Display Pixel Conductive Layer 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 increasing parasitic capacitance.
Innovation Solution
A display apparatus design featuring a pixel structure with a conductive layer having an extending portion that overlaps the light-emitting region, symmetrical regions on either side of the overlap, and a conductive layer connected to a lower driving voltage line through an insulating layer, along with a node connection line and a compensation TFT, to improve light emission uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the spacing between TFTs and wirings is reduced to achieve small size or high resolution, then the display apparatus achieves smaller size or higher resolution, but parasitic capacitance increases causing deteriorated light emission uniformity
Solution Approach 1:
A conductive layer is introduced as an intermediary element between the second electrode layer and the pixel electrode. This conductive layer includes an extending portion that passes over a central portion of the light-emitting region, serving as a mediator to distribute electrical signals more uniformly and reduce parasitic capacitance effects, thereby improving light emission uniformity without increasing overall device size.
Solution Approach 2:
The conductive layer is positioned in an intermediate layer between existing structures (between the second electrode layer and pixel electrode), utilizing the vertical dimension to add functionality without increasing the horizontal footprint. This allows the extending portion to overlap the light-emitting region in plan view while maintaining compact device dimensions.
2Manufacturing precision
If the number of TFTs and wirings is increased to accurately control light emission, then light emission control accuracy is improved, but device complexity and parasitic capacitance increase
Solution Approach 1:
The conductive layer serves multiple functions: it provides electrical connection between the second electrode layer and pixel electrode, distributes driving voltages uniformly across the light-emitting region, and reduces parasitic capacitance effects. This multi-functionality allows accurate light emission control without proportionally increasing the number of discrete TFTs and wirings.
Solution Approach 2:
The conductive layer merges the functions of signal transmission and voltage distribution into a single structural element. By combining these functions in one layer rather than using separate TFTs and wirings for each function, the device complexity is reduced while maintaining control accuracy.
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.