Display device and electronic device

Abstract

The invention relates to a display device and an electronic device. The display device includes: a substrate; and a first light emitting diode unit, a second light emitting diode unit, and a third light emitting diode unit disposed over the substrate, and the first light emitting diode unit includes at least one first light emitting diode emitting light of a first color, the second light emitting diode unit includes at least one second light emitting diode emitting second color light different from the first color light, and the third light emitting diode unit includes at least one third light emitting diode emitting third color light different from the first color light and the second color light. And the plane size of the at least one third light-emitting diode is larger than that of the at least one first light-emitting diode and that of the at least one second light-emitting diode.

Description

Technical Field

[0001] The embodiments relate to display devices and electronic devices. Background Technology

[0002] The display device includes pixels as units for displaying images. Each pixel may include a pixel circuit portion and a light-emitting portion connected to the pixel circuit portion. The light-emitting portion can be implemented in various forms, and for example, the light-emitting portion may include a light-emitting diode (LED) as a light-emitting element. LEDs can have various sizes, and recently, micron- or nanon-sized ultra-miniature LEDs using II-VI or III-V compound semiconductor materials have been developed.

[0003] Light-emitting diodes (LEDs) can be formed directly on a substrate included in a display device, or they can be mounted on a substrate as chips. LEDs can emit light in one of several primary colors.

[0004] The pixel circuitry for driving the light-emitting diodes (LEDs) can be integrated on a substrate or may be included in the LED chip. The pixel circuitry may include multiple transistors and at least one capacitor. The pixel circuitry can control the amount of drive current supplied to the LEDs, causing each LED to emit light of a desired brightness. Summary of the Invention

[0005] The embodiments are intended to provide display devices and electronic devices that can improve both the brightness efficiency and reliability of light-emitting diodes.

[0006] However, the embodiments are not limited to those set forth herein. The above and other embodiments will become more apparent to those skilled in the art upon which this disclosure pertains from the following detailed description of the present disclosure.

[0007] The display device according to an embodiment includes: a substrate; and a first light-emitting diode unit, a second light-emitting diode unit, and a third light-emitting diode unit disposed on the substrate, wherein the first light-emitting diode unit includes at least one first light-emitting diode that emits light of a first color, the second light-emitting diode unit includes at least one second light-emitting diode that emits light of a second color different from the first light-emitting diode, and the third light-emitting diode unit includes at least one third light-emitting diode that emits light of a third color different from the first light-emitting diode and the second light-emitting diode, and the planar dimension of the at least one third light-emitting diode is larger than the planar dimension of the at least one first light-emitting diode and the planar dimension of the at least one second light-emitting diode.

[0008] The shortest width of at least one third light-emitting diode in the plan view may be greater than the shortest width of at least one first light-emitting diode in the plan view and the shortest width of at least one second light-emitting diode in the plan view.

[0009] The shortest width of at least one third light-emitting diode may be greater than or equal to the reference size, and at least one of the shortest widths of at least one first light-emitting diode and at least one second light-emitting diode may be less than the reference size.

[0010] The reference size can be in the range of approximately 3 micrometers to approximately 5 micrometers.

[0011] The shortest width of at least one third light-emitting diode can be less than approximately 10 micrometers.

[0012] The number of at least one first light-emitting diode included in the first light-emitting diode unit and the number of at least one second light-emitting diode included in the second light-emitting diode unit may be greater than the number of at least one third light-emitting diode included in the third light-emitting diode unit.

[0013] The display device may further include a driving circuit portion disposed between each of the first light-emitting diode unit, the second light-emitting diode unit, and the third light-emitting diode unit and the substrate.

[0014] The display device may further include: a pixel circuit portion electrically connected to at least one first electrode of at least one first light-emitting diode, at least one second light-emitting diode, and at least one third light-emitting diode, and the pixel circuit portion may include a plurality of transistors.

[0015] The driving circuit section may include the pixel circuit section.

[0016] The pixel circuit section can be located between the substrate and the driving circuit section.

[0017] The planar shape of at least one of the first light-emitting diode, at least one second light-emitting diode, and at least one third light-emitting diode may be circular or rectangular.

[0018] The display device according to another embodiment includes: a substrate; and a first light-emitting diode unit and a second light-emitting diode unit disposed on the substrate, wherein the first light-emitting diode unit includes at least one green light-emitting diode, the second light-emitting diode unit includes at least one blue light-emitting diode, the shortest width of the second light-emitting diode in a plan view is about 3 micrometers or more, and the shortest width of at least one first light-emitting diode in a plan view is less than about 3 micrometers.

[0019] The shortest width of at least one first light-emitting diode can be less than about 10 micrometers.

[0020] The number of at least one first light-emitting diode included in the first light-emitting diode unit may be greater than the number of at least one second light-emitting diode included in the second light-emitting diode unit.

[0021] The display device may further include a driving circuit section disposed between each of the first and second light-emitting diode units and the substrate.

[0022] The display device may further include: a pixel circuit portion electrically connected to at least one first electrode of at least one first light-emitting diode and at least one second light-emitting diode, and the pixel circuit portion may include a plurality of transistors.

[0023] The driving circuit section may include the pixel circuit section.

[0024] The pixel circuit section can be located between the substrate and the driving circuit section.

[0025] The electronic device according to an embodiment includes: a substrate; and a first light-emitting diode unit, a second light-emitting diode unit, and a third light-emitting diode unit disposed on the substrate, wherein the first light-emitting diode unit includes at least one first light-emitting diode that emits light of a first color, the second light-emitting diode unit includes at least one second light-emitting diode that emits light of a second color different from the first light-emitting diode, and the third light-emitting diode unit includes at least one third light-emitting diode that emits light of a third color different from the first light-emitting diode and the second light-emitting diode, and the planar dimension of the at least one third light-emitting diode is larger than the planar dimension of the at least one first light-emitting diode and the planar dimension of the at least one second light-emitting diode.

[0026] The shortest width of at least one third light-emitting diode in the plan view may be greater than the shortest width of at least one first light-emitting diode in the plan view and the shortest width of at least one second light-emitting diode in the plan view.

[0027] According to the embodiments, both the brightness efficiency and reliability of the light-emitting diodes in the display device can be improved. Attached Figure Description

[0028] Figure 1 This is a schematic block diagram of a display device according to an embodiment.

[0029] Figure 2 This is a schematic plan view of the display portion of a display device according to an embodiment.

[0030] Figure 3The graph shows the variation of the external quantum efficiency (EQE) of the light-emitting diode with respect to the current applied to it for light-emitting diodes with various planar dimensions.

[0031] Figure 4 This is a graph showing the peak value of the external quantum efficiency based on the planar dimensions of the light-emitting diode.

[0032] Figure 5A , Figure 5B and Figure 5C This is a graph showing the external quantum efficiency based on the planar dimensions of each of the red, green, and blue LEDs.

[0033] Figure 6A , Figure 6B and Figure 6C It is a diagram showing the brightness based on the planar dimensions of each of the red, green, and blue LEDs.

[0034] Figure 7 This is a graph showing the normalized external quantum efficiency as a function of time for red, green, and blue LEDs of various planar sizes.

[0035] Figure 8 This is a graph showing the normalized external quantum efficiency as a function of time for red, green, and blue LEDs of various planar sizes.

[0036] Figure 9 , Figure 10 and Figure 11 Each of these is a schematic plan view of the display portion of a display device according to an embodiment.

[0037] Figure 12 This is a schematic perspective view showing a cross-section of a light-emitting diode according to an embodiment.

[0038] Figure 13 This is a schematic diagram of the equivalent circuit of a pixel in a display device according to an embodiment.

[0039] Figure 14 This is a schematic perspective view of the light-emitting diode unit of a display device according to an embodiment.

[0040] Figure 15 , Figure 16 and Figure 17 Each of these is a schematic cross-sectional view of a display device according to an embodiment.

[0041] Figure 18 An example of a display device applied to a mobile device according to an embodiment is shown.

[0042] Figure 19 An example of a display device according to an embodiment being applied to a display device for a vehicle is shown.

[0043] Figure 20 An example of a display device according to an embodiment being applied to augmented reality glasses or virtual reality glasses is shown.

[0044] Figure 21 An example of a display device according to an embodiment being applied to a wearable display device is shown. Detailed Implementation

[0045] This disclosure will now be described more fully below with reference to the accompanying drawings, in which embodiments are illustrated. However, this disclosure may be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, it is provided so that this disclosure will be thorough and complete, and these embodiments will fully convey the scope of this disclosure to those skilled in the art.

[0046] In the accompanying drawings, the size, thickness, ratio, and dimensions of elements may be enlarged for ease of description and clarity. The same reference numerals and reference characters always refer to the same elements.

[0047] In this specification, it will be understood that when an element (or area, layer, portion, etc.) is referred to as being "on," "connected to," or "coupled to" another element, the element may be directly on, directly connected to, or directly coupled to the other element, or one or more intermediary elements may exist between the element and the other element. In a similar sense, when an element (or area, layer, portion, etc.) is described as "covering" another element, the element may directly cover the other element, or one or more intermediary elements may exist between the element and the other element.

[0048] In the specification, when an element is "directly on" another element, "directly connected to" another element, or "directly coupled to" another element, there is no intermediary element. For example, "directly on" can mean that two layers or two elements are disposed without any additional elements such as adhesive elements between the two layers or the two elements.

[0049] Unless the context clearly indicates otherwise, expressions used in the singular form as used herein (such as “a,” “one,” and “the”) are also intended to include the plural form.

[0050] As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items. For example, “A and / or B” can be understood to mean “A, B, or A and B”. The terms “and” and “or” can be used in the sense of conjunction and disjunction and can be understood as equivalent to “and / or”.

[0051] In the specification and claims, for purposes of meaning and interpretation, the term "at least one of..." is intended to include the meaning of "at least one of the group consisting of...". For example, "at least one of A, B, and C" can be understood to mean only A, only B, only C, or any combination of two or more of A, B, and C, such as ABC, AB, BC, or AC. When preceding / following a list of elements, the term "at least one of..." modifies the entire list of elements and does not modify any individual element in that list.

[0052] It will be understood that although the terms first, second, etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. Therefore, without departing from the teachings of this disclosure, a first element may be referred to as a second element. Similarly, without departing from the scope of this disclosure, a second element may be referred to as a first element.

[0053] For ease of description, the spatial relative terms “below,” “under,” “down,” “above,” or “above,” etc., may be used herein to describe the relationship between one element or component and another, as shown in the accompanying drawings. It will be understood that, in addition to the orientation depicted in the drawings, the spatial relative terms are also intended to cover different orientations of the device in use or operation. For example, in the case where the device shown in the drawings is flipped, a device positioned “below” or “under” another device may be placed “above” another device. Therefore, the illustrative term “below” can include both a lower and an upper position. The device may also be oriented in other directions, and thus the spatial relative terms may be interpreted differently depending on the orientation.

[0054] Given the measurements discussed and the errors associated with the measurement of the recorded quantities (i.e., the limitations of the measurement system), the terms “about” or “approximately” as used herein include the stated values ​​and mean within an acceptable range of deviation from the recorded values ​​as determined by one of ordinary skill in the art. For example, “about” may mean within one or more standard deviations, or within ±20%, ±10%, or ±5% of the stated values.

[0055] It should be understood that the terms “comprises,” “includes,” “have,” and “containing” are intended to indicate the presence of the stated features, integers, steps, operations, elements, components, or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

[0056] Unless otherwise defined or implied herein, all terms used (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that, unless expressly defined in the specification, terms (such as those defined in a general dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant field and should not be interpreted in an idealized or overly formalized sense.

[0057] Embodiments have been disclosed herein, and although terminology has been used, it is used and interpreted in a general and descriptive sense only and is not intended to be limiting. In some instances, as will be apparent to those skilled in the art, features, characteristics, and / or elements described in connection with the embodiments may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless specifically instructed otherwise. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of this disclosure as set forth in the claims.

[0058] Figure 1 This is a schematic block diagram of a display device according to an embodiment.

[0059] Reference Figure 1 The display device 300 according to the embodiment may be a light-emitting display device including a light-emitting element. The display device 300 may be implemented as a flexible display device, a rollable display device, a bendable display device, a transparent display device, or a mirror display device, etc. The display device 300 may be an electronic device including a display surface that displays an image in at least one surface, such as a smartphone, television, tablet PC, mobile phone, image phone, e-book reader, desktop PC, laptop PC, notebook computer, workstation, server, personal digital assistant (PDA), portable multimedia player (PMP), Moving Image Experts Group Audio Layer 3 (MP3) player, medical device, camera, or wearable device.

[0060] Reference Figure 1The display device 300 may include a display section DA, a scan driving section 400, a data driving section 500, and a processor 600.

[0061] The display portion DA may include a pixel PX disposed on a surface extending in a first direction DR1 and a second direction DR2, scan lines SL1, SL2 and SL3 (or gate lines) for transmitting scan signals to the pixel PX, and a data line DL for transmitting data signals to the pixel PX.

[0062] Each pixel PX can be a unit for displaying an image and can emit light with a brightness corresponding to the data signal transmitted via data line DL in response to the scan signals transmitted via scan lines SL1, SL2, and SL3. The entire area where the pixel PX is set can be referred to as the display portion DA, and the area surrounding the display portion DA can be referred to as the peripheral area. The display portion DA can display an image in a direction perpendicular to the first direction DR1 and the second direction DR2.

[0063] Each pixel PX may include a pixel circuit section containing transistors and a light-emitting element.

[0064] A pixel PX can include pixels that can emit different colors of light. For example, a pixel PX can include red pixels that can emit red light, green pixels that can emit green light, and blue pixels that can emit blue light.

[0065] For example, each of scan lines SL1, SL2, and SL3 can be elongated in the first direction DR1. A set of first scan lines SL1, second scan lines SL2, and third scan lines SL3 can be set for each pixel row to connect to the pixel PX of the corresponding pixel row. Scan lines SL1, SL2, and SL3 can be connected to the scan drive section 400 to receive scan signals from the scan drive section 400.

[0066] For example, the data line DL can be extended in the second direction DR2. The data line DL can be connected to the data driver section 500 to receive data signals from the data driver section 500.

[0067] The scan driving section 400 can generate scan signals (e.g., gate signals with on-voltage levels of conducting transistors) and can sequentially provide scan signals to scan lines SL1, SL2, and SL3. The scan driving section 400 may include transistors disposed in and integrated within the peripheral region of the display device 300.

[0068] According to an embodiment, the display device 300 may further include a light emission control driving section that generates a light emission control signal (e.g., a light emission control signal having a conduction voltage level of a conduction transistor).

[0069] The processor 600 can control the scan signal and data signal provided to each pixel PX by controlling the operation of the scan drive section 400 and the data drive section 500, based on the data of the image to be displayed in the display section DA.

[0070] Reference Figure 1 and Figure 2 The display portion DA of the display device 300 according to an embodiment is described.

[0071] Figure 2 This is a schematic plan view of the display portion of a display device according to an embodiment.

[0072] Reference Figure 2 The display device 300 according to the embodiment (see Figure 1 The display portion DA may include a base SUB and a first pixel PXr, a second pixel PXg, and a third pixel PXb disposed above the base SUB. Each of the first pixel PXr, the second pixel PXg, and the third pixel PXb may be a pixel PX described above (see [link to documentation]). Figure 1 ).

[0073] The substrate SUB can be any substrate. According to embodiments, the substrate SUB may comprise an insulating material such as glass or a polymer resin. The polymer resin may comprise at least one material such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, and polyimide resin.

[0074] The first pixel PXr, the second pixel PXg, and the third pixel PXb can emit different colors of light. For example, the first pixel PXr can emit red light, the second pixel PXg can emit green light, and the third pixel PXb can emit blue light.

[0075] The first pixel PXr, the second pixel PXg, and the third pixel PXb can be uniformly or regularly arranged on a plane. For example, the first pixel PXr and the third pixel PXb can be alternately arranged in the first direction DR1 and the second direction DR2. The first pixel PXr and the second pixel PXg can be alternately arranged in the first tilt direction, which forms approximately 45 degrees with the first direction DR1 and the second direction DR2. The third pixel PXb and the second pixel PXg can be alternately arranged in the second tilt direction, which forms approximately 45 degrees with the first direction DR1 and the second direction DR2 and is approximately perpendicular to the first tilt direction.

[0076] Each pixel PX may include a light-emitting diode (LED) unit. For example, the first pixel PXr may include a first LED unit 100Ur, the second pixel PXg may include a second LED unit 100Ug, and the third pixel PXb may include a third LED unit 100Ub.

[0077] Each LED unit can be a light-emitting element and can include at least one LED and a driving circuit portion connected to the LED. For example, a first LED unit 100Ur can include at least one first LED 101r and a driving circuit portion 700 connected to the first LED 101r, a second LED unit 100Ug can include at least one second LED 101g and a driving circuit portion 700 connected to the second LED 101g, and a third LED unit 100Ub can include at least one third LED 101b and a driving circuit portion 700 connected to the third LED 101b.

[0078] The first light-emitting diode 101r can emit red light, the second light-emitting diode 101g can emit green light, and the third light-emitting diode 101b can emit blue light. The first, second, and third colors can represent different colors.

[0079] At least one of the first light-emitting diode 101r, the second light-emitting diode 101g, and the third light-emitting diode 101b may have a planar shape such as a circle or a rectangle. For example, refer to Figure 2 The planar shape of each of the first light-emitting diode 101r, the second light-emitting diode 101g, and the third light-emitting diode 101b can be a rectangle with a short side and a long side, the length of the long side being equal to or longer than the length of the short side. Figure 2 An example is shown where the planar shape of each of the first light-emitting diode 101r, the second light-emitting diode 101g, and the third light-emitting diode 101b is square.

[0080] According to an embodiment, the first light-emitting diode 101r, the second light-emitting diode 101g, and the third light-emitting diode 101b may have the same planar shape. According to an embodiment, at least two of the first light-emitting diode 101r, the second light-emitting diode 101g, and the third light-emitting diode 101b may have different planar shapes. For example, the planar shape of the third light-emitting diode 101b may be rectangular, and the planar shape of the first light-emitting diode 101r or the second light-emitting diode 101g may be circular.

[0081] The planar dimensions of the third LED 101b can be larger than the planar dimensions of the first LED 101r and the second LED 101g. When viewed on a surface parallel to the first direction DR1 and the second direction DR2 (or in a plan view), the planar dimensions can be determined based on the length of the shortest side or the planar area of ​​each LED. The length of the shortest side can be considered as the shortest width. For example, referring to... Figure 2 In the plan view, the shortest width Wb of the third light-emitting diode 101b can be greater than the shortest width Wr of the first light-emitting diode 101r, and the shortest width Wb of the third light-emitting diode 101b can be greater than the shortest width Wg of the second light-emitting diode 101g.

[0082] The planar dimensions of the first light-emitting diode 101r can be the same as or different from the planar dimensions of the second light-emitting diode 101g. For example, the shortest width Wr of the first light-emitting diode 101r can be the same as or different from the shortest width Wg of the second light-emitting diode 101g.

[0083] The shortest width Wb of the third LED 101b can be greater than or equal to the reference size, and at least one of the shortest width Wr of the first LED 101r and the shortest width Wg of the second LED 101g can be less than the reference size. The reference size can be determined in the range of approximately 3 micrometers to approximately 5 micrometers, and if further restricted, the reference size can be determined to be approximately 3 micrometers. For example, the shortest width Wb of the third LED 101b can be approximately 3 micrometers or greater, and each of the shortest width Wr of the first LED 101r and the shortest width Wg of the second LED 101g can be less than approximately 3 micrometers. The shortest width Wb of the third LED 101b can be less than approximately 10 micrometers.

[0084] The first pixel PXr or the first light-emitting diode unit 100Ur may include a first light-emitting region PXAr, the second pixel PXg or the second light-emitting diode unit 100Ug may include a second light-emitting region PXAg, and the third pixel PXb or the third light-emitting diode unit 100Ub may include a third light-emitting region PXAb. Each of the light-emitting regions PXAr, PXAg, and PXAb can be a region where at least one light-emitting diode included in each pixel PX completely emits light, and can be a region surrounded by an outer boundary, which is the envelope of the region where at least one light-emitting diode is disposed.

[0085] The planar shape of at least one of the first luminescent region PXAr, the second luminescent region PXAg, and the third luminescent region PXAb can be rectangular or circular.

[0086] The areas of the first luminescent region PXAr, the second luminescent region PXAg, and the third luminescent region PXAb can be the same, or at least two of the first luminescent region PXAr, the second luminescent region PXAg, and the third luminescent region PXAb can have different areas. Figure 2 An example is shown where the areas of the first luminescent region PXAr, the second luminescent region PXAg, and the third luminescent region PXAb are substantially the same.

[0087] The number of light-emitting diodes 101r, 101g, and 101b included in the light-emitting diode units 100Ur, 100Ug, and 100Ub can vary depending on the planar dimensions of the light-emitting regions PXAr, PXAg, and PXAb, as well as the planar dimensions of the light-emitting diodes 101r, 101g, and 101b.

[0088] According to an embodiment, the number of first light-emitting diodes 101r included in the first light-emitting diode unit 100Ur can be greater than the number of third light-emitting diodes 101b included in the third light-emitting diode unit 100Ub. According to an embodiment, the number of second light-emitting diodes 101g included in the second light-emitting diode unit 100Ug can be greater than the number of third light-emitting diodes 101b included in the third light-emitting diode unit 100Ub. The number of first light-emitting diodes 101r included in the first light-emitting diode unit 100Ur can be equal to or different from the number of second light-emitting diodes 101g included in the second light-emitting diode unit 100Ug. Figure 2 An example is shown where the number of first light-emitting diodes 101r included in the first light-emitting diode unit 100Ur is the same as the number of second light-emitting diodes 101g included in the second light-emitting diode unit 100Ug, and for example, the number of first light-emitting diodes 101r included in the first light-emitting diode unit 100Ur can be 9. Figure 2 An example is shown where the number of third light-emitting diodes 101b included in the third light-emitting diode unit 100Ub is one, but the embodiment is not limited thereto.

[0089] A driving circuit portion 700 for each of the light-emitting diode units 100Ur, 100Ug, and 100Ub may be disposed between the light-emitting diodes 101r, 101g, and 101b and the substrate SUB, and may, for example, overlap with each of the light-emitting diodes 101r, 101g, and 101b corresponding to the driving circuit portion 700 in a plan view. The driving circuit portion 700 may include driving circuitry for driving the light-emitting diodes 101r, 101g, and 101b. The driving circuit portion 700 may include pixel circuitry electrically connected to each of the light-emitting diodes 101r, 101g, and 101b. The pixel circuitry portion may be disposed between the substrate SUB and the substrate SUB. Figure 16 The light-emitting diode unit 100UNb shown is illustrated.

[0090] The area between adjacent LED units 100Ur, 100Ug, and 100Ub, or adjacent pixels PXr, PXg, and PXb, may include wiring areas SLA through which various signal lines or voltage lines pass.

[0091] Reference Figures 3 to 8 as well as Figure 2 The display device 300 according to an embodiment will now be described (see Figure 1 The characteristics and effects of the first light-emitting diode 101r, the second light-emitting diode 101g, and the third light-emitting diode 101b.

[0092] Figure 3 The graph shows the variation of the external quantum efficiency (EQE) of the light-emitting diode with respect to the current applied to it for light-emitting diodes with various planar dimensions. Figure 3 Each of the 1.7 micrometers (μm), 2 micrometers, 6 micrometers, 10 micrometers, and 18 micrometers described represents a planar dimension of the light-emitting diode (e.g., the length of the shortest side (e.g., the shortest width)). See also... Figure 3 It can be seen that when the planar dimensions of the LED (e.g., the shortest width) are approximately 10 micrometers or larger, the external quantum efficiency (EQE) of the LED does not increase significantly. However, when the planar dimensions of the LED are less than approximately 10 micrometers, the EQE increases significantly, and when the planar dimensions of the LED become less than approximately 6 micrometers, the EQE increases dramatically. The external quantum efficiency (EQE) can generally be a value proportional to the internal quantum efficiency (IQE) and light extraction efficiency of the LED. With a higher external quantum efficiency (EQE), the light efficiency can be higher, resulting in a higher luminance efficiency for the LED.

[0093] Figure 4 This is a graph showing the peak value of the external quantum efficiency based on the planar dimensions of the light-emitting diode. Figure 4 This shows the planar dimensions of a light-emitting diode (LED) based on its diameter. (Refer to...) Figure 4 It can be confirmed that when the planar dimensions (e.g., diameter) of the light-emitting diode are less than about 10 micrometers, the peak value of the external quantum efficiency (EQE) of the light-emitting diode increases significantly.

[0094] Figure 5A , Figure 5B and Figure 5C This is a graph showing the external quantum efficiency based on the planar dimensions of each of the red, green, and blue LEDs, and Figure 6A , Figure 6B and Figure 6C This is a graph showing the brightness based on the planar dimensions of each of the red, green, and blue LEDs. Figure 5A , Figure 5B and Figure 5C as well as Figure 6A , Figure 6B and Figure 6C In the diagram, each of the horizontally arranged 1.5 micrometers, 1.5 micrometers, 3 micrometers and 5 micrometers represents the planar dimension of the light-emitting diode (e.g., the length of the shortest side (e.g., the shortest width)), and each of the 1.25 micrometer space and 3 micrometer space described below each of the 1.5 micrometers, 1.5 micrometers, 3 micrometers and 5 micrometers represents the spacing between adjacent light-emitting diodes. Figure 5A , Figure 5B , Figure 5C , Figure 6A , Figure 6B and Figure 6C In this context, "blue," "green," and "red" represent blue, green, and red LEDs, respectively. (See reference...) Figure 5A , Figure 5B and Figure 5C as well as Figure 6A , Figure 6B and Figure 6C It can be seen that when the planar size of the light-emitting diode is about 5 micrometers or smaller, regardless of the color of the light-emitting diode, as the planar size (e.g., the shortest width) of the light-emitting diode decreases, the external quantum efficiency (EQE) and brightness continue to increase.

[0095] Figure 7 This is a graph showing the normalized external quantum efficiency as a function of time for red, green, and blue LEDs of various planar sizes. Figure 8 This is a graph showing the normalized external quantum efficiency as a function of time for red, green, and blue LEDs of various planar sizes. Figure 7 This is the result of a long-term reliability assessment of the light-emitting diode, and Figure 8 This is the result of a short-term reliability assessment of the LED following a long-term reliability assessment. Figure 7 and Figure 8 The "blue," "green," and "red" in the text represent blue, green, and red light-emitting diodes, respectively. Figure 7 and Figure 8 The numbers 1.5 micrometers and 5 micrometers represent the planar dimensions (e.g., the shortest width) of each light-emitting diode.

[0096] Reference Figure 7 It can be seen that the external quantum efficiency (EQE) of each of the green and red LEDs with planar dimensions of approximately 1.5 micrometers and approximately 5 micrometers, respectively, does not change significantly over time. However, compared to red or green LEDs with the same planar dimensions as the blue LED, the EQE of the blue LED decreases rapidly over time as its planar dimension decreases from approximately 5 micrometers to approximately 1.5 micrometers. For example, it can be seen that, unlike LEDs of the other color, the long-term reliability of the blue LED deteriorates significantly when its planar dimension is less than approximately 5 micrometers.

[0097] Reference Figure 8 It can be seen that the external quantum efficiency (EQE) of each of the green and red LEDs with planar dimensions of approximately 1.5 micrometers and approximately 5 micrometers, respectively, does not change significantly even in the short term after their long-term operation (e.g., after their long-term reliability assessment). However, compared to red or green LEDs with the same planar dimensions as the blue LED, the EQE of the blue LED decreases in the short term as the planar dimension decreases from approximately 5 micrometers to approximately 1.5 micrometers. For example, it can be seen that, unlike LEDs of the other color, the short-term reliability of the blue LED deteriorates when the planar dimension is less than approximately 5 micrometers.

[0098] Based on Figures 3 to 8 The data for the external quantum efficiency (EQE) of the planar dimensions of the light-emitting diode shown are combined with... Figure 2When the planar dimensions of each of the first LED 101r (red LED) and the second LED 101g (green LED) are less than approximately 10 micrometers, the external quantum efficiency (EQE) of each of the first LED 101r and the second LED 101g can be continuously increased. Furthermore, since the EQE can be maximized when the planar dimensions of each of the first LED 101r and the second LED 101g are less than a reference size in the range of approximately 3 to approximately 5 micrometers, maximizing the luminous efficiency or brightness efficiency is possible. When the planar dimensions of each of the first LED 101r and the second LED 101g are less than a reference size in the range of approximately 3 to approximately 5 micrometers, the luminous efficiency or brightness efficiency does not decrease over time (i.e., it does not decrease in terms of reliability). Therefore, in the embodiments, the planar dimensions of each of the first LED 101r and the second LED 101g can be made smaller than a reference size in the range of approximately 3 to approximately 5 micrometers, making it possible to maximize the luminous efficiency or brightness efficiency without reducing reliability.

[0099] If the planar dimension of the third light-emitting diode 101b (blue light-emitting diode) is less than approximately 10 micrometers, the external quantum efficiency (EQE) of the third light-emitting diode 101b can be continuously increased. However, if the planar dimension of the third light-emitting diode 101b is smaller than a reference dimension in the range of approximately 3 to approximately 5 micrometers, the luminous efficiency or brightness efficiency may decrease significantly over time, potentially leading to a decrease in reliability. Therefore, in this embodiment, the planar dimension of the third light-emitting diode 101b can be made greater than or equal to a reference dimension in the range of approximately 3 to approximately 5 micrometers, and can be made less than approximately 10 micrometers, thereby increasing the reliability over time while simultaneously increasing the luminous efficiency or brightness efficiency.

[0100] Reference Figure 9 The accompanying drawings described above illustrate the display portion of a display device according to an embodiment. (The remaining text will be omitted.) Figure 9 The embodiments described herein have the same structure and features as the embodiments described above.

[0101] Figure 9 This is a schematic plan view of the display portion of a display device according to an embodiment.

[0102] Reference Figure 9 and combined Figure 2 The display portion DA of the display device according to the embodiment can be the same as described above. Figure 2 The display device 300 shown (see Figure 1The display portion DA is almost identical to the first light-emitting diode unit 100Ur provided in the display portion DA, but the first light-emitting diode unit 100Ur provided in the display portion DA may include at least one first light-emitting diode 102r and a driving circuit portion 700 connected to the first light-emitting diode 102r, the second light-emitting diode unit 100Ug provided in the display portion DA may include at least one second light-emitting diode 102g and a driving circuit portion 700 connected to the second light-emitting diode 102g, and the third light-emitting diode unit 100Ub provided in the display portion DA may include at least one third light-emitting diode 102b and a driving circuit portion 700 connected to the third light-emitting diode 102b.

[0103] The first light-emitting diode 102r can have the same characteristics as the first light-emitting diode 101r described above, the second light-emitting diode 102g can have the same characteristics as the second light-emitting diode 101g described above, and the third light-emitting diode 102b can have the same characteristics as the third light-emitting diode 101b described above. However, as described above... Figure 2 The embodiments shown are different. Figure 9 An example is shown where the number of third light-emitting diodes 102b included in the third light-emitting diode unit 100Ub is provided as multiple (e.g., 4).

[0104] Reference Figure 10 The accompanying drawings described above illustrate the display portion of a display device according to an embodiment. (The remaining text will be omitted.) Figure 10 The embodiments described herein have the same structure and features as the embodiments described above.

[0105] Figure 10 This is a schematic plan view of the display portion of a display device according to an embodiment.

[0106] Reference Figure 10 and combined Figure 2 The display portion DA of the display device according to the embodiment can be the same as described above. Figure 2 The display device 300 shown (see Figure 1The display portion DA is almost identical to the first light-emitting diode unit 100Ur provided in the display portion DA, but the first light-emitting diode unit 100Ur provided in the display portion DA may include at least one first light-emitting diode 103r and a driving circuit portion 700 connected to the first light-emitting diode 103r, the second light-emitting diode unit 100Ug provided in the display portion DA may include at least one second light-emitting diode 103g and a driving circuit portion 700 connected to the second light-emitting diode 103g, and the third light-emitting diode unit 100Ub provided in the display portion DA may include at least one third light-emitting diode 103b and a driving circuit portion 700 connected to the third light-emitting diode 103b.

[0107] The first light-emitting diode 103r can be almost identical to the first light-emitting diode 101r described above, but can have a circular planar shape. The second light-emitting diode 103g can be almost identical to the second light-emitting diode 101g described above, but can have a circular planar shape. The third light-emitting diode 103b can be almost identical to the third light-emitting diode 101b described above, but can have a circular planar shape.

[0108] The shortest width Wb (e.g., diameter) of the third LED 103b can be greater than or equal to a reference size, and at least one of the shortest width Wr (e.g., diameter) of the first LED 103r and the shortest width Wg (e.g., diameter) of the second LED 103g can be smaller than the reference size. The reference size can be determined in the range of approximately 3 micrometers to approximately 5 micrometers, and if further restricted, the reference size can be determined to be approximately 3 micrometers. For example, the shortest width Wb (e.g., diameter) of the third LED 103b can be approximately 3 micrometers or greater, and each of the shortest width Wr (e.g., diameter) of the first LED 103r and the shortest width Wg (e.g., diameter) of the second LED 103g can be less than approximately 3 micrometers. The shortest width Wb (e.g., diameter) of the third LED 103b can be less than approximately 10 micrometers.

[0109] Reference Figure 11 The accompanying drawings described above illustrate the display portion of a display device according to an embodiment. (The remaining text will be omitted.) Figure 10 The embodiments described herein have the same structure and characteristics as the embodiments described above.

[0110] Figure 11 This is a schematic plan view of the display portion of a display device according to an embodiment.

[0111] Reference Figure 11 and combined Figure 2 , Figure 9 and Figure 10The display portion DA of the display device according to the embodiment can be the same as described above. Figure 10 The display portions DA of the display devices shown are almost identical, but the first light-emitting diode unit 100Ur provided in the display portion DA may include at least one first light-emitting diode 104r and a driving circuit portion 700 connected to the first light-emitting diode 104r, the second light-emitting diode unit 100Ug provided in the display portion DA may include at least one second light-emitting diode 104g and a driving circuit portion 700 connected to the second light-emitting diode 104g, and the third light-emitting diode unit 100Ub provided in the display portion DA may include at least one third light-emitting diode 104b and a driving circuit portion 700 connected to the third light-emitting diode 104b.

[0112] The first light-emitting diode 104r may have the same characteristics as each of the first light-emitting diodes 101r, 102r, and 103r described above; the second light-emitting diode 104g may have the same characteristics as each of the second light-emitting diodes 101g, 102g, and 103g described above; and the third light-emitting diode 104b may have the same characteristics as each of the third light-emitting diodes 101b, 102b, and 103b described above. However, as described above... Figure 10 The embodiments shown are different. Figure 11 An example is shown where the number of third light-emitting diodes 104b included in the third light-emitting diode unit 100Ub is provided as multiple (e.g., 4).

[0113] Reference Figure 12 The foregoing figures describe the cross-section of a light-emitting diode according to an embodiment.

[0114] Figure 12 This is a schematic perspective view showing a cross-section of a light-emitting diode according to an embodiment.

[0115] According to the embodiments, the light-emitting diode 100 included in the display device may be a miniature light-emitting diode (or an ultra-small light-emitting diode) having a planar size of about 10 micrometers or smaller.

[0116] The light-emitting diode 100 according to the embodiment may have an epitaxial structure grown on a substrate. For example, the light-emitting diode 100 may be formed by growing on a semiconductor substrate such as a silicon wafer. For example, the light-emitting diode 100 may include a first semiconductor layer 110, an active layer 120 above the first semiconductor layer 110, and a second semiconductor layer 130 above the active layer 120.

[0117] Each of the first semiconductor layer 110 and the second semiconductor layer 130 may comprise a group II-VI compound semiconductor material or a group III-V compound semiconductor material (e.g., a nitride semiconductor material). For example, each of the first semiconductor layer 110 and the second semiconductor layer 130 may comprise at least one nitride semiconductor material selected from InAlGaN, GaN, AlGaN, InGaN, AlN, and InN. Each of the first semiconductor layer 110 and the second semiconductor layer 130 may be used to provide electrons and holes to the active layer 120. For this purpose, the first semiconductor layer 110 may be doped with a first conductivity type dopant, and the second semiconductor layer 130 may be doped with a second conductivity type dopant with an electrical polarity opposite to that of the first conductivity type dopant. For example, the first semiconductor layer 110 may be doped with an n-type dopant, and the second semiconductor layer 130 may be doped with a p-type dopant, or conversely, the first semiconductor layer 110 may be doped with a p-type dopant, and the second semiconductor layer 130 may be doped with an n-type dopant. The first semiconductor layer 110 or the second semiconductor layer 130, which is doped with n-type dopant, can provide electrons to the active layer 120, and the second semiconductor layer 130 or the first semiconductor layer 110, which is doped with p-type dopant, can provide holes to the active layer 120.

[0118] An active layer 120 may be disposed between a first semiconductor layer 110 and a second semiconductor layer 130. The active layer 120 may have at least one quantum well structure in which quantum wells are disposed between barriers. Light can be generated when electrons and holes supplied from the first semiconductor layer 110 and the second semiconductor layer 130 recombine within the quantum wells of the active layer 120. The wavelength of the light generated from the active layer 120 can be determined based on the band gap of the material constituting the quantum wells within the active layer 120. The active layer 120 may have only one quantum well, but may have a multiple quantum well (MQW) structure in which quantum wells and barriers are alternately arranged. The active layer 120 may comprise a group II-VI compound semiconductor material or a group III-V compound semiconductor material (e.g., a nitride semiconductor material). For example, the active layer 120 may comprise at least one nitride semiconductor material selected from InGaN, GaN, AlGaN, and AlInGaN.

[0119] From the above embodiments (for example, such as Figure 2 , Figure 9 , Figure 10 and Figure 11The colors represented by each of the first light-emitting diodes 101r, 102r, 103r and 104r (shown), each of the second light-emitting diodes 101g, 102g, 103g and 104g, and each of the third light-emitting diodes 101b, 102b, 103b and 104b can vary depending on the type and ratio of materials included in the active layer 120 or the material composition of each of the first semiconductor layer 110 and the second semiconductor layer 130.

[0120] The light-emitting diode 100 may also include a current diffusion layer 140, at least one insulating layer 150 and 160, a first electrode 170, and a second electrode 180.

[0121] A current diffusion layer 140 may be disposed on the second semiconductor layer 130 and electrically connected to the first electrode 170 to perform the function of diffusing current from the first electrode 170 to a wider region. The current diffusion layer 140 may comprise a conductive material such as ITO, TCO, or IZO. In another example, the current diffusion layer 140 may be omitted.

[0122] The first semiconductor layer 110, the active layer 120, the second semiconductor layer 130, and the current diffusion layer 140 can have a vertically stacked structure on the third-direction DR3.

[0123] At least one insulating layer 150 and 160 may comprise a first insulating layer 150 comprising a nitride material such as aluminum nitride and a second insulating layer 160 comprising an oxide material such as silicon oxide. The first insulating layer 150 may be in contact with the side and top surfaces of a vertically stacked structure of a first semiconductor layer 110, an active layer 120, a second semiconductor layer 130, and a current diffusion layer 140. The ratio of electrons, holes, or photons exiting through the side surfaces may vary depending on the degree of damage to the side surfaces of the vertically stacked structure and the spacing between opposing side surfaces of the vertically stacked structure. Each of the first insulating layer 150 and the second insulating layer 160 may be formed by at least one method selected from sputtering deposition, atomic layer deposition (ALD), chemical vapor deposition (CVD), physical vapor deposition (PVD), plasma-enhanced atomic layer deposition (PEALD), plasma-enhanced chemical vapor deposition (PECVD), and combinations thereof.

[0124] The first electrode 170 can be electrically connected to the second semiconductor layer 130, and the second electrode 180 can be electrically connected to the first semiconductor layer 110. Because a driving voltage can be applied between the first electrode 170 and the second electrode 180, light can be emitted from the active layer 120 of the light-emitting diode 100. The first electrode 170 and the second electrode 180 can be insulated from each other. The first electrode 170 can be the anode of the light-emitting diode 100, and the second electrode 180 can be the cathode of the light-emitting diode 100, and vice versa.

[0125] Reference Figure 13 The foregoing figures describe examples of equivalent circuitry for pixels included in a display device according to an embodiment.

[0126] Figure 13 This is a schematic diagram of the equivalent circuit of a pixel in a display device according to an embodiment.

[0127] Reference Figure 13 A pixel PX may include a pixel circuit section PXC and a light-emitting element LD.

[0128] The pixel circuit section PXC can be connected to scan lines SL1, SL2, and SL3, as well as the data line DL. A first scan signal GW can be applied to the first scan line SL1, a second scan signal GC can be applied to the second scan line SL2, and a third scan signal GI can be applied to the third scan line SL3. The data signal (or data voltage) DS can be applied to the data line DL.

[0129] The pixel circuit portion PXC may include transistors and at least one capacitor. According to an embodiment, the transistors may include a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, and a seventh transistor T7, and the at least one capacitor may include a storage capacitor CST.

[0130] The first electrode of the first transistor T1 can be connected to the first node N1, and the second electrode of the first transistor T1 can be connected to the second node N2. The gate electrode of the first transistor T1 can be connected to the third node N3. The first transistor T1 can generate a drive current DC based on the voltage between the third node N3 and the first node N1. The first transistor T1 can be referred to as a drive transistor.

[0131] The first electrode of the second transistor T2 can be connected to the data line DL, and the second electrode of the second transistor T2 can be connected to the first node N1. The gate electrode of the second transistor T2 can be connected to the first scan line SL1, which transmits the first scan signal GW. The second transistor T2 can write the data signal DS into the first node N1 in response to the first scan signal GW.

[0132] The first electrode of the third transistor T3 can be connected to the second node N2, and the second electrode of the third transistor T3 can be connected to the third node N3. The gate electrode of the third transistor T3 can be connected to the second scan line SL2 that transmits the second scan signal GC. The third transistor T3 can electrically connect the second electrode and the gate electrode of the first transistor T1 in response to the second scan signal GC.

[0133] The first electrode of the fourth transistor T4 can be connected to the first initialization voltage line that transmits the first initialization voltage VINT, and the second electrode of the fourth transistor T4 can be connected to the third node N3. The gate electrode of the fourth transistor T4 can be connected to the third scan line SL3 that transmits the third scan signal GI. The fourth transistor T4 can initialize the third node N3 with the first initialization voltage VINT in response to the third scan signal GI.

[0134] The first electrode of the fifth transistor T5 can be connected to the drive voltage line that transmits the drive voltage ELVDD, and the second electrode of the fifth transistor T5 can be connected to the first node N1. The gate electrode of the fifth transistor T5 can be connected to the light emission control line that transmits the light emission control signal EM. The fifth transistor T5 can electrically connect the drive voltage line and the first node N1 in response to the light emission control signal EM.

[0135] The first electrode of the sixth transistor T6 can be connected to the second node N2, and the second electrode of the sixth transistor T6 can be connected to the fourth node N4. The gate electrode of the sixth transistor T6 can be connected to the light-emitting control line. The sixth transistor T6 can electrically connect the second node N2 and the fourth node N4 in response to the light-emitting control signal EM.

[0136] The first electrode of the seventh transistor T7 can be connected to the second initialization voltage line that transmits the second initialization voltage VAINT, and the second electrode of the seventh transistor T7 can be connected to the fourth node N4. The gate electrode of the seventh transistor T7 can be connected to the scan line that transmits the scan signal GB. The scan line that transmits the scan signal GB can be the third scan line SL3 of the previous stage, and the scan signal GB can be the third scan signal GI of the previous stage. The seventh transistor T7 can initialize the fourth node N4 with the second initialization voltage VAINT in response to the scan signal GB.

[0137] The first electrode of the storage capacitor CST can be connected to the third node N3, and the second electrode of the storage capacitor CST can be connected to the drive voltage line. The storage capacitor CST can store the voltage of the third node N3.

[0138] The first electrode of the light-emitting element (LD) can be connected to the fourth node N4, and the second electrode of the LD can be connected to the common voltage line transmitting the common voltage ELVSS. The LD can emit light based on a drive current DC. The LD can emit light with a brightness corresponding to the drive current DC. According to the embodiment described above, the LD may include at least one light-emitting diode (LED).

[0139] The structure of the pixel circuit portion PXC according to the embodiment is not limited to this, and the number and connection relationship of transistors and capacitors can be changed differently.

[0140] Reference Figure 14 The accompanying drawings described above illustrate the light-emitting diode unit included in the display device according to the embodiment.

[0141] Figure 14 This is a schematic perspective view of the light-emitting diode unit of a display device according to an embodiment.

[0142] According to the embodiment, the light-emitting diode unit 100UN can be the light-emitting diode units 100Ur, 100Ug, and 100Ub described above (see...). Figure 2 , Figure 9 , Figure 10 and Figure 11 Any one of them. Figure 14 The light-emitting diode unit 100UN is shown. Figure 9 The example shown includes a third light-emitting diode 102b and a driving circuit section 700. The light-emitting diode unit 100Ub can be implemented as a single chip of the light-emitting diode unit 100UN.

[0143] The driving circuit section 700 may include the pixel circuit section PXC described above (see above). Figure 13 The driving circuit section 700 may include a plurality of pixel circuit sections PXC, each electrically connected to at least one first electrode of a plurality of light-emitting diodes (e.g., a first light-emitting diode, a second light-emitting diode, and a third light-emitting diode). However, conversely, the number of pixel circuit sections PXC included in the driving circuit section 700 and the number of light-emitting diodes included in a light-emitting diode unit 100UN may be different from each other.

[0144] Reference Figure 15 The accompanying drawings described above illustrate a display device according to an embodiment.

[0145] Figure 15 This is a schematic cross-sectional view of a display device according to an embodiment.

[0146] Reference Figure 15The display device according to an embodiment may include a substrate SUB, and at least one conductive layer CONL and at least one insulating film INS may be stacked on or over the substrate SUB. The at least one conductive layer CONL and at least one insulating film INS may be patterned such that at least a portion thereof can be removed. For example, the conductive layer CONL may be patterned to include conductors CON1, CON2, CON3, and CON4.

[0147] Pad electrodes PD1, PD2, PD3, and PD4 may be disposed above or on at least one conductive layer CONL and at least one insulating film INS. Pad electrodes PD1, PD2, PD3, and PD4 may each be electrically connected to conductors CON1, CON2, CON3, and CON4 of the conductive layer CONL through openings in the insulating film INS.

[0148] The light-emitting diode unit 100UNa can be mounted above the pad electrodes PD1, PD2, PD3, and PD4. The light-emitting diode unit 100UNa can be one of the light-emitting diode units 100Ur, 100Ug, 100Ub, and 100UN according to the embodiments described above (see...). Figure 2 , Figure 9 , Figure 10 , Figure 11 and Figure 14 Each of the following. The light-emitting diode unit 100UNa may include at least one light-emitting diode and a driving circuit section 700. The driving circuit section 700 may be electrically connected to each of the pad electrodes PD1, PD2, PD3, and PD4 to receive the signals and voltages required to drive the light-emitting diode. The driving circuit section 700 may include the pixel circuit section PXC described above (see [link to pixel circuit section]). Figure 13 ).

[0149] Reference Figure 16 The accompanying drawings described above illustrate a display device according to an embodiment.

[0150] Figure 16 This is a schematic cross-sectional view of a display device according to an embodiment.

[0151] Reference Figure 16 The display device according to an embodiment may include a substrate SUB, and a barrier film BR may be disposed on the substrate SUB. The substrate SUB may be made of an insulating material (such as a polymer resin). The barrier film BR may protect the upper layer from moisture that permeates through the substrate SUB. The barrier film BR may include alternately stacked inorganic films.

[0152] The first transistor TFT1 can be disposed on the barrier film BR. Figure 13The sixth transistor T6 shown is the same as the seventh transistor T7, and the first transistor TFT1 can be a transistor connected to the fourth node N4.

[0153] The first transistor TFT1 may include a first active layer ACT1 and a first gate electrode G1 disposed on a barrier film BR. The first active layer ACT1 may include one of polycrystalline silicon, monocrystalline silicon, low-temperature polycrystalline silicon, and amorphous silicon. The first active layer ACT1 may include a first channel region CHA1, a first source region S1, and a first drain region D1. The first channel region CHA1 may be a region overlapping the first gate electrode G1 on a third-direction DR3. Each of the first source region S1 and the first drain region D1 may be a region in which ions are doped into a semiconductor material to provide conductivity.

[0154] A first insulating film INS1 can be disposed on a first active layer ACT1. A first conductive layer including a first gate electrode G1 and a first capacitor electrode CAE1 can be disposed on the first insulating film INS1.

[0155] The second insulating film INS2 can be disposed on the first conductive layer. The second conductive layer, including the second capacitor electrode CAE2, can be disposed on the second insulating film INS2. The second capacitor electrode CAE2 can overlap with the first capacitor electrode CAE1 on the third-direction DR3 to form a capacitor (e.g., Figure 13 The storage capacitor CST shown in the figure.

[0156] The third insulating film INS3 can be disposed on the second conductive layer. The second transistor TFT2 can be disposed on the third insulating film INS3. The second transistor TFT2 can be... Figure 13 One of the fourth transistor T4 and the third transistor T3 shown.

[0157] The second transistor TFT2 may include a second active layer ACT2 and a second gate electrode G2. The second active layer ACT2 may include an oxide semiconductor such as IGZO, IGZTO, or IGTO. The second active layer ACT2 may include a second channel region CHA2, a second source region S2, and a second drain region D2. The second channel region CHA2 may be a region overlapping the second gate electrode G2 on a third-direction DR3. Each of the second source region S2 and the second drain region D2 may be a region in which ions are doped into the oxide semiconductor to provide conductivity.

[0158] The fourth insulating film INS4 can be disposed on the second active layer ACT2. The third conductive layer, including the second gate electrode G2, can be disposed on the fourth insulating film INS4.

[0159] A fifth insulating film INS5 can be disposed on the third conductive layer. A fourth conductive layer, including connecting electrodes BE1, BE2, and PCE1, can be disposed on the fifth insulating film INS5. Connecting electrode PCE1 can be connected to the first drain region D1 of the first active layer ACT1 through an opening PCT1 in each of the insulating films INS1, INS2, INS3, INS4, and INS5. Connecting electrode BE1 can be connected to the second source region S2 of the second active layer ACT2 through an opening BCT1 in each of the insulating films INS4 and INS5. Connecting electrode BE2 can be connected to the second drain region D2 of the second active layer ACT2 through an opening BCT2 in each of the insulating films INS4 and INS5.

[0160] At least one of the first insulating film INS1, the second insulating film INS2, the third insulating film INS3, the fourth insulating film INS4, and the fifth insulating film INS5 may include inorganic insulating materials, such as silicon oxide, silicon nitride, silicon oxynitride, or aluminum oxide.

[0161] The sixth insulating film INS6 can be disposed on the fourth conductive layer. The sixth insulating film INS6 may include organic insulating materials, such as acrylic resin, epoxy resin, phenolic resin, polyamide resin, or polyimide resin.

[0162] A fifth conductive layer, including at least one pad electrode PCE2, may be disposed on a sixth insulating film INS6. The pad electrode PCE2 can be connected to the connecting electrode PCE1 through an opening PCT2 in the sixth insulating film INS6.

[0163] At least one of the first conductive layer, the second conductive layer, the third conductive layer, the fourth conductive layer, and the fifth conductive layer may be formed as a single layer or multiple layers of at least one metal including molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), or copper (Cu).

[0164] The LED unit 100UNb can be mounted on the pad electrode PCE2. The LED unit 100UNb can be one of the LED units 100Ur, 100Ug, 100Ub, and 100UN according to the embodiments described above (see...). Figure 2 , Figure 9 , Figure 10 , Figure 11 and Figure 14Each of the above. The light-emitting diode unit 100UNb may include at least one light-emitting diode and a driving circuit section 700. The driving circuit section 700 may be electrically connected to at least one pad electrode PCE2 to receive signals and voltages required to drive the light-emitting diode. Transistors including a first transistor TFT1 and a second transistor TFT2 formed on the substrate SUB, as well as capacitors, may form the pixel circuit section PXC described above (see [link to documentation]). Figure 13 The light-emitting diode of the light-emitting diode unit 100UNb can receive the voltage to be applied to the anode through the pad electrode PCE2.

[0165] Reference Figure 17 The accompanying drawings described above illustrate a display device according to an embodiment.

[0166] Figure 17 This is a schematic cross-sectional view of a display device according to an embodiment.

[0167] The display device according to the embodiment may include a substrate SUB, and each of the light-emitting diodes 100r, 100g, and 100b may be disposed on the substrate SUB. Light-emitting diode 100g may be associated with the second light-emitting diodes 101g, 102g, 103g, and 104g described above (see [link to documentation]). Figure 2 , Figure 9 , Figure 10 and Figure 11 Each of these is identical and can emit green light. LED 100b can be the same as the third LEDs 101b, 102b, 103b, and 104b described above (see [link to documentation]). Figure 2 , Figure 9 , Figure 10 and Figure 11 Each of these is identical and can emit blue light. LED 100r can be the same as the first LEDs 101r, 102r, 103r, and 104r described above (see...). Figure 2 , Figure 9 , Figure 10 and Figure 11 Each of them is identical and can emit red light.

[0168] The protective layer 230 may be disposed on each of the light-emitting diodes 100r, 100g, and 100b. The protective layer 230 may comprise at least one of inorganic and organic materials, such as silicon oxide or silicon nitride.

[0169] The color conversion layer QDL and the transmission layers TPLg and TPLb can be disposed on the protective layer 230.

[0170] Transmissive layers TPLg and TPLb can be disposed above light-emitting diodes 100g and 100b, overlapping each other on the third-direction DR3, and allowing light incident from light-emitting diodes 100g and 100b to pass through. Transmissive layers TPLg and TPLb may comprise polymer materials. In another example, transmissive layers TPLg and TPLb may be omitted.

[0171] The color conversion layer QDL can be configured to overlap with the light-emitting diode 100r on a third-direction DR3. The color conversion layer QDL can include semiconductor nanocrystals. The semiconductor nanocrystals can include quantum dots 3R that convert incident light (e.g., blue light) into light of another color (e.g., red light). The quantum dots 3R can include II-VI compounds, III-V compounds, IV-VI compounds, group IV elements or compounds, I-III-VI compounds, II-III-VI compounds, I-II-IV-VI compounds, or combinations thereof. The quantum dots 3R may not include cadmium. According to an embodiment, the quantum dots 3R can have a core-shell structure, comprising a core containing the semiconductor nanocrystals described above and a shell surrounding the core. The shell of the quantum dots 3R can serve as a protective layer for maintaining semiconductor properties by preventing chemical denaturation of the core and / or as a charging layer for imparting electrophoretic properties to the quantum dots 3R. The shell can be single-layered or multi-layered. The interface between the core and the shell can have a concentration gradient in which the concentration of elements present in the shell decreases toward the center of the shell. For example, the shell of quantum dot 3R may include metal oxides, non-metal oxides, semiconductor compounds, or combinations thereof. Quantum dot 3R can emit light converted into red light, and for example, the maximum emission peak wavelength of quantum dot 3R may be approximately 600 nm or greater, approximately 610 nm or greater, approximately 615 nm or greater, or approximately 620 nm or greater and approximately 650 nm or less, approximately 645 nm or less, approximately 640 nm or less, approximately 635 nm or less, or approximately 630 nm or less.

[0172] The partition wall 240 can be disposed between each of the adjacent color conversion layer QDL and the transmission layers TPLg and TPLb.

[0173] The outer coating 260 can be applied to each of the color conversion layer QDL and the transmission layers TPLg and TPLb. In another example, the outer coating 260 can be omitted.

[0174] An insulating layer 270 can be disposed on an outer coating layer 260 and a partition wall 240, and color filters 310R, 310G, and 310B, as well as a light-blocking member 320, can be disposed on the insulating layer 270. Color filter 310R can display red light, color filter 310G can display green light, and color filter 310B can display blue light.

[0175] The substrate or insulating layer 330 may be disposed on the color filters 310R, 310G and 310B and the light blocking member 320.

[0176] Reference Figures 18 to 21 The accompanying drawings described above illustrate various electronic devices used in the display device according to the embodiments.

[0177] Figure 18 An example of a display device according to an embodiment being applied to a mobile device is shown. Figure 19 An example of a display device according to an embodiment being applied to a display device for a vehicle is shown. Figure 20 Examples of display devices according to embodiments applied to augmented reality glasses or virtual reality glasses are shown, and Figure 21 An example of a display device according to an embodiment being applied to a wearable display device is shown.

[0178] Reference Figure 18 The electronic device according to the embodiment may be a mobile device 1000 and may include a display device 1100. The display device 1100 may have a structure in which at least a portion of the display device 1100 can be folded, and for example, the display device 1100 may be implemented as a multi-foldable display device. For example, the display device 1100 may be implemented as a rollable display device, a bendable display device, or a stretchable display device, etc. The display device 1100 may be a display device 300 according to the embodiment described above (see...). Figure 1 ).

[0179] Reference Figure 19 For example, the electronic device according to the embodiment may include a head-up display device for a vehicle. The head-up display device may include a display device 1250 provided in a region of the vehicle, and at least one light path changing member 1200 that changes the path of light so that the driver of the vehicle can see an image generated by the display device 1250. The display device 1250 may be a display device 300 according to the embodiment described above (see...). Figure 1 ).

[0180] Reference Figure 20 The electronic device according to the embodiment may be augmented reality glasses or virtual reality glasses 1300, and may include a projection system 1310 for forming an image and at least one component 1350 for guiding the image from the projection system 1310 into the user's eyes. The projection system 1310 may be a display device 300 according to the embodiment described above (see...). Figure 1 ).

[0181] Reference Figure 21The electronic device according to the embodiment may be a wearable device 1400, and may include a display device 300 according to the embodiment described above (see Figure 1 ).

[0182] In summarizing the detailed description, those skilled in the art will appreciate that many variations and modifications can be made to the embodiments without substantially departing from the principles, spirit, and scope of this disclosure. Therefore, the disclosed embodiments are for general and descriptive purposes only and are not intended to be limiting.

Claims

1. A display device, wherein, The display device includes: Base; and A first light-emitting diode unit, a second light-emitting diode unit, and a third light-emitting diode unit are disposed above the substrate, wherein... The first light-emitting diode unit includes at least one first light-emitting diode that emits light of a first color. The second light-emitting diode unit includes at least one second light-emitting diode that emits a second color light different from the first color light. The third light-emitting diode unit includes at least one third light-emitting diode that emits a third color light different from the first color light and the second color light, and The planar dimension of the at least one third light-emitting diode is larger than the planar dimension of the at least one first light-emitting diode and the planar dimension of the at least one second light-emitting diode.

2. The display device according to claim 1, wherein, The shortest width of the at least one third light-emitting diode in the plan view is greater than the shortest width of the at least one first light-emitting diode in the plan view and the shortest width of the at least one second light-emitting diode in the plan view.

3. The display device according to claim 2, wherein, The shortest width of the at least one third light-emitting diode is greater than or equal to the reference dimension, and At least one of the shortest width of the at least one first light-emitting diode and the shortest width of the at least one second light-emitting diode is smaller than the reference dimension.

4. The display device according to claim 3, wherein, The reference size is in the range of 3 to 5 micrometers.

5. The display device according to claim 4, wherein, The shortest width of the at least one third light-emitting diode is less than 10 micrometers.

6. The display device according to claim 5, wherein, The number of at least one first light-emitting diode included in the first light-emitting diode unit and the number of at least one second light-emitting diode included in the second light-emitting diode unit are greater than the number of at least one third light-emitting diode included in the third light-emitting diode unit.

7. The display device according to claim 1, wherein, The display device further includes: The driving circuit is disposed between the substrate and each of the first light-emitting diode unit, the second light-emitting diode unit, and the third light-emitting diode unit.

8. The display device according to claim 7, wherein, The display device further includes: The pixel circuit section is electrically connected to at least one first electrode of the at least one first light-emitting diode, the at least one second light-emitting diode, and the at least one third light-emitting diode. The pixel circuit section includes multiple transistors.

9. The display device according to claim 8, wherein, The driving circuit section includes the pixel circuit section.

10. The display device according to claim 8, wherein, The pixel circuit portion is disposed between the substrate and the driving circuit portion.

11. The display device according to claim 1, wherein, The planar shape of at least one of the at least one first light-emitting diode, the at least one second light-emitting diode, and the at least one third light-emitting diode is circular or rectangular.

12. A display device, wherein, The display device includes: Base; and A first light-emitting diode unit and a second light-emitting diode unit are disposed above the substrate, wherein... The first light-emitting diode unit includes at least one green light-emitting diode. The second light-emitting diode unit includes at least one blue light-emitting diode. The shortest width of the at least one second light-emitting diode in the plan view is 3 micrometers or greater, and The shortest width of the at least one first light-emitting diode in the plan view is less than 3 micrometers.

13. The display device according to claim 12, wherein, The shortest width of the at least one first light-emitting diode is less than 10 micrometers.

14. The display device according to claim 13, wherein, The number of at least one first light-emitting diode included in the first light-emitting diode unit is greater than the number of at least one second light-emitting diode included in the second light-emitting diode unit.

15. The display device according to claim 12, wherein, The display device further includes: The driving circuit is disposed between the substrate and each of the first and second light-emitting diode units.

16. The display device according to claim 15, wherein, The display device further includes: The pixel circuit section is electrically connected to at least one first electrode of the at least one first light-emitting diode and the at least one second light-emitting diode. The pixel circuit section includes multiple transistors.

17. The display device according to claim 16, wherein, The driving circuit section includes the pixel circuit section.

18. The display device according to claim 16, wherein, The pixel circuit portion is disposed between the substrate and the driving circuit portion.

19. An electronic device, wherein, The electronic device includes: Base; and A first light-emitting diode unit, a second light-emitting diode unit, and a third light-emitting diode unit are disposed above the substrate, wherein... The first light-emitting diode unit includes at least one first light-emitting diode that emits light of a first color. The second light-emitting diode unit includes at least one second light-emitting diode that emits a second color light different from the first color light. The third light-emitting diode unit includes at least one third light-emitting diode that emits a third color light different from the first color light and the second color light, and The planar dimension of the at least one third light-emitting diode is larger than the planar dimension of the at least one first light-emitting diode and the planar dimension of the at least one second light-emitting diode.

20. The electronic device according to claim 19, wherein, The shortest width of the at least one third light-emitting diode in the plan view is greater than the shortest width of the at least one first light-emitting diode in the plan view and the shortest width of the at least one second light-emitting diode in the plan view.

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