COA WOLED Micro Cavity Resonance for Light Efficiency
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Solution Overview
Problem
Color Filter on Array (COA) White Organic Light Emitting Diode (WOLED) structures have relatively low light emission efficiency for primary colors due to limitations in adjusting device thickness for micro cavity resonance, hindering the enhancement of light emission efficiency.
Innovation Solution
A COA WOLED structure with a semi-reflection layer and transparent photoresist layers of varying thicknesses is introduced, forming an optimum micro cavity structure for each color, allowing for enhanced light emission efficiency through micro cavity resonance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional COA WOLED structure is used, then the device can be manufactured with simple structure and ease of operation, but the light emission efficiency for primary colors is relatively low due to inability to adjust device thickness for micro cavity resonance
Solution Approach 1:
The device is segmented into multiple functional layers including substrate, gate terminal, gate insulation layer, oxide semiconductor layer, source/drain terminals, passivation layer, anode, pixel definition layer, white light emitting layer, and color filter layer. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall manufacturing simplicity
Solution Approach 2:
The patent introduces a transparent electrode layer between the anode and pixel definition layer, adding a new dimensional element to the structure. This additional layer enables micro cavity resonance by creating an optical cavity that enhances light emission efficiency without complicating the manufacturing process
2Loss of energy
If device thickness is adjusted for micro cavity resonance in conventional OLED, then light emission efficiency is enhanced, but this approach cannot be applied to COA WOLED due to structural constraints
Solution Approach 1:
A transparent electrode layer is introduced as an intermediary element between the anode and pixel definition layer. This transparent electrode serves as a mediator that enables micro cavity resonance by forming an optical cavity, while maintaining the overall structural simplicity and avoiding complex manufacturing processes
Solution Approach 2:
The patent optimizes the thickness parameters of specific layers, particularly the transparent electrode layer and the combined cavity structure, to achieve optimal micro cavity resonance conditions for enhancing light emission efficiency of primary colors without requiring complex structural changes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The COA WOLED structure significantly improves light emission efficiency for red, green, and blue colors by utilizing micro cavity resonance, thereby increasing the brightness of the display device.
Implementation Method 1
forming an optimum micro cavity structure for each color, allowing for enhanced light emission efficiency through micro cavity resonance
Data Source
AI summary
The present invention provides a COA WOLED structure and a manufacturing method thereof. The structure includes red/green/blue sub pixel zones and each sub pixel zone includes a substrate, a gate terminal, a gate insulation layer, an oxide semiconductor layer, an etch stop layer, source/drain terminals, a passivation protection layer, a red/green/blue photoresist layer, a planarization layer, a semi-reflection layer, a transparent photoresist layer, an anode layer, a pixel definition layer, a photo spacer, a white light emission layer, a cathode layer, and a packaging lid. The present invention arranges a metal semi-reflection layer on a planarization layer and a transparent photoresist layer on the semi-reflection layer and the thickness of the transparent photoresist layer corresponding to each of red/green/blue photoresist layers is so controlled as to obtain an optimum micro cavity length corresponding to each of different colors of light thereby enhance the light emission efficiency of the three primary colors of red/green/blue transmitting through a color filter by using micro cavity resonance thereby effectively increasing the brightness of a COA WOLED device.