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JP-7855216-B2 - display device

JP7855216B2JP 7855216 B2JP7855216 B2JP 7855216B2JP-7855216-B2

Inventors

  • 田畠 弘志

Assignees

  • 株式会社Magnolia White

Dates

Publication Date
20260508
Application Date
20220106

Claims (17)

  1. circuit board and A pixel circuit arranged above the aforementioned substrate, An insulating layer covering the aforementioned pixel circuit and having contact holes, A lower electrode is positioned above the insulating layer and connected to the pixel circuit through the contact hole, An upper electrode facing the lower electrode, An organic layer located between the lower electrode and the upper electrode, which emits light in accordance with the potential difference between the lower electrode and the upper electrode, A rib made of an inorganic material, having an opening that overlaps with the lower electrode, A partition wall positioned above the rib, The system comprises a filler material disposed inside the contact hole, The organic layer includes a first organic layer that contacts the lower electrode through the opening, and a second organic layer located above the partition wall and spaced apart from the first organic layer. The partition wall and the rib overlap with at least a portion of the contact hole and the filler in a plan view. The aforementioned lower electrode is A conductive underlayer covering the insulating layer, A first transparent conductive layer formed of a transparent conductive material and covering the underlying layer, A metal layer formed of a metal material and covering the first transparent conductive layer, A second transparent conductive layer, formed of a transparent conductive material and covering the metal layer, Includes, The aforementioned underlayer is connected to the pixel circuit through the contact hole, At least a portion of the filler is located between the base layer and the first transparent conductive layer . The lower electrode has a first side located between the contact hole and the opening in a plan view, and a protrusion that extends from the first side and overlaps with the contact hole in a plan view. Display device.
  2. circuit board and A pixel circuit arranged above the aforementioned substrate, An insulating layer covering the aforementioned pixel circuit and having contact holes, A lower electrode is positioned above the insulating layer and connected to the pixel circuit through the contact hole, An upper electrode facing the lower electrode, An organic layer located between the lower electrode and the upper electrode, which emits light in accordance with the potential difference between the lower electrode and the upper electrode, A rib made of an inorganic material, having an opening that overlaps with the lower electrode, A partition wall positioned above the rib, The system comprises a filler material disposed inside the contact hole, The organic layer includes a first organic layer that contacts the lower electrode through the opening, and a second organic layer located above the partition wall and spaced apart from the first organic layer. The partition wall and the rib overlap with at least a portion of the contact hole and the filler in a plan view. The aforementioned lower electrode is A first transparent conductive layer formed of a transparent conductive material and covering the insulating layer, A metal layer formed of a metal material and covering the first transparent conductive layer, A second transparent conductive layer, formed of a transparent conductive material and covering the metal layer, Includes, The first transparent conductive layer is connected to the pixel circuit through the contact hole, At least a portion of the filler is located between the first transparent conductive layer and the metal layer. Display device.
  3. circuit board and A pixel circuit arranged above the aforementioned substrate, An insulating layer covering the aforementioned pixel circuit and having contact holes, A lower electrode is positioned above the insulating layer and connected to the pixel circuit through the contact hole, An upper electrode facing the lower electrode, An organic layer located between the lower electrode and the upper electrode, which emits light in accordance with the potential difference between the lower electrode and the upper electrode, A rib made of an inorganic material, having an opening that overlaps with the lower electrode, A partition wall positioned above the rib, The system comprises a filler material disposed inside the contact hole, The organic layer includes a first organic layer that contacts the lower electrode through the opening, and a second organic layer located above the partition wall and spaced apart from the first organic layer. The partition wall and the rib overlap with at least a portion of the contact hole and the filler in a plan view. The partition wall includes a lower portion positioned on the rib and an upper portion positioned on the lower portion and having an end portion that protrudes from the side surface of the lower portion. The second organic layer is positioned on top of the upper part, The upper electrode includes a first upper electrode covering the first organic layer and a second upper electrode covering the second organic layer and spaced apart from the first upper electrode. The first upper electrode is in contact with the side surface , The lower part is conductive. Display device.
  4. The aforementioned lower side surface overlaps with the contact hole in a plan view. The display device according to claim 3.
  5. It is formed of an inorganic material and further comprises a sealing layer that covers the first upper electrode, the side surface, and the second upper electrode. The display device according to claim 3 or 4 .
  6. The lower electrode has a first side located between the contact hole and the opening in a plan view, and a protrusion that extends from the first side and overlaps with the contact hole in a plan view. The display device according to any one of claims 2 to 5 .
  7. The aforementioned partition wall surrounds the opening in a plan view. The display device according to any one of claims 1 to 6 .
  8. The second organic layer surrounds the opening in a plan view. The display device according to any one of claims 1 to 7 .
  9. The second organic layer overlaps the contact hole in a plan view. The display device according to any one of claims 1 to 8 .
  10. The thickness of the rib is smaller than the thickness of the partition wall. The display device according to any one of claims 1 to 9 .
  11. circuit board and A pixel circuit arranged above the aforementioned substrate, An insulating layer covering the aforementioned pixel circuit and having contact holes, A lower electrode is positioned above the insulating layer and connected to the pixel circuit through the contact hole, An upper electrode facing the lower electrode, An organic layer located between the lower electrode and the upper electrode, which emits light in accordance with the potential difference between the lower electrode and the upper electrode, A rib made of an inorganic material, having an opening that overlaps with the lower electrode, A partition wall positioned above the rib, The system comprises a filler material disposed inside the contact hole, The organic layer includes a first organic layer that contacts the lower electrode through the opening, and a second organic layer located above the partition wall and spaced apart from the first organic layer. The partition wall and the rib overlap with at least a portion of the contact hole and the filler in a plan view. The device comprises a first sub-pixel, a second sub-pixel, and a third sub-pixel, each including the pixel circuit, the contact hole, the lower electrode, the upper electrode, the organic layer, and the aperture, respectively. The first subpixel and the third subpixel are aligned in the first direction. The first subpixel and the second subpixel are aligned in a second direction intersecting the first direction. The partition wall comprises a first partition wall positioned between the opening of the first sub-pixel and the opening of the second sub-pixel, and a second partition wall positioned between the opening of the first sub-pixel and the opening of the third sub-pixel. Display device.
  12. The width of the first partition in the second direction is greater than the width of the second partition in the first direction. The display device according to claim 11 .
  13. The contact hole of the first subpixel overlaps with the first partition in a plan view. The display device according to claim 11 or 12 .
  14. The contact hole of the second subpixel overlaps with the first partition in a plan view and is aligned with the contact hole of the first subpixel in the first direction. The display device according to claim 13 .
  15. The second organic layer of the first subpixel and the second organic layer of the second subpixel are located on the first partition and are spaced apart in the second direction. The display device according to any one of claims 11 to 14 .
  16. At least a portion of the filler is located between the lower electrode and the rib in the thickness direction of the insulating layer. The display device according to claim 3 or 11 .
  17. At least a portion of the filler is located between the rib and the partition wall in the thickness direction of the insulating layer. The display device according to claim 3 or 11 .

Description

Embodiments of the present invention relate to a display device. In recent years, display devices using organic light-emitting diodes (OLEDs) as display elements have been put into practical use. This display element comprises a pixel circuit including a thin-film transistor, a lower electrode connected to the pixel circuit, an organic layer covering the lower electrode, and an upper electrode covering the organic layer. Generally, pixel circuits are covered by an insulating layer made of organic material, and the lower electrode is connected to the pixel circuit through contact holes provided in this insulating layer. If elements placed on top of the insulating layer are deformed by the contact holes, display defects may occur. Japanese Patent Publication No. 2000-195677Japanese Patent Publication No. 2004-207217Japanese Patent Publication No. 2008-135325Japanese Patent Publication No. 2009-32673Japanese Patent Publication No. 2010-118191International Publication No. 2018/179308 Figure 1 shows an example of the configuration of a display device according to the first embodiment.Figure 2 shows an example of the sub-pixel layout according to the first embodiment.Figure 3 is a schematic cross-sectional view of the display device along the line III-III in Figure 2.Figure 4 is a schematic plan view, an enlarged portion of Figure 2.Figure 5 is a schematic cross-sectional view of the display device along the V-V line in Figure 4.Figure 6 is a schematic cross-sectional view showing a part of the manufacturing process of the display device according to the first embodiment.Figure 7 is a schematic cross-sectional view of a display device according to a comparative example.Figure 8 is a schematic cross-sectional view of the display device according to the second embodiment.Figure 9 is a schematic cross-sectional view of the display device according to the third embodiment.Figure 10 is a schematic cross-sectional view of the display device according to the fourth embodiment. Several embodiments will be described with reference to the drawings. The disclosure is merely an example, and any modifications that a person skilled in the art could easily conceive of while maintaining the spirit of the invention are naturally included within the scope of the present invention. Furthermore, the drawings may schematically represent the width, thickness, shape, etc., of each part in order to clarify the explanation, but these are merely examples and do not limit the interpretation of the present invention. In addition, in this specification and each drawing, the same reference numerals are used for components that perform the same or similar functions as those described above with respect to previously shown drawings, and redundant detailed explanations may be omitted as appropriate. Furthermore, the drawings will include mutually orthogonal X, Y, and Z axes as needed to facilitate understanding. The direction along the X-axis will be referred to as the first direction, the direction along the Y-axis as the second direction, and the direction along the Z-axis as the third direction. Viewing various elements parallel to the third direction (Z) is called a plan view. Each embodiment of the display device is an organic electroluminescent display device equipped with an organic light-emitting diode (OLED) as a display element, and can be mounted in televisions, personal computers, in-vehicle equipment, tablet terminals, smartphones, mobile phone terminals, and the like. [First Embodiment] Figure 1 shows an example configuration of a display device DSP according to the first embodiment. The display device DSP has a display area DA for displaying an image and a peripheral area SA around the display area DA on an insulating substrate 10. The substrate 10 may be glass or a flexible resin film. In this embodiment, the shape of the substrate 10 in plan view is rectangular. However, the shape of the substrate 10 in plan view is not limited to a rectangle; it may be a square, circle, ellipse, or other shape. The display area DA comprises multiple pixels PX arranged in a matrix in the first direction X and the second direction Y. Each pixel PX includes multiple sub-pixels SP. In one example, pixel PX includes a red sub-pixel SP1 (first sub-pixel), a green sub-pixel SP2 (second sub-pixel), and a blue sub-pixel SP3 (third sub-pixel). Note that pixel PX may include sub-pixels SP of other colors, such as white, either together with sub-pixels SP1, SP2, and SP3, or in place of any one of SP1, SP2, or SP3. The sub-pixel SP comprises a pixel circuit 1 and a display element 20 driven by the pixel circuit 1. The pixel circuit 1 includes a pixel switch 2, a drive transistor 3, and a capacitor 4. The pixel switch 2 and the drive transistor 3 are switching elements, for example, thin-film transistors. The gate electrode of the pixel switch 2 is connected to the scan line GL. One of the source and drain electrodes of the pixel switch 2 is connected to the