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DE-102025135711-A1 - LED DIODE AND LED INDICATOR DEVICE

DE102025135711A1DE 102025135711 A1DE102025135711 A1DE 102025135711A1DE-102025135711-A1

Abstract

A light-emitting diode (De) and a light-emitting diode display device are described. In some examples, the light-emitting diode includes a semiconductor layer (143), a first element electrode (141) on the semiconductor layer (143), a second element electrode (142) on the semiconductor layer (143), a first auxiliary electrode (145) connected to the first element electrode (141) and located on a lateral surface of the light-emitting diode, a first protective layer (144) on the first element electrode (141) and the second element electrode (142), and a second protective layer (146) on the first auxiliary electrode (145) and the first protective layer (144).

Inventors

  • Su-Min Lee
  • Byung-Hyun Lee
  • Dae-Young Seo
  • Tae-yong Kim
  • Young-In Jang

Assignees

  • LG DISPLAY CO., LTD.

Dates

Publication Date
20260513
Application Date
20250905
Priority Date
20241111

Claims (15)

  1. A light-emitting diode (De) comprising: a semiconductor layer (143); a first element electrode (141) on the semiconductor layer (143); a second element electrode (142) on the semiconductor layer (143); a first auxiliary electrode (145) connected to the first element electrode (141) and located on a lateral surface of the light-emitting diode (De); a first protective layer (144) on the first element electrode (141) and the second element electrode (142); and a second protective layer (146) on the first auxiliary electrode (145) and the first protective layer (144).
  2. The light-emitting diode (De) according to Claim 1 , wherein a position of the second element electrode (142) is higher than a position of the first element electrode (141).
  3. The light-emitting diode (De) according to Claim 1 or 2 , wherein the first protective layer (144) exposes the first element electrode (141) and the second element electrode (142), and wherein the first protective layer (144) extends from an upper surface of the first element electrode (141) to a lateral surface of the semiconductor layer (143).
  4. The light-emitting diode (De) according to one of the Claims 1 until 3 , wherein the second protective layer (146) is in contact with the first auxiliary electrode (145) and exposes the first auxiliary electrode (145) which is located on one lateral surface of the light-emitting diode (De).
  5. The light-emitting diode (De) according to one of the Claims 1 until 4 , wherein the first auxiliary electrode (145) is in contact with an upper surface of the first element electrode (141) and extends from the upper surface of the first element electrode (141) to one lateral surface of the light-emitting diode (De), and wherein the first auxiliary electrode (145) covers the first protective layer (144) on one lateral surface of the light-emitting diode (De).
  6. The light-emitting diode (De) according to one of the Claims 1 until 5 , further comprising: a second auxiliary electrode (148) located on another lateral surface of the light-emitting diode (De), wherein the other lateral surface of the light-emitting diode (De) is separated from the one lateral surface of the light-emitting diode (De).
  7. The light-emitting diode according to Claim 6 , wherein the second auxiliary electrode (148) is in contact with an upper surface of the second element electrode (142) and extends from the second element electrode (142) to the other lateral surface of the light-emitting diode (De), and wherein on the other lateral surface of the light-emitting diode (De) the second auxiliary electrode (148) covers the first protective layer (144) and the second protective layer (146) exposes the second auxiliary electrode (148) which is located on the other lateral surface of the light-emitting diode (De).
  8. The light-emitting diode (De) according to Claim 6 or 7 , wherein the first auxiliary electrode (145) has a first area exposed by the second protective layer (146), the second auxiliary electrode (148) has a second area exposed by the second protective layer (146), and the second area of the second auxiliary electrode (148) is higher than the first area of the first auxiliary electrode (145).
  9. The light-emitting diode (De) according to one of the Claims 1 until 8 , wherein the first protective layer (144) extends from an upper surface of the first element electrode (141) to a lateral surface of the semiconductor layer (143) and wherein the second protective layer (146) exposes the first auxiliary electrode (145) which is located on the lateral surface of the semiconductor layer (143).
  10. A light element indicator device () comprising: a substrate (110); a light element (140) arranged on the substrate (110), wherein the light element (140) comprises a first element electrode (141), a second element electrode (142) and an auxiliary electrode, wherein the first element electrode (141) and the second element electrode (142) are spaced apart from each other and the auxiliary electrode is located on at least one side of the light element (140); a first electrode (152) connected to the first element electrode (141); and a second electrode (162) on the first electrode (152) and connected to the second element electrode (142), wherein at least one of the first electrode (152) and the second electrode (162) is connected via the auxiliary electrode to at least one of the first element electrode (141) and the second element electrode (142).
  11. The light element indicator device according to Claim 10 , further comprising: a thin-film transistor (TR) arranged on the substrate (110); and a reflection electrode arranged on the thin-film transistor (TR), wherein the reflection electrode is connected to the thin-film transistor (TR) and the first electrode (152), and preferably further comprising: a current conductor (128) arranged on the substrate (110) and spaced apart from the thin-film transistor (TR), wherein the current conductor (128) is in the same layer as a source electrode and a drain electrode of the thin-film transistor (TR), wherein the light-emitting diode display device preferably comprises: a first connecting electrode (134) arranged on the thin-film transistor (TR) and the current conductor (128), wherein the first connecting electrode (134) is connected to the current conductor (128), and wherein the first connecting electrode (134) and the reflection electrode are preferably arranged in the same layer and preferably contain the same material, and wherein the light-emitting diode display device preferably further comprises a second connecting electrode (154) on the first connecting electrode (134) and in contact with the first connecting electrode (134), wherein the second electrode (162) is connected to the second connecting electrode (154), and wherein the light element display device preferably further comprises an adhesive layer (117) arranged on the reflection electrode; a second planarization layer (118) on which the first electrode (152) is arranged; and a third planarization layer (119) covering the first electrode (152), wherein the second electrode (162) is located on the third planarization layer (119), and wherein the second electrode (162) is in contact with the second connecting electrode (154) via a contact hole arranged in the third planarization layer (119).
  12. The light element indicator device according to Claim 11 , further comprising: a first capacitor electrode (124); and a second capacitor electrode (125) on the first capacitor electrode (124), wherein the second capacitor electrode (125) is electrically connected to the thin-film transistor (TR).
  13. The light element indicator device according to any of the Claims 10 until 12 , wherein the first electrode (152) is in contact with a first auxiliary electrode (145) of the auxiliary electrode located on one side of the luminaire element (140), and wherein the second electrode (162) is in contact with a second auxiliary electrode (148) of the auxiliary electrode located on the other side of the luminaire element (140).
  14. The light element indicator device according to Claim 13 , wherein the second auxiliary electrode (148) is in contact with an upper surface of the second element electrode (142) and extends from the second element electrode (142) to the other side of the luminaire element (140), and wherein on the other side of the luminaire element (140) the second auxiliary electrode (148) covers a first protective layer (144) and a second protective layer (146) exposes the second auxiliary electrode (148) which is located on the other side of the luminaire element (140).
  15. The light element indicator device according to Claim 11 or 12 , wherein the first element electrode (141) is located on the second planarization layer (118).

Description

background Technical field The present disclosure relates to a display device, in particular a light-emitting diode display device. Discussion of the state of the art As the information society progresses, the demand for different types of display devices increases, and flat panel display (FPD) devices such as liquid crystal display devices and light-emitting diode (LED) display devices have been developed and used in various fields. Among flat-screen displays, light-emitting diode (LED) displays emit light due to the radiative recombination of an exciton. The exciton is formed from an electron and a hole by injecting charges into a phosphor layer between a cathode (for injecting electrons) and an anode (for injecting holes) in an LED. The LED display offers several advantages and improved features. Compared to the liquid crystal display, for example, the LED display has a wide viewing angle because it is self-illuminating. Since no backlight is required, the LED display is also extremely thin and lightweight. Furthermore, the LED display is also advantageous in terms of power consumption. The light-emitting diode (LED) display device can contain inorganic-based and organic-based light-emitting elements. Inorganic-based light-emitting elements exhibit relatively good stability, fast response characteristics, and high contrast ratios, and micro-LEDs (micro-LEDs or uLEDs) are frequently used as inorganic-based light-emitting elements for high resolutions. The inorganic-based light-emitting elements are formed on an element substrate and transferred to an array substrate of a display device. Signal electrodes are then formed on the array substrate of the display device to transmit signals. However, because the size of the light-emitting element is relatively small, the distance between the signal electrodes is very short, which can lead to an electrical short circuit between the electrodes of the light-emitting element. SUMMARY OF THE REVELATION Accordingly, embodiments of the present disclosure relate to a light-emitting diode display device which substantially eliminates one or more of the problems arising from limitations and disadvantages of the prior art. One aspect of the present disclosure is to provide a light-emitting diode (LED) indicator device that is capable of preventing an electrical short circuit between the electrodes of an LED. Further features and aspects are set out in the following description and are partly evident from the description or can be learned through the practical application of the inventive concepts described herein. Other features and aspects of the inventive concepts can be realized and achieved through the structure particularly highlighted in or derivable from the written description, as well as through the claims and the accompanying drawings. To achieve these and other aspects of the concepts according to the invention, as embodied herein and generally described, a light-emitting diode comprises a semiconductor layer; a first element electrode on the semiconductor layer; a second element electrode on the semiconductor layer; a first auxiliary electrode connected to the first element electrode and located on a lateral surface of the light-emitting diode; a first protective layer on the first element electrode and the second element electrode; and a second protective layer on the first auxiliary electrode and the first protective layer. According to aspects of the present disclosure, a light-emitting luminaire device comprises a substrate; a light-emitting luminaire arranged on the substrate, wherein the light-emitting luminaire has a first element electrode, a second element electrode, and an auxiliary electrode, wherein the first element electrode and the second element electrode are spaced apart from each other and the auxiliary electrode is located on at least one side of the light-emitting luminaire; a first electrode connected to the first element electrode; and a second electrode on the first electrode connected to the second element electrode, wherein at least one of the first electrode and the second electrode is connected via the auxiliary electrode to at least one of the first element electrodes and the second element electrode is connected. It is understood that both the preceding general description and the following detailed description are examples and explanations and serve to further explain the concepts of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included for a better understanding of the disclosure and form part of this application, illustrate embodiments of the disclosure and, together with the description, serve to explain various principles of the disclosure. The drawings include: 1 is an example of an equivalent circuit diagram of a subpixel of a light-emitting diode display device according to one or more embodiments of the present disclosure; 2 is a schematic top view of a light-emitting diod