Display Pixel Conductive Layer Layout for Uniform Light Emission
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Solution Overview
Problem
In small-sized or high-resolution display apparatuses, the reduced spacing between thin-film transistors (TFTs) and wirings leads to deteriorated light emission uniformity due to increased parasitic capacitance.
Innovation Solution
The display apparatus includes a pixel design with a driving TFT and storage capacitor, featuring a conductive layer with an extending portion that overlaps the light-emitting region, symmetrical regions, and a conductive layer connected to a lower driving voltage line through an insulating layer, along with a mesh structure of wiring layers that intersect and connect to each other, reducing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the spacing between TFTs and wirings is reduced to achieve small size or high resolution, then the display apparatus achieves higher resolution and smaller size, but parasitic capacitance increases causing deteriorated light emission uniformity
Solution Approach 1:
A conductive layer is introduced as an intermediary element between the pixel electrode and the driving TFT. This conductive layer includes an extending portion that passes over the central portion of the light-emitting region, serving as a mediator to reduce parasitic capacitance between the pixel electrode and the driving TFT while maintaining the reduced spacing required for high resolution and small size displays
Solution Approach 2:
The patent changes the electrical parameters by applying a driving voltage to the conductive layer, which is connected to a lower driving voltage line. This parameter change optimizes the electrical characteristics to minimize parasitic capacitance effects while maintaining proper light emission control, thereby improving light emission uniformity without sacrificing resolution
Data Source
AI summary
A display apparatus with improved light emission uniformity includes a pixel. The pixel includes a driving thin-film transistor (TFT); a storage capacitor; a driving semiconductor layer; a first electrode layer; a second electrode layer; a pixel electrode; a pixel-defining layer defining a light-emitting region; and a conductive layer interposed between the first electrode layer and the pixel electrode and including an extending portion that at least partially overlaps the light-emitting region in a plane view to pass over a central portion of the light-emitting region.