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EP-4131394-B1 - DISPLAY PANEL AND DISPLAY DEVICE

EP4131394B1EP 4131394 B1EP4131394 B1EP 4131394B1EP-4131394-B1

Inventors

  • YANG, Shengji
  • DONG, XUE
  • CHEN, XIAOCHUAN
  • LU, Pengcheng
  • WANG, HUI
  • WANG, YANMING
  • SONG, Yage
  • LI, Jiantong
  • HUANG, KUANTA

Dates

Publication Date
20260506
Application Date
20200327

Claims (14)

  1. A display panel comprising a display area (A) and a peripheral area (B) surrounding the display area (A), comprising: a driving back plate (100) comprising a driving circuit layer (110) and a first reflecting electrode layer (130) arranged in a stacked manner; the first reflecting electrode layer (130) comprising a plurality of first primary reflecting electrodes (131) in the display area (A) and a plurality of first auxiliary reflecting electrodes (132) in the peripheral area (B); and the plurality of the first primary reflecting electrodes (131) being electrically connected with the driving circuit layer (110); a first insulating layer (200) on a side of the first reflecting electrode layer (130) away from the driving circuit layer (110); a light-emitting device layer on a side of the first insulating layer (200) away from the driving circuit layer (110) and comprising a second reflecting electrode layer (310), an organic light-emitting layer (320) and a common electrode layer (330) sequentially stacked on a side of the first insulating layer (200) away from the driving circuit layer (110); wherein the second reflecting electrode layer (310) comprises a plurality of second primary reflecting electrodes (311) in the display area (A) and a plurality of second auxiliary reflecting electrodes (312) in the peripheral area (B); wherein the plurality of the second primary reflecting electrodes (311) are in one-to-one correspondence with and electrically connected with the first primary reflecting electrodes (131); and wherein the first insulating layer (200) comprises a plurality of connection via holes (202) arranged in one-to-one correspondence with the plurality of first primary reflecting electrodes (131) and the plurality of second primary reflecting electrodes (311), and the first primary reflecting electrodes (131) and the second primary reflecting electrodes (311) are electrically connected in one-to-one correspondence through the connection via holes (202); characterized in that , an orthographic projection of the second primary reflecting electrode (311) on the first reflecting electrode layer (130) is within the first primary reflecting electrode (131); a minimum value of a distance between an edge of the orthographic projection of the second primary reflecting electrode (311) on the first reflecting electrode layer (130) and an edge of the first primary reflecting electrode (131) is a first distance (d1); and a minimum value of a distance between any point of an edge of the second primary reflecting electrode (311) and a center of the second primary reflecting electrode (311) is a first dimension value (S1); wherein the first distance (d1) is within a range of 13%-17% of the first dimension value (S1).
  2. The display panel according to claim 1, wherein the peripheral area (B) comprises a sensing area (C); the plurality of the first auxiliary reflecting electrodes (132) in the sensing area (C) have the same patterns with the first primary reflecting electrodes (131) and are electrically connected with the driving circuit layer (110); the plurality of second auxiliary reflecting electrodes (312) in the sensing area (C) have the same patterns with the second primary reflecting electrodes (311) and are electrically connected with the first auxiliary reflecting electrodes (132) in the sensing area (C); wherein the sensing area (C) is covered by the organic light-emitting layer (320) and the common electrode layer.
  3. The display panel according to claim 1, wherein a minimum value of a distance between any point of orthographic projection of the second primary reflecting electrode (311) on the first reflecting electrode layer (130) and any point on an edge of the first primary reflecting electrode (131) is equal to 0.2-0.5 microns.
  4. The display panel according to claim 1, wherein a distance between two adjacent ones of the first primary reflecting electrodes (131) is a second distance (d2); wherein a minimum value of a distance between any point on edge of the first primary reflecting electrode (131) and a center of the first primary reflecting electrode (131) is a second dimension value (S2); wherein the second distance (d2) is within a range of 7%-10% of the second dimension value (S2).
  5. The display panel according to claim 1, wherein a distance between two adjacent ones of the first primary reflecting electrodes (131) is equal to 0.1-0.3 microns.
  6. The display panel according to claim 1, wherein a minimum value of a distance between any point on an edge of the second primary reflecting electrode (311) and a center of the second primary reflecting electrode (311) is a first dimension value (S1); wherein a distance between two adjacent ones of the second primary reflecting electrodes (311) is a third distance (d3); wherein the third distance (d3) is within a range of 30% to 50% of the first dimension value (S1).
  7. The display panel according to claim 1, wherein a distance between two adjacent ones of the second primary reflecting electrodes (311) is equal to 0.6-1.0 microns.
  8. The display panel according to any one of claims 1-7, wherein the second reflecting electrode layer (310) comprises a first titanium metal layer, a first aluminum metal layer, a second titanium metal layer and a molybdenum metal layer sequentially stacked on a surface of the first insulating layer (200) away from the driving circuit layer (110); wherein the first titanium metal layer has a thickness of 80-120 angstroms, the first aluminum metal layer has a thickness of 400-500 angstroms, the second titanium metal layer has a thickness of 40-60 angstroms, and the molybdenum metal layer has a thickness of 40-60 angstroms.
  9. The display panel according to any one of claims 1-7, wherein the first reflecting electrode layer (130) comprises a third titanium metal layer, a second aluminum metal layer and a titanium nitride layer sequentially stacked on a side of the driving circuit layer (110); wherein the third titanium metal layer has a thickness of 80-120 angstroms, the second aluminum metal layer has a thickness of 700-900 angstroms, and the titanium nitride layer has a thickness of 80-120 angstroms.
  10. The display panel according to any one of claims 1-7, wherein an orthographic projection of a center of the second primary reflecting electrode (311) on the first reflecting electrode layer (130) overlaps a center of the first primary reflecting electrode (131).
  11. The display panel according to any one of claims 1-7, wherein the peripheral area (B) comprises a bonding area (D); wherein an auxiliary reflecting electrode in the bonding area (D) is electrically connected with the driving circuit layer (110); wherein the first insulating layer (200) has a bonding hole exposed at least a part of the auxiliary reflecting electrode in the bonding area (D).
  12. The display panel according to any one of claims 1-7, wherein the light-emitting device layer further comprises a pixel definition layer (340); wherein the pixel definition layer (340) is on a surface of the first insulating layer (200) away from the driving back plate (100) and located in a gap between the second primary reflecting electrodes (311); wherein an orthographic projection of the pixel definition layer (340) on the first reflecting electrode layer (130) partially overlaps the first primary reflecting electrode (131).
  13. The display panel according to any one of claims 1-7, wherein a distance between two adjacent ones of the first auxiliary reflecting electrodes (132) is larger than a distance between two adjacent ones of the first primary reflecting electrodes (131); and a distance between two adjacent ones of the second auxiliary reflecting electrodes (312) is larger than a distance between two adjacent ones of the second primary reflecting electrodes (311).
  14. A display device comprising the display panel according to any one of claims 1-13.

Description

TECHNICAL FIELD This disclosure relates to the technical field of display, in particular to a display panel and a display device. BACKGROUND Compared with DMD (digital micro mirror device) and LCOS (liquid crystal on silicon) micro-displays, silicon-based OLED micro-displays possess extremely excellent display characteristics. OLED provides excellent user experience because of high brightness, rich colors, low driving voltage, fast response speed, low power consumption. And, OLED is an all-solid-state device with good anti-seismic performance and wide working temperature range (-40°C~85°C). OLED is of a self-luminous device, does not need a backlight source, has a wide view angle range and a thin thickness to reduce a system volume profitably, and especially adapt to a near-eye display system. In the near-eye display system, the brightness of the display screen is a key indicator. For example, in AR (augmented reality) products, the micro-display may be a high-brightness screen, in order to adjust the brightness thereof according to different work environments and scenes such that the display brightness may be matched with a sensual experience of human eyes. Those contents as disclosed in the Background portion are merely used to reinforce understanding of the background technology of the present disclosure, accordingly the Background portion may include information that does not constitute the related art as already known by an ordinary person skilled in the art. CN 110 610 975 A provides a display substrate and a preparation method thereof and a display device. The display substrate comprises a micro-cavity structure layer and a light-emitting structure layer which are arranged in a stacked mode. A reflection electrode is arranged in the micro-cavity structure layer. A groove is formed in the surface of the micro-cavity structure layer. The light-emitting structure layer comprises a first electrode arranged in the groove, and the first electrode is connected with the reflection electrode. According to the invention, the problem that a cathode and an anode are short-circuited in the preparation process of an existing silicon-based OLED micro-display is solved. US 2018/190944 A1 discloses an organic light-emitting display device that is capable of preventing the reflection of light incident from outside and improving transparency when a transparent display is realized. The organic light-emitting display device includes a first substrate defined by a transmission area and a light emission area, a first electrode located on a region of a planarization film, which covers a thin film transistor, corresponding to the light emission area, the first electrode being electrically connected to the thin film transistor, and a shielding layer located to cover a region of the planarization film corresponding to the transmission area and the side surface of the planarization film, the shielding layer being electrically isolated from the first electrode. US 2018/122877 A1 discloses an organic light emitting display device and a method of manufacturing the same. In the organic light emitting display, an anode connected to a thin film transistor and a bank disposed along the edge of the anode are simultaneously formed through one mask process, and a partition is formed to cover the side surface of the anode, thereby preventing damage to a pad cover electrode by an etching solution or etching gas of the anode without any separate pad protective film. US 2016/351851 A1 discloses an organic light emitting display apparatus in which an anode electrode, an organic emission layer, a cathode electrode, and an auxiliary electrode connected to the cathode electrode and disposed on the same layer as that of the anode electrode are disposed in an active area of the substrate, a signal pad and a pad electrode connected to the signal pad and covering a top of the signal pad are disposed in a pad area of the substrate, and a top of the pad electrode has lower oxidation rate than the top of the signal pad. SUMMARY An object of the present disclosure is to provide a display panel and a display device, to improve display brightness. For achievement of the above object of the present disclosure, following technical solutions are employed. According to a first aspect of the present disclosure, a display panel is provided. The display panel includes a display area and a peripheral area surrounding the display area. The display panel includes: a driving back plate comprising a driving circuit layer and a first reflecting electrode layer arranged in a stacked manner; the first reflecting electrode layer comprising a plurality of first primary reflecting electrodes in the display area and a plurality of first auxiliary reflecting electrodes in the peripheral area; and the plurality of the first primary reflecting electrodes being electrically connected with the driving circuit layer;a first insulating layer on a side of the first reflecting elect