JP2001100646A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device driven by a field sequential system. SOLUTION: An organic EL element is used as a back light 100 of the liquid crystal display device of the field sequential system. The back light 100 is formed by dispersedly arranging organic EL regions 109r, 109g and 109b which respectively emit light to red(R), green(G) and blue(B) in a stripe form. The back light 100 is so formed that the respective organic EL regions 109r, 109g and 109b may be independently driven by each of the respective light emission colors. As a result, the back light which is capable of switching the light emission colors of R, G and B at a high speed and is adequate for the field sequential system is obtained. The reduction in the thickness of the liquid crystal display device of the field sequential system and the electric power consumption are made possible by using such back light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a liquid crystal display device driven by a field sequential system using an organic EL element as a backlight.

[0002]

2. Description of the Related Art In recent years, a liquid crystal display device using a field sequential system has attracted attention. A full-color display system using a liquid crystal display device includes a spatial mixing system and a time difference mixing system, and the latter is called a field sequential system.

[0003] The spatial mixing method is based on an additive color mixture in which light in the red (R), green (G), and blue (B) wavelength regions is superimposed. These colors are arbitrarily mixed by changing the brightness of each pixel and obtaining the desired color light. In addition, a color filter is generally used in the LCD of the spatial mixing method.

On the other hand, the field sequential system is a color display system utilizing color mixture by "time division". That is, when the light of two or more colors is continuously switched to emit light, and the switching speed is set to a speed exceeding the temporal resolution of the human eye, the human can change the two or more colors described above. This is a method that applies recognition by mixing colors.

In the field sequential type full-color LCD, the backlight can emit light of one of the three emission colors of R, G, and B for each field in displaying a moving image. R, G, and B emission colors are continuously switched for each field to emit light (in a time-division manner), and the switching speed is made sufficiently fast to obtain any color light. That is, in a full color LCD of the field sequential system, for example, each color field is divided into an R field, a G field, and a B field in advance, and one color field is divided. When displaying, the above-described RGB fields are displayed on the LCD with a time difference in order, and when displaying the R field,
The backlight emission is set to red (R), and when displaying the B field, the backlight emission is set to blue (B).
When displaying the G field, the light emission of the backlight is set to green (G). In the LCD, a color moving image can be displayed by continuously displaying each color field composed of the three color fields time-divided as described above while switching the three emission colors. ing.

In a full-color LCD other than the field sequential system, a color filter is generally used. However, when a color filter is introduced, light from the backlight is largely absorbed by the color filter. In the field sequential method that does not require a color filter, power consumption for loss of light absorbed by the color filter can be suppressed, and power consumption can be reduced as compared with a conventional LCD. Further, the color filter is expensive among the member costs of the color liquid crystal display panel, and the cost can be greatly reduced by eliminating the color filter.

In the field sequential system, it is necessary to switch each field between R, G, and B sufficiently quickly to emit light. Therefore, both the backlight and the liquid crystal display panel constituting the LCD are of the conventional LCD. It is necessary to be able to respond at high speed as compared with the ones. That is, the image flickers due to color switching (flicker)
In order to prevent the occurrence of
It is said that it is necessary to switch within 0 seconds. Therefore, to display one color per field, about 1 /
It is necessary to switch in 180 seconds or less, that is, in 6 ms or less. Furthermore, in this field, it is necessary to write the image, respond to the liquid crystal, and turn on the backlight.
The liquid crystal display panel is required to be driven at a higher speed. Therefore, it is said that a ferroelectric liquid crystal or an anti-ferroelectric liquid crystal is advantageous as a liquid crystal display panel in that a high-speed response is possible. Among nematic liquid crystals, an OCB liquid crystal having a response speed 10 times that of a TN liquid crystal has been proposed. As described above, with respect to the liquid crystal display panel, development of a liquid crystal display panel capable of high-speed response has been advanced.

[0008]

By the way, for the backlight of the field sequential system, it is conceivable to use a cold cathode tube or an LED used in a conventional backlight. In the past, cold cathode tubes were required to have a long afterglow time in order to obtain flicker-free white light. There is a problem that short time is required. In addition, LED
In recent years, blue light-emitting LEDs have been mass-produced in recent years, and it is considered that a backlight of three colors of RGB can be manufactured.

On the other hand, one of the main uses of LCD is as follows.
It is used as a display of a portable small and lightweight electronic device. In this case, it is desired to reduce the thickness of the backlight in order to reduce the size of the electronic device and to reduce the power consumption of the backlight in order to extend the driving time when the battery is driven in a portable mode. Become.

Therefore, a backlight used for a field sequential type LCD has a high-speed response which can sufficiently cope with the field sequential type, and
Although a structure that can be made thin and that can be driven with low power consumption are required, a field-sequential liquid crystal display device having a backlight satisfying these conditions has not yet been obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been made in view of a field using an organic EL element which can switch light emission of each color of RGB at a high speed, is thin, and has low power consumption as a backlight. It is an object to provide a sequential liquid crystal display device.

[0012]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal display panel driven by a field sequential system; and a backlight provided on the back side of the liquid crystal display panel. In the above-mentioned backlight, two or more kinds of organic EL regions emitting light of different colors are arranged on a transparent substrate so as to be dispersed for each type, and sequentially emit light of different colors. The feature is that it is possible.

According to the above configuration, in the backlight provided on the back surface of the liquid crystal display panel, two or more types of organic EL regions emitting different colors are separated from each other by organic EL regions emitting different colors. If the organic EL regions having different emission colors can be turned on and off independently of each other, the display can be switched between substantially planar emission of different emission colors. it can.

For example, an organic EL region for emitting light is provided independently for each of R, G, and B, and electrodes for supplying a current for causing the organic EL region to emit light are divided at least for each of R, G, and B. If light emission can be performed individually for each color by, for example, providing a configuration capable of supplying electric power, uniform planar light emission is performed by switching the three emission colors of R, G, and B in the backlight. be able to.

Here, the organic EL element has an extremely small capacitance and can be switched at high speed. Therefore, the light emission of each color of RGB can be switched at a high speed, and compared with a fluorescent tube using a fluorescent material having an afterglow property, an extremely thin backlight suitable for a liquid crystal display device driven by a field sequential method. Functions as a light.

Further, the light emission from the backlight is
When guided to the liquid crystal display panel driven by the field sequential method, the full color liquid crystal display device of the present invention functions. Here, it is preferable to use a well-known liquid crystal display panel capable of high-speed response as the liquid crystal display panel. For example, a liquid crystal formed of a ferroelectric liquid crystal or an anti-ferroelectric liquid crystal may be used.

According to a second aspect of the present invention, there is provided a liquid crystal display device comprising:
2. The liquid crystal display device according to claim 1, wherein the organic EL region of the backlight is formed in a stripe shape, and the organic EL region includes an organic EL layer and an anode and a cathode arranged so as to sandwich the organic EL layer. And a partition portion for separating each organic EL layer is formed along the stripe-shaped organic EL region between the organic EL layers in each organic EL region on the transparent substrate. The organic EL layer is formed in a stripe shape by injecting a material for the organic EL layer therebetween.

According to the above configuration, since the organic EL regions are arranged in a stripe shape, each organic EL region has a substantially linear shape (band shape). When each of the organic EL regions emits light, each of the organic EL regions becomes a substantially linear light source, and the light spreads in a band shape as the distance from each of the organic EL regions increases. It will overlap with the spreading light emission. In addition, since the partition part separating each organic EL layer between the organic EL layers in each organic EL region on the transparent substrate is formed along the stripe-shaped organic EL region, the organic EL layer, When forming the anode and the cathode, the above-mentioned partition can be used. For example, if a liquid material of the organic EL layer is injected between the partition portions, a stripe-shaped light emitting layer can be easily formed. Further, when the cathode thinner than the partition is formed in a planar shape on the transparent substrate on which the partition is formed after the partition is formed, the cathode is disconnected at the partition due to a step due to the thickness of the partition. Thus, even if the cathode is formed in a planar shape, the cathode can be an independent electrode for each organic EL region. As described above, for use as a backlight of a liquid crystal display device driven by a field sequential method, for example, RGB
It is necessary to sequentially switch to the respective colors to enable light emission. For this purpose, it is necessary to adopt a configuration in which a voltage can be applied independently for each organic EL region of each emission color. However, by arranging each organic EL region in a stripe shape, another configuration (each organic EL region is (For example, when the organic EL regions are arranged in a mosaic shape or each organic EL region is finely dispersed as a small planar shape), the number of lead lines for supplying power to each organic EL region for each of the RGB colors is minimized. In this way, it is possible to very simply apply a voltage independently to each of the organic EL regions of each of the RGB colors. At the same time, by arranging the organic EL regions in a stripe shape, the production can be performed more easily than in other methods.

Then, the organic EL layer and the cathode are in a state of being patterned based on the precision of the pattern formation of the partition walls, and the interval (pitch) between the stripe-shaped organic EL regions can be reduced. Become. When obtaining planar light emission from a striped light source, the distance between the striped light sources needs to be sufficiently short with respect to the viewing distance. In other words, in order to make the transparent substrate disposed between the liquid crystal display panel and the striped light source thinner, the distance between the striped light sources needs to be sufficiently short. Therefore, in order to make the backlight thinner, it is necessary to reduce the pitch between the organic EL regions formed in a stripe shape. Conversely, the pitch between the organic EL regions formed in a stripe shape is reduced. By
Further, the backlight can be made thinner.

The partition is made of, for example, a known photosensitive resin, and is preferably one that can be patterned by photolithography. Further, it is preferable that the partition portion is insulative. The thickness of the partition is preferably 5 μm or more in order to inject the liquid material of the organic EL layer between the partition and to disconnect the cathode as described above. Further, the partition wall portion is basically formed between the stripe-shaped organic EL regions.
Since the partition walls are formed along the stripe-shaped organic EL regions, the partition walls are also basically formed in a stripe shape.

In order to surely separate each organic EL region by the partition, it is preferable that the partition is formed so as to surround the periphery of the organic EL region. It is preferable that the openings serving as the organic EL regions are formed in a stripe shape. In addition, in the case where the stripe-shaped opening is formed in the planar partition as described above, if only the portion corresponding to the organic EL region is viewed, the partition is stripe-shaped, and the organic EL regions are connected to each other. During this time, the state is formed along the organic EL region. Further, in some cases, the partition portion is not in a state in which a large number of openings are formed in a stripe shape in a planar partition portion, but in a state in which one end of each opening is opened, that is, in a comb-like state. good. When the organic EL layers of each emission color are arranged in a stripe, it is preferable that uniform RGB light from a backlight is guided to the liquid crystal display panel of the liquid crystal display device.
It is preferable that the distribution of each type of organic EL region is substantially the same in each organic EL region that emits light in the same manner. That is, it is preferable that the same type of organic EL layers are arranged at substantially constant intervals, and a large number of sets of organic EL layers each including one of each type of organic EL layer are arranged in a stripe shape. Is preferred. Also, more uniform RGB
In order to obtain light emission of the same color, the distance between the stripes emitting light of the same color (each organic EL region emitting light of the same color) is the distance to be viewed (the distance to the liquid crystal display panel illuminated when used as a backlight). It is desirable that the width is sufficiently narrow with respect to ()). Each organic EL region basically includes an anode, a cathode, and an organic EL layer. However, if each of the organic EL regions emits light linearly, the anode, the cathode, and the organic EL layer may be used. It is not necessary that all of the EL layers have a stripe shape, and at least one of the anode and the cathode may be formed in a planar shape and may be formed over a plurality of organic EL regions.

According to a third aspect of the present invention, there is provided a liquid crystal display device comprising:
3. The liquid crystal display device according to claim 1, wherein the anode is formed on the glass substrate as a transparent common electrode in a planar shape over each organic EL region, and the stripe-shaped organic EL is formed on the anode. A layer is formed, a low-resistance wiring having a lower resistance than the anode is formed between the organic EL layers, and the low-resistance wiring is covered on the low-resistance wiring. And a cathode portion is formed on the organic EL layer as an independent electrode for each organic EL region or for each organic EL region of the same type.

According to the above configuration, since a low-resistance wiring having a lower resistance than the anode is formed between the organic EL layers, the sheet resistance of the entire anode electrode is reduced, and planar light emission with uniform luminance is achieved. Obtainable. Also,
Since the organic EL layers are arranged in a stripe pattern, there is a gap between the organic EL layers, and a low-resistance wiring is formed in a gap other than the light emitting region. Can emit light with high luminance even if it is opaque. In addition, it is preferable that a low-resistance wiring is connected to a power supply instead of the transparent electrode, and a current flows from the low-resistance wiring to the transparent electrode. Also, rather than forming wiring on a glass substrate by ITO,
By performing the wiring with a low-resistance wiring having a resistance value lower than that of O, power consumption can be reduced.

Further, according to the present invention, on the glass substrate,
The anode is formed as a transparent common electrode in a plane shape over each organic EL region, and a low-resistance wiring having a lower resistance than the anode is formed between the organic EL layers on the anode. Therefore, the low-resistance wiring and the anode are reliably short-circuited. Further, a low-resistance wiring having a lower resistance than the anode is formed between the organic EL layers on the anode, and the low-resistance wiring and the organic EL layer are formed apart from each other. Injection of carriers into the layer takes place from the anode. For this reason, the light emitting region overlaps with the anode, and even if the low resistance wiring is opaque, the low resistance wiring does not hinder the emission of light from the organic EL layer, and the luminance of the backlight is reduced by the low resistance wiring. It can be prevented from lowering.

That is, ITO generally used as an anode has a high resistance as an electrode.
If the organic EL layer is formed over a long distance from the power supply connection portion, the current flowing through the organic EL layer decreases as the distance from the power supply connection portion increases due to the resistance of the ITO, and the luminance also decreases. Such a situation can be prevented by using a low-resistance wiring as described above. In the case where the low-resistance wiring and the organic EL layer are formed apart from each other on the anode, and the low-resistance wiring is formed along each organic EL layer, the low-resistance wiring is formed of at least each organic EL layer. They are formed between the EL layers. Further, when the organic EL layer covers the entire anode, there is no place for forming the low-resistance wiring, so that the anode is formed so as to protrude around the organic EL layer. Must be
It is preferable that the anode is formed in a planar shape over each organic EL layer and serves as a common electrode common to each organic EL layer.

According to a fourth aspect of the present invention, in the liquid crystal display device according to the first aspect, the organic EL region is an organic EL device.
An L layer, and a first electrode and a second electrode for allowing a current to flow through the organic EL layer, wherein the organic EL layer has a charge transport region that is partially provided on a transparent substrate. And the other part of the charge transport region is formed so as not to overlap with the first electrode.

According to the above configuration, light emitted through the other part of the charge transport region can be emitted without passing through the first electrode. Therefore, light absorption loss is small, so that high power consumption and low luminance can be achieved. Can emit light. In other words, basically, the organic EL layer is applied with a voltage in a state sandwiched between an anode (for example, a first electrode) and a cathode (for example, a second electrode) to allow a current to flow. To extract light from the organic EL layer sandwiched between
The anode must be a transparent electrode. However, since the transparent electrode also absorbs light to some extent, when the first electrode is, for example, a transparent electrode, light emitted through the other part of the charge transport region can be emitted without passing through the first electrode. Therefore, the luminance can be improved. Further, in this case, even if the first electrode is not a transparent electrode, light of the organic EL layer can be emitted from the other part of the charge transport region, and light can be emitted without using the transparent electrode. Become. Then, for example, the anode (here, the first electrode) overlaps a part (for example, a side edge) of each of the stripe-shaped organic EL layers so that electric charge can be applied to the stripe-shaped organic EL layer. In addition, if the anode is formed so as not to overlap with the portion (the center along the length direction) of each organic EL layer except for the above-mentioned part, the anode is formed in relation to the back electrode. , Organic E
Light is incident on the transparent substrate without passing through the anode from a portion where the current flows between the anode and the back electrode of the L layer and does not overlap with the anode.
Therefore, even if the first electrode is opaque, light emitted from the organic EL layer can be extracted to the outside. If the first electrode is made opaque, the choice of the conductive material that can be used as the first electrode is expanded, for example, metal (including alloy)
Can be used. When a metal or other conductive material having a lower resistivity than ITO is used as the first electrode, the sheet resistance of the entire first electrode is easily reduced as compared with the case where ITO is used, and the surface light emission with uniform brightness is achieved. Can be obtained.

If the first electrode is made of metal or a material having lower resistance and flexibility than ITO, instead of ITO, the first electrode can respond to deformation of the film substrate. For example, if a metal is used as the first electrode, it is not brittle like ITO, but has a certain degree of flexibility and the like, so that it has excellent compatibility with the transparent film substrate, and the flexibility and flexibility of the transparent film substrate. A manufacturing method and a use method that make use of characteristics can be easily applied. In the present invention, since the first electrode is made of an opaque and low-resistance conductive member, the resistance of ITO is high,
Problems due to brittleness and the like can be solved. And
The yield can be improved by changing the first electrode from a brittle ITO to a conductive material such as a metal.

Further, if a metal or a material having lower resistance and flexibility than ITO is used instead of ITO as the first electrode, the first electrode can cope with deformation of the film substrate. For example, if a metal is used as the first electrode, it is not brittle like ITO but has a certain degree of flexibility and the like. A manufacturing method and a use method that make use of characteristics can be easily applied. By changing the first electrode from a brittle ITO to a conductive material such as a metal, the durability can be improved. Further, in the above configuration, when the first electrode is made of an opaque conductive material such as a metal, light does not pass through the portion where the organic EL layer and the first electrode overlap, and the organic EL layer and the first electrode do not pass through. In the part where does not overlap, the organic EL
If the sheet resistance of the charge transport layer of the layer is high, current does not always flow through the entire portion. However, organic EL
In a portion where the layer is exposed from the organic EL layer, light can be emitted without passing through a member having relatively low light transmittance such as ITO. From these facts, it is preferable that the shape of the first electrode is such that current flows through almost the entire organic EL layer in a state where it does not overlap with the second electrode contributing to light emission as much as possible.

In the present invention, since each of the organic EL layers can be formed in a band shape close to a linear shape, for example, the first electrode overlaps with the side edge along the length direction of the organic EL layer, If it is formed from one end to the other end of the organic EL layer, the area where the organic EL layer and the first electrode overlap can be minimized, and a current can flow through almost the entire organic EL layer. . Therefore, in this way, it is possible to improve the brightness as compared with the case where the first electrode made of ITO having a low light transmittance is transmitted as in the related art. The first electrode is preferably formed so as to overlap the left and right side edges of the organic EL layer in order to make the current flow as uniformly as possible throughout the organic EL layer. When the first electrode is a common electrode, it is preferable that the first electrode have a comb-like or stripe-like opening.
With such a configuration, the first electrode can be easily overlapped only on the side edge of the organic EL layer.

The shape of the portion where the first electrode and the organic EL layer overlap each other is such that the first electrode overlaps the side edge of the organic EL layer as described above.
If the electrodes are overlapped, one or two lines (thin strips) can be formed. However, the shape of the portion where the first electrode and the organic EL layer overlap is not necessarily limited to the above-described one. For example, the shape of the frame is such that the first electrode overlaps the entire periphery of the organic EL layer. Or a plurality of substantially linear first electrodes extending from one side edge to the other side edge of the organic EL layer are arranged to form a stripe, or the above-mentioned line and stripe are combined to form a ladder. Alternatively, the portion where the first electrode and the organic EL layer overlap may not necessarily be continuous. Further, as long as the first electrode can be formed thinner, the first electrode may be linearly arranged along the organic EL layer in the strip-shaped organic EL layer, or may be arranged in a mesh shape. good.

It is preferable that at least one charge transport layer of the organic EL layer has a sheet resistance of 10 Ω / □ or less, and the sheet resistance is low enough for the charge transport layer to transport charges in a plane. The organic EL layer can emit light in a wide area without completely overlapping the first and second electrodes in a plane via the EL layer. Further, a diffusion surface for diffusing light may be formed on the surface of the portion acting as a reflector on the back surface or on the surface of the transparent substrate. In this case, the organic EL layer emits more light than the transparent substrate. From the surface.

The first electrode has a resistivity of 2 × 10
It is preferably ^-4 Ωcm or less. By using a material having a low resistivity as described above, the sheet resistance of the first electrode can be reduced even when the first electrode is formed to be thin, so that the throughput can be improved. Similarly, since the sheet resistance can be reduced even when the width of the first electrode is reduced, light can be emitted at a fine pitch, so that the backlight can be made thinner as described above.

An organic EL device according to a fifth aspect of the present invention comprises:
2. The liquid crystal display device according to claim 1, wherein the organic EL region is formed on a transparent substrate, and light emitted in response to a current flowing therein is emitted to the transparent substrate side; An anode formed on the organic EL layer; and a cathode formed on the organic EL layer so as to be separated from the anode.

According to the above configuration, the light emitted from the organic EL layer can be emitted without passing through the anode, so that the light can be emitted with high power and low power consumption because of little loss of light. Here, the anode and the cathode are not arranged so as to sandwich the organic EL layer from above and below, but the anode and the cathode are arranged on the surface of the organic EL layer formed on the transparent substrate opposite to the transparent substrate. Has been
In the organic EL layer, the organic E
A current flows along the plane direction of the L layer.

The organic EL layer includes at least a hole transport layer and an electron transport layer. The anode is provided in contact with the hole transport layer, and the cathode is provided in contact with the electron transport layer. It is necessary that holes move from the hole transport layer toward the electron transport layer, and that electrons move from the electron transport layer toward the hole transport layer. Therefore, when the anode and the cathode are provided on one side of the organic EL layer, the hole transport layer is exposed at the portion where the anode is provided on one side of the organic EL layer, and the electron transport layer is exposed at the portion where the cathode is provided. It must be in a state where it has been done. Then, the hole transport layer and the electron transport layer need to be in contact with each other or to be arranged via the light emitting layer.

For example, providing a narrow electron transport layer or a hole transport layer on a wide hole transport layer or an electron transport layer, that is, a narrow charge transport layer on a wide charge transport layer Is provided, a portion of the wide charge transport layer that does not overlap with the narrow charge transport layer is exposed on one side of the organic EL layer, so that the electron transport layer and the holes are formed on one side of the organic EL layer. Both the transport layer and the transport layer can be exposed.

In such a configuration, for example, the first electrode is formed in a portion of the above-described wide charge transport layer that does not overlap with the narrow charge transport layer, and the narrow charge transport layer is formed. For example, a second electrode is provided on the layer, and in a wide charge transport layer, a current flows in a plane direction between a portion overlapping the first electrode and a portion overlapping the narrow charge transport layer. become. Therefore, in a wide charge transport layer, that is, at least one of the plurality of organic charge transport layers included in the organic EL layer, the sheet resistance is preferably low, for example, the sheet resistance is 10 ⁸ Ω /. □ It is preferably not more than. The anode and the cathode are preferably made of the same material in order to simplify the manufacturing process. At this time, it is preferable that the anode and the cathode have a high light reflectance as a back electrode.

The organic EL device according to the sixth aspect is the first aspect of the invention.
In the liquid crystal display device described above, the organic EL region is formed on an anode formed on a transparent substrate, and the organic EL region is formed on the anode, is capable of transporting charges in a plane direction, and is part of an organic EL layer. (1) a charge transport layer, a second charge transport layer formed on the first charge transport layer and being a part of the organic EL layer, and on the second charge transport layer so as not to overlap the anode in a plane. And a formed cathode.

The above-mentioned organic EL device is capable of transporting charge to the entire second charge transport layer without having to overlap the anode and the cathode in a plane because the charge transport in the direction of the first charge transport layer is free. Light can be emitted in a wide range.
That is, in the configuration according to claim 5, the anode and the cathode are provided on one side of the organic EL layer. In this configuration, the anode provided on the opposite side of the organic EL layer from the transparent substrate is connected to the transparent substrate side. The same effect as that of the structure described in claim 5 can be obtained even if it is provided on the surface.

That is, when the first charge transport layer has a structure in which a current flows in the plane direction, the anode is an organic EL.
It may be formed on either side of the layer. Further, the anode is provided on the transparent substrate side of the organic EL layer from which light is emitted. However, in the above configuration, for example, the width of the first charge transport layer is wider than the width of the second charge transport layer, a cathode is formed on the second charge transport layer, The anode is formed at a position that does not overlap, that is, a position that does not substantially vertically overlap the second charge transport layer on which the cathode of the first charge transport layer is formed. The light emitting portion of the organic EL layer is basically a portion where the hole transport layer, the electron transport layer, and the (first charge transport layer and the second charge transport layer) are vertically arranged. Further, since the anode is arranged so as not to substantially overlap with this portion, even if the anode is on the transparent substrate side of the organic EL layer, the anode is not much affected by the anode in the same manner as in the first to fourth aspects. Then, light can be emitted from the transparent substrate side of the organic EL layer. Therefore, the anode does not need to be a transparent electrode as in the case of the above-mentioned respective claims, and a low-resistance metal electrode or the like can be used. It is preferable that the sheet resistance of the first charge transporting layer is low as in the case of the fifth aspect.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display device (sometimes abbreviated as LCD) according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a cross section of a main part of an LCD comprising a liquid crystal display panel and a backlight. As shown in FIG. 1, the LCD of the first example includes a backlight 100 and a liquid crystal display panel 200.

The liquid crystal display panel 200 is a well-known T
This is a liquid crystal display panel for a field sequential system driven at high speed by the FT system. In the liquid crystal display panel, a liquid crystal layer 206 is sandwiched between two transparent substrates 202 and 202 (for example, a glass substrate or a transparent film substrate) each having a polarizing plate 201 on an outer surface side. On the lower transparent substrate 202, a pixel electrode 204 and a thin film transistor (TFT) 203 are formed. This is the same as the well-known configuration in the TFT system. Data lines 210 and scanning lines are arranged in a matrix on a transparent substrate 202, and a TFT 203 and a pixel electrode 204 are arranged at the intersection of the data lines 210 and the scanning lines. Is arranged. Above these, an alignment film 205 is formed,
Above it is a liquid crystal layer 20 made of a liquid crystal material capable of high-speed response.
6 is enclosed. The liquid crystal layer 206 includes the upper and lower alignment films 2.
It is enclosed between 05. In the liquid crystal layer 206,
A spacer 208 is disposed, and a seal 20 is provided at an end.
9 are formed. Spacer 208, seal 209,
A space for enclosing the liquid crystal layer 206 is formed by the alignment film 205. The liquid crystal display panel 200 has no color filter.

In the liquid crystal display panel 200, a full-color image is displayed by a field sequential method, and therefore, a liquid crystal display panel capable of high-speed response is required. In this example, a well-known ferroelectric liquid crystal or anti-ferroelectric liquid crystal is used. It is assumed that a liquid crystal display panel 200 capable of high-speed response using a dielectric liquid crystal is used. Further, an OCB liquid crystal may be used.

Next, referring to FIG. 1, FIG. 2 and FIG. 3, a backlight 10 of an LCD according to a first embodiment of the present invention
0 will be described. In FIG. 2, the organic EL
Layers (103r, 103g, 103b) and conductive layers 110, 110r, 110g, 110 obtained by curing the conductive paste.
b is shown, for example, in a transparent state as an oblique lattice pattern, and is shown in a transparent state through the cathode 104. In FIG. 3, the organic EL layers (103r, 103g, 103) are shown.
b), the partition resist 108 is shown in a transparent state as, for example, an oblique lattice pattern or a horizontal lattice pattern, and the cathode 104 and the conductive layers 110, 110r, 110
g and 110b are omitted. 2 and 3 illustrate the same first example backlight 100. FIG.

As shown in FIGS. 1, 2 and 3, the backlight 100 of the LCD of the first example is formed on a transparent substrate 101 (for example, a glass substrate or a transparent film substrate) in a stripe shape (strip shape). An anode 102 made of ITO (transparent electrode) and a cathode terminal 111 electrically separated from the anode 102 and made of the same material as the anode 102 are formed on the transparent substrate 101 and the anode 102. A partition resist 108 made of an insulating material and having an opening 108a whose center is opened is formed. Striped organic EL layers (103r, 103g, 103g) are formed on the anode 102 exposed through the opening 108a along the anode 102.
3b) are formed, and a barrier resist 108 is formed thereon.
A cathode 104 serving as a back electrode made of a material having a well-known low work function is provided on the upper and peripheral transparent substrates 101.
Are deposited according to each step. And
One anode 102, one organic EL layer (103r, 103g, 103b) overlapping the anode 102, and one of the organic EL layers (103
r, 103g, 103b) to form one organic EL region (109
r, 109g, 109b) are formed. As a result, the backlight 100 shown in FIG. 2 has stripe-like organic EL regions (109r, 109g, 109b).
Are formed. FIGS. 2 and 3 schematically show the backlight 100 of the first example. Actually, three organic Es whose emission colors are red, green, and blue, respectively, are shown.
L regions (109r, 109g, 109b) are formed in a belt shape in parallel with each other, and a large number of organic EL regions (109r, 109g, 109b) each of which is a set of these three are arranged in parallel with each other.

Each anode 102 is an organic EL of each emission color.
The length is different for each region (109r, 109g, 109b), the other end of each anode 102 on the cathode terminal 111 side is aligned, and one end is provided for each emission color. They are located at different positions (those having the same emission color are aligned). For example, the anode 102 of the organic EL region 109r emitting red light has one short end, and the anode 102 of the organic EL region 109b emitting blue light has
Organic EL region 109g with one end long and emitting green light
The anode 102 has a length between the two anodes 102 described above. That is, the anode 1 for each emission color
The position of one end of the anode 102 is changed, and the position of one terminal of the anode 102 of the same emission color is arranged substantially on a straight line substantially orthogonal to the length direction of the anode 102. Then, on the transparent substrate 101 on the side of all the anodes 102, the organic EL regions (109
r, 109g, and 109b) of the anode terminals 102r and 102 corresponding to the number of light emission color types (here, three).
g, 102b are formed from ITO.

The anode terminals 102r, 102g, 1
02b is formed simultaneously when the anode 102 and the cathode terminal 111 are formed, and the position thereof corresponds to the position of one end of the anode 102 for each emission color, and corresponds to the same emission color. Anode terminal 102r,
102g, 102b and one end of the anode 102 are arranged on a line substantially orthogonal to the length direction of the anode 102. As will be described later, the partition wall resist 108 has openings 112 a at positions corresponding to one end of each of the anodes 102 so that the ends are exposed.
Are formed.

Then, as shown in FIG. 2, each conductive layer 1
10r, 110g, and 110b are connected to the anode terminals 102r, 102g, and 102b corresponding to the same luminescent color, and connected to one end of the anode 102 corresponding to the same luminescent color through the opening 112a. Has become. That is, the organic EL region 10 in which the emission color is red
All the anodes 102r of 9r and the anode terminal 102r for emission color of red are short-circuited by the conductive layer 110r, and all the anodes 102 of the organic EL region 109g in which emission color is green, and the emission color of green. Anode terminal 102g
Are short-circuited by the conductive layer 110g, and all the anodes 102 in the organic EL region 109b emitting blue light are emitted.
And the anode terminal 102b for emitting blue light are short-circuited by the conductive layer 110b. The conductive layers 110r, 110g, 110b are arranged substantially in parallel so as not to contact each other. Therefore, since the drive control can be performed for each of the anode terminals 102r, 102g, and 102b, the organic EL regions (10
9r, 109g, and 109b), and the organic EL regions (109r, 109g, and 109r) of each emission color.
The brightness can be changed for each b).

The partition resist 108 is formed on the transparent substrate 101 on which the anode 102 and the cathode terminal 111 made of ITO are formed, and all the organic EL layers (103r, 103g,
3b) is formed over a wider range than the portion where 3b) is arranged. Each of the organic ELs is provided on the partition resist 108.
A plurality of openings 108a are formed in stripes at portions where the layers (103r, 103g, 103b) are formed, and openings 112a are formed at positions corresponding to one end of each anode 102. The partition resist 108 is made of, for example, a known photosensitive resin, and is patterned by photolithography. The partition resist 108 shown in FIG. 1 has a thickness L1 of, for example, 0.015 mm (preferably 0.05 mm).
05 mm or more).

The cathode 104 is formed of a partition resist 108 and each organic E formed in the opening 108a.
Each of the organic EL layers (103r, 103g, 103g, 103r, 103g, 103b) is formed in a planar shape on the L layer (103r, 103g, 103b).
Since the sum of the thickness 103b) and the thickness of the cathode 104 is smaller than the thickness of the partition resist 108, the openings 108a of the partition resist 108 are separated from each other by the steps 108a and are insulated from each other. It has become. However, in the first example, since the anode 102 is an independent electrode for each organic EL region 109 and the cathode 104 is a common electrode over the entire organic EL region 109, the anode 102 is thicker than the step of the opening 108a of the partition resist 108. The cathodes 104 in the respective openings 108a are connected to each other by the conductive layer 110, and have substantially the same potential. Then, the organic EL layer (103) on the transparent substrate 101
r, 103g, 103b) and a cathode terminal 111 formed at a position separated from the organic EL layers (103r, 103g, 103b) and the anode 102 and connected to the conductive layer 110. ing. The cathode terminal 111 is connected to an external circuit, and is supplied with a predetermined voltage. The conductive layer 110 is formed by coating a known conductive paste such as silver.

In the first example, the organic EL layer (1
The anode 102 is not formed under the other end overlapping the conductive layer 110 of the layers 03r, 103g, and 103b). This is because when the conductive layer 110 is coated, the pressure of the organic EL layer (103
r, 103g, and 103b) in consideration of the possibility that the anode 102 and the cathode 104, which are disposed to face each other with the interposition therebetween, are short-circuited, and the conductive layer 110 is formed in order to improve the yield. The anode 102 is not provided in the portion to be formed.

The backlight 10 of the LCD of the first example is
0, the organic EL layers (103r, 103g,
In forming 3b), the organic EL layers (103r, 103g, 103
Instead of forming b), the organic EL layers (103r, 103g, 103b) are formed by wet coating. Then, the organic EL layers (103r, 103g, 1
Light-emitting materials used for the light-emitting layer in 03b) include a low-molecular material and a high-molecular material. In forming the organic EL layers (103r, 103g, and 103b) by wet coating,
For example, a polymer material is used as the material of the light emitting layer.

In the first example, the organic EL layer (10
3r, 103g, and 103b) have a hole transport layer made of a polymer conductive material and an electron transport layer. The hole transport layer, which is a hole transport region that transports holes according to the application of a voltage, is, for example, poly (3,4) etylene
dioxythiophene (hereinafter, PEDT) and polystyrenesul
It consists of phonate (PSS). The electron transporting layer is a region that emits light upon recombination and has polyfluorene or a derivative of polyfluorene having different substituents depending on the emission color.

In addition to the liquid crystal materials described above, for example, the above-mentioned polymer materials include polyvinyl carbazole, polyparaphenylene, polyarylene vinylene, polythiophene, polyfluorene, polysilane, polyacetylene, polyaniline, polypyridine, polypyridine vinylene, And polypyrrole. Examples of the polymer material include polymers and copolymers of monomers or oligomers forming the above-mentioned polymer materials (polymers), polymers and copolymers of derivatives of monomers or oligomers, and oxazole (ox Examples thereof include polymers and copolymers obtained by polymerizing a monomer having a triphenylamine skeleton (sanddiazole, triazole, diazole). In addition, as monomers of these polymers,
It includes a monomer and a precursor polymer which can form the above-mentioned compound by giving heat, pressure, UV, electron beam and the like. Further, a non-conjugated unit that bonds between these monomers may be introduced.

Specific products of polymer materials include polyvinyl carbazole: Tokyo Kasei, polytodecylthiophene: Rieke, polyethylene dioxythiophene, PS
Modified S (polystyrene sulfonic acid) dispersion cpp1
05: Nagase Sangyo, poly 9,9-dialkylfluorene,
Poly (thienylene-9,9-dialkylfluorene),
Poly (2,5-dialkylparaphenylene-thienylene), (dialkyl: R = C1 to C20): DOW Chemical Co., PPV; polyparaphenylenevinylene, MEH-P
PV; poly (2-methoxy-5- (2′-ethyl-hexyloxy) -paraphenylene vinylene), MMP-PP
V; poly (2-methoxy-5- (2′-ethyl-pentyloxy) -paraphenylenevinylene), PDMPV poly (2,5-dimethyl-paraphenylenevinylene), P
TV; poly (2,5-thienylenevinylene), PDMO
PV; poly (2,5-dimethoxyparaphenylenevinylene), CN-PPV; poly (1,4-paraphenylenecyanovinylene): CDT, and the like.

The material of the light-emitting layer that can be wet-coated is not limited to a polymer material, but may be a material in which a low molecular material is dispersed in a polymer. Further, depending on the properties of the low molecular weight material, the low molecular weight material may be used by being wet-coated while dissolved in a solvent. Various polymers including known general-purpose polymers can be used as the polymer for dispersing the low-molecular material according to the situation. As low-molecular light-emitting materials (light-emitting substances or dopants), anthracene, naphthalene, phenanthrene, pyrene, tetracene, coronene, chrysene, fluorescein, perylene, phthaloperylene, naphthaloperylene, perinone, phthaloperinone,
Naphthaloperinone, diphenylbutadiene, tetraphenylbutadiene, coumarin, oxadiazole, aldazine, bisbenzoxioline, bisstyryl, pyrazine,
Oxine, aminoquinoline, imine, diphenylethylene, vinylanthracene, diaminocarbazole, pyran, thiopyran, polymethine, merocyanine, imidazole chelated oxinoid compounds, 4-dicyanomethylene-4H-pyran and 4-dicyanomethylene-4H
-Thiopyran, diketone, chlorin compounds and derivatives thereof.

Specific products that can be used as low molecular light emitting materials include Alq3, quinacridone: Dojindo Laboratories, Almq3 (derivative of Al quinolinol complex): Chemipro Kasei Coumarin 6, DCM: ACROS, Lumogen F: Yamamoto Commerce and the like. Note that the light emitting material is not limited to the above, and the organic E
Any material can be used as long as it can form the L layer (103r, 103g, 103b).

Then, the organic EL layers (103r, 103r)
g, 103b), the partition resist 10 having the opening 108a on the transparent substrate 101 as described above.
By forming 8, the opening 108 a becomes a groove having the bottom of the upper surface of the transparent substrate 101 (actually, the upper surface of the anode 102). For example, a liquid organic EL layer (103r, 103r,
103g, 103b). That is, the tip of the needle (needle) of the dispenser is arranged at the position of each opening 108a, and a liquid material is injected into the opening 108a. Organic EL layer (103
The state of the material (r, 103g, 103b) may be a state in which the material itself is melted, a state in which the material is dissolved in a solvent, or a state in which the material is uniformly dispersed in the solvent. At this time, polymerization may have already been started, polymerization may have started, or polymerization may not have started yet. The material of the injected organic EL layer (103r, 103g, 103b)
After curing, the organic EL layer (103r, 103g, 103
b), but the thickness tends to be thinner than before curing. Partition resist 108 is sufficiently organic EL
A liquid organic EL is formed in the opening 108a so that the layers (103r, 103g, 103b) can emit light.
The layer (103r, 103g, 103b) is formed to have a thickness that does not spill over the opening 108a even when the material of the layer (103r, 103g, 103b) is injected. In addition, each organic EL layer (103
In the case where r, 103g, and 103b) are composed of a plurality of charge transport layers, for example, the same polymer-based material as the hole transport layer is first injected into all the openings 108a. The polymer material injected from the needle of the dispenser advances along the opening 108a of the partition resist 108 by a capillary phenomenon and is deposited to a uniform thickness. When a plurality of light-emitting pixels are formed in a matrix by discharging an organic EL material by an ordinary inkjet method, the organic EL material does not spread so much.
When the amount of the L material is small, the length becomes shorter, and when the minimum discharge amount is large, the light emission minimum pitch becomes longer, and a light emission region with a high-definition pitch cannot be formed. When the ink is discharged into the elongated slit surrounded by the opening 108a, it extends along the opening 108a, so that the minimum emission pitch can be made shorter and uniform in thickness with respect to the discharge amount, and the pitch can be easily made constant. it can. Next, after the hole transport layer is cured, similarly, an opening 108a in which the organic EL layer 103r that emits red light is formed, an opening 108a in which the organic EL layer 103g that emits green light is formed, and a blue light is emitted. Organic EL layer 10
Each of the openings 108a, in which the light-emitting layer 3b is formed, is injected with a polymer material of a different light-emitting layer corresponding to the emission color (or a low-molecular material if wet coating is possible).
8a are deposited to a uniform thickness. Then, after the light emitting layer is cured again, a polymer material to be an electron transporting layer is injected into all the openings 108a and cured, and the organic E layer is cured.
L layers (103r, 103g, 103b) are formed. The organic EL layers (103r, 103
When g and 103b) are composed of two layers, for example, after forming a hole transport layer, an electron transport layer different for each emission color is formed without forming a light emitting layer.

As described above, the stripe-shaped organic EL layer (103r, 103r,
03g, 103b) can be more finely patterned (based on the accuracy of patterning in the photolithography of the partition resist 108) than in the case of patterning and forming each band-shaped organic EL layer (103r, 103b).
103g, 103b) can be made shorter (pitch). The organic EL layer (103r, 1
03g, 103b), a short pitch allows each organic E region that emits red light to emit only when, for example, only each organic EL region 109r of red emits light, even if the viewing distance is short.
Light from the L region 109r uniformly overlaps, and uniform red planar light emission is obtained. Therefore, the thickness of the backlight 100 can be made extremely thin. In addition,
The organic EL layer (103r, 103g, 103
When the material of b) is injected, the minimum discharge accuracy by the dispenser is on the order of several μl, and the application amount can be sufficiently controlled by a general-purpose high-precision dispenser.

In the case where the partition resist 108 is used as described above, a plate serving as a lid is placed on the partition resist 108, for example, in a state of being attached or pressed, and is also applied to the plate or the like. An inlet and an outlet may be formed. Then, the opening 1 of the partition resist 108 is formed.
08a is a state in which the upper and lower openings are closed by the transparent substrate 101 and the plate body, so that the opening 108a is formed in the inside of the tube, and the organic EL layers (103r, 103g, 103b) are formed from the injection port to the opening 108a. May be injected. By doing so, the organic EL layers (103r, 10r,
3g, 103b).

Then, the backlight 10 shown in FIG.
0, as described above, the I
After patterning the anode 102 and the cathode terminal 111 at a short pitch by photolithography using TO, and then forming a partition resist 108, the transparent substrate 1
01 on the organic EL layer (103r, 103g, 103b)
Is formed in the opening 108a of the partition resist 108, and then the cathode 104 is formed, for example, by vapor deposition. Then, the opening 108a of the partition resist 108 is formed.
Then, the material of the organic EL layer (103r, 103g, 103b) is capillary-injected (the opening 108a has a groove shape,
Capillary action acts between the left and right walls forming the groove). Further, the organic EL layers (103r, 103g, 103
The implantation of b) is performed for each layer. For example, material injection and drying (curing) are repeatedly performed in the order of the hole transport layer, the light emitting layer, and the electron transport layer. Also, the barrier rib resist 10
8, the cathode 104 is in an independent (insulated) state for each of the openings 108a as described later. And are respectively short-circuited. In addition, the above-mentioned organic EL layer (103r, 103g,
The formation method of 103b) can also be applied to a backlight in a liquid crystal display device of a second example or lower described below.

In the LCD of the first example, according to the backlight 100, high luminance can be realized with low power consumption by the organic EL element. In addition, each of the organic EL regions (109r, 109g,
b) (Organic EL layer (103r, 103g, 103b))
Are formed in a stripe shape, so that each of the organic EL regions (109r, 109g, 109b) is arranged in a mosaic shape, or each region is provided with the same emission color as compared to a case where each region is dispersed. Independently driven
It can be manufactured easily and inexpensively. The backlight 100 has an extremely thin portion of the element body except for the transparent substrate 101, the sealing portion, and the like, and can be originally thinned. In addition, as described above, the organic EL layer ( 103r, 103g, and 103b), if the pitch of the organic EL regions (109r, 109g, and 109b) arranged in stripes is narrowed, uniform R, G, and B even if the transparent substrate 101 is thinned. The backlight 100 can be made thinner because the surface light emission of the above can be obtained. Also, the backlight 100
Basically, since the electric capacity of the luminous body is extremely small and high-speed switching is possible (for example, since the organic EL element can respond at a high speed of 100 nsec or less), it is necessary to change the luminescent color at high speed. , And can be suitably used as a backlight of a liquid crystal display device driven by.

That is, in the field sequential type LCD of the first example, the backlight is RG.
The emission color of B can be switched at high speed. Therefore,
No matter how fast the liquid crystal display panel 200 can be driven, the backlight can sufficiently follow the liquid crystal display panel 200 to switch the emission color at high speed. In addition, since the backlight can be extremely thin with low power consumption, the field-sequential LCD can be reduced in size and weight and can be driven for a long time by a battery.

As described above, each organic EL region (10
9r, 109g, 109b) (organic EL layer (103r,
103g, 103b)) are in the form of stripes. Therefore, by forming the anode 102 and the cathode 104 in the form of stripes, the organic EL regions (109r, 109g,
109b) are arranged in a mosaic form, and the anodes 102 and the cathodes 104 are easily arranged in the organic EL regions (109r, 109g, 109r) as compared with the case where the organic EL regions (109r, 109g, 109b) are finely dispersed. 10
9b) can be independent.

In addition, organic E of the same luminescent color is formed on a glass substrate.
Anode 1 of L region (109r, 109g, 109b)
02 are connected to each other and connected to the anode terminals 102r, 102g, 102b for the same emission color. Therefore, the configuration of the backlight 100 can be simplified without the need for wiring.

In the first example, the organic EL regions (109r, 109g, 109b) of each emission color (organic EL
The widths of the layers (103r, 103g, 103b) are almost the same, and the organic EL regions (109
r, 109g, and 109b) are almost the same, but the organic EL regions (109r, 109g,
g, 109b) have different luminances even when driven by the same power depending on the light emitting material used. Depending on the luminance, the width may be changed for each organic EL region (109r, 109g, 109b) and the area may be different.

As for the shape of the partition wall resist 108, in the first example, the openings 108a are also formed in a stripe shape, but each of the openings 108a has a widened portion at a portion where a liquid crystal material is injected. It may be formed. Here, the widened portion is a portion whose width in the horizontal direction is wider than other portions of the opening 108a. When the widened portion is formed, the organic EL is dispensed with a dispenser.
When injecting the material of the layers (103r, 103g, 103b), the position of the needle of the dispenser can be set. By providing the widened portion, it is possible to compensate for the positional accuracy of the needle tip of the dispenser. That is, since the width of the position of the opening 108a of the partition wall resist 108 where the needle tip is disposed is widened, the needle tip can be more easily and reliably aligned with the opening 108a.

Further, by increasing the width of the position of the opening 108a where the needle is disposed, it is possible to prevent the material from spilling out of the opening 108a when discharging the material from the needle. Therefore, when the widened portion is provided in the opening 108a, the same operation and effect as when the widened portion is not provided can be obtained, and the backlight 10
0 can improve the yield.

Further, a diffusion plate may be arranged on the surface of the transparent substrate 101 of the backlight 100 of the above example. The diffusion plate is a well-known diffusion plate which is basically transparent and has many fine irregularities on its surface. Further, the diffusion plate has a state in which, for example, a large number of peaks and valleys having a triangular cross section are continuously arranged, and a large number of prisms are formed. It is known that such a diffuser refracts light transmitted at various angles to increase the forward light component. Then, for example, a diffusion plate is attached to the surface of the transparent substrate 101, and the diffusion plate and the transparent substrate 101
In this case, a known optical oil may be filled. The refractive index of the optical oil is preferably substantially equal to or larger than that of the transparent substrate 101.

When a diffusion plate is arranged on the surface of the transparent substrate 101 and optical oil is filled between the transparent substrate 101 and the diffusion plate, more light can be extracted from the backlight 100. .

In addition to attaching a diffusion plate to the surface of the transparent substrate 101 and filling optical oil between the diffusion plate and the transparent substrate 101, for example, the surface of the transparent substrate 101 is processed. The surface itself of the transparent substrate 101 may be a diffusion surface. In addition to the provision of the diffusion surface on the transparent substrate 101 side, for example, the surface of the back electrode acting as a reflector may be used as the diffusion surface. Also in this case, the light extraction efficiency from the backlight 100 can be improved.

Next, a liquid crystal display device according to a second embodiment of the present invention will be described with reference to FIGS. In addition,
The liquid crystal display device of the second example includes the backlight 100 of the first example.
Of the liquid crystal display panel 2
Regarding 00, the same components as those in the first example are used, so that the description thereof will be omitted, and the backlight 100A will be described here. The same components as those of the backlight 100 of the first example are denoted by the same reference numerals, and the description thereof will be omitted. In FIG. 4, the organic EL layers (103r, 103g,
103b), conductive layers 110r, 110g, 110b
Is shown in a transparent state, for example, as an oblique lattice pattern, and the cathode 104 is made transparent, and in FIG. And a horizontal lattice pattern in a transparent state.
04 and the conductive layers 110r, 110g, 110b are omitted. 4 and 5 illustrate the same backlight 100A.

The backlight 100A of the second example shown in FIGS. 4 and 5 has an anode 113, a cathode terminal 111, a partition resist 114, an organic EL layer (103r, 103g, 103
b) By forming the cathode 104, a plurality of organic EL regions (109r, 109g,
09b) is formed. 4 and 5 schematically show the backlight of the second example. Actually, three organic EL regions (109r, 109g) whose emission colors are red, green, and blue, respectively. , 109b) are formed in a strip shape in parallel with each other, and similarly to the backlight 100 of the first example shown in FIG. 2, the organic EL regions (109r, 109g, 109
b) are arranged in parallel with each other.

The difference between the first example and the second example is that in the backlight 100 of the first example, each organic E
Cathode 1 in L region (109r, 109g, 109b)
04 together as a common electrode and the anode 1
02 is the organic EL region of each emission color (109r, 109g,
109b), the organic EL region of each of the emission colors can be driven.
In the L region, the anodes 113 are combined into a common electrode, and the cathode 104 is used as the organic E-light of each emission color.
That is, driving can be performed for each of the organic EL regions of each emission color collectively for each of the L regions (109r, 109g, 109b).

The backlight of the second example comprises the transparent substrate 101 and an anode 113 on the transparent substrate 101.
(Including anode terminal 113a), cathode wiring 115
r, 115g, 115b and cathode terminals 116r, 1
16g and 116b are each formed from ITO. The anode 113 is not formed for each organic EL region (109r, 109g, 109b) as in the first example, but one anode 113 corresponds to all organic EL regions (109r, 109g, 109b). Thus, it is formed in a wide planar shape and serves as a common electrode as it is.
Also, the cathode wirings 115r, 115g, 115b are:
Each organic E formed in a stripe shape on the anode 113
One is formed for each L layer (103r, 103g, 103b). Then, each cathode wiring 1
15r, 115g, and 115b are located at positions away from the anode 113, and correspond to the respective organic EL layers (103r,
103g, 103b).

The cathode wirings 115r, 115r
g and 115b are such that the positions of the ends on the anode 113 side (organic EL layer (103r, 103g, 103b) side) are striped organic EL layers (103r and 103r, respectively).
103g, 103b) so as to be substantially aligned on a straight line along a direction substantially orthogonal to the organic EL layers (103r, 103g, 103) of the respective colors.
It is different for each cathode corresponding to b). The same color organic EL layer (103r, 10r
3g, 103b).
15g and 115b are aligned so that the position of one end is substantially arranged on a straight line along a direction substantially orthogonal to the stripe-shaped organic EL layers (103r, 103g, 103b).

Each of the cathode terminals 116r, 116g, 11
6b denotes cathode wirings 115r and 1 on the transparent substrate 101.
The cathode terminals 116r, 116g, and 116g are formed on the sides of 15g and 115b and correspond to the respective emission colors.
b and the organic EL region of each emission color (109r, 109g, 1
09b), cathode wirings 115r, 115g,
One end of 115b is arranged in a line. That is, the cathode terminals 116r, 1
16g and 116b respectively have red, green, and blue emission colors, respectively.
16r and one end of all the cathode wires 115r for red are arranged in a line, and the cathode terminal 11 for green is arranged.
6 g and one end of all the green cathode wires 115 g are arranged in a line, and the blue cathode terminal 116
b and one end of all the blue cathode wires 115b are arranged in a line.

The anode 113 on the transparent substrate 101
And the cathode wirings 115r, 115g, and 115b are separated from each other so as to separate them from each other.
17 are formed. The wetness control layer 117 has an organic E layer formed in the opening 114a of the partition resist 114 as in the first example.
When the liquid material of the L layer (103r, 103g, 103b) is injected, the liquid material is prevented from being coated on the wet control layer 117, and functions as a kind of water repellent material.

The material of the wet control layer 117 is basically composed of a substance that lowers the surface energy. Examples of the substance that lowers the surface energy include a substance having a long-chain alkyl group, a fluorine group, and a silicon group. Specifically, the material of the wettability control layer 117 includes a copolymer obtained by copolymerizing a monomer mixture containing tetrafluoroethylene and at least one comonomer, and a fluorine-containing copolymer having a cyclic structure in the copolymer main chain. Polymer, polyethylene, polypropylene, polytetrafluoroethylene, polychlorotrifluoroethylene, polydichlorodifluoroethylene, a copolymer of chlorotrifluoroethylene and dichlorodifluoroethylene, and acrylonitrile, vinyl stearate, stearyl vinyl ether, ( (Meth) Stearyl acrylate, other comonomers containing a fluorine atom, and comonomers copolymerizable therewith, such as (meth) acrylic acid, (meth) acrylate, and a compound having a vinyl group, for example, vinyl acetate, Professional By copolymerizing Onsan vinyl include a copolymer obtained by.
In addition, specific products that can be used as the material of the wetness control layer 117 include, as fluorine, fluorate K-703: Dainippon Ink and Chemicals, Fluorinert: Sumitomo 3M, Cytop CTX-105A: Asahi Glass, Fluorobarrier:
Taisei Corporation, Teflon AF: Dupont, PTFE grease: Nichias, and the like. Alternatively, a silicone resin (SH200: Toray Silicone or the like) may be blended with a general-purpose polymer (acrylic resin, epoxy resin, urethane resin) or the like and applied. Also, the wettability control layer 117
The material is not limited to the above, and any material may be used as long as the material of the organic EL layer (103r, 103g, 103b) can be prevented from being applied by repelling.

Then, the anode 113 and the cathode wiring 1
15r, 115g, 115b, cathode terminal 116r,
A partition resist 114 is formed on the transparent substrate 101 on which 116 g and 116 b and the wetness control layer 117 are formed.
The partition resist 114 has an opening 114a and an opening 118a similarly to the partition resist 108 of the first example. Each of the openings 114 a is formed from one of the anodes 113 to a corresponding one of the cathode wires 115 r, 115 g, 11
5b is formed over the other end. That is,
The opening 114a and the cathode wires 115r, 115g, 1
15b correspond one-to-one, and one end of each opening 114a overlaps the other end of the cathode wiring 115r, 115g, 115b, and a common electrode is formed from each opening 114a. The anode 113 and the other end of one of the cathode wires 115r, 115g, and 115b are exposed.

The portion of the opening 114a where the anode 113 is exposed is connected to the cathode wirings 115r, 115g,
The wet control layer 117 is exposed between the portion where the end portion of 15b is exposed. Then, the organic EL layers (103r, 103g, 103b) are formed by injecting the above-described luminescent material into each opening 114a.
Is injected into a portion where the anode 113 is exposed. Then, the luminescent material injected into the opening 114a is
14a flows along the opening 114a to form the opening 114
a, when the cathode wiring 1 is repelled by the wettability control layer 117, the cathode wiring 1
15r, 115g, and 115b are prevented from flowing into portions where the other ends are exposed.

Accordingly, the organic EL layers (103r, 103
g, 103b) are openings 114 of the partition resist 114
a is formed between the other end where the anode 113 is exposed and the front side of the wet control layer 117, and the opening 114a
Wirings 115r, 115g, 115 exposed from
b is not formed on the other end.
On the other hand, the opening 118a of the partition resist 114 is configured such that one end of each of the cathode wirings 115r, 115g, and 115b is exposed instead of one end of the anode 102 in the first example. Then, each cathode wiring 11
The position of the opening 118a is determined according to the position of one end of each of 5r, 115g, and 115b.

The cathode 104 is made of the partition resist 11
4, the opening 114 of the partition resist 114
(The cathode 104 is not formed on the side of the partition resist 114 where the opening 118a is formed from the wet control layer 117). Then, the thickness of the cathode 104 in each opening 114a and the organic EL layer (103r, 103g,
103b) is smaller than the thickness of the barrier rib resist 114, and therefore, as described above, due to the step between each opening 114a of the barrier rib resist 114 and the other barrier rib portion, each opening 114a is formed at the opening 114a. The cathode 104 in the portion 114a is formed in an electrically disconnected state, and each opening 1
The cathode 104 in 14a is not short-circuited with the other cathode 104, and is an independent electrode for each opening 114a. In each opening 114a, the anode 1 is exposed at a portion where the anode 113 is exposed.
13 and the cathode 104 between the organic EL layer (103r,
103g, 103b) are opposed to each other with the cathode wirings 115r, 115g, and 115b exposed at the other ends of the cathode wirings 115r, 115g, and 115b.
5g, 115b and the cathode 104 are in direct contact and short-circuited. Therefore, for each opening 114a, that is, for each organic EL region (109r, 109g, 109g)
b) Independent cathodes 104 are connected to different cathode wirings 115r, 115g, and 115b, respectively.

Then, the organic EL regions (10
Cathode wiring 1 corresponding to 9r, 109g, 109b)
A plurality of openings 1 where 15r, 115g, and 115b are exposed
18a, the cathode terminals 116r, 116g, 11
The strip-shaped conductive layers 110r, 110g, and 110b, which are thicker than the partition resist 114, are respectively formed continuously on the upper portions 6b. Here, the conductive layer 1
Since 10r, 110g, and 110b are formed thicker than the partition wall resist 114, the conductive layer 110r is connected to all the cathode wirings 115r connected to the organic EL region 109r that emits red light through the opening 118a. And the conductive layer 110g
Is connected to all cathode wirings 115g connected to the organic EL region 109g emitting green light through the opening 118a and to the cathode terminal 116g, and the conductive layer 110b is connected to the organic EL region emitting blue light. All the cathode wirings 115b connected to 109b are connected to the opening 118a and connected to the cathode terminal 116b.

Therefore, each organic EL layer (103r, 103r)
g, 103b) is an anode 113 serving as a common electrode.
And the organic EL regions (109r, 109g, 109g) due to the step at the opening 114a of the partition resist 114.
b), each organic EL region (109) is sandwiched between the cathode 104 which is an independent electrode.
r, 109g, and 109b) are individually driven. Further, the independent cathode 104 is provided in each of the organic EL regions (1) within one end of the opening 114a.
09r, 109g, and 109b) are short-circuited to the cathode wires 115r, 115g, and 115b provided for each of them.

On the other hand, in the opening 114a, the cathode 104 is also formed continuously on the wetting control layer 117, so that the cathode 104 is formed in an electrically conductive state.
03r, 103g, 103b)
And a cathode wiring 115r,
115g and 115b are in a conductive state. That is, the cathode 104 in the opening 114a and the cathode wirings 115r, 115g, and 115b can be electrically connected without using a conductive paste layer.

Then, each of the cathode wires 115r, 115
g and 115b are openings 118a of the partition resist 114.
In the organic EL regions (109r, 10r,
9g, 109b) and conductive layers 110r, 110g, 11
0b, and the cathode terminals 116r, 116g, 11 formed one by one for each emission color.
6b, the conductive layers 110 corresponding to the emission colors, respectively.
r, 110g, and 110b are short-circuited one-to-one. Therefore, each cathode terminal 116r, 11
By changing the drive voltage (current) for each of 6g and 116b, the organic EL regions (109r,
09g, 109b) is turned on and off in order to sequentially
-It is possible to obtain B planar light emission.

According to the backlight 100A of the second example having the above configuration, the same operation and effect as those of the first example can be obtained. In addition, the cathode 104 does not need to be finely patterned so as to be formed independently for each organic EL region (109r, 109g, 109b).
Since the partition resist 114 having the resist 4a can be formed into a shape independent of each organic EL region (109r, 109g, 109b), the cathode 104 can be very easily formed independent of each organic EL region (109r, 109g, 109b). It can be shaped. Also, the anode 113
Also, fine patterning is not required because the common electrode is used. Therefore, it is possible to easily form the electrodes on the transparent substrate. In addition, the coating control layer 11 having a low surface energy is formed in the opening 114a of the partition resist 114.
7, the organic EL region (109r, 10r
The cathode 104 in 9g, 109b) can be easily connected to the outside. In the second example, a widened portion may be formed in the opening 114a. Also,
A cathode terminal 116 for each emission color is provided on the transparent substrate 101.
A cathode terminal may be provided for each organic EL region (109r, 109g, 109b) without providing r, 116g, and 116b. Further, in the second example, instead of providing the wet control layer 117, the partition resist 1 was used.
The opening portion 108a may be provided with a narrow portion in which the width of the opening portion 108a is narrowed in a bottle neck shape at the portion where the wet control layer 117 is disposed. If you do this,
When the material of the organic EL layer (103r, 103g, 103b) is injected into the portion of the opening 108a where the anode 113 is exposed, it becomes difficult for the material to flow in from the narrow width portion that becomes the bottleneck, and Even if the control layer 117 is not provided, the same operation and effect as provided by the wet control layer 117 can be obtained.

Next, a liquid crystal display device according to a third embodiment of the present invention will be described with reference to FIGS. In addition,
The liquid crystal display device of the third example is a modification of the liquid crystal display device of the second example, in which a part of the configuration of the backlight 100 of the first example is changed, and the liquid crystal display panel is the same as that of the first example. The description is omitted here, and only the description of the backlight 100B will be given here. Also, the same components as those of the backlight 100A of the second example are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 6, the organic EL layers (103r, 103g, 103b), the conductive layer 1
For example, 10r, 110g, and 110b are shown in a transparent state as an oblique lattice pattern, and the cathode 104 is made transparent, and in FIG. 7, the organic EL layers (103r,
03g, 103b), the partition resist 120 is, for example,
The cathode 104 and the conductive layers 110r and 1r are shown in a transparent state as an oblique or horizontal lattice pattern.
Illustration of 10g and 110b is omitted. And FIG.
7A and 7B illustrate the same backlight 100B.

The backlight 100B of the third example shown in FIGS. 6 and 7 has an anode 113 and cathode terminals 122r, 122r on a transparent substrate 101, as in the first example.
g, 122b, cathode wirings 121r, 121g, 12
1b, partition resist 120, organic EL layer (103r, 1
03g, 103b), cathode 104, wet control layer 11
7 and a low-resistance wiring 119 described later are formed, so that a plurality of organic EL regions (109r, 109r,
109g and 109b) are formed. Also,
As in the liquid crystal display device of the second example, a wet control layer 117 is formed on the transparent substrate 101. And FIG.
7A and 7B schematically show the backlight 100B of the third example, and in fact, the emission colors are red and red, respectively.
Three organic EL regions made green and blue (109r, 109
g, 109b) are formed in a band shape in parallel with each other, and similarly to the backlight 100 of the first example shown in FIG.
109g and 109b) are arranged in parallel with each other.

The backlight 10 of the LCD of the third example is
0B, like the backlight 100A of the LCD of the second example, collects the anode 113 side into one and forms a common electrode,
Further, the cathode 104 is connected to the organic EL region (10
9r, 109g, and 109b) so that they can be driven for each organic EL region of each emission color. The arrangement of the wirings on the cathode side is basically the same as that of the second example, and a detailed description of the wirings is omitted, but the cathode wirings 121r, 121g, 121b and the cathode terminal 1
Materials used for 22r, 122g, and 122b are different from those of the second example (described later). The difference between the third example and the second example is that, first, a low-resistance wiring 119 is provided with respect to the supply of power from the anode 113 side. Second, in the liquid crystal display device of the second example, Are the cathode wires 121r, 121g, 121b and the cathode terminal 122
r, 122g, and 122b are formed of a metal film made of a low-resistance conductive material, which will be described later, in the liquid crystal display device of the third example, in contrast to those formed of ITO.

As shown in FIGS. 6 and 7, in the backlight of the third example, an anode 113 made of ITO (transparent electrode) is formed on a transparent substrate 101 in a square shape. 6 and 7, the anode 113 is connected to a low-resistance wiring 119 described below, and a portion overlapping the low-resistance wiring 119 and an organic EL layer (103r, 103r, 103g and 103b) are deposited thereon. The anode 113 is
Organic EL layers (103r, 103g, 103b) described later
Is formed in a range including the entire portion where the is disposed.

Then, on the transparent substrate 101 on which the anode 113 is formed, as shown in FIG.
9 and each organic EL region (109r, 109g,
b) Three cathode terminals 122r, 122g, and 12 for connecting the cathode 104 portion to the outside for each organic EL region (109r, 109g, 109b) of each emission color.
2b and each organic EL region (109r, 109g,
b) The cathode terminals 122r, 122g, and 122b are connected to the respective cathode 104 portions and are grouped by the conductive layers 110r, 110g, and 110b for each organic EL region (109r, 109g, and 109b) of each emission color.
Cathode lines 121r, 121g, 121 connected to
b are formed. Low resistance wiring 119, cathode terminals 122r, 122g, 122b, cathode wiring 121
r, 121g, and 121b are obtained by, for example, patterning a metal film made of a low-resistance conductive material made of a single metal such as aluminum, neodymium, or chromium, or an alloy containing at least one of them, at a time. I have.

The low resistance wiring 119 is connected to the anode 113
An anode terminal 119a for connecting the external
13 and a plurality of low-resistance wiring portions 119b formed directly on the anode 113 and short-circuited. Then, the low-resistance wiring portion 119b is provided on the anode 113 with the organic EL layer (103r, 103g,
103b) and the organic EL layers (103r, 103g, 103b) are formed in a stripe shape.
A low-resistance wiring portion 119b is formed in a stripe shape between the layers (103r, 103g, 103b). Further, the low-resistance wiring portion 119b is in a state in which stripe-shaped portions are integrally formed on the anode terminal 119a side (the side opposite to the cathode wirings 121r, 121g, and 121b). Formed and organic E
L layers (103r, 103g, 103b) are formed.

At the boundary between the low-resistance wiring section 119b and the organic EL layer (103r, 103g, 103b), if the low-resistance wiring section 119b is not connected to the cathode 104, the low-resistance wiring section 119b and the organic EL layer are not connected. EL layer (10
3r, 103g, and 103b), and a low-resistance wiring portion 119b and an organic EL layer (1
03r, 103g, and 103b) may be in contact with each other, or the low-resistance wiring portion 119b and the organic EL layer (1
03r, 103g, and 103b) may slightly overlap each other. The anode terminal 119a and the low-resistance wiring portion 119b are formed as a low-resistance wiring 119 in a state where they are electrically connected to each other.

The low-resistance wiring 119 and the cathode terminal 12
2r, 122g, 122b and cathode wiring 121r,
121g and 121b are made of the same material and are formed together in the same process. Note that the low resistance wiring 11
9, the cathode terminals 122r, 122g, 122b and the cathode wires 121r, 121g, 121b are, for example,
Although it is formed by depositing a metal by vapor deposition, it may be formed by other methods as long as it is formed of a conductive material having a lower resistance than ITO and less susceptible to oxidation in the thickness direction.

On the transparent substrate 101, a wet control layer 117 is formed. Above wetness control layer 117
Are the cathode wires 121r, 121g, and 121b, the anode 113, and the low-resistance wire 11 on the anode 113.
9 and is formed in a strip shape on the transparent substrate 101 exposed between the anode 9 and the cathode wirings 121r, 121g and 121b, the anode 113 and the low resistance wiring 119. As described later, the wetness control layer 117 may be formed only at a portion exposed from the opening 120a of the partition wall resist 120 at the above-described arrangement position, and need not necessarily be formed in a continuous band shape.

Then, as described above, the anode 113,
Low resistance wiring 119, cathode terminals 122r, 122g,
122b, cathode wirings 121r, 121g, 121b
A partition resist 120 is formed on the transparent substrate 101 on which the wet control layer 117 is formed. Partition resist 1
Numeral 20 is made of, for example, a photosensitive resin and is formed by patterning by photolithography.

The partition resist 120 is formed by the above-described anode 113, the low-resistance wiring portion 119b of the low-resistance wiring 119, and the cathode wirings 121r, 121g, and 121b.
Are formed so as to cover all of them. The anode terminal 119a and the cathode terminals 122r, 122g, 122b of the low-resistance wiring 119 are exposed from the partition wall resist 120. Similarly to the second example, in the partition wall resist 120, the openings 120a are formed, and at the same time, the cathode wirings 121r, 121g,
An opening 123a is formed at the other end of 1b.

In the method of manufacturing the backlight shown in FIGS. 6 and 7, the anode 113 made of ITO is formed on the transparent substrate 101, and then the low-resistance wiring 119 made of a metal film is formed by, for example, evaporation. Cathode terminal 122
r, 122g, 122b and cathode wirings 121r,
21g and 121b are patterned. Further, a wet control layer 117 is formed on the transparent substrate 101. Next, a partition having an opening 120a for exposing the anode 113 and an opening 123a for exposing one end of the cathode wirings 121r, 121g, 121b for connection to the cathode terminals 122r, 122g, 122b. The resist 120 is patterned by photolithography. Next, in the opening 120a of the partition resist 120,
Of the organic EL layers (103r, 103g, 103b)
The material for the hole transport layer (region emitting red light), hole transport layer (region emitting green light), and hole transport layer (region emitting blue light) are injected and solidified. An electron transport layer (a region that emits red light), an electron transport layer (a region that emits green light), and an electron transport layer (a region that emits blue light) are injected and solidified similarly to form an organic EL layer (103r, 103g, 103).
b) is formed. Next, the cathode 104 is formed, for example, by vapor deposition. In the third example, the partition resist 1 was used.
20 is an organic EL layer (103r, 103r) between the anode 113 and the low resistance wiring portion 119b and the cathode 104;
g, 103b) functions as a film that insulates between the cathode 113 and the anode 113 and the low-resistance wiring portion 119b in a portion where no cathode is provided.

According to the backlight of the third example having the above configuration, the same operation and effect as those of the first and second examples can be obtained, and at the same time, the low resistance wiring 119 is provided on the anode 113 side.
Are formed, the following effects can be obtained. That is, since ITO having a high light transmittance and a high resistance value is used as the anode 113,
When the light emitting surface is wide, the longer the distance from the connection to the power source, the higher the resistance value. Therefore, the amount of current flowing through the organic EL layer between the portion near and far from the connection to the power source And the luminance may vary depending on the location. However, each organic EL layer (103r, 1
03g, 103b) and a low-resistance wiring portion 1 that is short-circuited with the anode 113 in most portions.
19b, and an anode terminal 119a connected to an external power supply is connected to the low resistance wiring portion 119b.
Each organic EL layer (103r, 103g, 103
b) In each position, the anode 1 near the position
The current flowing to the low resistance wiring 119 side up to the thirteenth portion is applied to the organic EL layers (103r, 103g,
03b), and depending on the position of the light emitting surface,
The current flowing through the organic EL layers (103r, 103g, 103b) does not greatly differ, and the luminance at each position on the light emitting surface can be homogenized. Therefore, the luminance at each position of the light emitting surface of the backlight can be made more uniform, and even if the light emitting surface of the backlight is enlarged, it is possible to prevent the luminance from being varied in the light emitting surface. In the third example, as in the case of the second example, each of the organic EL regions (109r, 109g, 109b)
According to the luminance based on the light emitting material, the width may be changed for each organic EL region (109r, 109g, 109b) so that the area thereof is different. In addition, partition resist 1
As in the case of the second example, a narrow portion in which the width of the opening is reduced may be formed in the 20 opening 120a. Also,
Cathode terminals 122r, 122 constituting the multilayer wiring
g, 122b and cathode wirings 121r, 121g, 1
21b can be formed simultaneously with the formation of the low-resistance wiring 119.

Next, referring to FIGS. 8, 9 and 10,
A liquid crystal display device according to a fourth embodiment of the present invention will be described. Incidentally, the liquid crystal display device of the fourth example is a modification of the configuration of a part of the backlight 100 of the first example, similarly to the liquid crystal display device of the second example.
Since the same components as those in the first example are used, the description will be omitted, and only the description of the backlight 100C will be given here. Further, the same components as those of the backlights 100A and 100B of the second or third example are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 8, the organic EL layer (103r,
103g, 103b), conductive layers 110r, 110g,
110b is shown in a transparent state, for example, as an oblique lattice pattern, and is shown in a transparent state through the cathode 104. In FIG. 9, the organic EL layers (103r, 103g, 103) are shown.
b), the partition resist 125 is shown as a pattern in a diagonal lattice or horizontal lattice, for example, and the cathode 104 and the conductive layers 110r, 110g, 110
Illustration of b is omitted. 8 and 9 and FIG.
Reference numeral 0 indicates the same backlight 100C of the fourth example.

The backlight 100C of the fourth example shown in FIGS. 8, 9 and 10 has a transparent substrate 1 like the first example.
01, an anode 124, a cathode terminal 129r,
29g, 129b, cathode wires 128r, 128g,
128b, partition resist 125, organic EL layer (103
r, 103g, 103b), the cathode 104, and the wetness control layer 117, whereby a plurality of organic EL regions (109r, 109g, 109b) are formed on the stripe. 8 and 9 schematically show a fourth example of a backlight 100C.
Actually, three organic EL regions (109r, 109g, 109b) whose emission colors are respectively red, green, and blue are formed in a belt shape in parallel with each other, and the back of the first example shown in FIG. As in the case of the light 100, the organic EL regions (109r, 109g, and 109b) in which these three are set as one set
Are arranged in parallel with each other.

Further, in the liquid crystal display device of the fourth example, similarly to the liquid crystal display device of the third example, a cathode 104 formed of a metal film made of a low-resistance conductive material, which will be described later, is used for the organic EL of each emission color. The driving is performed for each of the organic EL regions of each emission color by collecting the regions (109r, 109g, 109b). The configuration on the cathode side is the same as that of the third example, and the description is omitted. The metal film made of a low-resistance conductive material used for the cathode is used in the low-resistance wiring of the third example. The difference between the fourth example and the third example is that in the third example, the organic EL layer (103
r, 103g, and 103b) using ITO as an anode electrode connected to the organic EL layer (103r, 103g, 103b).
03g, 103b) In order to uniformly supply power to the entirety, the low-resistance wiring 119 (metal film made of a low-resistance conductive material) was used as an auxiliary. The electrode is formed only from the metal film made of the low-resistance conductive material. The organic EL layer (10
3r, 103g, 103b), as shown in FIG.
The organic EL layer 103r includes a hole transport layer 103rh made of a polymer conductive material and an electron transport layer 103re.
The L layer 103g is a hole transport layer 103 made of a polymer conductive material.
gh and the electron transport layer 103ge, and the organic EL layer 1
03b is composed of a hole transport layer 103bh made of a polymer conductive material and an electron transport layer 8be. The hole transport layer 103rh, which is a hole transport region that transports holes in response to the application of a voltage.
Each of 03gh and 103bh is made of the above-mentioned PEDT and PSS, has a sheet resistance of 10 ⁸ Ω / □ or less, preferably 10 ⁷ Ω / □ or less, and also serves as a hole injection region. Electron transport layers 103re, 103ge, 103be
Is a region that emits light upon recombination, and has polyfluorene or a derivative of polyfluorene having different substituents depending on the emission color. Note that another material may be used as the liquid crystal material as in the first example.

As shown in FIGS. 8, 9 and 10, the backlight 100C of the fourth example is such that a low-resistance conductive material such as a metal film is formed on a transparent substrate 101 (for example, a glass substrate or a transparent film substrate). , And the cathode 104 for each organic EL region (109r, 109g, 109b) are connected to the organic EL region (109r,
109g, 109b), three cathode terminals 129r, 129g, 129b for connection to the outside, and a cathode 104 for each organic EL region (109r, 109g, 109b). , 110g, and 110b form cathode wirings 128r, 128g, and 128b that are collectively arranged for the respective organic EL regions (109r, 109g, and 109b) of the respective emission colors and that are connected to the cathode terminals 129r, 129g, and 129b.

The anode 124 is connected to the anode terminal 12
4a, and a comb-shaped hole injection wiring portion 124b integrally formed from the same metal film in this example. Further, the cathode terminals 129r, 129g, 129b and the cathode wires 128r, 128g, 128b are also formed of the same metal film as the anode 124. Then, the anode 124, the cathode terminals 129r, 129g, 129
b and the cathode wires 128r, 128g, 128b
It is obtained by patterning the above metal film all together.

The hole injection wiring portion 124b of the anode 124 is formed by the organic EL layers (103r, 103g, 103g).
b) and almost exclusively, and since the organic EL layers (103r, 103g, 103b) are formed in stripes, the organic EL layers (1
03r, 103g, 103b). The anode 124 is connected to the anode terminal 124a side (cathode wires 128r, 128g, 128g).
(opposite side b), the stripe-shaped portions are integrated.

Then, the anode 124 and the organic EL layer (1
03r, 103g, and 103b), the anode 124 and the organic EL layer (103r, 103b)
g, 103b) slightly overlap with each other. That is, the side edges along the length direction of the left and right organic EL layers (103r, 103g, 103b) of the striped, that is, the strip-like organic EL layers (103r, 103g, 103b) close to the linear shape are positive. It is in a state of overlapping with the hole injection wiring part 124b. Then, the organic EL layers (103r, 103g,
The central portion of 103b) excluding the left and right side edges is directly formed on the transparent substrate 101 without overlapping with the anode 124.

The above-mentioned anode 124 and cathode terminal 129
r, 129g, 129b and cathode wiring 128r,
28g and 128b are formed from the same material as described above, and are formed almost simultaneously by patterning one metal film.
4, anode terminal 124a, cathode terminal 129r, 1
29g, 129b and cathode wires 128r, 128
g, 128b will be formed together in the same process. In addition, the anode 124, the cathode terminal 129r,
29g, 129b and cathode wires 128r, 128
g and 128b are formed, for example, by depositing a metal by vapor deposition, but may be formed by another method.

The partition resist 125 is formed by the above-described anode 124 and cathode wirings 128r, 128g, and 1g.
It is formed in a planar shape so as to cover 28b. The anode terminal 124a and the cathode terminals 129r, 129r
g and 129b are not covered with the partition resist 125 (a part of them is required to be exposed in order to connect to the outside). The partition resist 125 has a thickness L1.
Is, for example, 0.015 mm (preferably 0.005 m
m or more), and each organic EL layer (103r, 103g,
The pitch L2 of the organic EL layers (103r, 103g, 103b) is about 0.06 mm, and the pitch L2 of the organic EL layers (103r, 103g, 103b) is about 0.06 mm.
3g, 103b) (the width of the partition wall of the partition wall resist) is about 0.04 mm. The pitch of the openings 125a of the partition resist 125 is also about 0.1 mm, and the pitch of the anodes 124 is also set at about 0.1 mm.

Since the hole injecting wiring portion 124b has a low sheet resistance of 10 ⁸ Ω / □ or less and excellent hole transporting property, the hole transporting layer portion 124b has an electron transporting layer embedded in the opening 125a. It is not necessary that the cathode 104 is configured to completely overlap with the cathode 104 for injecting electrons through the hole transport layer. That is, since the hole injection wiring portion 124b does not overlap with the light emitting surface as long as it is partially connected to the hole transport layer, light emitted from the organic EL layers (103r, 103g, 103b) Most of the light can be directly emitted to the transparent substrate 101 without passing through the hole injection wiring portion 124b, so that the attenuation of light due to light absorption at the anode electrode can be suppressed as in the related art, and the anode 1
24 is an organic EL layer (103).
r, 103g, and 103b) do not need to have a high transmittance for light emitted from them. Further, the low sheet resistance of the hole transport layer means that the hole transport layer itself functions as an anode electrode, and the metal film applied to the anode 124 must have a high work function from the viewpoint of hole injection properties. In order to solve such a problem, the metal film has a material resistivity of 2.0 × 10 ⁻⁴ Ωcm or less and a sheet resistance of 10 × 10 ⁻⁴ Ωcm or less.
Ω / □ or less is sufficient, and the selectivity of the material of the metal film is excellent. As the metal film applied to the anode 124, for example, a metal simple substance such as aluminum, titanium, tungsten, neodymium, or chromium, or an alloy containing at least one of these, or a transparent metal such as ITO is used. . However, since ITO has a relatively high resistivity of about 1.6 × 10 ⁻⁴ Ωcm, it is necessary to form a thick film in order to lower the sheet resistance, and the throughput is reduced. Further, when an attempt is made to form a wide planar light-emitting element for the organic EL element, when the area of ITO, which is a transparent electrode, increases, the distance between the connection portion of the ITO to the power source and the portion farthest from the connection portion increases. In these portions, a difference occurs in the amount of current flowing through the organic EL layer. Therefore, if the planar light-emitting body made of the organic EL element is made too large, there is a possibility that a clear difference in luminance occurs depending on the position of the planar light-emitting body. Further, a transparent film substrate having flexibility and flexibility may be used as the transparent substrate.
If an L element is formed, there is a possibility that the application range of the organic EL element can be expanded based on its flexibility and flexibility. However, ITO is highly brittle, and if the transparent film substrate is bent at a sharp angle or bent many times, the ITO may be damaged, and even if the transparent substrate is used as a transparent film substrate, its characteristics can be fully utilized. I couldn't do that. Further, at the time of manufacturing, it is difficult to form hard and brittle ITO on a soft transparent film substrate, and there is a possibility that the yield may be reduced. Further, when a transparent film substrate having ITO formed on its surface is rolled into a roll at the time of manufacturing a backlight, the yield may be reduced.

For this reason, the metal film applied to the anode 124 is more preferably a simple metal or alloy having a density of 1.0 × 10 ⁻⁵ Ωcm or less, and more desirably excellent in ductility and malleability. Then, from the viewpoint of light use efficiency, the organic E
It is preferable that the light having a high reflectance with respect to the light emitted from the L layers (103r, 103g, 103b). In the backlight having such a structure, the width L3 is as short as about 0.06 mm, and the sheet resistance of the hole transport layer which is the hole injection region is 1 mm.
0 ⁸ Ω / □ or less, holes can be transported from almost the entire surface of the hole transport layer to the electron transport layer even if they only partially overlap with the hole injection wiring portion 124b.
Light can be emitted on almost the entire surface of the L layer (103r, 103g, 103b). Therefore, the hole injection wiring section 12
4b emits light sufficiently without contacting the entire surface of the hole transport layer, which is a charge transport region for transporting charge in response to the application of a voltage, so that the conventional light absorption loss by the anode can be suppressed.

The manufacturing method of the backlight 100C shown in FIGS. 8, 9 and 10 is such that a single metal such as aluminum, titanium, tungsten, neodymium or chromium is deposited on the transparent substrate 101 by vapor deposition or the like. Made of a low-resistance metal film such as an alloy containing at least one of the following or a transparent metal such as ITO.
4, anode terminal 124a, cathode terminal 129r, 1
29g, 129b and cathode wires 128r, 128
g and 128b are patterned by photolithography. Thereafter, 0.6-0.8 Torr, 250 W, 1
Perform oxygen plasma cleaning at 3.56 MHz. Aluminum etc. may have an extremely thin oxide film formed on the surface,
When an initial voltage is applied, the oxide film is broken down and a current can flow, so that sufficient driving can be performed. Further, a wet control layer 117 is formed on the transparent substrate 101. next,
The partition resist 125 is patterned by photolithography. Next, the opening 1 of the partition resist 125 is formed.
An organic EL layer (103r, 103g, 103
In b), a mixture solution of PEDT and PSS to be a hole transport layer is injected by an inkjet or a needle to obtain 1
After heating at 10 ° C. for about 10 minutes to solidify, an electron transporting layer having a polyfluorene derivative having a different substituent depending on the emission color is injected on each of them, and the mixture is heated at 40 to 60 ° C. for 1.0 to 1.0.
The organic EL layer (103r,
103g, 103b) are formed. Each of the formed hole transport layers has a sheet resistance of 10 ⁸ Ω / □ or less, preferably 10 ⁷ Ω / □ or less. Next, a cathode 104 is formed by sequentially vacuum-depositing a calcium layer of about 300 ° and an aluminum layer of about 6000 to 10000 °. In the first example, the barrier rib resist 125
Is the organic EL between the anode 124 and the cathode 104
In portions where the layers (103r, 103g, 103b) are not interposed, they function as an insulating film between the anode 124 and the cathode 104. When the partition resist 125 is used, the injected organic EL layer (103r,
03g, 103b) has an opening 1 due to capillary action.
The opening portion 125a has a groove shape, but a capillary phenomenon acts between the left and right walls forming the groove. Therefore, the organic EL layers (103r, 103g,
103b) can be made extremely thin.

In the backlight 100C of the fourth example, it is desirable to use a metal film having a lower resistivity than ITO as the anode 124. And the anode 12
Numeral 4 substantially linearly overlaps on both side edges of the organic EL layers (103r, 103g, 103b).
And an organic EL layer (103r, 103g, 103b)
The central portion excluding both side edges of the transparent substrate 101 is in direct contact with the transparent substrate 101. That is, when viewed from the transparent substrate 101 side, the organic EL layers (103r, 103g,
The left and right side edges of the light emitting surface of b)
4, but the organic EL layer (103
Most parts except for the right and left side edges of (r, 103g, 103b) are exposed from the anode 124.

According to the backlight 100C of the fourth example having the above configuration, the same operation and effect as those of the first to third examples can be obtained, and the following operation and effect can be obtained. When a voltage is applied between the anode 124 and the cathode 104, the organic EL layers (103r, 103g,
A current will flow through 103b). At this time, the organic EL layers (103r, 103g, 103b) are originally thin strips, and the sheet resistance of the hole transport layer is 10 ⁸ Ω / □ or less. Therefore, when a voltage is applied between the anode 124 and the cathode 104 in a state where both side edges are in contact with the anode 124, the organic EL layers (103r, 10r
3g, 103b), a current flows in almost the entirety, and almost the entire organic EL layer (103r, 103g, 103b) emits light. Another object of the present invention is to obtain a high-luminance R, G, B planar light emission by mixing light from a large number of linear (band) light sources. In the direction perpendicular to the length direction of (103r, 103g, 103b), light and dark are repeated, and the organic EL layer (103r,
The widths of 103g and 103b) are originally extremely narrow. Therefore, the organic EL layers (103r, 103
g, 103b) anode 124 having left and right opaque edges
There is no particular problem even if they overlap.

Light emitted from most of the organic EL layers (103r, 103g, 103b) exposed from the anode 124 is radiated to the transparent substrate 101 as it is. At this time, the organic EL layers (103r, 103g,
103b) emits light from the transparent substrate 101 as in the prior art.
As compared with the case of (1), since the light having no light transmittance is not transmitted through the ITO, the emitted light has an increased luminous flux by the amount of attenuation by the ITO.

The organic EL layers (103r, 103g, 103
b) The variation in the luminance in the length direction can be reduced by using a metal film having a lower resistivity as the anode 124 than by using ITO having a high resistivity. In other words, when ITO having a high resistivity is used as a wide planar or long strip-shaped electrode, the value of the current flowing depending on the position may vary greatly and the luminance may vary, but the resistivity is 1 × 10 ^−. If the metal film has a thickness of ⁵ Ωcm or less, the amount of current flowing therethrough does not greatly differ depending on the position even with the same film thickness, and the luminance can be made more uniform.

Further, if a metal film can be used as the anode 124 without using ITO, the metal film generally has higher strength and flexibility as compared with ITO, so that ITO having high brittleness is used. The yield can be improved as compared with the case of using. In addition, when the transparent substrate 101 is a transparent film substrate having high flexibility, a hard and brittle incompatible with ITO is used, and a manufacturing method and a usage method utilizing characteristics of the transparent film substrate having high flexibility are used. However, it is difficult to use the
If a metal film is used without using O, the metal film has a certain degree of flexibility and high strength, so that a manufacturing method and a usage method utilizing characteristics of the transparent film substrate can be used. Further, the yield can be improved when the transparent substrate 101 is a transparent film substrate.

As in the second example, a diffusion plate may be arranged on the surface of the transparent substrate 101 of the backlight of the above example. In this case, the same operation and effect as those of the second example can be obtained, and at the same time, in the fourth example,
If 4b is formed of a light-reflective metal film other than ITO, ITO is not formed over the entire surface of the hole transport layer.
Light emitted from the organic EL layers (103r, 103g, 103b) is not absorbed by ITO during repeated reflection, and when a diffusion plate is used as in this modification, a conventional back light is used. Luminance can be further increased as compared with the case where a diffusion plate is provided in the light. In addition, for example, the surface of the transparent substrate 101 may be processed and the surface itself of the transparent substrate 101 may be used as the diffusion surface. Further, the surface of the back electrode that functions as a reflector may be a diffusion surface. In this case, if the anode 124 made of a metal film functions as a reflector, the surface of the anode 124 may be used as a diffusion surface. That is, in the backlight of the present invention, a portion functioning as a reflector may be a diffusion surface. In this case, as described above, the anode 124
The absence of ITO with low transmittance as
Since the attenuation factor of light when repeatedly reflected can be reduced, the light attenuation when light is repeatedly reflected and extracted is reduced, and more light can be extracted.

Next, an LCD according to a fifth embodiment of the present invention will be described with reference to FIGS. The LCD of the fifth example is a backlight 100 of the fourth example.
C, the anode 124 and the cathode 104 buried in the openings 130a of the partition wall resist 125 are formed so as to partially overlap with each other, as shown in FIGS. Are formed so as not to overlap. Also in the fifth example, the same liquid crystal display panel 200 as the first example is used, and the description of the liquid crystal display panel 200 will be omitted.
FIG. 11 shows an LCD backlight 10 of the fifth example.
FIG. 12 is a plan view looking down on 0D from above, and FIG.
FIG. 4 is a cross-sectional view taken along line AA ′ of FIG. 11 and 12, members having the same function and the same material as those of the fourth example are denoted by the same reference numerals.

In the figure, the transparent substrate 1 of the backlight 100D is shown.
On the lower half of 01, a hole transport layer 103h made of PEDT and PSS and having a sheet resistance of 10 ⁸ Ω / □ or less, preferably 10 ⁷ Ω / □ or less is formed. From the hole transport layer 103h to a part of the upper half side of the transparent substrate 101, polyfluorene or a substituent having a different substituent depending on the emission color is used.
A plurality of stripe-shaped electron transport layers 103re, 103ge, and 103be each having a polyfluorene derivative are arranged in parallel in this order. Then, an anode 124 is formed over the transparent substrate 101 and over the hole transport layer 103h. The hole injection wiring portion 124b of the anode 124 is connected to the electron transport layer 1 on the hole transport layer 103h.
Between 03re, 103ge and 103be, the electron transport layer 1
The anode terminals 124a are arranged on the transparent substrate 101 so as to be separated from the elements 03re, 103ge, and 103be. Electron transport layers 103re, 103ge, 103
A stripe-shaped cathode 104 having the same width as or narrower than the electron transport layers 103re, 103ge, and 103be is formed from above the be to the upper half side of the transparent substrate 101. In the figure, three cathode terminals 12
9r, 129g, and 129b are arranged. Anode 124, cathode terminals 129r, 129g, 129b,
In addition, the cathode 104 is formed by collectively patterning the same metal film. The anode 124 has a low sheet resistance of the hole transport layer 103h having a good hole injecting property.
Although the work function does not need to be high, the cathode 104 preferably has a low work function. Therefore, it is preferable that the metal film to be the cathode 104 and the anode 124 has a material having a low work function in at least a part thereof. Also, from the viewpoint of adhesion (contact resistance) with the electron transport layers 103re, 103ge, and 103be, a calcium layer of about 300 ° and a 6000 ° layer provided thereon to reduce the sheet resistance
A two-layer structure of an aluminum layer having a thickness of about Å10000 ° is desirable, but the material is not limited to this, and another material having a low work function may be used.
The upper half side of the transparent substrate 101 of the cathode 104 is covered with a partition resist 125 made of an insulating material, and its end is exposed from an opening 130b of the partition resist 125, and a cathode terminal 129r is formed on the partition resist 125 from above.
The conductive layer 110 formed over 129g and 129b
r, 110g, and 110b. In addition, since the hole transport layer 103h has a low sheet resistance, it is preferable not to form the cathode 104 on the hole transport layer 103h to prevent a short circuit.

In the LCD backlight 100D of the fifth example, the hole transport layer 103h having a low sheet resistance even if not thick.
Since the anode and the cathode do not need to be formed overlapping each other, the anode 124 and the cathode terminal 129 are used.
Since r, 129g, 129b, and the cathode 104 can be formed by patterning the same metal film, the productivity of the backlight 100D is high. In the backlight 100D, the hole transport layers 103rh, 103gh,
The anode 124 and the cathode 104 are located above 103 bh.
Are formed on the transparent substrate 101 by forming a comb-shaped patterned anode 124 and a striped cathode 104 between the combs of the anode 124 so as to be separated from each other, and excluding the terminal portion only on the cathode 104 except for the terminal portion. 10
4 is wider than the cathode 104 so as to cover the electron transport layer 1.
03re, 103ge, 103be are formed, and the electron transport layers 103re, 103ge,
A continuous hole transport layer 103h may be formed over 3be.

As shown in FIG. 13, in a backlight 100E as a modified example of the backlight 100D, a comb-shaped anode 124 is formed on the transparent substrate 101, and a sheet is formed on the hole injection wiring portion 2b. Resistance is 10 ⁸ Ω
/ □ or less, preferably 10 ⁷ Ω / □ or less.
03h, on the hole transport layer 103h between the hole injection wiring portions 124b, a stripe-shaped electron transport layer 103re having polyfluorene or a derivative of polyfluorene,
A plurality of pairs of 103ge and 103be are formed in this order in parallel, and the electron transport layers 103re and 103g are formed thereon.
A structure in which the stripe-shaped cathode 104 having the same width as or narrower than e and 103be may be formed. Note that the anode 124 and the cathode 104 can be formed of different materials. In each of the above embodiments, as shown in FIG.
Each pixel electrode 204 of the liquid crystal display panel 200 corresponds to one of the organic EL layers (103r, 103g, 103b).
03b), each organic EL layer (10
3r, 103g, and 103b) each of which has at least two pixel electrodes 204 adjacent to each other in a direction perpendicular to the direction in which the stripes extend in the organic EL layer (103r, 103g, and 103b).
May be formed so as to correspond to any one of the above.

[0125]

According to the liquid crystal display device of the present invention, in the backlight, two or more types of organic EL regions emitting lights of different colors are arranged on a transparent substrate so as to be dispersed for each type. In addition, light can be sequentially emitted in different colors. For example, if there are three types of organic EL regions and their emission colors are red, green, and blue, which are the three primary colors of light, the organic EL element can respond at high speed. The organic EL region can be switched on and off at high speed. Therefore, this backlight can be suitably used as a backlight of a field sequential full-color LCD capable of full-color display without a color filter by switching red, green, and blue displays at high speed.

The backlight of the liquid crystal display device is composed of organic EL elements. In the operation of the liquid crystal display device of the present invention, the organic EL elements emitting R, G, B light are arranged so as to be dispersed. That is enough. Therefore, R • G •
B It is sufficient to use an organic EL that emits planar light in a single color. Light emission of each of RGB from the stripe-shaped organic EL region can be performed with high luminance.
Therefore, when this backlight is used, for example,
Extremely thinner and more efficient than conventional backlights combining fluorescent tubes and light guide plates,
The LCD can be made even thinner.

By arranging the organic EL regions in stripes, the organic EL regions can be arranged in a mosaic or other state.
Compared to the case where the regions are dispersed, the cathode, the anode, and the organic EL layer can be formed extremely easily, and the manufacture of the backlight can be facilitated.

[Brief description of the drawings]

FIG. 1 is a drawing for explaining a structure of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a drawing for explaining a structure of a backlight of the liquid crystal display device of the first example.

FIG. 3 is a diagram for explaining a structure of a backlight of the liquid crystal display device of the first example.

FIG. 4 is a diagram for explaining a structure of a backlight of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 5 is a view for explaining a structure of a backlight of the liquid crystal display device of the second example.

FIG. 6 is a view for explaining a structure of a backlight of a liquid crystal display device according to a third embodiment of the present invention.

FIG. 7 is a view for explaining a structure of a backlight of a liquid crystal display device of a third example.

FIG. 8 is a view for explaining a structure of a backlight of a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 9 is a drawing for explaining a structure of a backlight of a liquid crystal display device of a fourth example.

FIG. 10 is a diagram for explaining a structure of a backlight of a liquid crystal display device of a fourth example.

FIG. 11 is a diagram illustrating a structure of a backlight of a liquid crystal display device according to a fifth example of an embodiment of the present invention.

FIG. 12 is a drawing for explaining a structure of a backlight of a liquid crystal display device of a fifth example.

FIG. 13 is a view for explaining a structure of a backlight of a liquid crystal display device according to a modified example of the fifth example.

[Explanation of symbols]

100, 100A, 100B, 100C, 100D, 1
00E backlight 101 transparent substrate 102 anode 103r organic EL layer (red) 103g organic EL layer (green) 103b organic EL layer (blue) 103re electron transport layer of organic EL layer (red) 103ge electron transport of organic EL layer (green) Layer 103be Electron transport layer of organic EL layer (blue) 103h Electron transport layer of organic EL layer 103rh Electron transport layer of organic EL layer (red) 103gh Electron transport layer of organic EL layer (green) 103bh Electron transport layer of organic EL layer (blue) Electron transport layer 104 Cathode 108 Partition resist 108a Opening 109r Organic EL region (red) 109g Organic EL region (green) 109b Organic EL region (blue) 113 Anode 119 Low resistance wiring 124 Cathode 200 Liquid crystal display panel

 ────────────────────────────────────────────────── ─── Continued on the front page F-term (reference) 2H091 FA41Z FA44Z GA11 HA12 HA18 LA11 LA16 3K007 AB02 AB17 BA01 CA01 CB01 DA02 EB00 FA01 5C094 AA07 AA10 AA15 AA22 BA03 BA12 BA29 BA43 BA44 CA19 CA24 EA04 EA05 A04 ED02 A04 ED02 AA18 BB05 BB12 BB15 CC12 EE26 FF05 GG12 GG25 GG26 GG27 LL07

Claims (6)

[Claims] 1. A liquid crystal display device comprising: a liquid crystal display panel driven by a field sequential system; and a backlight provided on the back side of the liquid crystal display panel, wherein the backlight has different colors. A liquid crystal display device, wherein two or more types of organic EL regions that emit light are arranged on a transparent substrate so as to be dispersed for each type, and are capable of sequentially emitting light of different colors. 2. The liquid crystal display device according to claim 1, wherein the organic EL region of the backlight is formed in a stripe shape, and the organic EL region includes an organic EL layer and the organic EL layer.
The organic EL device includes an anode and a cathode disposed so as to sandwich the L layer, and the partition wall for separating each organic EL layer between the organic EL layers in each organic EL region on the transparent substrate has a stripe shape. A liquid crystal display device formed along an EL region, wherein an organic EL layer is formed in a stripe shape by injecting a material for the organic EL layer between the partition portions. 3. The liquid crystal display device according to claim 1, wherein the anode is formed on the glass substrate as a transparent common electrode in a planar shape over each organic EL region, and a stripe is formed on the anode. While the organic EL layer is formed in a shape, a low-resistance wiring having a lower resistance than the anode is formed between the organic EL layers, and the low-resistance wiring is covered on the low-resistance wiring. A partition for separating the organic EL layers is formed, and the cathode is provided on the organic EL layer for each organic EL region or for the same type of organic E layer.
A liquid crystal display device formed as an independent electrode for each L region. 4. The liquid crystal display device according to claim 1, wherein the organic EL region includes an organic EL layer, and a first electrode and a second electrode for allowing a current to flow through the organic EL layer. Is formed such that a part of the charge transport region overlaps with the first electrode provided on the transparent substrate, and another portion of the charge transport region does not overlap with the first electrode. A liquid crystal display device characterized by the above-mentioned. 5. The liquid crystal display device according to claim 1, wherein the organic EL region is formed on a transparent substrate, and an organic EL layer that emits light emitted according to a current flowing inside the organic EL region toward the transparent substrate. A liquid crystal display device comprising: an anode formed on the organic EL layer; and a cathode formed on the organic EL layer so as to be separated from the anode. 6. The liquid crystal display device according to claim 1, wherein said organic EL region is formed on an anode formed on a transparent substrate; and said organic EL region is formed on said anode, and is capable of transporting charges in a plane direction. A first charge transport layer that is part of the EL layer; a second charge transport layer that is formed on the first charge transport layer and that is part of the organic EL layer; A liquid crystal display device comprising: a cathode formed on the second charge transport layer.