CN113451351A - Micro light emitting display device - Google Patents
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- CN113451351A CN113451351A CN202110830698.XA CN202110830698A CN113451351A CN 113451351 A CN113451351 A CN 113451351A CN 202110830698 A CN202110830698 A CN 202110830698A CN 113451351 A CN113451351 A CN 113451351A
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
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- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
- H01L33/46—Reflective coating, e.g. dielectric Bragg reflector
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Abstract
The present invention provides a micro light emitting display device having a plurality of display regions. The micro light-emitting display device comprises a substrate, a plurality of micro light-emitting elements and a plurality of first light-emitting auxiliary structures. The micro light-emitting elements are arranged on the substrate, and the positions of the micro light-emitting elements define the range of the display areas, wherein the micro light-emitting elements have the same first pitch in any display area. The micro light-emitting elements have a second pitch between boundaries spanning any two adjacent display regions. The first pitch is different from the second pitch. The first light-emitting auxiliary structures are respectively arranged on the micro light-emitting elements. The first light extraction auxiliary structures have the same third pitch with each other.
Description
Technical Field
The present invention relates to a micro light emitting display device.
Background
The display device formed by Micro Light Emitting diodes (Micro LEDs) cannot be manufactured in a large area in one step in a display area, and the display device is spliced by performing large-scale transfer in a small-area and multi-transfer manner. However, the multiple transfer mode also causes a splicing line phenomenon easily occurring after the display device is lighted, and the phenomenon may come from chip offset or brightness difference between different display areas to cause group offset, thereby easily generating a splicing line.
Disclosure of Invention
The present invention is directed to a micro light emitting display device that can reduce a splicing line phenomenon.
An embodiment of the present invention provides a micro light emitting display device having a plurality of display regions. The micro light-emitting display device comprises a substrate, a plurality of micro light-emitting elements and a plurality of first light-emitting auxiliary structures. The micro light-emitting elements are arranged on the substrate, and the positions of the micro light-emitting elements define the range of the display areas, wherein the micro light-emitting elements have the same first pitch in any display area. The micro light-emitting elements have a second pitch between boundaries spanning any two adjacent display regions. The first pitch is different from the second pitch. The first light-emitting auxiliary structures are respectively arranged on the micro light-emitting elements. The first light extraction auxiliary structures have the same third pitch with each other.
In an embodiment of the invention, the first pitch is the same as the third pitch.
In an embodiment of the invention, the first light-emitting auxiliary structures have a plurality of different areas.
In an embodiment of the invention, the micro light emitting devices have a plurality of different light emitting areas, and the light emitting auxiliary structures have the same area.
In an embodiment of the invention, the first light-exiting auxiliary structures are light-guiding structures, and a refractive index of the first light-exiting auxiliary structures is greater than 1 and smaller than a refractive index of the micro light-emitting elements.
In an embodiment of the invention, in any two adjacent display regions, the minimum distances between the edges of the first light-emitting auxiliary structures and the edges of the micro light-emitting elements are different from each other.
In an embodiment of the invention, the first light-emitting auxiliary structures are reflective layers or absorption layers, and each of the first light-emitting auxiliary structures has a light-emitting opening.
In an embodiment of the invention, the light-emitting openings of the first light-emitting auxiliary structures have the same third pitch.
In an embodiment of the invention, the projection of the micro light emitting devices on the substrate completely covers the projection of the light exit openings of the first light exit auxiliary structures on the substrate.
In an embodiment of the invention, in any two adjacent display regions, the minimum thicknesses between the edges of the first light-exiting auxiliary structures and the light-exiting openings thereof are different from each other.
In an embodiment of the invention, the micro light-emitting display device further includes a plurality of second light-emitting auxiliary structures. The second light-emitting auxiliary structures are respectively arranged in the light-emitting openings of the first light-emitting auxiliary structures. The second light-emitting auxiliary structures have the same fourth pitch, and the fourth pitch is the same as the third pitch.
In an embodiment of the invention, the second light-exiting auxiliary structures are light-guiding structures, and a refractive index of the second light-exiting auxiliary structures is greater than 1 and smaller than a refractive index of the micro light-emitting elements.
In an embodiment of the invention, a portion of the second light-emitting auxiliary structures extends and is disposed on a surface of the first light-emitting auxiliary structures opposite to the micro light-emitting elements.
In an embodiment of the invention, the first light-emitting auxiliary structures are connected to each other, and the first light-emitting auxiliary structures are disposed in a space between the micro light-emitting elements.
In an embodiment of the invention, the micro light emitting display device further includes a light transmissive layer. The light-transmitting layer is arranged between the first light-emitting auxiliary structures and the micro light-emitting elements, and the light-transmitting layer is arranged in the space between the micro light-emitting elements.
An embodiment of the present invention provides a micro light emitting display device having a plurality of display regions. The micro light-emitting display device comprises a substrate, a plurality of micro light-emitting elements and a plurality of light-emitting auxiliary structures. The micro light-emitting elements are arranged on the substrate, the positions of the micro light-emitting elements define the range of the display areas, wherein the micro light-emitting elements have the same first pitch in any display area, and the micro light-emitting elements have the second pitch between the boundaries crossing any two adjacent display areas. The first pitch is different from the second pitch. The light-emitting auxiliary structures are respectively arranged on the micro light-emitting elements. The light-emitting auxiliary structures are reflecting layers or absorbing layers and are respectively provided with light-emitting openings. The area of the light-emitting opening of the light-emitting auxiliary structures is gradually increased or gradually decreased at the boundary crossing any two adjacent display areas.
In an embodiment of the invention, an area ratio between the light-emitting openings of the light-emitting auxiliary structures is in a range of 0.8 to 1.2.
Based on the above, in the micro light-emitting display device according to an embodiment of the present invention, since the light-emitting auxiliary structures have the same pitch, the effective light-emitting area is redefined, and thus the phenomenon that the splicing line exists between the display regions is reduced.
Drawings
Fig. 1A is a schematic top view of a micro light emitting display device according to a first embodiment of the present invention;
FIG. 1B is a schematic side view of the micro light-emitting display device of FIG. 1A;
FIG. 2 is a schematic side view of a micro light-emitting display device according to a second embodiment of the present invention;
fig. 3A is a schematic top view of a micro light emitting display device according to a third embodiment of the present invention;
FIG. 3B is a schematic side view of a micro light-emitting display device according to a third embodiment of the present invention;
fig. 4A is a schematic top view of a micro light emitting display device according to a fourth embodiment of the present invention;
FIG. 4B is a schematic side view of the micro light-emitting display device of FIG. 4A;
FIG. 5 is a schematic side view of a micro light-emitting display device according to a fifth embodiment of the present invention;
FIG. 6 is a schematic side view of a micro light-emitting display device according to a sixth embodiment of the present invention;
fig. 7A is a schematic top view of a micro light emitting display device according to a seventh embodiment of the present invention;
FIG. 7B is a schematic side view of the micro light-emitting display device of FIG. 7A;
fig. 8A is a schematic top view of a micro light emitting display device according to an eighth embodiment of the present invention;
FIG. 8B is a schematic side view of the micro light-emitting display device of FIG. 8A;
fig. 9 is a schematic side view of a micro light emitting display device according to a ninth embodiment of the present invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1A is a schematic top view of a micro light emitting display device according to a first embodiment of the present invention. Fig. 1B is a schematic side view of the micro light emitting display device of fig. 1A. For convenience of explanation, each drawing in the specification simply illustrates only two display regions R1, R2, but the number of display regions R1, R2 that the micro-light emitting display device 10 can have should be determined depending on actual production conditions. Furthermore, the number of micro-light emitting devices 200 in each of the display regions R1 and R2The simple illustration is 3 × 3. For example, the area of each of the display regions R1 and R2 is about 20 × 20 to 30 × 30mm2. Therefore, the number of micro light emitting elements 200 in the display regions R1, R2 is larger than 103。
Referring to fig. 1A and fig. 1B together, an embodiment of the invention provides a micro light emitting display device 10 having a plurality of display regions R1 and R2. The micro light emitting display device 10 includes a substrate 100, a plurality of micro light emitting elements 200, and a plurality of first light extraction assisting structures 300. The substrate 100 is, for example, a Thin-Film Transistor (TFT) substrate, a Printed Circuit Board (PCB), a Flexible Printed Circuit (FPC) substrate, or other types of Circuit substrates. The Micro Light Emitting element 200 may be a Micro Light Emitting Diode (Micro LED), a sub-millimeter Light Emitting Diode (Mini LED), or other types of Micro Light Emitting elements. The micro light emitting device 200 is electrically connected to the substrate 100 through the connection between the bonding pad 202 of the micro light emitting device 200 and the bonding pad 102 of the substrate 100.
In the present embodiment, the micro light emitting devices 200 are disposed on the substrate 100, and the positions of the micro light emitting devices 200 define the ranges of the display regions R1 and R2. In detail, the micro light emitting elements 200 have the same first Pitch (Pitch) P1 within any one of the display regions R1, R2 with respect to each other. However, the micro light emitting elements 200 have the second pitch P2 between the boundaries across any two adjacent display regions R1, R2. The first pitch P1 is different from the second pitch P2. Therefore, the distribution of the micro light-emitting elements 200 may visually have a phenomenon of a splice line at the boundary between the display regions R1, R2.
In order to solve the above splicing line phenomenon, in this embodiment, the first light-emitting auxiliary structures 300 are respectively disposed on the micro light-emitting elements 200. The first light exit assisting structures 300 have the same third pitch P3 between each other. Wherein the first light exit assisting structure 300 is configured such that the first pitch P1 is the same as the third pitch P3. That is, as shown in the top view of fig. 1A, the first light-exiting auxiliary structures 300 have the same pitch, so that the phenomenon that the splicing line exists at the boundary between the display regions R1 and R2 is alleviated.
In the present embodiment, the third pitch P3 is 1 μm or less. In one embodiment, the third pitch P3 is less than or equal to 500 μm, which can provide better display effect.
In this embodiment, the first light-emitting auxiliary structure 300 may be a light-guiding structure, and the refractive index of the first light-emitting auxiliary structure 300 is greater than 1 and smaller than the refractive index of the micro light-emitting device 200. The refractive index difference helps to improve the light extraction efficiency of each micro light-emitting device 200. The light guide structure may be an inorganic material, such as silicon dioxide or silicon nitride, which not only can increase the light guide effect, but also can protect the surface of the micro light emitting device 200 against high temperature and high pressure during the manufacturing process. The ratio of the first light-emitting auxiliary structure 300 to the surface 204 of the micro light-emitting device 200 is at least greater than or equal to 0.5, which can provide better light-guiding efficiency.
In addition, in the present embodiment, in any two adjacent display regions R1, R2, the minimum distances d1, d2 between the edge of the first light-exiting auxiliary structure 300 and the edge of the micro light-emitting element 200 are different from each other, and the light-exiting light pattern can be controlled.
Based on the above, in the micro light emitting display device 10 according to an embodiment of the invention, since the light-emitting auxiliary structures 300 are disposed on the micro light emitting elements 200 and the light-emitting auxiliary structures 300 have the same pitch, the light-emitting effective area is redefined, and thus the phenomenon that the splicing line exists between the display regions R1 and R2 is reduced.
Fig. 2 is a schematic side view of a micro light emitting display device according to a second embodiment of the present invention. Referring to fig. 2, the micro light-emitting display device 10A is substantially the same as the micro light-emitting display device 10 of fig. 1B, and the main differences are as follows. In the present embodiment, the first light extraction auxiliary structures 300A-1, 300A-2, 300A-3 have a plurality of different areas. FIG. 2 shows that the area of the light-exiting auxiliary structure 300A-1 is larger than the areas of the light-exiting auxiliary structures 300A-2 and 300A-3, and the area of the light-exiting auxiliary structure 300A-2 is equal to the area of the light-exiting auxiliary structure 300A-3. For example, the light-emitting auxiliary structures 300A-1, 300A-2 and 300A-3 are respectively disposed on the red, green and blue micro light-emitting devices 200. Generally, the light emitting efficiency of the red light emitting diode is lower than that of the green and blue light emitting diodes. Therefore, the first light-emitting auxiliary structures 300A-1, 300A-2, 300A-3 are designed to have a plurality of different areas, for example, the light-emitting auxiliary structure 300A-1 corresponding to the red micro light-emitting device 200 is larger than the first light-emitting auxiliary structures 300A-2, 300A-3 corresponding to the green and blue micro light-emitting devices 200, which helps to make the brightness of each color of the micro light-emitting display device 10A more uniform.
Fig. 3A is a schematic top view of a micro light emitting display device according to a third embodiment of the present invention. Fig. 3B is a schematic side view of a micro light emitting display device according to a third embodiment of the present invention. Referring to fig. 3A and 3B, a micro light emitting display device 10B is substantially the same as the micro light emitting display device 10 of fig. 1B, and the main differences are as follows. In the present embodiment, the micro light emitting devices 200B-1, 200B-2, and 200B-3 have a plurality of different light emitting areas, but the light-emitting auxiliary structures 300 have the same area. FIG. 3B illustrates that the size of the micro light-emitting element 200B-1 is larger than the size of the micro light-emitting elements 200B-2, 200B-3, and the size of the micro light-emitting element 200B-2 is equal to the size of the micro light-emitting element 200B-3. For example, the micro light emitting devices 200B-1, 200B-2, and 200B-3 can be red, green, and blue light emitting diodes, respectively, or light emitting diodes of the same color, and the size of the micro light emitting devices is different due to the process, and the size of the micro light emitting devices reflects the area size of the light emitting layers 206-1, 206-2, and 206-3. Therefore, the light-emitting auxiliary structures 300 on the micro light-emitting elements 200B-1, 200B-2, and 200B-3 with different light-emitting areas are designed to have the same area, which helps to make the brightness of each color light of the micro light-emitting display device 10B more uniform, and can increase the chip utilization without performing a previous sorting level (i.e., Bin) of the light-emitting elements.
Fig. 4A is a schematic top view of a micro light emitting display device according to a fourth embodiment of the present invention. Fig. 4B is a schematic side view of the micro light emitting display device of fig. 4A. Referring to fig. 4A and 4B, the micro light-emitting display device 10C is substantially the same as the micro light-emitting display device 10 of fig. 1B, and the main differences are as follows. In the present embodiment, the first light-emitting auxiliary structure 300C is a reflective layer or an absorption layer, and each has a light-emitting opening O. The light exit openings O of the first light exit assisting structures 300B have the same third pitch P3 therebetween. The first light-emitting auxiliary structure 300C may be an organic material such as a black photoresist, or a metal material with high reflectivity. Wherein the ratio of the light-emitting opening O to the surface 204 of the micro light-emitting device 200 is at least greater than or equal to 0.5, which can have better light-emitting efficiency.
In the present embodiment, more specifically, the projection of the micro light emitting device 200 on the substrate 100 completely covers the projection of the light-emitting opening O of the first light-emitting auxiliary structure 300B on the substrate 100, that is, the light-emitting opening O is smaller than the light-emitting surface of the micro light emitting device 200, so that the light-emitting shape can be controlled.
In addition, in the present embodiment, in any two adjacent display regions R1, R2, the minimum thicknesses t1, t2 between the edge of the first light-exiting auxiliary structure 300 and the light-exiting opening O thereof are different from each other, and the design of the light-exiting opening O can be controlled.
Based on the above, in the micro light emitting display device 10C of the embodiment of the invention, the first light extraction auxiliary structure 300C is designed as a reflective layer or an absorption layer, and the position of the light extraction opening O is adjusted to make the light extraction positions of the micro light emitting elements 200 consistent. Therefore, the micro-light emitting display device 10C is relieved from the phenomenon that the stitching line exists between the adjacent display regions R1, R2 by adjusting the display area.
Fig. 5 is a schematic side view of a micro light emitting display device according to a fifth embodiment of the present invention. Referring to fig. 5, the micro light-emitting display device 10D is substantially the same as the micro light-emitting display device 10C of fig. 4B, and the main differences are as follows. In the present embodiment, the micro light-emitting display device 10D further includes a plurality of second light extraction assisting structures 400. The second light-emitting auxiliary structures 400 are respectively disposed in the light-emitting openings O of the first light-emitting auxiliary structure 300C. The second light extraction assisting structures 400 have the same fourth pitch P4 therebetween, and the fourth pitch P4 is the same as the third pitch P3.
In the present embodiment, the second light-exiting auxiliary structure 400 is a light-guiding structure, and the refractive index of the second light-exiting auxiliary structure 400 is greater than 1 and smaller than the refractive index of the micro light-emitting device 200.
In the present embodiment, the projection of the second light-emitting auxiliary structure 400 on the substrate 100 and the projection of the micro light-emitting device 200 on the substrate 100 overlap each other. More specifically, the projection of the micro light emitting device 200 on the substrate 100 completely covers the projection of the second light-exiting auxiliary structure 400 on the substrate 100, i.e. the second light-exiting auxiliary structure 400 is smaller than the light-exiting surface of the micro light emitting device 200.
Based on the above, in the micro light-emitting display device 10D of the embodiment of the invention, in addition to making the light-emitting positions of the micro light-emitting elements 200 uniform by adjusting the positions of the light-emitting openings O of the first light-emitting auxiliary structures 300C, the second light-emitting auxiliary structures 400 are further disposed in the light-emitting openings O. Therefore, the micro light-emitting display device 10C can reduce the splicing line between the adjacent display regions R1 and R2 by reducing the brightness, and further utilize the second light-exiting auxiliary structure 400 to improve the light-exiting efficiency of the micro light-emitting display device 10D.
Fig. 6 is a schematic side view of a micro light emitting display device according to a sixth embodiment of the present invention. Referring to fig. 6, the micro light-emitting display device 10E is substantially the same as the micro light-emitting display device 10D of fig. 5, and the main differences are as follows. In the present embodiment, a portion of the second light-emitting auxiliary structure 400E extends and is disposed on the surface of the first light-emitting auxiliary structure 300C opposite to the micro light-emitting device 200. Here, the projection of the second light-emitting auxiliary structure 400E on the surface of the micro light-emitting device 200 is larger than the projection of the light-emitting opening O on the surface of the micro light-emitting device 200, and the projection of the second light-emitting auxiliary structure 400E on the surface of the micro light-emitting device 200 is the same, thereby increasing the light-emitting efficiency and the uniform display effect. The advantages of the micro light-emitting display device 10E are similar to those of the micro light-emitting display device 10D, and will not be described herein.
Fig. 7A is a schematic top view of a micro light emitting display device according to a seventh embodiment of the present invention. Fig. 7B is a schematic side view of the micro light emitting display device of fig. 7A. Referring to fig. 7A and 7B, the micro light-emitting display device 10F is substantially the same as the micro light-emitting display device 10C of fig. 4B, and the main differences are as follows. In the present embodiment, the first light-emitting auxiliary structures 300F are connected to each other, and the first light-emitting auxiliary structures 300F are disposed in the space between the micro light-emitting devices 200. Here, the first light-extraction auxiliary structure 300F fills the space between the micro light-emitting elements 200, thereby shielding the joint line between the display regions R1 and R2, further slowing down the phenomenon of joint lines in the micro light-emitting display device 10F, and increasing the contrast ratio by a high black-to-black ratio. In an embodiment not shown, the first light exit assisting structure 300F may also only fill the space between the display regions R1, R2.
Fig. 8A is a schematic top view of a micro light emitting display device according to an eighth embodiment of the present invention. Fig. 8B is a schematic side view of the micro light emitting display device of fig. 8A. Referring to fig. 8A and 8B, the micro light-emitting display device 10G is substantially the same as the micro light-emitting display device 10C of fig. 4B, and the main differences are as follows. In the present embodiment, the micro light emitting display device 10F further includes a light transmissive layer 500. The transparent layer 500 is disposed between the first light-emitting auxiliary structure 300G and the micro light-emitting device 200, and the transparent layer 500 is disposed in a space between the micro light-emitting devices 200. That is, the light-transmitting layer 500 can serve as a protection layer of the micro light-emitting device 200, which helps to prevent water in the air from contaminating the micro light-emitting device 200, and further improves the yield of the micro light-emitting display apparatus 10F. The transparent layer 500 may be a plastic material, and the refractive index is greater than 1 and smaller than that of the micro light emitting device 200, so that the light emitting effect of the micro light emitting device 200 is better. Here, the light-emitting auxiliary structure 300G may be a reflective layer or an absorption layer, so that light is emitted through the outlet opening O.
Fig. 9 is a schematic side view of a micro light emitting display device according to a ninth embodiment of the present invention. Referring to fig. 9, the micro light-emitting display device 10H is substantially the same as the micro light-emitting display device 10C of fig. 4B, and the main differences are as follows. In the embodiment, the light-exiting auxiliary structure 300H is a reflective layer or an absorption layer, and has light-exiting openings O1, O2, and O3, respectively. The areas of the light-exiting openings O1, O2, O3 of the light-exiting auxiliary structure 300H gradually increase or gradually decrease across the boundary of any two adjacent display regions R1, R2, wherein the same opening O1, O2 or O3 has the same opening size.
Furthermore, the area ratio between the light exit openings O1, O2, O3 is too large or too small, which in turn leads to a more pronounced phenomenon of stitching. Therefore, in the present embodiment, the area ratio between the light-exiting openings O1, O2, O3 of the light-exiting auxiliary structure 400G preferably falls within the range of 0.8 to 1.2.
Based on the above, by designing the area of the light exit openings O1, O2, O3 to be gradually increasing or gradually decreasing in the vicinity of the stitching line, it also helps to reduce the phenomenon that the stitching line is visually present at the interface between the display regions R1, R2. Preferably, only 10% of the light-emitting openings of the light-emitting auxiliary structure 300H at the boundary have an increasing or gradually decreasing manner, and the light-emitting openings of the middle display area still maintain a consistent opening size, thereby achieving a better display effect.
In summary, in the micro light emitting display device according to an embodiment of the invention, since the light-emitting auxiliary structures disposed on the micro light emitting elements have the same pitch, the effective light-emitting area is redefined, and thus the phenomenon of the existence of the stitching lines between the display regions is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (17)
1. A micro light-emitting display device having a plurality of display regions, comprising:
a substrate;
a plurality of micro light emitting elements disposed on the substrate, and the positions of the plurality of micro light emitting elements define the range of the plurality of display regions, wherein the plurality of micro light emitting elements have a same first pitch with respect to each other in any one display region, and the plurality of micro light emitting elements have a second pitch between boundaries crossing any two adjacent display regions, the first pitch being different from the second pitch; and
and the first light-emitting auxiliary structures are respectively arranged on the micro light-emitting elements, and the first light-emitting auxiliary structures have the same third pitch.
2. The micro light-emitting display device of claim 1, wherein the first pitch is the same as the third pitch.
3. The micro light-emitting display device of claim 1, wherein the plurality of first light extraction assisting structures have a plurality of different areas.
4. The device of claim 1, wherein the plurality of micro light-emitting elements have a plurality of different light-emitting areas, and the plurality of light extraction assisting structures have the same area.
5. The device of claim 1, wherein the first light-exiting auxiliary structures are light-guiding structures, and the refractive index of the first light-exiting auxiliary structures is greater than 1 and smaller than the refractive index of the micro light-emitting elements.
6. The micro light-emitting display device according to claim 1, wherein in the any two adjacent display regions, minimum distances between edges of the plurality of first light extraction assisting structures and edges of the plurality of micro light-emitting elements are different from each other.
7. The micro light-emitting display device of claim 1, wherein the plurality of first light extraction assisting structures are reflective layers or absorbing layers, and each has a light extraction opening.
8. The micro light-emitting display device of claim 7, wherein the light-exiting openings of the first light-exiting auxiliary structures have the same third pitch therebetween.
9. A micro-light emitting display device according to claim 7, wherein the projection of the plurality of micro-light emitting elements on the substrate completely covers the projection of the light exit openings of the plurality of first light exit assisting structures on the substrate.
10. The micro light-emitting display device of claim 7, wherein in any two adjacent display regions, the minimum thicknesses between the edges of the plurality of first light exit assisting structures and the light exit openings thereof are different from each other.
11. The micro light-emitting display device according to claim 7, further comprising:
and the second light-emitting auxiliary structures are respectively arranged in the light-emitting openings of the first light-emitting auxiliary structures, the second light-emitting auxiliary structures have the same fourth pitch, and the fourth pitch is the same as the third pitch.
12. The device of claim 11, wherein the second light-exiting auxiliary structures are light-guiding structures, and the refractive index of the second light-exiting auxiliary structures is greater than 1 and smaller than the refractive index of the micro light-emitting elements.
13. The device of claim 11, wherein a portion of the second light extraction assisting structures is disposed on a surface of the first light extraction assisting structures opposite to the micro light emitting elements.
14. The device of claim 7, wherein the first light extraction assisting structures are connected to each other, and the first light extraction assisting structures are disposed in the spaces between the micro light emitting elements.
15. The micro light-emitting display device according to claim 7, further comprising:
and the light-transmitting layer is arranged between the first light-emitting auxiliary structures and the micro light-emitting elements, and is configured in the space between the micro light-emitting elements.
16. A micro light-emitting display device having a plurality of display regions, comprising:
a substrate;
a plurality of micro light emitting elements disposed on the substrate, and the positions of the plurality of micro light emitting elements define the range of the plurality of display regions, wherein the plurality of micro light emitting elements have a same first pitch with respect to each other in any one display region, and the plurality of micro light emitting elements have a second pitch between boundaries crossing any two adjacent display regions, the first pitch being different from the second pitch; and
a plurality of light-emitting auxiliary structures respectively arranged on the micro light-emitting elements, wherein the light-emitting auxiliary structures are reflecting layers or absorbing layers and respectively provided with a light-emitting opening,
wherein the areas of the light-emitting openings of the plurality of light-emitting auxiliary structures gradually increase or gradually decrease at the boundary crossing any two adjacent display regions.
17. A micro-emissive display device as claimed in claim 16, wherein the area ratio between the light exit openings of the plurality of light exit assisting structures falls in the range of 0.8 to 1.2.
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| CN113451351B (en) | 2023-07-25 |
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