Patent Application
20240090277
The present disclosure relates to a display device including a light-emitting element.
In recent years, display devices including such light-emitting elements as, for example, quantum-dot light-emitting diodes (QLEDs), or organic light-emitting diodes (OLEDs) have attracted widespread attention.
In these display devices, the light-emitting elements typically include reflective electrodes to release light from the light-emitting elements. The display devices have problems: the reflective electrodes reflect external light, which makes it difficult to see an image; and when the light-emitting elements do not emit light, it is difficult to present perfect black.
Patent Document 1 discloses a display device including OLEDs. Each OLED includes a light-blocking member and a polarizing plate to reduce reflection of external light caused by a reflective electrode.
However, in the display device described in Patent Document 1, the polarizing plates provided toward an observer are provided to the entire surface of the display region. Hence, all the light emitted from the light-emitting elements passes through the polarizing plates. The light emitted from the light-emitting elements is polarized randomly, and approximately half of the light emitted from the light-emitting elements is absorbed into the polarizing plates. A problem here is that the light to be released from the light-emitting elements inevitably decreases in intensity.
An aspect of the present disclosure is conceived in view of the above problem, and intended to provide a display device that reduces visibility of external light reflected on a reflective electrode and that releases much light from a light-emitting element.
In order to solve the above problem, a display device according to the present disclosure includes:
a light-emitting element provided on a substrate, and including a first electrode that reflects visible light, a second electrode that transmits visible light, and a light-emitting layer provided between the first electrode and the second electrode;
a subpixel that is a light-emitting region in plan view of the light-emitting element;
a polarizing plate provided on the light-emitting element disposed in a light emission direction in which light is emitted from the light-emitting element, the polarizing plate partially overlapping with the subpixel in plan view; and
a light-blocking layer provided at least partially around the subpixel and raised higher in the light emission direction than the polarizing plate.
An aspect of the present disclosure can provide a display device that reduces visibility of external light reflected on a reflective electrode (a first electrode) and that releases much light from a light-emitting element.
Described below are embodiments of the present invention, with reference to
As illustrated in
As illustrated in
The red subpixel RSP is a light-emitting region in plan view of a light-emitting element (a light-emitting element that emits a red light) to be described later. The green subpixel GSP is a light-emitting region in plan view of a light-emitting element (a light-emitting element that emits a green light) to be described later. The blue subpixel BSP is a light-emitting region in plan view of a light-emitting element (a light-emitting element that emits a blue light) to be described later.
The display region DA of the display device 30 illustrated in
As illustrated in
This embodiment exemplifies a case where the light-emitting element 20 includes: the first electrode 2 that reflects visible light and serves as an anode; the second electrode 7 that transmits visible light and serves as a cathode; the light-emitting layer 5 that serves as a light-emitting layer containing quantum dots (QDs); a hole transport layer 4 provided between the first electrode 2 and the light-emitting layer 5; and an electron transport layer 6 provided between the light-emitting layer 5 and the second electrode 7. However, the light-emitting element 20 shall not be limited to such a case. For example, the light-emitting element 20 may further include: a not-shown hole injection layer between the first electrode 2 and the hole transport layer 4; and a not-shown electron injection layer between the electron transport layer 6 and the second electrode 7. Furthermore, between the first electrode 2 and the light-emitting layer 5, at least one of the hole transport layer 4 or the not-shown hole injection layer may be omitted as appropriate. Between the light-emitting layer 5 and the second electrode 7, at least one of the electron transport layer 6 or the not-shown electron injection layer may be omitted as appropriate.
This embodiment exemplifies a case where the display device 30 includes the light-emitting element 20 of a top-emission type. However, the display device 30 shall not be limited to such a case. The display device 30 may include a bottom-emission light-emitting element. Such case will be described later in a seventh embodiment.
As illustrated in
This embodiment exemplifies a case where the display device 30 includes a bank 3. However, the display device 30 shall not be limited to such a case. The display device 30 may omit the bank 3. As illustrated in
The light-emitting element 20 has a light-emitting region in plan view, and the light-emitting region in plan view is determined in accordance with a region in which the first electrode 2, the light-emitting layer 5, and the second electrode 7 overlap with one another in plan view. In the case of the light-emitting element 20, the light-emitting layer 5 is smaller in size than the first electrode 2 or the second electrode 7. Hence, the size of the light-emitting layer 5 determines the light-emitting region of the light-emitting element 20 in plan view.
The substrate 1 includes: a support substrate; a transistor (not shown) for driving the light-emitting element 20; a wire electrically connected to each electrode of the transistor, and various insulating films. The support substrate may be either, for example, a resin substrate formed of polyimide, or a glass substrate.
The first electrode 2 that reflects visible light can be formed of an electrode material that reflects visible light. The electrode material that reflects visible light may be any given material as long as the material can reflect visible light and conduct electricity. An example of the electrode material includes: a metal material such as Al, Mg, Li, or Ag; an alloy of the metal materials; a multilayer stack of the metal material and a transparent metal oxide (for example, indium tin oxide, indium zinc oxide, or indium gallium zinc oxide); or a multilayer stack of the alloy and the transparent metal oxide.
Meanwhile, the second electrode 7 that transmits visible light can be formed of an electrode material that transmits visible light. The electrode material that transmits visible light may be any given material as long as the material can transmit visible light and conduct electricity. An example of the electrode material includes a thin film formed of, for example, either: a transparent metal oxide (for example, indium tin oxide, indium zinc oxide, or indium gallium zinc oxide); or a metal material formed of Al, Mg, Li, or Ag.
The bank 3 can be formed of such an organic material as, for example, photosensitive polyimide or photosensitive acrylic. The organic material is applied and, after that, patterned by photolithography to form the bank 3.
The hole transport layer 4 may be formed of any given material as long as the material is a hole-transporting material capable of stably transporting holes into the light-emitting layer 5. In particular, the hole-transporting material exhibits preferably high hole mobility. Furthermore, the hole-transporting material is preferably a material (an electron blocking material) capable of preventing penetration of electrons moving from the cathode.
The not-shown hole injection layer may be formed of any given material as long as the material is a hole injection material capable of stably injecting the holes into the light-emitting layer 5.
This embodiment exemplifies a case where the light-emitting layer 5 contains quantum dots (QDs); that is, the light-emitting layer 5 is a light-emitting layer designed for QLEDs. However, the light-emitting layer 5 shall not be limited to such a case. The light-emitting layer 5 is, for example, a light-emitting layer formed by evaporation and designed for OLEDs.
This embodiment exemplifies a case where the display device 30 includes QLEDs alone as light-emitting elements. However, the display device 30 shall not be limited to such a case. The display device 30 may include at least QLEDs or OLEDs.
A red subpixel RSP illustrated in
The light-emitting layer 5 containing quantum dots (QDs), and formed in the configuration below, can serve as, for example, any one of a light-emitting layer emitting a red light, a light-emitting layer emitting a green light, and a light-emitting layer emitting a blue light. In order for the light-emitting element 20, which includes the light-emitting layer 5 containing quantum dots (QDs), to emit light in different colors, the light-emitting layer 5 may be formed of cores made of the same material and having different particle sizes. For example, cores having the largest particle size may be used for a light-emitting layer that emits a red light. Cores having the smallest particle size may be used for a light-emitting layer that emits a blue light. Cores having a particle size between the particle sizes of the cores used for the light-emitting layer that emits the red light and for the light-emitting layer that emits the blue light may be used for a light-emitting layer that emits a green light. In order for the light-emitting element 20, which includes the light-emitting layer 5 containing quantum dots (QDs), to emit light in different colors, the light-emitting layer 5 may be formed of cores made of different materials.
The electron transport layer 6 may be formed of any given material as long as the material is an electron-transporting material capable of transporting the electrons injected from the cathode into the light-emitting layer 5. In particular, the electron-transporting material exhibits preferably high electron mobility. Furthermore, the electron-transporting material is preferably a material (a hole blocking material) capable of preventing penetration of holes moving from the anode. Such a feature can increase efficiency in recombination of the holes and the electrons in the light-emitting layer 5.
The not-shown electron injection layer may be formed of any given material as long as the material is an electron-injecting material capable of stably injecting the electrons into the light-emitting layer 5.
This embodiment exemplifies a case where, as illustrated in
The quarter-wave plate 8 can achieve the following feature. External light passes through the polarizing plate 9 to be polarized light. After that, the polarized light passes through the quarter-wave plate 8, and is reflected on the first electrode 2 that reflects visible light. After that, when the polarized light passes through the quarter-wave plate 8 again, the quarter-wave plate 8 can prevent the polarized light from passing through the polarizing plate 9. Such a feature can reduce visibility of the external light reflected on the first electrode 2 that reflects visible light.
Note that the polarizing plate 9 alone can reduce the amount of external light polarized randomly and incident on the first electrode 2 included in the light-emitting element 20 and reflective to visible light. Such a feature can reduce visibility of the external light reflected on the first electrode 2 that reflects visible light.
The quarter-wave plate 8 may be formed by any given manner. For example, the quarter-wave plate 8 may be attached or applied.
As illustrated in
According to the above configuration, the polarizing plate 9 is provided to partially overlap with each of the red subpixel RSP, the green subpixel GSP, and the blue subpixel BSP in plan view. Hence, in plan view, the polarizing plate 9 does not overlap with the remaining portion of each of the red subpixel RSP, the green subpixel GSP, and the blue subpixel BSP. As a result, much light can be released from the remaining portion of each of the red subpixel RSP, the green subpixel GSP, and the blue subpixel BSP. Furthermore, the light-blocking layer 10 can reduce incoming external light. Such a feature can reduce reflection of external light on the first electrode 2. Moreover, the light-blocking layer 10 can block external light reflected on the first electrode 2. Such a feature can reduce visibility of the external light reflected on the first electrode 2. In addition, the polarizing plate 9 can reduce reflection of external light on the first electrode 2 and reduce visibility of the reflected external light on the first electrode 2.
Thanks to such features, the display device 30 can reduce visibility of external light reflected on the first electrode 2 and release much light from the light-emitting element 20.
This embodiment exemplifies a case where, as illustrated in
Thanks to the above configuration, the light-blocking layer 10 includes a portion formed linearly. Such a feature allows the polarizing plate 9 to be formed by a technique other than patterning; that is, for example, attaching a linear polarizing plate.
In this embodiment, as illustrated in
The light-emitting element 20 of this embodiment is produced by application of a light-emitting material containing a solvent and quantum dots (QDs) dispersed in the solvent. As to such a light-emitting element, if the light-emitting layer 5 is formed thicker in a peripheral portion than in a center portion because of surface tension of the solvent, luminance of emitted light is likely to be higher in a peripheral portion than in a center portion of each of the red subpixel RSP, the green subpixel GSP, and the blue subpixel BSP. Thanks to such a configuration, the polarizing plate 9 is provided to overlap in plan view with the center portion of each of the red subpixel RSP, the green subpixel GSP, and the blue subpixel BSP. In the case of a display device whose luminance of emitted light is lower in the center portion than in the peripheral portion of each of the red subpixel RSP, the green subpixel GSP, and the blue subpixel BSP, much light can be released from the light-emitting element 20.
The polarizing plate 9 may be, for example, attached. As will be described later, the polarizing plate 9 may be formed by application, exposure to light, development, and patterning. The polarizing plate 9 may be formed by any given technique.
The light-blocking layer 10 may be formed of a light-blocking material. This embodiment exemplifies a case where the light-blocking layer 10 contains a material absorbing visible light. However, the light-blocking layer 10 may be formed of any given material. An example of the material absorbing visible light includes, but not limited to, carbon black. In this embodiment, the light-blocking layer 10 is formed, for example, as follows. A negative photosensitive resin, which contains a sufficient amount of carbon black to shield light, is applied, exposed to light, and developed to form the light-blocking layer 10 having a predetermined shape and height.
If the light-blocking layer 10 contains a material that absorbs visible light, the light-blocking layer 10 can further reduce reflection of external light on the first electrode 2 and further reduce visibility of the external light reflected on the first electrode 2.
This embodiment exemplifies a case where, as illustrated in
According to the above configuration, the light emitting element 20 has an upper portion, other than the polarizing plate 9, covered with the transparent plate 10. Such a feature can improve reliability of the display device 30.
As illustrated in
This embodiment exemplifies a case where, as illustrated in
According to the above configuration, the light-blocking layer 10 does not overlap with each of the red subpixel RSP, the green subpixel GSP, and the blue subpixel BSP in plan view. Such a feature makes it possible to release much light from the light-emitting element 20.
In this embodiment, as illustrated in
Note that, if the light-blocking layer 10 and a sealing glass 11 can seal a gas forming the sealing layer 12, a step of attaching the sealing glass 11 to the light-blocking layer 10 is carried out in, for example, a nitrogen atmosphere. Hence, the sealing layer 12 can be formed of nitrogen. On the other hand, if neither the light-blocking layer 10 nor the sealing glass 11 can seal the gas forming the sealing layer 12, the sealing layer 12 is formed of air. According to the configuration, the sealing layer 12 having a refractive index n of 1 can be provided in the light emission direction LD in which light is emitted from the light-emitting element 20.
Furthermore, in
As illustrated in
As illustrated in
As illustrated in
As can be seen, the display device 30 can release much light from the light-emitting element 20, in particular in the front.
As illustrated in
As illustrated in
As illustrated in
As can be seen, the display device 30 can reduce reflection of external light on the first electrode 2 that reflects visible light. Such a feature can reduce visibility of external light reflected on the first electrode 2 that reflects visible light.
As to the display device 30 of this embodiment, the region in which the polarizing plate 9 is provided is preferably determined as follows.
When any given point of each subpixel RSP, GSP, and BSP, which is a light-emitting region of the light-emitting element 20 in plan view, is set as an origin, φ is any given angle, on a plane passing through the origin, with respect to the first axis on the plane, and θ is any given angle with respect to the second axis R perpendicular to the first axis in a vertical direction from each subpixel RSP, GSP, and BSP. When the angle φ varies within a range of 0° or more and 360° or less, and the light the angle θ of which varies within a range of 0° or more and 60° or less is emitted toward each subpixel RSP, GSP, and BSP, the light-blocking layer 10 preferably creates a shadow region on each subpixel RSP, GSP, and BSP, and the polarizing plate 9 is provided in a region preferably out of the shadow region.
As can be seen, if the region in which the polarizing plate 9 is provided is determined, the polarizing plate 9 can be provided only in a region where the polarizing plate 9 works effectively. Such a feature allows the display device 30 to further release much light toward the front.
When H represents a height of the light-blocking layer 10, and W represents a length of a longest line among lines: on a plane on which the light-blocking layer 10 is formed; perpendicular to the light-blocking layer 10 and the polarizing plate 9; and between the light-blocking layer 10 and the polarizing plate 9, the height H of the light-blocking layer 10 and the length W of the longest line are preferably determined so that θ1≤45° is satisfied where θ1 is defined as tan θ1=W/H and 0°<θ1<90°.
When the longest line W and the height H of the light-blocking layer 10 are determined to satisfy θ1≤45°, if the user views the display region DA of the display device 30 at the angle θ with respect to the second axis R, and the angle θ is within a range of 0°≤θ<θ1 where θ1≤45° holds (if the user views the display region DA from the front), the user is positioned in the front, and it is unlikely that the external light enters. Such a feature can reduce reflection of external light close to the front.
When H represents a height of the light-blocking layer 10, and L represents a width, of each subpixel RSP, GSP, and the BSP, on a plane where the light-blocking layer 10 is formed, and the width is perpendicular to the light-blocking layer 10, the height H of the light-blocking layer 10 and the width L of each subpixel RSP, GSP, and BSP are preferably determined so that θ2≤60° is satisfied where θ2 is represented as tan θ2=L/H and 0°<θ2<90°.
When the height H of the light-blocking layer 10 and the width L of each subpixel RSP, GSP, and BSP are determined to satisfy θ2≤60°, the display region DA can be viewed if the angle θ, of the light emitted from the light-emitting element 20, with respect to the second axis R is within a range of at least 0° to 60°.
In this embodiment, the height H of the light-blocking layer 10 is set to 36 μm, the width L of each subpixel RSP, GSP, and BSP is set to 100 μm, and the length W of the longest straight line is set to 31 μm so that, for example, θ1 is set to 40° and θ2 is set to 70°.
As illustrated in
As illustrated in
As illustrated in
As illustrated in
In a known example illustrated in
In the case of the first embodiment illustrated in
As can be seen, the display device 30 is designed to release much light from the light-emitting element 20 particularly in the front. Furthermore, if a user views the display region DA of the display device 30 at the angle θ with respect to the second axis R, and the angle θ is within a range of 71° to 90°, the display region cannot be viewed. Hence, when the display device 30 is applied to, for example, a mobile display device, the display device can protect privacy of the user.
This embodiment exemplifies a case where the polarizing plate 9 is attached. However, the polarizing plate 9 shall not be limited to such a case, and may be formed as will be described below.
As illustrated in
As illustrated in
The inspection polarizing plate 19 placed on the polarizing plate 9 can block light emitted from a center portion of each subpixel RSP, GSP, and BSP. Such a feature allows for inspection of light emitted only from an outer edge other than the center portion of each subpixel RSP, GSP, and BSP. Note that the outer edge other than the center portion of each subpixel RSP, GSP, and BSP is likely to suffer unevenness in coating and thickness caused by, for example, the bank 3.
Described next is a second embodiment of the present invention, with reference to
As illustrated in
The display device 30a includes the sealing layer 14 made of resin or an inorganic film. The sealing layer 14 can improve reliability of the display device 30a.
As illustrated in
When the refractive index n of the sealing layer 14, the height H of the light-blocking layer 10a, and the longest line W are determined to satisfy θ1≤45°, if the user views the display region DA of the display device 30a at the angle θ with respect to the second axis R, and the angle θ is within a range of 0°≤θ<θ1 where θ1≤45° holds (if the user views the display region DA from the front), the user is positioned in the front, and it is unlikely that the external light enters. Hence, external light reflected close to the front can be reduced.
As illustrated in
When the refractive index n of the sealing layer 14, the height H of the light-blocking layer 10a, and the width L of each subpixel RSP, GSP, and BSP are determined to satisfy θ2≤60°, the display region DA can be viewed if the angle θ, of the light emitted from the light-emitting element 20, with respect to the second axis R is within a range of at least 0° to 60°.
While θ2 illustrated in
In this embodiment, the height H of the light-blocking layer 10a is set to 124 μm, the width L of each subpixel RSP, GSP, and BSP is set to 100 μm, and the length W of the longest straight line is set to 29 μm. Furthermore, the sealing layer 14 is formed of a material having a refractive index n of 1.5.
Note that θ′1 and θ′2 are smaller than a critical angle θc=42° where the sealing layer 14 has a refractive index n of 1.5, θ′1 is 13°, and θ′2 is 39°.
Described next is a third embodiment of the present invention, with reference to
As illustrated in
Thanks to the above feature, a space is formed between the plurality of island-shaped light-blocking walls. Utilizing such a space, the polarizing plate 9a can be provided by a method other than patterning. For example, the polarizing plate 9a may be formed linearly and attached.
As illustrated in
As illustrated in
Thanks to such a feature, the display device 30b can reduce visibility of external light reflected on the first electrode 2 in either the horizontal direction or the vertical direction, and release much light in the front. Furthermore, in the case of a display device whose luminance of emitted light is lower in the center portion than in the peripheral portion of each of the subpixel RSP, GSP, and BSP, much light can be released from the light-emitting element 20.
Described next is a fourth embodiment of the present invention, with reference to
As illustrated in
Thanks to such a feature, the display device 30c can reduce visibility of external light reflected on the first electrode 2 in either the horizontal direction or the vertical direction.
As illustrated in
Thanks to such a feature, the display device 30c can reduce visibility of external light reflected on the first electrode 2 in either the horizontal direction or the vertical direction, and release much light in the front. Furthermore, in the case of a display device whose luminance of emitted light is lower in the center portion than in the peripheral portion of each of the subpixel RSP, GSP, and BSP, much light can be released from the light-emitting element 20.
Described next is a fifth embodiment of the present invention, with reference to
As illustrated in
Such a feature eliminates the need of aligning the bank 3 and the light-blocking layer 10d.
Note that the modification of the display device according to the fifth embodiment illustrated in
Described next is a sixth embodiment of the present invention, with reference to
As illustrated in
Note that, in the display device 30d, the polarizing plate 9 may be formed to cover the entire pixel PIX other than a right end and a left end of the pixel PIX. This is because the right end and the left end of the pixel PIX are shadow regions of the light-blocking layer 10e, and the polarizing plate 9 does not have to be provided to such shadow regions.
Described next is a seventh embodiment of the present invention, with reference to
As illustrated in
As illustrated in
Note that the modification of the display device according to the seventh embodiment illustrated in
First Aspect
A display device including: a light-emitting element provided on a substrate, and including a first electrode that reflects visible light, a second electrode that transmits visible light, and a light-emitting layer provided between the first electrode and the second electrode;
a subpixel that is a light-emitting region in plan view of the light-emitting element;
a polarizing plate provided on the light-emitting element disposed in a light emission direction in which light is emitted from the light-emitting element, the polarizing plate partially overlapping with the subpixel in plan view; and
a light-blocking layer provided at least partially around the subpixel and raised higher in the light emission direction than the polarizing plate.
Second Aspect
The display device according to the first aspect, wherein the light-blocking layer includes a first light-blocking wall formed linearly and a second light-blocking wall formed linearly, the first light-blocking wall and the second light-blocking wall being formed respectively along two opposing sides of the subpixel.
Third Aspect
The display device according to the second aspect, wherein the polarizing plate includes a linear portion positioned intermediately between the first light-blocking wall and the second light-blocking wall, the linear portion being formed apart from the light-blocking layer.
Fourth Aspect
The display device according to the first aspect, wherein the light-blocking layer includes a plurality of island-shaped light-blocking walls surrounding only corners of the subpixel.
Fifth Aspect
The display device according to the fourth aspect, wherein the polarizing plate is provided from a center of the subpixel to a plurality of end portions included in the subpixel and not covered with a corresponding one of the plurality of island-shaped light-blocking walls.
Sixth Aspect
The display device according to the first aspect, wherein the light-blocking layer is formed to surround the subpixel.
Seventh Aspect
The display device according to the sixth aspect, wherein the polarizing plate is spaced apart from the light-blocking layer, and
the polarizing plate overlaps with a center portion of the subpixel in plan view.
Eighth Aspect
The display device according to any one of the first to seventh aspects, further including a transparent plate provided on the light-emitting element to surround the polarizing plate,
wherein the light-blocking layer is provided on the transparent plate.
Ninth Aspect
The display device according to fourth or fifth aspect, wherein the subpixel is formed in a rectangular shape, and
the plurality of island-shaped light-blocking walls are provided to respective four corners of the subpixel in the rectangular shape.
Tenth Aspect
The display device according to any one of the first to ninth aspects, further including a bank covering an end portion of either the first electrode or the second electrode,
wherein the light-blocking layer overlaps at least partially with the bank.
Eleventh Aspect
The display device according to any one of the first to tenth aspects, wherein light-blocking layer contains a material that absorbs visible light.
Twelfth Aspect
The display device according to any one of the first to tenth aspect, further including a bank covering an end portion of either the first electrode or the second electrode,
wherein the light-blocking layer has a material formed on an upper surface of the bank to absorb visible light.
Thirteenth Aspect
The display device according to any one of the first to twelfth aspect, wherein, wherein, when any given point of the subpixel is set as an origin, φ is any given angle, on a plane passing through the origin, with respect to a first axis on the plane, and θ is any given angle with respect to a second axis perpendicular to the first axis in a vertical direction from the subpixel, and
when the angle φ varies within a range of 0° or more and 360° or less, and light the angle θ of which varies within a range of 0° or more and 60° or less is emitted toward the subpixel, the light-blocking layer creates a shadow region on the subpixel, and
the polarizing plate is provided in a region out of the shadow region.
Fourteenth Aspect
The display device according to any one of the first to thirteenth aspect, further including a sealing layer provided to cover the polarizing plate, and to thoroughly overlap at least with the subpixel.
Fifteenth Aspect
The display device according to the fourteenth aspect, wherein, when n represents a refractive index of the sealing layer,
H represents a height of the light-blocking layer, and
W represents a length of a longest line among lines: on a plane on which the light-blocking layer is formed; perpendicular to the light-blocking layer and the polarizing plate; and between the light-blocking layer and the polarizing plate,
the refractive index n, the height H, and the length W of the longest line are determined so that θ1≤45° is satisfied where θ1 is defined as sin θ1=n*sin θ′1 and 0°<θ1<90° whereas θ′1 is defined as tan θ′1=W/H and 0°<θ′1<90°.
Sixteenth Aspect
The display device according to the fourteenth or fifteenth aspect, wherein, wherein, when n represents a refractive index of the sealing layer,
H represents a height of the light-blocking layer, and
L represents a width, of the subpixel, on a plane on which the light-blocking layer is formed, and the width is perpendicular to the light-blocking layer,
the refractive index n, the height H, and the width L of the subpixel are determined so that θ2≤60° is satisfied where θ2 is defined as sin θ2=n*sin θ′2 and 0°<θ2<90° whereas θ′2 is defined as tan θ′2=L/H and 0°<θ′2<90°.
Seventeenth Aspect
The display device according to any one of the first to sixteenth aspect, further including a quarter-wave plate provided between the light-emitting element and the polarizing plate to overlap at least with the polarizing plate.
The present invention shall not be limited to the embodiments described above, and can be modified in various manners within the scope of claims. The technical aspects disclosed in different embodiments are to be appropriately combined together to implement another embodiment. Such an embodiment shall be included within the technical scope of the present invention. Moreover, the technical aspects disclosed in each embodiment may be combined together to achieve a new technical feature.
The present invention can be applied to a display device.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2021/004082 | 2/4/2021 | WO |
