OLED Display Light-Blocking Electrode and Shared Capacitor Structure
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face challenges in minimizing current leakage and reducing the number of masks used in the manufacturing process, which affects the efficiency and reliability of the display.
Innovation Solution
The implementation of a light-blocking electrode and a capacitor design where the first capacitor electrode is disposed on the same layer as the light-blocking electrode, and the second capacitor electrode is on the same layer as one of the electrode members, overlapping with the first capacitor electrode, reduces current leakage and minimizes the number of masks required in the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional capacitor design with separate electrodes is used, then the capacitor can store charge, but it requires additional masks and increases manufacturing complexity
Solution Approach 1:
The patent merges the capacitor electrodes with the transistor electrode members by disposing the first capacitor electrode on the same layer as the light-blocking electrode and the second capacitor electrode on the same layer as the gate electrode, eliminating the need for separate capacitor electrode layers and reducing mask steps
Solution Approach 2:
The electrode members serve dual functions: the light-blocking electrode acts as both a light-blocking structure for the transistor and the first capacitor electrode, while the gate electrode serves as both the transistor gate and the second capacitor electrode, thereby reducing the total number of components and manufacturing steps
2Productivity
If transmitting windows are disposed close to pixels, then light transmission is efficient, but external light reaches semiconductor members causing current leakage
Solution Approach 1:
The patent introduces a light-blocking electrode as an intermediary element positioned between the transmitting windows and the semiconductor members. This light-blocking electrode blocks external light from reaching the semiconductor members while allowing the transmitting windows to maintain their light transmission function, thereby resolving the contradiction between light transmission efficiency and current leakage prevention
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
This design effectively minimizes current leakage and reduces the number of masks used, enhancing the efficiency and reliability of the OLED display by blocking external light from reaching the semiconductor member and optimizing the capacitor structure.
Implementation Method 1
blocking external light from reaching the semiconductor member
Implementation Method 2
The capacitor includes a first capacitor electrode disposed on a same layer as the light-blocking electrode, and a second capacitor electrode disposed on a same layer as a first one of the plurality of electrode members
Data Source
AI summary
An organic light emitting diode display includes a substrate, a plurality of pixels disposed on the substrate, and a plurality of transmitting windows configured to transmit light therethrough. The plurality of transmitting windows is spaced apart from the plurality of pixels. Each of the plurality of pixels includes a transistor and a capacitor. The transistor includes a light-blocking electrode disposed on the substrate and a plurality of electrode members disposed at different layers on the light-blocking electrode. The capacitor includes a first capacitor electrode disposed on a same layer as the light-blocking electrode, and a second capacitor electrode disposed on a same layer as a first one of the plurality of electrode members to overlap the first capacitor electrode.