Display Pixel Layout With Light-Blocking TFT Protection
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Solution Overview
Problem
Thin-film transistors in display apparatuses are prone to deterioration due to external and internal light exposure, leading to luminance degradation and non-uniform common voltage application, which affects display quality.
Innovation Solution
Incorporating a light-blocking layer on thin-film transistors to prevent light exposure, ensuring uniform common voltage application through connection to the second electrode via a common voltage line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If thin-film transistors are exposed to light from outside or inside the display apparatus, then the light-emitting element can be driven, but the thin-film transistor deteriorates leading to luminance degradation
Solution Approach 1:
The patent divides the display apparatus into distinct functional zones: a light-emitting element area that allows light exposure for operation, and a thin-film transistor area that is shielded from light. The light-blocking layer creates a clear spatial segmentation between these two regions, allowing each to perform its function optimally without interference.
Solution Approach 2:
The light-blocking layer serves as an intermediary element between the light-emitting element and the thin-film transistor. This intermediary blocks harmful light from reaching the transistor while allowing the transistor to still control the light-emitting element electrically, thus protecting the transistor without compromising its driving function.
2Device complexity
If no light-blocking layer is provided, then the device structure is simpler, but the thin-film transistor deteriorates due to light exposure
Solution Approach 1:
Instead of making the entire display apparatus complex, the light-blocking layer is applied locally only to the thin-film transistor area. This localized approach provides protection where needed while maintaining simplicity in the rest of the device structure, including the light-emitting element area which remains exposed for proper operation.
3Device complexity
If common voltage is not uniformly applied to light-emitting elements, then the voltage distribution is simpler, but display quality deteriorates due to non-uniform luminance
Solution Approach 1:
The light-blocking layer is designed to serve multiple functions simultaneously: it protects the thin-film transistor from light exposure, and it also acts as a voltage distribution pathway to ensure uniform common voltage is applied across all light-emitting elements. This multi-functionality achieves both protection and uniform voltage distribution without additional complex structures.
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
Prevents thin-film transistor deterioration, maintains luminance, and achieves uniform luminance across the display apparatus, enhancing display quality and reliability.
Implementation Method 1
a light-blocking layer disposed on the first thin-film transistor or the second thin-film transistor, wherein the light-blocking layer and the first electrode are disposed at the same vertical level, wherein the light-blocking layer overlaps at least one of the first thin-film transistor and the second thin-film transistor
Data Source
AI summary
A display apparatus includes a substrate including a display area and a non-display area; a gate line and a data line disposed on the substrate, wherein the gate line and the data line intersect each other; a plurality of light-emitting elements disposed on the gate line and the data line, wherein each of the plurality of light-emitting elements includes a first electrode, a light-emissive layer, and a second electrode; a first thin-film transistor and a second thin-film transistor disposed under each of the plurality of light-emitting elements; and a light-blocking layer disposed on the first thin-film transistor or the second thin-film transistor, wherein the light-blocking layer and the first electrode are disposed at the same vertical level, wherein the light-blocking layer overlaps at least one of the first thin-film transistor or the second thin-film transistor.