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EP-4125142-B1 - DISPLAY APPARATUS

EP4125142B1EP 4125142 B1EP4125142 B1EP 4125142B1EP-4125142-B1

Inventors

  • KIM, WOONGSIK
  • HONG, JONGBEOM
  • KIM, JEONGWON
  • BYUN, JINSU

Dates

Publication Date
20260513
Application Date
20220726

Claims (12)

  1. A display apparatus (1) comprising: a display substrate (100); a plurality of display elements provided on the display substrate (100) and configured to emit light; an encapsulation substrate (300) provided on the plurality of display elements to face the display substrate (100); a refractive layer (530) provided on a lower surface of or below the encapsulation substrate (300), the refractive layer (530) comprising a first insulating layer (531) having a first refractive index and a second insulating layer (533, 533') having a second refractive index greater than the first refractive index; and a light blocking layer (510) provided on a lower surface of or below the refractive layer (530), wherein the first insulating layer (531) and the light blocking layer (510) are arranged to correspond to non-emission areas (NEA) between the plurality of display elements, and the second insulating layer (533, 533') is arranged to correspond to emission areas (EA) of the plurality of display elements, and a width (W3u) of an upper surface of the second insulating layer (533, 533') in the emission areas (EA) is less than a width (W3d) of a lower surface of the second insulating layer (533, 533'), and the first insulating layer (531) and the second insulating layer (533, 533') being in direct contact with the encapsulation substrate (300); further comprising an upper light blocking layer (520) provided between the encapsulation substrate (300) and the first insulating layer (531); wherein the upper light blocking layer (520) comprises a first opening (520_OP) corresponding to the emission area (EA), the light blocking layer (510) comprises a second opening (510_OP) corresponding to the emission area (EA), and a width (W4) of the first opening (520_OP) is less than a width (W2) of the second opening (510_OP).
  2. The display apparatus (1) of claim 1, wherein an angle (θ) at which a side surface of the second insulating layer (533, 533') is inclined with respect to a lower surface of the encapsulation substrate (300) is about 50° to about 60°.
  3. The display apparatus (1) of claim 1 or 2, wherein the first refractive index is about 1.45 to about 1.55, and the second refractive index is about 1.55 to about 1.7.
  4. The display apparatus (1) of at least one of claims 1 to 3, wherein the second insulating layer (533, 533') comprises a color filter (CF1, CF2, CF3).
  5. The display apparatus (1) of at least one of claims 1 to 4, wherein the second insulating layer (533, 533') comprises a reflection control layer configured to selectively absorb a first wavelength band and a second wavelength band of a visible light band.
  6. The display apparatus (1) of claim 5, wherein the first wavelength band is 480 nm to 505 nm, and the second wavelength band is 585 nm to 605 nm.
  7. The display apparatus (1) of at least one of claims 1 to 6, wherein the width (W2) of a respective opening (510_OP) of the light blocking layer (510) is greater than the width (W3u) of the upper surface of the second insulating layer (533, 533').
  8. The display apparatus (1) of at least one of claims 1 to 7, wherein a thickness (t1) of the light blocking layer (510) is less than a thickness (t2) of the first insulating layer (531).
  9. The display apparatus (1) according to at least one of claims 1 to 8, comprising: a first display element, a second display element, and a third display element, which are on the display substrate (100) and are configured to emit light of different colors; the encapsulation substrate (300) is provided on the first display element, the second display element, and the third display element to face the display substrate (100); the openings (510_OP) of the light blocking layer (510) correspond to emission areas (EA) of the first display element, the second display element, and the third display element; and wherein the second insulating layer (533') is arranged to correspond to the emission areas (EA) of the first display element, the second display element, and the third display element.
  10. The display apparatus (1) of claim 9, wherein the second insulating layer (533') comprises a first color filter (CF1), a second color filter (CF2), and a third color filter (CF3) configured to emit different colors from each other, and the first color filter (CF1), the second color filter (CF2), and the third color filter (CF3) are arranged to correspond to the first display element, the second display element, and the third display element, respectively.
  11. The display apparatus (1) of claims 9 or 10, wherein the second insulating layer (533') is provided as one common part on the first display element, the second display element, and the third display element.
  12. The display apparatus (1) of at least one of claims 9 to 11, wherein the second insulating layer (533') extends between the first, second, and third display elements and the light blocking layer (510).

Description

BACKGROUND FIELD The present invention relates to a display apparatus. DISCUSSION OF THE BACKGROUND Recently, the usage of display apparatuses has diversified. Also, display apparatuses have become thinner and more lightweight, and thus the use of display apparatuses has expanded. As display apparatuses are used in various fields, the demand for display apparatuses that provide high-quality images is increasing. US 2019/221779 A1 discloses a display device including: a display portion including pixels defined by a pixel defining layer; and a touch portion on the display portion. The touch portion includes: a first touch electrode overlapping the pixel defining layer; a first organic layer on the first touch electrode; a second touch electrode contacting the first touch electrode; a second organic layer on the second touch electrode; and a high refractive index layer on the first organic layer, the second touch electrode, and the second organic layer. The high refractive index layer is disposed between adjacent second touch electrodes in a plan view and includes a first convex surface protruding toward the display portion and overlapping one of the pixels. KR 2020 0083875 A discloses a display device comprising: a first substrate including a plurality of pixels; a second substrate facing the first substrate; and an optical path change layer disposed between the first substrate and the second substrate and including a first pattern portion and a second pattern portion. The first pattern portion has a first refractive index and the second pattern portion has a second refractive index smaller than the first refractive index. The first pattern portion includes a blue colorant. US 2019/221778 A1 discloses an organic light-emitting display device including a substrate; a first organic light-emitting layer disposed on the substrate; a pixel defining film disposed on the first organic light-emitting layer and having a first opening, which at least partially exposes the first organic light-emitting layer; and an optical path converter disposed on the pixel defining film to overlap with the first organic light-emitting layer and including a first optical path converting member, which has a first refractive index, and a second optical path converting member, which has a second refractive index that is lower than the first refractive index. The above information disclosed in this Background section is only for understanding of the background of the inventive concepts, and, therefore, it may contain information that does not constitute prior art. SUMMARY Devices constructed according to the invention are capable of improved light extraction efficiency and visibility by providing a refractive layer and a light blocking layer on a lower surface of an encapsulation substrate. Inventive concepts consistent with one or more embodiments provide for a display apparatus in which light efficiency and visibility are improved to allow high-quality images to be provided. However, this is merely an example, and the scope of the disclosure is not limited thereby. The present invention is defined by a display apparatus with the features of claim 1. The dependent claims describe preferred embodiments. Additional features of the inventive concepts will be set forth in the description that follows, and in part will be apparent from the description, or may be learned by practice of the inventive concepts. When used herein, the term width refers to the width in a cross-sectional view through the display substrate and the encapsulation substrate and the parts between these substrates. The cross-sectional view is in a plane extending in the thickness direction (z direction) of the display apparatus and in the extending direction of the substrates, e.g. the extending direction through the emission areas and the non-emission areas. In some embodiments, an angle at which a side surface of the second insulating layer is inclined with respect to a lower surface of the encapsulation substrate may be about 50° to about 60°. In some embodiments, the first refractive index may be about 1.45 to about 1.55, and the second refractive index is about 1.55 to about 1.7. In some embodiments, the second insulating layer may include a color filter. In some embodiments, the second insulating layer may include a reflection control layer configured to selectively absorb a first wavelength band and a second wavelength band of a visible light band. In some embodiments, the first wavelength band may be about 480 nm to about 505 nm, and the second wavelength band may be about 585 nm to about 605 nm. In some embodiments, the width of a respective opening of the light blocking layer may be greater than the width of the upper surface of the second insulating layer. In some embodiments, a thickness of the light blocking layer may be less than a thickness of the first insulating layer. According to an embodiment of the present invention, a display apparatus includes a dis