Display device, imaging device, and electronic apparatus

Abstract

This display device comprises: a light-emitting element array including a plurality of light-emitting elements disposed on a substrate; and a color filter layer including, on the light-emitting element array, a plurality of first band-pass filters that transmit light in a first band, a plurality of second band-pass filters that transmit light in a second band different from the first band; and a plurality of third band-pass filters that transmit light in a third band different from the first band and the second band. The color filter layer is an array having at least a first column in which the first band-pass filters are arrayed, a second column in which the second band-pass filters and the third band-pass filters are alternately arrayed, and a third column in which the second band-pass filters and the third band-pass filters are alternately arrayed in a different order from that of the second column, and at least one of the first band-pass filters is in contact with at least one of the second band-pass filters and at least one of the third band-pass filters.

Description

Display device, imaging device and electronic device

[0001] The present invention relates to a display device, an imaging device, and an electronic device.

[0002] Liquid crystal display devices and organic electroluminescence (EL) display devices are well-known representative examples of display devices. Organic EL display devices have advantages such as a high degree of freedom in shape and thin, lightweight panels. Organic EL display devices are classified into two types: a color-coded type, in which each sub-pixel generates a different color of light, and a white type, in which each sub-pixel generates white light and separates it using a color filter. The color-coded type has the advantage of low power consumption, but the disadvantage of being difficult to achieve high resolution because it is manufactured using a metal mask. The white type has the disadvantage of high power consumption because it uses color filters to express colors, but the advantage of being easy to achieve high resolution because the pixel pitch can be reduced using photolithography technology.

[0003] To overcome the drawback of the color-separated type, which makes it difficult to achieve high resolution, a technology has emerged in which subpixels are arranged in a pentile array. The traditional pentile array takes advantage of the human characteristic of being sensitive to green, and achieves pseudo-high resolution by arranging green subpixels at a high density and red and blue subpixels at a low density. The pentile array can achieve pseudo-higher resolution than the actual resolution, which has the added benefit of reducing the number of data lines. A display device using such a pentile array is described in Patent Document 1.

[0004] Japanese Patent Application Laid-Open No. 2020-205260

[0005] One aspect of the present invention is a display device including: a light-emitting element array including a plurality of light-emitting elements arranged on a substrate; and a color filter layer on the light-emitting element array, the color filter layer including a plurality of first band filters that transmit light of a first band, a plurality of second band filters that transmit light of a second band different from the first band, and a plurality of third band filters that transmit light of a third band different from the first band and the second band, wherein the color filter layer has an arrangement having at least a first row in which the first band filters are arranged, a second row in which the second band filters and the third band filters are arranged alternately, and a third row in which the second band filters and the third band filters are arranged alternately in an order different from that of the second row, and at least one of the first band filters is in contact with at least one of the second band filters and at least one of the third band filters.

[0006] Another aspect of the present invention is a display device comprising: a light-emitting element array including a plurality of light-emitting elements arranged on a substrate; and a color filter layer arranged on the light-emitting element array, the color filter layer including a plurality of first band filters that transmit light of a first band, a plurality of second band filters that transmit light of a second band different from the first band, and a plurality of third band filters that transmit light of a third band different from the first band and the second band, wherein the color filter layer has an arrangement in which the first band filters are arranged in a delta arrangement, the number of the second band filters and the third band filters is smaller than the number of the first band filters, and at least one of the first band filters is in contact with at least one of the second band filters and at least one of the third band filters.

[0007] FIG. 1 is a diagram showing the configuration of a display device according to a first embodiment. FIG. 1 is a diagram showing the configuration of a display device according to a first embodiment. FIG. 1 is a diagram showing the configuration of a display device according to a first embodiment. FIG. 1 is a diagram showing the configuration of a display device according to a first embodiment. FIG. 2 is a diagram showing the configuration of a modified example of the display device according to the first embodiment. FIG. 2 is a diagram for explaining reduction in color mixing by providing a microlens array. FIG. 3 is a diagram for explaining reduction in color mixing by providing a microlens array. FIG. 3 is a diagram showing the configuration of a display device according to a second embodiment. FIG. 4 is a diagram showing the configuration of a display device according to a third embodiment. FIG. 5 is a diagram showing the configuration of a display device according to a fourth embodiment. FIG. 6 is a diagram showing the configuration of a display device according to a fifth embodiment. FIG. 7 is a diagram showing the configuration of a display device according to a seventh embodiment. FIG. 8 is a diagram showing the configuration of a display device according to a ninth embodiment. FIG. 9 is a diagram showing the configuration of a display device according to a tenth embodiment. FIG. 10 is a diagram for explaining techniques that can be applied to the first to tenth embodiments. FIG. 11 is a diagram for explaining techniques that can be applied to the first to tenth embodiments. FIG. 14 is a diagram for explaining a technique that can be applied to the first to tenth embodiments. FIG. 15 is a diagram for explaining an application example. FIG. 16 is a diagram for explaining an application example. FIG. 17 is a diagram for explaining an application example. FIG.

[0008] The following embodiments are described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the claimed invention. Although the embodiments describe multiple features, not all of these features are necessarily essential to the invention, and multiple features may be combined in any desired manner. Furthermore, in the accompanying drawings, identical or similar components are designated by the same reference numerals, and redundant description will be omitted. In this specification, shapes described as squares, hexagons, octagons, etc. are expressions that allow for manufacturing errors and may include, for example, shapes with rounded corners. For example, shapes expressed as polygons such as squares, hexagons, and octagons may include figures that are inscribed in a strict mathematical polygon and whose area differs from the strict polygon by less than 20%, 15%, 10%, or 5%.

[0009] In the accompanying drawings, components with the same pattern are intended to represent components with the same features and characteristics, for example, color filters (band filters) with the same pattern transmit light of the same band, in other words, color filters of the same color.

[0010] As described above, the Pentile arrangement has been used to overcome the disadvantages of color-coded organic EL display devices. The inventors, however, investigated the application of this arrangement to the color filter layer of a white-type organic EL display device. The color filter layer can be formed with high density (high definition) using lithography technology, and in the white-type organic EL display device, the light-emitting element array can be formed with high density (high definition) using lithography technology. Therefore, by applying the Pentile arrangement to the color filter layer of a white-type organic EL display device, it is possible to realize a pseudo-resolution higher than the actual resolution determined by the number of data lines.

[0011] FIG. 1A shows a plan view of the color filter layer CFL of the display device of the first embodiment, and FIG. 1B shows a plan view of the microlens layer MLL of the display device of the first embodiment. The shape of the lens portion of the microlens layer MLL in a plan view may be an inscribed circle of the shape of the color filter layer CFL in a plan view. The lens portion of the microlens layer MLL refers to a portion that forms a recess or protrusion in the organic EL display device and contributes to light collection. FIG. 2 shows an opening OP provided in the bank BNK of the display device of the first embodiment. The opening OP may be circular in a plan view. When a microlens is provided, the ratio of the area of ​​the opening OP to the area of ​​the microlens in a plan view may be 10% to 50%, preferably 20% to 40%. In other words, the ratio of the area of ​​the microlens to the area of ​​the opening OP in a plan view may be 0.32 to 0.71:1, and preferably 0.45 to 0.63:1. Furthermore, the opening OP may be polygonal to match the shape of the color filter in a plan view. Specifically, it may be rectangular or octagonal. FIG. 3 shows a cross-sectional view of the display device of the first embodiment. FIG. 3 corresponds to the cross section A-A' in FIG. 1A. FIG. 4 shows a cross-sectional view illustrating a modified example of the display device of the first embodiment. FIG. 4 corresponds to the cross section A-A' in FIG. 1A. The modified example of the display device of the first embodiment does not have a microlens layer.

[0012] The display device of the first embodiment includes a light-emitting element array LEDA including a plurality of light-emitting elements LED arranged on a substrate S, and a color filter layer CFL including a plurality of color filters arranged in a pentile array on the light-emitting element array LEDA. Each light-emitting element LED generates white light. In another aspect, each light-emitting element LED generates light including red, green, and blue wavelengths. The light-emitting element that generates white light can have a small distance between pixels due to its manufacturing process. The distance between pixels may be one side of the unit pixel area PU in FIGS. 1A and 1B . Specifically, the distance between pixels may be 12 μm or less, 10 μm or less, or 8 μm or less. The color filters of the color filter layer CFL may include a plurality of first band filters, a plurality of second band filters, and a plurality of third band filters. The first band filters are color filters that transmit light of a first band. The second band filters are color filters that transmit light of a second band different from the first band. The third band filter is a color filter that transmits light of a third band different from the first band and the second band. In this specification, a pentile array is an array having a first column, a second column, and a third column. The first column is a column in which the first band filters are arranged. The second column is a second column in which the second band filters and a plurality of third band filters are alternately arranged. The third column is a column in which the second band filters and the third band filters are alternately arranged in an order different from that of the second column. The first column may be arranged between the second column and the third column in the row direction. The row direction is a direction perpendicular to the direction in which the first band filters are arranged in the first column. Here, at least one first band filter is in contact with at least one second band filter and at least one third band filter. That is, a second band filter in the second column is adjacent to a third band filter in the third column. Depending on the size of the band filters, the first band filter, the second band filter, and the third band filter may be in contact with each other. Here, "contact" does not only mean that the bandpass filters are in direct contact with each other, but also includes that the bandpass filters are in indirect contact with each other via a light absorption layer or the like.

[0013] In the first embodiment, the first band-pass filter is a band-pass filter CFG that transmits green (G) light, the second band-pass filter is a band-pass filter CFR that transmits red (R) light, and the third band-pass filter is a band-pass filter CFB that transmits blue (B) light, although these may be interchanged.

[0014] Here, the areas occupied by the most numerous band filter, the second most numerous band filter, and the third most numerous band filter in the unit pixel region PU are designated A, B, and C, respectively. Here, if there are two types of most numerous band filter among the first, second, and third band filters, the area occupied by one of the filters in the unit pixel region PU may be designated A, and the area occupied by the other filter in the unit pixel region PU may be designated B. The numbers of the first, second, and third band filters may be the same. In this case, the area occupied by any one of the filters in the unit pixel region PU may be designated A, the area occupied by any one of the filters in the unit pixel region PU may be designated B, and the area occupied by the remaining filter in the unit pixel region PU may be designated C.

[0015] In the above conditions, it is preferable that A / B<2·C / B is satisfied, it is more preferable that A / B<1.5·C / B is satisfied, and it is most preferable that A / B<1.2·C / B is satisfied. Alternatively, B and C may have values ​​of A that are less than ±5%.

[0016] The band filter with the largest number of the first, second, and third band filters can be defined as the main band filter, and the area surrounded by the perpendicular bisectors of one main band filter and each of the surrounding main band filters can be defined as a unit pixel area PU including the one main band filter.

[0017] The total areas occupied by the largest number of band-pass filters among the first, second, and third band-pass filters, the second largest number of band-pass filters, and the third largest number of band-pass filters in the light-emitting element array LEDA are defined as TA, TB, and TC, respectively. Here, if there are two types of band-pass filters that are the largest number of filters among the first, second, and third band-pass filters, the total area occupied by one of them in the light-emitting element array LEDA may be defined as TA, and the total area occupied by the other of them may be defined as B. If the numbers of the first, second, and third band-pass filters are the same, the total area of ​​any one of them may be defined as A, the total area of ​​any one of the other may be defined as B, and the total area of ​​the remaining one may be defined as C.

[0018] In the above conditions, it is preferable that TA / TB≦2·TC / TB is satisfied, it is more preferable that TA / TB<1.5·TC / TB is satisfied, and it is most preferable that TA / TB<1.2·TC / TB is satisfied. TB and TC may have values ​​within ±5% of TA.

[0019] 1A and 1B, the ratio A:B:C of the areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the unit pixel area PU is 1:1:1. Therefore, A / B = C / B = 1. Also, in the example shown in Figures 1A and 1B, the ratio TA:TB:TC of the total areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the light-emitting element array LEDA is 1:1:1. Therefore, TA / TB = TC / TB = 1.

[0020] 1A and 1B, the area of ​​the first band-pass filter (CFG) that transmits green light in the unit pixel region PU is equal to the area of ​​the second band-pass filter (CFR) that transmits red light in the unit pixel region PU. Also, in the example shown in FIG. 1A and 1B, the area of ​​the first band-pass filter (CFG) that transmits green light in the unit pixel region PU is equal to the area of ​​the third band-pass filter (CFB) that transmits blue light in the unit pixel region PU. This is advantageous for reducing color contamination from the green subpixel to the red and blue subpixels compared to when the green subpixel has a larger area.

[0021] The multiple first band filters (CFGs in the first embodiment) each have a square shape and are arranged spaced apart from one another in a square lattice pattern. The multiple second band filters (CFRs in the first embodiment) and the multiple third band filters (CFBs in the first embodiment) each have an octagonal shape composed of four pairs of parallel opposite sides. Two second band filters (CFRs) are in line contact with one pair of opposite sides of the square of the first band filter (CFG), and two third band filters (CFBs) are in line contact with another pair of opposite sides of the square of the first band filter (CFG). Two pairs of opposite sides of the four pairs of opposite sides of the second band filter (CFR) that do not contact the first band filter (CFG) are in line contact with two pairs of opposite sides of the four pairs of opposite sides of the third band filter (CFB) that do not contact the first band filter (CFG).

[0022] Here, to reduce color mixing, a light-absorbing layer may be provided between each band-pass filter, so that the band-pass filters are in line contact with each other via the light-absorbing layer. An example of a plan view of a color filter layer CFL with a light-absorbing layer provided between each band-pass filter is shown in FIG. 1C . The first band-pass filter (CFG) and two second band-pass filters (CFR), and the first band-pass filter (CFG) and two third band-pass filters (CFB) are in line contact with each other via the light-absorbing layer BM. Two pairs of opposite sides of the second band-pass filter (CFR) that are not in contact with the first band-pass filter (CFG) are in line contact with two pairs of opposite sides of the third band-pass filter (CFB) that are not in contact with the first band-pass filter (CFG) via the light-absorbing layer BM.

[0023] In one example, the length of two pairs of opposite sides of the second band filter (CFR) that do not contact the first band filter (CFG) is shorter than the length of two pairs of opposite sides of the second band filter (CFR) that make line contact with the first band filter (CFG).Furthermore, the length of two pairs of opposite sides of the third band filter (CFB) that do not contact the first band filter (CFG) is shorter than the length of two pairs of opposite sides of the third band filter (CFB) that make line contact with the first band filter (CFG).

[0024] 1A and 1C, the first embodiment has a plurality of microlenses ML constituting a microlens array MLA. Note that ML is used as a symbol that encompasses both ML1 and ML2, and ML1 and ML2 are used to distinguish between the two types of microlenses ML. The plurality of microlenses ML are arranged such that one microlens ML is assigned to each of a plurality of first band-pass filters, a plurality of second band-pass filters, and a plurality of third band-pass filters. FIG. 1C shows an example in which a light absorption layer BM is provided between the band-pass filters.

[0025] The color filters constituting the color filter layer CFL may be classified into a first group consisting of a plurality of first band filters (CFG), a second group consisting of a plurality of second band filters (CFR), and a third group consisting of a plurality of third band filters (CFB). The microlenses ML may include a plurality of first microlenses ML1 and a plurality of second microlenses ML2. The first microlenses ML1 are microlenses ML assigned to each band filter of one of the three groups (here, CFG). The second microlenses ML2 are microlenses assigned to each band filter of the remaining two of the three groups (here, CFR and CFB). The bottom dimension of the first microlenses ML1 is smaller than the bottom dimension of the second microlenses ML2. The bottom dimension may be, for example, a diameter or a maximum width. In the example of FIG. 1B, if the bottom dimension of the first microlens ML1 is D1 and the bottom dimension of the second microlens ML2 is D2, then D1:D2=1:1.4.

[0026] In an orthogonal projection or plan view of the light-emitting element array LEDA, one first microlens ML1 may be arranged to be in contact with four second microlenses ML2 that are arranged so as not to be in contact with each other. The radius of curvature of the lens surface of the first microlens ML1 may be smaller than the radius of curvature of the lens surface of the second microlens ML2.

[0027] Here, with reference to FIGS. 5A and 5B , the effect of disposing a microlens ML or a microlens layer MLL on a color filter layer CFL will be described. Light L can be emitted from the light-emitting element LED not only in the normal direction to the surface of the substrate but also in oblique directions. Without a microlens ML, the light L emitted obliquely from the light-emitting element LED may pass through the color filter assigned to the adjacent light-emitting element rather than the color filter assigned to that light-emitting element LED. This causes color mixing. On the other hand, with a microlens ML, the light L emitted obliquely from the light-emitting element LED may pass through the color filter assigned to the adjacent light-emitting element rather than the color filter assigned to that light-emitting element LED. However, most of the light L that passes through the color filter assigned to the adjacent light-emitting element is then totally reflected by the microlens ML and does not pass through the microlens ML. This can prevent or reduce color mixing. While the present invention does not require the use of a microlens or a microlens layer, the microlens or the microlens layer is advantageous in preventing or reducing color mixing and is a recommended component.

[0028] The light-emitting element array LEDA includes a plurality of light-emitting elements LED. Each light-emitting element LED constitutes one subpixel and may have a subpixel electrode SPE. Here, a subpixel assigned with a color filter CFG that transmits green (G) light is a green (G) subpixel GSP. A subpixel assigned with a color filter CFR that transmits red (R) light is a red (R) subpixel GSR. A subpixel assigned with a color filter CFB that transmits blue (B) light is a blue (B) subpixel GSB. The periphery of each subpixel electrode SPE may be covered with a bank BNK having an opening OP. The opening OP may define the light-emitting region of each subpixel. The plurality of subpixel electrodes SPE and the bank BNK covering their peripheries may be covered with an organic film OF. A cathode electrode CE may be disposed on the organic film OF. The cathode electrode CE may be provided in common to the plurality of subpixel electrodes SPE or the plurality of subpixels. The cathode electrode CE may be understood as an upper electrode or a common electrode. A sealing film (protective film) SF may be disposed on the cathode electrode CE, and a color filter layer CFL may be disposed on the sealing film SF. A microlens layer MLL may be optionally disposed on the color filter layer CFL. Note that although the following embodiments include the cathode electrode CE, this may be omitted.

[0029] 6A shows a plan view of a color filter layer CFL of a display device of the second embodiment, and FIG. 6B shows a plan view of a microlens layer MLL of the display device of the second embodiment. Matters not mentioned in the second embodiment may conform to the first embodiment. The display device of the second embodiment may have, for example, a cross-sectional structure schematically shown in FIG. 3.

[0030] In the second embodiment, too, it is preferable that A / B<2·C / B be satisfied, more preferably that A / B<1.5·C / B be satisfied, and most preferably that A / B<1.2·C / B be satisfied. Alternatively, B and C may have values ​​less than ±5% of A. It is also preferable that TA / TB≦2·TC / TB be satisfied, more preferably that TA / TB<1.5·TC / TB be satisfied, and most preferably that TA / TB<1.2·TC / TB be satisfied. TB and TC may have values ​​less than ±5% of TA.

[0031] 6A and 6B, the ratio A:B:C of the areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the unit pixel area PU is 0.44:1.28:1.28. Therefore, A / B = 0.34 and C / B = 1. Also, in the example shown in FIG. 6, the ratio TA:TB:TC of the total areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the light-emitting element array LEDA is 0.44:1.28:1.28. Therefore, TA / TB = 0.34 and TC / TB = 1.

[0032] 6A and 6B, the area of ​​the blue (B) subpixel BSP can be made larger than that of the examples shown in FIGS. 1A to 1C. This is advantageous for reducing the current density of the blue (B) subpixel BSP, and can function to extend the lifetime of the blue subpixel BSP, which generally has a short lifetime.

[0033] 6A and 6B , the second embodiment includes a microlens array MLA including a plurality of microlenses ML, which are arranged such that one microlens ML is assigned to each of a plurality of first band-pass filters, a plurality of second band-pass filters, and a plurality of third band-pass filters.

[0034] The color filters constituting the color filter layer CFL may be classified into a first group consisting of a plurality of first band filters (CFG), a second group consisting of a plurality of second band filters (CFR), and a third group consisting of a plurality of third band filters (CFB). The microlenses ML may include a plurality of first microlenses ML1 and a plurality of second microlenses ML2. The first microlenses ML1 are microlenses ML assigned to each band filter (here, CFG) of one of the first, second, and third groups. The second microlenses ML2 are microlenses assigned to each band filter (here, CFR, CFB) of the remaining two groups of the first, second, and third loops. The bottom dimension of the first microlenses ML1 is smaller than the bottom dimension of the second microlenses ML2. The bottom dimension may be, for example, a diameter or a maximum width. In the example of FIG. 6B, if the bottom dimension of the first microlens ML1 is D1 and the bottom dimension of the second microlens ML2 is D2, then D1:D2=1:2.41.

[0035] The multiple first band filters (CFGs in the second embodiment) each have a square shape and are arranged spaced apart from one another in a square lattice pattern. The multiple second band filters (CFRs in the second embodiment) and the multiple third band filters (CFBs in the second embodiment) each have an octagonal shape composed of four pairs of parallel opposite sides. Two second band filters (CFRs) are in line contact with one pair of opposite sides of the square of the first band filter (CFG), and two third band filters (CFBs) are in line contact with another pair of opposite sides of the square of the first band filter (CFG). Two pairs of opposite sides of the four pairs of opposite sides of the second band filter (CFR) that do not contact the first band filter (CFG) are in line contact with two pairs of opposite sides of the four pairs of opposite sides of the third band filter (CFB) that do not contact the first band filter (CFG).

[0036] In this embodiment as well, in order to reduce color mixing, a light absorbing layer may be provided between each band-pass filter, and the band-pass filters may be configured to be in line contact with each other via the light absorbing layer.

[0037] The length of two pairs of opposing sides of the second band filter (CFR) that do not contact the first band filter (CFG) may be equal to or greater than the length of two pairs of opposing sides of the second band filter (CFR) that make line contact with the first band filter (CFG).The length of two pairs of opposing sides of the third band filter (CFB) that do not contact the first band filter (CFG) may be equal to or greater than the length of two pairs of opposing sides of the third band filter (CFB) that make line contact with the first band filter (CFG).

[0038] In the second embodiment, in an orthogonal projection or a plan view of the light-emitting element array LEDA, one first microlens ML1 is arranged to be in contact with four second microlenses ML2 that are arranged to be in contact with each other, and the radius of curvature of the lens surface of the first microlens ML1 is smaller than the radius of curvature of the lens surface of the second microlens ML2.

[0039] 7 shows a cross-sectional structure of a display device according to the third embodiment. The third embodiment is a modification of the first or second embodiment, and differs from the display devices according to the first and second embodiments in the configuration of the microlens layer MLL, but other configurations can follow the configuration of the display device according to the first or second embodiment.

[0040] The radius of curvature of the lens surface of the first microlens ML1 may be less than ±20%, less than ±10%, or less than ±5% of the radius of curvature of the second lens surface of the second microlens ML. Alternatively, the radius of curvature of the lens surface of the first microlens ML1 may be equal to the radius of curvature of the second lens surface of the second microlens ML.

[0041] 8A shows a plan view of a color filter layer CFL of a display device according to the fourth embodiment, and FIG. 8B shows a plan view of a microlens layer MLL of the display device according to the fourth embodiment. Matters not mentioned in the fourth embodiment may follow any of the first to third embodiments.

[0042] The multiple color filters constituting the color filter layer CFL of the fourth embodiment may have the same shape (and the same dimensions). In other words, the first band filter, the second band filter, and the third band filter may have the same shape (and the same dimensions). However, the color filters in contact with the boundary of the light-emitting element array may have different dimensions and shapes from the other color filters. The first band filter, the second band filter, and the third band filter may have a square shape. In another aspect, the first band filter, the second band filter, and the third band filter may have a rectangular or diamond shape.

[0043] In the fourth embodiment, the first band-pass filter is a band-pass filter CFB that transmits blue (B) light, the second band-pass filter is a band-pass filter CFG that transmits green (G) light, and the third band-pass filter is a band-pass filter CFR that transmits red (R) light, although these may be interchanged.

[0044] 8A and 8B, the ratio A:B:C of the areas occupied by the first band filter (CFB), the second band filter (CFG), and the third band filter (CFR) in the unit pixel area PU is 1.5:0.75:0.75. Therefore, A / B=2 and C / B=1. Also, in the example shown in Figures 8A and 8B, the ratio TA:TB:TC of the total areas occupied by the first band filter (CFB), the second band filter (CFG), and the third band filter (CFR) in the light-emitting element array LEDA is 1.5:0.75:0.75. Therefore, TA / TB=2 and TC / TB=1.

[0045] 8A and 8B, the area occupied by the first band-pass filter, i.e., the blue band-pass filter CFB, in the unit pixel region PU is larger than the area occupied by the second filter, i.e., the band-pass filter CFG that transmits green light, in the unit pixel region PU. In the example shown in Fig. 8, the area occupied by the first band-pass filter, i.e., the blue band-pass filter CFB, in the unit pixel region PU is larger than the area occupied by the third band-pass filter, i.e., the band-pass filter CFR that transmits red light, in the unit pixel region PU. This is advantageous for reducing the current density of the blue (B) sub-pixel BSP and may function to extend the lifetime of the blue sub-pixel BSP, which generally has a short lifetime.

[0046] In an orthogonal projection onto the light-emitting element array LEDA or in a plan view, the maximum value of the bottom dimension of the multiple microlenses ML is less than 1.2 times, 1.1 times, or 1.05 times the minimum value. Alternatively, in an orthogonal projection onto the light-emitting element array LEDA or in a plan view, the maximum value of the height of the multiple microlenses ML is less than 1.2 times, 1.1 times, or 1.05 times the minimum value. Alternatively, in an orthogonal projection onto the light-emitting element array LEDA or in a plan view, the maximum value of the radius of curvature of the multiple microlenses ML is less than 1.2 times, 1.1 times, or 1.05 times the minimum value. Alternatively, in an orthogonal projection onto the light-emitting element array LEDA or in a plan view, the multiple microlenses ML may have the same shape and the same dimensions. Here, the terms "same shape" and "same dimensions" are used to mean that manufacturing errors are allowed for.

[0047] The microlens layer MLL composed of a plurality of microlenses ML as described above is easy to manufacture and is advantageous in that it can provide uniform viewing angle characteristics.

[0048] Fig. 9A shows a plan view of a color filter layer CFL of a display device of the fifth embodiment, and Fig. 9B shows a plan view of a microlens layer MLL of the display device of the fifth embodiment. Matters not mentioned in the fifth embodiment may conform to any of the first to fourth embodiments. Fig. 10 shows an opening OP provided in a bank BNK of the display device of the fifth embodiment.

[0049] In the fifth embodiment, the first band-pass filter is a band-pass filter CFG that transmits green (G) light, the second band-pass filter is a band-pass filter CFR that transmits red (R) light, and the third band-pass filter is a band-pass filter CFB that transmits blue (B) light, although these may be interchanged.

[0050] The first band filter (CFG) has a hexagonal shape formed by three pairs of parallel opposite sides. The second band filter (CFR) has a shape formed by three hexagons formed by three pairs of parallel opposite sides, each joined together so that two adjacent sides are shared. The third band filter (CFB) has a shape formed by three hexagons formed by three pairs of parallel opposite sides, each joined together so that two adjacent sides are shared. These hexagons may or may not be regular hexagons.

[0051] 9A and 9B, the ratio A:B:C of the areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the unit pixel area PU is 1.2:0.8:1.2. Therefore, A / B=2 / 3 and C / B=1. Also, in the example shown in Figures 9A and 9B, the ratio TA:TB:TC of the total areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the light-emitting element array LEDA is 1.2:0.8:1.2. Therefore, TA / TB=2 / 3 and TC / TB=1.

[0052] 9A and 9B, the area of ​​the blue (B) subpixel BSP can be made the largest. Alternatively, in the example shown in Figures 9A and 9B, the area of ​​the blue (B) subpixel BSP can be made larger than that of the green (G) subpixel GSP. This is advantageous for reducing the current density of the blue (B) subpixel BSP, and can function to extend the lifetime of the blue subpixel BSP, which generally has a short lifetime.

[0053] The light-emitting elements LED may be arranged such that one light-emitting element LED corresponds to one color filter. A microlens array MLL including a plurality of microlenses ML may be arranged on the color filter layer CFL. The microlenses ML may be arranged such that one microlens ML is assigned to one of the above-mentioned hexagons. Each of the light-emitting elements LED may be provided with the same number of apertures as the number of microlenses ML assigned to the corresponding band-pass filter. Specifically, the light-emitting element LED of the green (G) sub-pixel GSP may be provided with one light-emitting element LED, one aperture O, and one microlens ML. The light-emitting element LED of the red (R) sub-pixel GSR may be provided with one light-emitting element LED, three apertures OP, and three microlenses. The light-emitting element LED of the blue (B) sub-pixel GSB may be provided with one light-emitting element LED, three apertures OP, and three microlenses.

[0054] The color filters constituting the color filter layer CFL can be classified into a first group consisting of a plurality of first band filters (CFG), a second group consisting of a plurality of second band filters (CFR), and a third group consisting of a plurality of third band filters (CFB). In one aspect, at least two microlenses are assigned to two of the first, second, and third groups, specifically, to each of the band filters (CFR, CFR) in the second and third groups. In another aspect, at least three microlenses are assigned to two of the first, second, and third groups, specifically, to each of the band filters (CFR, CFR) in the second and third groups.

[0055] 11 shows a plan view of the color filter layer CFL of a display device according to the sixth embodiment. In the sixth embodiment, the first band-pass filter is a band-pass filter CFG that transmits green (G) light, the second band-pass filter is a band-pass filter CFR that transmits red (R) light, and the third band-pass filter is a band-pass filter CFB that transmits blue (B) light. However, these may be interchanged.

[0056] The first band filter (CFG) has a hexagonal shape formed by three pairs of parallel opposite sides. The second band filter (CFR) has a shape formed by combining two hexagons formed by three pairs of parallel opposite sides. The third band filter (CFB) has a shape formed by combining four hexagons formed by three pairs of parallel opposite sides to form a cross shape. In other words, the centers of gravity of the four hexagons can be located on the vertices of an imaginary diamond.

[0057] In the example shown in Figure 11, the area ratio A:B:C that the first band filter (CFG), second band filter (CFR), and third band filter (CFB) occupy in the unit pixel area PU is 0.75:0.75:1.5. Therefore, A / B = 1 and C / B = 2. Also, in the example shown in Figure 11, the total area TA:TB:TC that the first band filter (CFG), second band filter (CFR), and third band filter (CFB) occupy in the light-emitting element array LEDA is 0.75:0.75:1.5. Therefore, TA / TB = 1 and TC / TB = 2.

[0058] 11, the area of ​​the blue (B) subpixel BSP can be made the largest. Alternatively, in the example shown in Fig. 11, the area of ​​the blue (B) subpixel BSP can be made larger than that of the green (G) subpixel GSP. This is advantageous for reducing the current density of the blue (B) subpixel BSP, and can function to extend the lifetime of the blue subpixel BSP, which generally has a short lifetime.

[0059] The light-emitting elements LED may be arranged such that one light-emitting element LED corresponds to one color filter. A microlens array MLL including a plurality of microlenses ML may be arranged on the color filter layer CFL. The microlenses ML may be arranged such that one microlens ML is assigned to one of the above-mentioned hexagons. Each of the light-emitting elements LED may be provided with the same number of apertures as the number of microlenses ML assigned to the corresponding band-pass filter. Specifically, the light-emitting element LED of the green (G) sub-pixel GSP may be provided with one light-emitting element LED, one aperture OP, and one microlens ML. The light-emitting element LED of the red (R) sub-pixel GSR may be provided with one light-emitting element LED, two apertures OP, and two microlenses. The light-emitting element LED of the blue (B) sub-pixel GSB may be provided with one light-emitting element LED, four apertures OP, and four microlenses.

[0060] The color filters constituting the color filter layer CFL can be classified into a first group consisting of a plurality of first band filters (CFG), a second group consisting of a plurality of second band filters (CFR), and a third group consisting of a plurality of third band filters (CFB). From one perspective, one microlens ML is assigned to one of the first, second, and third groups, specifically, to each band filter (CFG) in the first group. Furthermore, two microlenses ML are assigned to another of the first, second, and third groups, specifically, to each band filter (CFR) in the second group. Furthermore, four microlenses ML are assigned to yet another of the first, second, and third groups, specifically, to each band filter (CFB) in the third group.

[0061] 12A and 12B show plan views of a color filter layer CFL of a display device according to a seventh embodiment. In the seventh embodiment, the first band-pass filter is a band-pass filter CFG that transmits green (G) light, the second band-pass filter is a band-pass filter CFR that transmits red (R) light, and the third band-pass filter is a band-pass filter CFB that transmits blue (B) light. However, these may be interchanged.

[0062] The first band filter (CFG) has a hexagonal shape with three pairs of parallel opposite sides, the second band filter (CFR) has a shape formed by joining two hexagons with three pairs of parallel opposite sides, and the third band filter (CFB) has a shape formed by joining two hexagons with three pairs of parallel opposite sides.

[0063] The first band-pass filter (CFG) has a first side a, a second side b parallel to the first side a, a third side c connected to the second side b, a fourth side d connecting the third side c to the first side a, a fifth side e parallel to the fourth side d, and a sixth side f connecting the fifth side e to the first side a. The first side a is in line contact with one side of one second band-pass filter (CFR). The second side b and the third side c are in line contact with two sides of another second band-pass filter (CFR), respectively. The fourth side d is in line contact with one side of one third band-pass filter (CFB). The fifth and sixth sides are in line contact with two sides of another third band-pass filter (CFB).

[0064] In this embodiment as well, in order to reduce color mixing, a light absorbing layer may be provided between each band-pass filter, and the band-pass filters may be configured to be in line contact with each other via the light absorbing layer.

[0065] 12A and 12B, the ratio A:B:C of the areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the unit pixel area PU is 1:1:1. Therefore, A / B = C / B = 1. Also, in the example shown in Figures 12A and 12B, the ratio TA:TB:TC of the total areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the light-emitting element array LEDA is 1:1:1. Therefore, TA / TB = TC / TB = 1.

[0066] The light-emitting elements LED may be arranged such that one light-emitting element LED corresponds to one color filter. A microlens array MLL including a plurality of microlenses ML may be arranged on the color filter layer CFL. The microlenses ML may be arranged such that one microlens ML is assigned to one of the above-mentioned hexagons. Each of the light-emitting elements LED may be provided with the same number of apertures as the number of microlenses ML assigned to the corresponding band-pass filter. Specifically, the light-emitting element LED of the green (G) sub-pixel GSP may be provided with one light-emitting element LED, one aperture OP, and one microlens ML. The light-emitting element LED of the red (R) sub-pixel GSR may be provided with one light-emitting element LED, two apertures OP, and two microlenses. The light-emitting element LED of the blue (B) sub-pixel GSB may be provided with one light-emitting element LED, two apertures OP, and two microlenses.

[0067] The color filters constituting the color filter layer CFL can be classified into a first group consisting of a plurality of first band filters (CFG), a second group consisting of a plurality of second band filters (CFR), and a third group consisting of a plurality of third band filters (CFB). From one perspective, one microlens ML is assigned to one of the first, second, and third groups, specifically, to each band filter (CFG) in the first group. Furthermore, two microlenses ML are assigned to the other two of the first, second, and third groups, specifically, to each band filter (CFR) in the second group and each band filter (CFR) in the third group.

[0068] 13 shows a plan view of the color filter layer CFL of a display device according to the eighth embodiment. In the eighth embodiment, the first band-pass filter is a band-pass filter CFG that transmits green (G) light, the second band-pass filter is a band-pass filter CFR that transmits red (R) light, and the third band-pass filter is a band-pass filter CFB that transmits blue (B) light. However, these may be interchanged.

[0069] The first band filter (CFG) has a hexagonal shape with three pairs of parallel opposite sides, the second band filter (CFR) has a shape formed by joining two hexagons with three pairs of parallel opposite sides, and the third band filter (CFB) has a shape formed by joining two hexagons with three pairs of parallel opposite sides.

[0070] The first band-pass filter (CFG) has a first side a, a second side b connected to the first side a, a third side c parallel to the first side a, a fourth side d parallel to the second side b, a fifth side e connecting the second side b and the third side c, and a sixth side f connecting the first side a and the fourth side d. The fifth side e and the sixth side f are in line contact with one side of a different second band-pass filter (CFR). The first side a and the second side b are in line contact with two sides of one third band-pass filter (CFB), respectively. The third side c and the fourth side d are in line contact with two sides of another third band-pass filter (CFB).

[0071] In this embodiment as well, a light absorbing layer may be provided between each of the band-pass filters, so that the band-pass filters are in line contact with each other via the light absorbing layer.

[0072] In the example shown in Figure 13, the ratio A:B:C of the areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the unit pixel area PU is 1:1:1. Therefore, A / B = C / B = 1. Also, in the example shown in Figure 13, the ratio TA:TB:TC of the total areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the light-emitting element array LEDA is 1:1:1. Therefore, TA / TB = TC / TB = 1.

[0073] The light-emitting elements LED may be arranged such that one light-emitting element LED corresponds to one color filter. A microlens array MLL including a plurality of microlenses ML may be arranged on the color filter layer CFL. The microlenses ML may be arranged such that one microlens ML is assigned to one of the above-mentioned hexagons. Each of the light-emitting elements LED may be provided with the same number of apertures as the number of microlenses ML assigned to the corresponding band-pass filter. Specifically, the light-emitting element LED of the green (G) sub-pixel GSP may be provided with one light-emitting element LED, one aperture OP, and one microlens ML. The light-emitting element LED of the red (R) sub-pixel GSR may be provided with one light-emitting element LED, two apertures OP, and two microlenses. The light-emitting element LED of the blue (B) sub-pixel GSB may be provided with one light-emitting element LED, two apertures OP, and two microlenses.

[0074] The color filters constituting the color filter layer CFL can be classified into a first group consisting of a plurality of first band filters (CFG), a second group consisting of a plurality of second band filters (CFR), and a third group consisting of a plurality of third band filters (CFB). From one perspective, one microlens ML is assigned to one of the first, second, and third groups, specifically, to each band filter (CFG) in the first group. Furthermore, two microlenses ML are assigned to the other two of the first, second, and third groups, specifically, to each band filter (CFR) in the second group and each band filter (CFR) in the third group.

[0075] Fig. 14 shows a plan view of the color filter layer CFL of a display device according to a ninth embodiment. Fig. 15 shows a plan view of the color filter layer CFL of a display device according to a tenth embodiment. The ninth and tenth embodiments will be described together below. In the ninth and tenth embodiments, the first band-pass filter is a band-pass filter CFG that transmits green (G) light, the second band-pass filter is a band-pass filter CFR that transmits red (R) light, and the third band-pass filter is a band-pass filter CFB that transmits blue (B) light. However, these may be interchanged.

[0076] The first band-pass filter (CFG) has a hexagonal shape formed by three pairs of parallel opposite sides. The second band-pass filter (CFR) has a shape formed by combining a plurality of hexagons each formed by three pairs of parallel opposite sides so as to connect two opposite sides of the light-emitting element array LEDA. The third band-pass filter (CFB) has a shape formed by combining a plurality of hexagons each formed by three pairs of parallel opposite sides so as to connect the two opposite sides of the light-emitting element array LEDA.

[0077] 14 and 15, the ratio A:B:C of the areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the unit pixel area PU is 1:1:1. Therefore, A / B = C / B = 1. Also, in the examples shown in FIGS. 14 and 15, the ratio TA:TB:TC of the total areas occupied by the first band filter (CFG), the second band filter (CFR), and the third band filter (CFB) in the light-emitting element array LEDA is 1:1:1. Therefore, TA / TB = TC / TB = 1.

[0078] The plurality of light-emitting elements LED may be arranged such that one light-emitting element LED corresponds to one color filter. A microlens array MLL including a plurality of microlenses ML may be arranged on the color filter layer CFL. The plurality of microlenses ML may be arranged such that one microlens ML is assigned to one of the above-mentioned hexagons. Each of the plurality of light-emitting elements LED may be provided with the same number of openings as the number of microlenses ML assigned to the corresponding band-pass filter.

[0079] The following describes additional techniques that can be applied to the above-described first to tenth embodiments. Fig. 16 schematically shows the cross-sectional structures of sub-pixels GSP, RS, and BSP, each of which has a green (G) color filter CFG, a red (R) color filter CFR, and a blue (B) color filter CFB.

[0080] The subpixel electrodes SPE of the subpixels GSP, RS, and BSP may be disposed on a reflective film RF via an insulating film IF. The reflective film RF may have a thickness corresponding to the color assigned to the subpixels GSP, RS, and BSP to which it is provided. This allows light having a wavelength corresponding to the color assigned to the subpixels GSP, RS, and BSP, with the color bands assigned to the subpixels GSP, RS, and BSP enhanced, to be emitted toward the color filter layer CFF. The reflective film RF, insulating film IF, subpixel electrodes SPE, and banks BNK may be formed using lithography, which is advantageous for forming fine structures. The color filter layer CFL and microlens layer MLL may also be formed using lithography.

[0081] The thickness of the insulating film IF in each of the subpixels GSP, RS, and BSP is described below in order to optimize the distance (optical distance) between the reflective film RF and the light-emitting layer of the organic film OF for the bands transmitted by the color filters CFG, CFR, and CFB, respectively. When the optical path length from the upper surface of the reflective film RF to the light-emitting layer of the organic film OF is Lr and the phase shift at the reflective film RF is Φr, the following equation (1) is established.

[0082] Lr={2m-(Φr / π)}×(λ / 4) (1), where m is an integer (non-negative integer) greater than or equal to 0. The thickness of the insulating film IF in each of the sub-pixels GSP, RS, and BSP can be determined so as to approximately satisfy equation (1).

[0083] In addition, the optical distance Ls between the light-emitting layer of the organic film OF and the lower surface of the cathode electrode CE approximately satisfies equation (2), where Φs is the phase shift that occurs when light of wavelength λ is reflected by the lower surface of the cathode electrode CE. In this configuration, m′=0.

[0084] Ls = {2m' - (Φs / π)} × (λ / 4) = -(Φs / π) × (λ / 4) ... (2) Therefore, the total layer interference L roughly satisfies equation (3): L = Lr + L = (2m - Φ / π) × (λ / 4) ... (3) Here, Φ is the sum of the phase shifts Φr + Φs when light of wavelength λ is reflected by the reflective film RF and the cathode electrode CE.

[0085] The subpixel electrode SPE may be made of a transparent conductive film that transmits visible light, such as ITO, IZO, aluminum zinc oxide (AZO), or indium gallium zinc oxide (IGZO). A bank BNK may be provided to cover the outer periphery of the subpixel electrode SPE. The bank BNK may be made of an inorganic insulating material such as SiN, SiON, or SiO, or an organic insulating material such as an acrylic resin or a polyimide resin.

[0086] The organic film OF is disposed to cover the subpixel electrode SPE. The organic film OF can be formed by known techniques such as vapor deposition or spin coating. The organic film OF can be composed of multiple layers including an emissive layer. Examples of the multiple layers include a hole injection layer, a hole transport layer, an electron blocking layer, an emissive layer, a hole blocking layer, an electron transport layer, and an electron injection layer. The organic film OF emits light when holes injected from the anode (subpixel electrode SPE) and electrons injected from the cathode (cathode electrode CE) recombine in the emissive layer. The emissive layer can be a single layer or multiple layers. The emissive layer can contain a red emissive material, a green emissive material, and a red emissive material. White light can be obtained by mixing these emissive colors. The emissive layer can also contain emissive materials of complementary colors, such as a blue emissive material and a yellow emissive material.

[0087] The cathode electrode CE is disposed on the organic film OF and has light-transmitting properties. The cathode electrode CE may be composed of a semi-transparent material that transmits part of the light that reaches its lower surface and reflects the other part (i.e., semi-transparent / reflective). The cathode electrode CE may be composed of a transparent material such as a transparent conductive oxide. The cathode electrode CE may be composed of an elemental metal such as Al, Ag, or Au, or an alkali metal such as lithium (Li) or cesium (Cs). The cathode electrode CE may be composed of an alkaline earth metal such as magnesium (Mg), calcium (Ca), or barium (Ba). The cathode electrode CE may be composed of a semi-transparent material such as an alloy material containing these metal materials. The cathode electrode CE may have a stacked structure of the above materials.

[0088] The sealing film SF can be formed so as to cover the organic film OF including the light-emitting layer. The sealing film OF may contain an inorganic material that is translucent and has low permeability to oxygen and moisture from the outside. The sealing film SF may be made of, for example, SiN, SiON, SiO, aluminum oxide (Al ２ O ３ ), titanium oxide (TiO ２ The sealing film SF can be formed by, for example, a CVD method, an atomic layer deposition method (ALD method), a sputtering method, or the like. As long as the sealing film SF has sufficient moisture blocking performance, it may have a single-layer structure or a laminated structure that combines the above-mentioned materials and forming methods.

[0089] A planarization film may be disposed on the sealing film SF. The planarization film may be formed of a light-transmitting material. The planarization film may be composed of an inorganic material or an organic material. A color filter layer CFL may be disposed on the sealing film SF or the planarization layer.

[0090] 17 exemplarily shows a plug PL. The plug PL can be provided to maintain the cathode electrode CE at a fixed potential. The plug PL can be arranged, for example, to connect the cathode electrode CE to a ground line. The plug PL can be arranged, for example, between the microlenses ML in an orthogonal projection or plan view of the light-emitting element array LEDA.

[0091] 18 exemplarily illustrates a leakage reduction structure LP. The leakage reduction structure LP can be arranged to reduce leakage current between subpixels. The leakage reduction portion LP can be arranged, for example, to make the organic film OF between subpixels thinner than the organic film OF in the subpixels. The leakage reduction portion LP can include, for example, a convex portion or a concave portion. The leakage reduction portion LP can be arranged, for example, between the microlenses ML in an orthogonal projection or a plan view of the light-emitting element array LEDA.

[0092] Hereinafter, application examples of the above-described display device will be described.

[0093] 19 illustrates an exemplary configuration of an imaging device 1100 incorporating a display device typified by the above-described embodiments. The imaging device 1100 may include a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The imaging device may be called a camera. Alternatively, the imaging device may be incorporated into an electronic device such as a computer. A display device typified by the above-described embodiments may be applied to the viewfinder 1101, which is a display unit. The viewfinder 1101 may display not only an image captured by an imaging element, but also environmental information, imaging instructions, and the like. The environmental information may include the intensity of external light, the direction of external light, the speed at which the subject is moving, the possibility that the subject will be blocked by an obstruction, and the like.

[0094] The imaging device 1100 has an optical section (not shown). The optical section has multiple lenses, and forms an image on an image sensor (not shown) housed in a housing 1104 that receives light that has passed through the optical section. The focus of the multiple lenses can be adjusted by adjusting their relative positions. This operation can also be performed automatically.

[0095] The display device typified by the above-described embodiments may be applied to a display unit of an electronic device. In this case, the display unit may have both a display function and an operation function. Examples of the portable terminal include a mobile phone such as a smartphone, a tablet, and a head-mounted display.

[0096] FIG. 20 is a schematic diagram showing an example of an electronic device incorporating a display device typified by the above-described embodiments. The electronic device 1200 has a display unit 1201, an operation unit 1202, and a housing 1203. The housing 1203 may have a circuit, a printed circuit board having the circuit, a battery, and a communication unit. The operation unit 1202 may be a button or a touch panel type reaction unit. The operation unit 1202 may be a biometric recognition unit that recognizes a fingerprint to perform operations such as unlocking. A portable device having a communication unit can also be called a communication device. A display device typified by the above-described embodiments can be applied to the display unit 1201.

[0097] 21A and 21B show application examples of display devices typified by the above-described embodiments. FIG. 21A shows a display device such as a television monitor or a PC monitor. The display device 1300 has a frame 1301 and a display unit 1302. The display unit 1302 can be a display device typified by the above-described embodiments. The display device 1300 may have a base 1303 that supports the frame 1301 and the display unit 1302. The base 1303 is not limited to the form shown in FIG. 21A . For example, the bottom edge of the frame 1301 may also serve as the base 1303. The frame 1301 and the display unit 1302 may also be curved. The radius of curvature may be 5000 mm or more and 6000 mm or less.

[0098] FIG. 21B shows another application example of a display device typified by the above-described embodiments. The display device 1310 in FIG. 21B is configured to be foldable, and is a so-called foldable display device. The display device 1310 has a first display unit 1311, a second display unit 1312, a housing 1313, and a bending point 1314. The first display unit 1311 and the second display unit 1312 can be a single display unit without any joints. The first display unit 1311 and the second display unit 1312 can be separated by the bending point. The first display unit 1311 and the second display unit 1312 may display different images, or the first display unit and the second display unit may display a single image.

[0099] 22A and 22B show another example of an electronic device incorporating a display device typified by the above-described embodiments. The display device typified by the above-described embodiments can be applied to wearable devices such as smart glasses, HMDs, and smart contact lenses. The image capturing and display device used in such an application example includes an image capturing device capable of photoelectrically converting visible light and a display device capable of emitting visible light.

[0100] 22A illustrates glasses 1600 (smart glasses) according to one application example. An imaging device 1602 such as a CMOS sensor or a SPAD is provided on the front side of a lens 1601 of the glasses 1600. In addition, a display device according to any of the above-described embodiments is provided on the back side of the lens 1601.

[0101] The glasses 1600 further include a control device 1603. The control device 1603 functions as a power source that supplies power to the image capture device 1602 and the display device according to each embodiment. The control device 1603 also controls the operations of the image capture device 1602 and the display device. The lens 1601 is formed with an optical system for focusing light onto the image capture device 1602.

[0102] FIG. 22B illustrates glasses 1610 (smart glasses) according to one application example. The glasses 1610 include a control device 1612, which is equipped with an imaging device corresponding to the imaging device 1602 and a display device. A lens 1611 includes an optical system for projecting light emitted from the imaging device and the display device within the control device 1612, and an image is projected onto the lens 1611. The control device 1612 functions as a power source for supplying power to the imaging device and the display device, and controls the operation of the imaging device and the display device. The control device may also include a gaze detection unit for detecting the wearer's gaze. Infrared light may be used for gaze detection. The infrared light emitter emits infrared light toward the eyeball of a user gazing at a displayed image. An imaging unit with a light-receiving element detects the reflected light of the emitted infrared light from the eyeball, thereby obtaining an image of the eyeball. A reduction unit for reducing light from the infrared light emitter to the display unit in a planar view reduces degradation of image quality.

[0103] The gaze of the user relative to the displayed image is detected from an image of the eyeball obtained by capturing infrared light. Any known method can be used for gaze detection using an image of the eyeball. One example is a gaze detection method based on the Purkinje image formed by reflection of irradiated light on the cornea.

[0104] More specifically, gaze detection processing is performed based on the pupil-corneal reflex method, which calculates a gaze vector representing the direction (rotation angle) of the eyeball based on the pupil image and Purkinje image included in the captured image of the eyeball, thereby detecting the user's gaze.

[0105] A display device according to an embodiment of the present invention may have an imaging device having a light receiving element, and may control the image displayed on the display device based on information about the user's line of sight from the imaging device.

[0106] Specifically, the display device determines a first field of view area where the user gazes and a second field of view area other than the first field of view area based on the line-of-sight information. The first field of view area and the second field of view area may be determined by a control device of the display device, or may be determined by an external control device and received. In the display area of ​​the display device, the display resolution of the first field of view area may be controlled to be higher than the display resolution of the second field of view area. In other words, the resolution of the second field of view area may be lower than that of the first field of view area.

[0107] The display area includes a first display area and a second display area different from the first display area, and a high-priority area is determined from the first display area and the second display area based on line-of-sight information. The first field of view area and the second field of view area may be determined by a control device of the display device, or may be determined by an external control device and received. The resolution of the high-priority area may be controlled to be higher than the resolution of areas other than the high-priority area. In other words, the resolution of an area with a relatively low priority may be lowered.

[0108] Note that AI may be used to determine the first field of view area and the area with high priority. The AI ​​may be a model configured to estimate the angle of gaze and the distance to an object in the line of sight from the image of the eyeball, using as training data an image of the eyeball and the direction in which the eyeball in the image was actually looking. The AI ​​program may be included in the display device, the imaging device, or an external device. If included in the external device, it is transmitted to the display device via communication.

[0109] When display control is performed based on visual recognition detection, the smart glasses can be preferably applied to smart glasses that further include an imaging device for capturing images of the outside world. The smart glasses can display captured external information in real time.

[0110] As described above, by using a device using the organic light-emitting element according to this embodiment, it is possible to provide a stable display with good image quality even over a long period of time.

[0111] The invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention. Accordingly, the following claims are appended to apprise the public of the scope of the invention.

[0112] This application claims priority based on Japanese Patent Application No. 2021-119008, filed on July 19, 2021, the entire contents of which are incorporated herein by reference.

[0113] LEDA: Light emitting element array, CFL: Color filter layer, MLL: Microlens layer

Claims

1. A light-emitting element array including a plurality of light-emitting elements disposed on a substrate, A color filter layer including a plurality of first-band filters disposed on the light-emitting element array and transmitting light of a first band, a plurality of second-band filters transmitting light of a second band different from the first band, and a plurality of third-band filters transmitting light of a third band different from the first band and the second band, the display device comprising: The color filter layer has at least a first row in which the first-band filters are arranged, a second row in which the second-band filters and the third-band filters are alternately arranged, and a third row in which the second-band filters and the third-band filters are alternately arranged in an order different from that of the second row. At least one of the first-band filters is in contact with at least one of the second-band filters and at least one of the third-band filters. The first-band filter has a hexagonal shape composed of three pairs of parallel opposite sides. The second-band filter has a shape in which a plurality of hexagons each composed of three pairs of parallel opposite sides are combined so as to connect two opposite sides of the light-emitting element array. The third-band filter has a shape in which a plurality of hexagons each composed of three pairs of parallel opposite sides are combined so as to connect the two opposite sides of the light-emitting element array. A display device characterized by the above.

2. A light-emitting element array including a plurality of light-emitting elements disposed on a substrate, A color filter layer including a plurality of first-band filters disposed on the light-emitting element array and transmitting light of a first band, a plurality of second-band filters transmitting light of a second band different from the first band, and a plurality of third-band filters transmitting light of a third band different from the first band and the second band, the display device comprising: The color filter layer has an arrangement in which the first band filters are arranged according to a delta array, and the number of the second band filters and the number of the third band filters are less than the number of the first band filters. The display device is characterized in that at least one of the first band filters is in contact with at least one of the second band filters and at least one of the third band filters.

3. The display device further includes a microlens array including a plurality of microlenses disposed on the color filter layer. The display device according to claim 1 or 2, characterized in that.

4. The display device further includes a microlens array including a plurality of microlenses disposed on the color filter layer. The plurality of microlenses include first microlenses assigned to each band filter of one group among a first group composed of the plurality of first band filters, a second group composed of the plurality of second band filters, and a third group composed of the plurality of third band filters, and second microlenses assigned to each band filter of the remaining two groups among the first group, the second group, and the third group. The bottom surface dimension of the first microlens is smaller than the bottom surface dimension of the second microlens. The display device according to claim 1 or 2, characterized in that.

5. The radius of curvature of the lens surface of the first microlens is smaller than the radius of curvature of the lens surface of the second microlens. The display device according to claim 4, characterized in that.

6. The display device further includes a microlens array including a plurality of microlenses disposed on the color filter layer. One of the groups among the first group consisting of the plurality of first band filters, the second group consisting of the plurality of second band filters, and the third group consisting of the plurality of third band filters is assigned one of the plurality of microlenses to each band filter, and two of the plurality of microlenses are assigned to each band filter of another one of the first group, the second group, and the third group, and four of the plurality of microlenses are assigned to each band filter of still another one of the first group, the second group, and the third group. The display device according to claim 1 or 2, characterized in that.

7. Further comprising a microlens array including a plurality of microlenses disposed on the color filter layer. One of the groups among the first group consisting of the plurality of first band filters, the second group consisting of the plurality of second band filters, and the third group consisting of the plurality of third band filters is assigned one of the plurality of microlenses to each band filter, and two of the plurality of microlenses are assigned to each band filter of the other two groups among the first group, the second group, and the third group. The display device according to claim 1 or 2, characterized in that.

8. Further comprising a microlens array including a plurality of microlenses disposed on the color filter layer. One of the groups among the first group consisting of the plurality of first band filters, the second group consisting of the plurality of second band filters, and the third group consisting of the plurality of third band filters is assigned one of the plurality of microlenses to each band filter, and 10 or more of the plurality of microlenses are assigned to each band filter of the other two groups among the first group, the second group, and the third group. The display device according to claim 1 or 2, characterized in that...

9. The second band filter has a shape formed by joining three hexagons each composed of three pairs of parallel opposite sides so as to share two adjacent sides of each, The third band filter has a shape formed by joining three hexagons each composed of three pairs of parallel opposite sides so as to share two adjacent sides of each, The display device according to claim 1 or 2, characterized in that...

10. The second band filter has a shape formed by joining two hexagons each composed of three pairs of parallel opposite sides, The third band filter has a shape formed by joining four hexagons each composed of three pairs of parallel opposite sides so as to form a cross shape, The display device according to claim 1 or 2, characterized in that...

11. The second band filter has a shape formed by joining two hexagons each composed of three pairs of parallel opposite sides, The third band filter has a shape formed by joining two hexagons each composed of three pairs of parallel opposite sides, The display device according to claim 1 or 2, characterized in that...

12. The first band filter has a first side, a second side parallel to the first side, a third side connected to the second side, a fourth side connecting the third side and the first side, a fifth side parallel to the fourth side, and a sixth side connecting the fifth side and the first side, The first side is in line contact with one side of one of the second band filters, the second side and the third side are in line contact with two sides of another one of the second band filters respectively, the fourth side is in line contact with one side of one of the third band filters, and the fifth side and the sixth side are in line contact with two sides of another one of the third band filters, The display device according to claim 11, characterized in that...

13. The first band filter has a first side, a second side connected to the first side, a third side parallel to the first side, a fourth side parallel to the second side, a fifth side connecting the second side and the third side, and a sixth side connecting the first side and the fourth side. The fifth side and the sixth side are in line contact with one side of the second band filters that are different from each other, the first side and the second side are in line contact with two sides of one of the third band filters respectively, and the third side and the fourth side are in line contact with two sides of another one of the third band filters. The display device according to claim 11, characterized in that.

14. The plurality of light-emitting elements are arranged such that one light-emitting element corresponds to one color filter. The display device according to claim 1 or 2, characterized in that.

15. The display device further comprises a microlens array including a plurality of microlenses disposed on the color filter layer. The plurality of microlenses are arranged such that one microlens is assigned to one hexagon. The display device according to claim 1 or 2, characterized in that.

16. Each of the plurality of light-emitting elements is provided with the same number of apertures as the number of microlenses assigned to the corresponding band filter. The display device according to claim 15, characterized in that.

17. An imaging device having an optical unit having a plurality of lenses, an imaging element that receives light that has passed through the optical unit, and a display unit that displays an image. The display unit is a display unit that displays an image captured by the imaging element, and the imaging device is characterized by having the display device according to claim 1 or 2.

18. The imaging device has a housing provided with a display unit and a communication unit provided in the housing for communicating with the outside. The electronic device is characterized in that the display unit has the display device according to claim 1 or 2.