Search

EP-3843154-B1 - DISPLAY DEVICE

EP3843154B1EP 3843154 B1EP3843154 B1EP 3843154B1EP-3843154-B1

Inventors

  • LIN, HSIAO-LANG
  • TSAI, TSUNG-HAN
  • LEE, KUAN-FENG

Dates

Publication Date
20260513
Application Date
20201218

Claims (14)

  1. A display device (100) having a display area (105) and a non-display area (106), said display device comprising: a substrate (101); a first inorganic layer (110) disposed on the substrate (101); a thin film transistor (120) disposed on the first inorganic layer (110), said thin film transistor comprising a metal oxide semiconductor (121), a gate electrode (122) overlapping the metal oxide semiconductor (121), and a source electrode (124) and a drain electrode (123) electrically connected with the metal oxide semiconductor (121); a storage capacitor (130) comprising a first electrode (131) and a second electrode (132), the first electrode (131) electrically insulated from the second electrode (132) and overlapped with the second electrode (132), wherein the first electrode (131) is electrically connected with the gate electrode (122), and the second electrode (132) is electrically connected with the source electrode (124); a first organic layer (140) disposed on the thin film transistor (120), said first organic layer comprising a contact via (141); a blue organic light emitting diode (150) comprising an anode (151), a cathode (152), and a blue organic light emitting layer (153) disposed therebetween, the blue organic light emitting layer (153) electrically connected with the anode (151) and the cathode (152), the anode (151) electrically connected with the source electrode (124) through the contact via (141); a pixel definition layer (142) disposed on the first organic layer (140); a first auxiliary electrode (155) disposed between the substrate (101) and the pixel definition layer (142), wherein the blue organic light emitting diode (150) is electrically connected with the first auxiliary electrode (155) through a via (156); a second auxiliary electrode (155') disposed on the substrate (101); a first sealing layer (160) disposed on the blue organic light emitting diode (150); a wavelength conversion element (166) disposed on the first sealing layer (160); a blue light blocking element (170) disposed on the wavelength conversion element (166); and a second sealing layer (179) disposed on the blue light blocking element (170); the display device is characterized in that the first auxiliary electrode (155) is disposed in the display area, the second auxiliary electrode (155') is disposed in the non-display area, the first auxiliary electrode (155) is electrically connected to the second auxiliary electrode (155'), and the first auxiliary electrode (155) and the second auxiliary electrode (155') are formed of a same layer.
  2. The display device of claim 1, further comprising: a second inorganic layer (112) disposed between the gate electrode (122) and the metal oxide semiconductor (121); and a third inorganic layer (113) disposed between the source electrode (124) and the gate electrode (122).
  3. The display device of claim 2, wherein the first electrode (131) of the storage capacitor (130) is disposed between the second inorganic layer (112) and the third inorganic layer (113).
  4. The display device of claim 2, wherein the second electrode (132) of the storage capacitor (130) is disposed between the second inorganic layer (112) and the third inorganic layer (113).
  5. The display device of claim 2 or claim 3, wherein the second electrode (132) of the storage capacitor (130) is disposed between the third inorganic layer (113) and the first organic layer (140) .
  6. The display device of claim 2, wherein the display device further comprises a fourth inorganic layer (134) and a fifth inorganic layer (135) disposed between the gate electrode (122) and the first organic layer (140), and the first electrode (131) of the storage capacitor (130) is disposed between the fourth inorganic layer (134) and the fifth inorganic layer (135).
  7. The display device of claim 2, wherein the display device further comprises a fourth inorganic layer (134) and a fifth inorganic layer (135) disposed between the gate electrode (122) and the first organic layer (140), and the second electrode (132) of the storage capacitor (130) is disposed between the fourth inorganic layer (134) and the fifth inorganic layer (135).
  8. The display device of claim 1, wherein the first electrode (131) of the storage capacitor (130) is disposed between the substrate (101) and the first inorganic layer (110).
  9. The display device of claim 1, wherein the first auxiliary electrode (155) is electrically connected with the cathode (152), wherein a thickness of the first auxiliary electrode (155) is greater than a thickness of the cathode (152).
  10. The display device of claim 1 or claim 9, wherein the pixel definition layer (142) is disposed between the blue organic light emitting layer (153) and the first organic layer (140), and the first auxiliary electrode (155) is disposed between the pixel definition layer (142) and the first organic layer (140).
  11. The display device of claim 1 or claim 9, further comprising: a second inorganic layer (112) disposed between the gate electrode (122) and the metal oxide semiconductor (121); and a third inorganic layer (113) disposed between the first organic layer (140) and the second inorganic layer (112), wherein the first auxiliary electrode (155) is disposed between the third inorganic layer (113) and the first organic layer (140).
  12. The display device of claim 1 or claim 9, further comprising: a second inorganic layer (112) disposed between the gate electrode (122) and the metal oxide semiconductor (121); and a third inorganic layer (113) disposed between the first organic layer (140) and the second inorganic layer (112), wherein the first auxiliary electrode(155) is disposed between the second inorganic layer (112) and the third inorganic layer (113).
  13. The display device of claim 1 or claim 9, wherein the first auxiliary electrode (155) is disposed between the substrate(101) and the first inorganic layer (110).
  14. The display device of claim 1 or claim 9, further comprising a fourth inorganic layer (134) and a fifth inorganic layer (135) disposed between the gate electrode (121) and the first organic layer (140), wherein the first auxiliary electrode (155) is disposed between the fourth inorganic layer (134) and the fifth inorganic layer (135).

Description

Field of the Disclosure The present disclosure relates to a display device, and more particularly to a display device with an organic light emitting diode. Background of the Disclosure In an electronic (display) device, a capacitor is provided so that a thin film transistor may have a stable voltage during the operation of each frame. If the space for a capacitor is too limited to have the needed capacitance value, the brightness uniformity of the display may be affected. In addition, when a transparent conductive material is used in the cathode of an organic light emitting diode, the higher impedance of the transparent conductive material affects the voltage distribution, and the insufficient voltage causes IR drop. Some electronic devices are equipped with auxiliary electrodes to reduce the aforementioned IR drop problem. However, under the coexistence of capacitors and auxiliary electrodes, an interference may occur between the capacitor and the auxiliary electrode. The interference problem needs to be solved. EP3667754 A1 discloses a display device comprising a base substrate, a buffer layer disposed on the base substrate, a thin film transistor disposed on the first inorganic layer, a storage capacitor comprising a first electrode and a second electrode, a planarization layer disposed on the thin film transistor and comprising a contact via, a blue organic light emitting diode comprising a pixel electrode, a common electrode and a blue organic layer disposed therebetween, a thin film encapsulation layer disposed on the blue organic light emitting diode, a light conversion pattern disposed on the thin film encapsulation layer, a color filter disposed on the light conversion pattern and a second base substrate disposed on the color filter. EP3355357 A1 discloses a display device comprising a first substrate, a buffer layer disposed on the first substrate, a thin film transistor disposed on the buffer layer, a planarization layer disposed on the thin film transistor and comprising a contact via, a blue organic light emitting diode comprising a first electrode, a second electrode and a blue emission layer disposed therebetween, a capping layer disposed on the blue organic light emitting diode, a color conversion layer disposed on the capping layer, a blue light blocking filter disposed on the color conversion layer and a second substrate disposed on the blue light blocking filter. US2016293676 A1 discloses a display device comprising a passivation layer, a third light conversion layer disposed on the passivation layer, a blue color filter disposed on the third light conversion layer and a cover glass disposed on the blue color filter. US2018122882 A1 discloses a display device comprising a storage intermediate electrode disposed between the buffer layer and the interlayer insulation layer. EP3188274 A1 discloses a display device comprising an auxiliary electrode and a storage capacitor. Summary of the Disclosure In view of this, the present disclosure proposes a display device to solve the technical problems in the field For example, the configuration of the display device of the present disclosure may simplify the manufacturing process when the storage capacitor and other electrodes of the display device (for example the thin film transistor) are formed of the same conductive layer. For a further example, the arrangement design of the auxiliary may mitigate the interference between the capacitor and the auxiliary electrode. This is achieved by a display device according to the claims. The dependent claims pertain to corresponding further developments and improvements. As will be seen more clearly from the detailed description following below, a display device having a display area and a non-display area is provided by the present disclosure, which includes a substrate, a first inorganic layer, a thin film transistor, a storage capacitor, a first organic layer, a blue organic light emitting diode, a pixel definition layer, a first auxiliary electrode, a second auxiliary electrode, a first sealing layer, a wavelength conversion element, a blue light blocking element and a second sealing layer. A first inorganic layer is disposed on the substrate. A thin film transistor is disposed on the first inorganic layer, and includes a metal oxide semiconductor, a gate electrode overlapping the metal oxide semiconductor, a source electrode and a drain electrode electrically connected with the metal oxide semiconductor. A storage capacitor includes a first electrode and a second electrode. The first electrode is electrically insulated from the second electrode and overlaps with the second electrode. The first electrode is electrically connected with the gate electrode and the second electrode is electrically connected with the source electrode. A first organic layer disposed on the thin film transistor and includes a contact via. A blue organic light emitting diode includes an anode, a cathode, and a blue organic light