Organic light emitting diode display device

TWI941439BActive Publication Date: 2026-10-01LG DISPLAY CO LTD
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Patent Information

Application Number
TW114139741
Authority / Receiving Office
TW · TW
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-12-29
Filing Date
2022-11-25
Publication Date
2026-10-01
Estimated Expiration
2042-11-24

AI Technical Summary

Technical Problem

OLED display devices suffer from lateral leakage and increased low-level voltage, leading to higher driving voltage, power consumption, and deterioration of brightness uniformity.

Method used

The OLED display device incorporates a dam layer with inverted conical spacers around specific sub-pixels, extending the hole-sharing and electron-sharing layers to adjacent sub-pixels via the side and top surfaces of the spacers, while the cathode is cut off on the side surface of the spacers, lengthening the current path and minimizing lateral leakage and low-level voltage current paths.

Benefits of technology

This design reduces lateral leakage current and minimizes the rise of low-level voltage, improving brightness uniformity and efficiency by preventing current errors between sub-pixels.

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Patent Text Reader

Abstract

A display device includes: a first substrate; a dam layer on the first substrate to define red, green, and blue sub-pixels; thin-film transistors in the red, green, and blue sub-pixels; light-emitting diodes in the red, green, and blue sub-pixels; and a plurality of spacers located on the periphery of one of the red, green, and blue sub-pixels on the dam layer, wherein the light-emitting diode includes an anode, a hole-sharing layer, an emitting layer, an electron-sharing layer, and a cathode, wherein the hole-sharing layer includes at least one of a hole transport layer and a hole injection layer, and the electron-sharing layer includes at least one of an electron transport layer and an electron injection layer, wherein the spacers have an inverted conical shape, wherein the hole-sharing layer and the electron-sharing layer extend to adjacent sub-pixels via the side and top surfaces of the spacers, and wherein the electron-sharing layer on the side surface of the spacer is exposed between a cathode on the top surface of each spacer and a cathode on the dam layer.
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Citation Information

Patent Citations

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    CN108281462A

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    CN113809131A

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    CN113851509A

  • Organic light-emitting display device

    TW201436195A

  • Display device

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