polarizer is provided in a state of contact with the surface of the light extraction side electrode of the pair of electrodes
The backlight according to claim 3 . The wire grid polarizer is
Wherein the plurality of metal wires are found side by side at equal intervals in a predetermined direction,
A connecting part for connecting the metal wires to each other is provided.
The backlight according to claim 4 . A liquid crystal display panel;
A backlight that emits light from the back side of the liquid crystal display panel,
The backlight, one a pair of substrates and the light extraction side, the provided on the inner surface side of the substrate of the light extraction side of the pair of substrates Rutotomoni, wire plurality of metal wires, which are arranged parallel grid a polarizer, and a light emitting layer, wherein provided in a state of the wire grid polarizer and facing between the pair of substrates possess,
The liquid crystal display device whose cross-sectional shape of the edge part by the side of the said light emitting layer of each metal wire of the said wire grid polarizer is a mountain shape .

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