Oxide Transistor Shift Register Light-Shielding Layer
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Solution Overview
Problem
Oxide transistors in shift registers are prone to current leakage and degradation due to light exposure, leading to unstable output waveforms and abnormal operation in display devices.
Innovation Solution
Incorporating a light-shielding layer over transistors in the shift register to block light and prevent current leakage, with the light-shielding layer applied with specific voltages to adjust the threshold voltage and enhance output stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If oxide transistor is used in shift register, then higher mobility and easier large area applicability are achieved, but current leakage and degradation due to light sensitivity occur
Solution Approach 1:
A light-shielding layer is introduced as an intermediary component between the light source and the oxide transistor. This layer blocks light from reaching the transistor's active layer, preventing photo-induced threshold voltage shifts and current leakage while allowing the transistor to maintain its high mobility characteristics.
Solution Approach 2:
The light-shielding layer is selectively positioned only over the oxide transistor regions of the shift register circuit that are susceptible to light exposure. This localized approach protects critical transistors from light-induced degradation while minimizing the overall area occupied by shielding structures and maintaining other functional areas unaffected.
2Reliability
If light-shielding layer is added to block light, then current leakage and degradation are prevented, but device complexity increases
Solution Approach 1:
The light-shielding layer is integrated into the existing multi-layer structure of the display device, serving both as a light-shielding component and as part of the overall device architecture. By combining light shielding functionality with existing structural layers, the design avoids adding separate complex shielding mechanisms.
Solution Approach 2:
The light-shielding layer is merged with other functional layers in the device stack, such as combining it with buffer layers or insulating layers that are already present in the oxide transistor structure. This integration approach reduces the total number of discrete components and simplifies the overall device fabrication process.
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 solution effectively prevents current leakage and degradation of oxide transistors due to light, thereby improving the output stability and performance of shift registers in display devices.
Implementation Method 1
a light-shielding layer on or over one or more transistors of the first node controller or at least a part of the output unit to block light
Data Source
AI summary
Disclosed is a shift register which prevents current leakage and degradation of an oxide transistor due to light to improve output stability, and a display device using the same. The shift register includes a plurality of stages, and each stage includes a transmission line unit including a plurality of clock lines to supply a plurality of clock signals and a plurality of power lines to supply a plurality of voltages, a transistor unit including a plurality of transistors, and a light-shielding layer overlapping at least one transistor of the transistor unit so as to block light.