Pixel Structure Auxiliary Electrode Reduces Resistance
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Solution Overview
Problem
Traditional top emission display technologies face challenges such as high electrode resistance, low transmittance, and serious IR drop, leading to poor luminous uniformity in electroluminescent devices, particularly on large-sized displays.
Innovation Solution
A pixel structure design that includes a data line, scan line, active device, and light emitting device with a first auxiliary electrode electrically connected to the light emitting device's first electrode layer, reducing the resistance through parallel connection and improving overall luminous uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If traditional top emission display technology is used, then pixel aperture ratio is improved, but electrode resistance increases and luminous uniformity deteriorates
Solution Approach 1:
The electrode system is segmented into multiple independent electrodes (first auxiliary electrode, second auxiliary electrode, third auxiliary electrode) distributed across the pixel structure. Each electrode independently contributes to current distribution, preventing localized resistance issues and improving overall luminous uniformity while maintaining the top emission aperture ratio.
Solution Approach 2:
Auxiliary electrodes are introduced as intermediary conductive elements between the data line/scan line and the light emitting device. These intermediary electrodes provide additional current distribution pathways, reducing the resistance burden on the main electrodes and improving current uniformity across the pixel array.
2Illumination intensity
If electrode thickness is reduced, then transmittance is improved, but electrode resistance increases
Solution Approach 1:
The electrode function is segmented across multiple thinner electrode layers rather than relying on a single thick electrode. This segmentation allows each layer to be sufficiently thin for high transmittance while the collective arrangement of multiple layers provides adequate current conduction capacity.
Solution Approach 2:
Multiple auxiliary electrodes are merged into the electrical circuit to work collectively with the main electrodes. This merging creates parallel current pathways that reduce overall resistance without requiring any individual electrode to be thick, thereby maintaining high transmittance.
3Area of stationary object
If device size is increased, then display area is improved, but IR drop increases and luminous uniformity deteriorates
Solution Approach 1:
The pixel structure is segmented with multiple auxiliary electrodes distributed across the enlarged display area. This segmentation ensures that no single electrode has to span the entire large distance, reducing the IR drop across each electrode segment and maintaining uniform current distribution across the expanded display area.
Solution Approach 2:
The electrode arrangement transitions from a simple planar configuration to a multi-dimensional network incorporating auxiliary electrodes at different positions and orientations. This dimensional expansion creates additional current pathways that reduce resistance and IR drop effects across large display areas.
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 design significantly reduces the total resistance of the pixel structure by approximately 40%, enhancing luminous uniformity and preventing current decline issues in electroluminescent devices.
Implementation Method 1
the design of the invention that coordinates the first electrode layer of the light emitting device with the auxiliary electrode decreases the resistance of the first electrode layer through parallel connection, so as to significantly reduce the total resistance of the pixel structure
Data Source
AI summary
A pixel structure, including a data line, a scan line, at least one active device, a first auxiliary electrode, and a light emitting device, is provided. The at least one active device is electrically connected with the data line and the scan line, and each active device includes a gate, a channel layer, a source, and a drain. The first auxiliary electrode is electrically insulated from the active device. The light emitting device is disposed above the first auxiliary electrode, wherein the light emitting device includes a first electrode layer, a light emitting layer, and a second electrode layer. The first electrode layer is electrically connected with the first auxiliary electrode. The light emitting layer is disposed on the first electrode layer. The second electrode layer is disposed on the light emitting layer, wherein the second electrode layer is electrically connected with the active device.