Display Electrode Layout for Uniform LED Placement
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Solution Overview
Problem
Display devices face challenges in preventing light-emitting diodes from gathering at specific locations, leading to uneven emission and potential defects in the display area.
Innovation Solution
The implementation of electrodes with varying widths and floating electrodes to reduce the electric field intensity, guiding light-emitting diodes to the center of the emission area and preventing them from concentrating at edges or corners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrodes have uniform width across the emission area, then the manufacturing process is simple, but light-emitting diodes gather at edges and corners causing uneven emission
Solution Approach 1:
The electrode structure is designed with different widths at different locations: wider at the center and narrower at edges and corners. This local variation in electrode width creates corresponding variations in electric field intensity, with lower intensity at edges and corners, thereby preventing light-emitting diodes from gathering at these locations and achieving uniform distribution across the emission area.
Solution Approach 2:
The electrode pattern intentionally introduces asymmetry by making edge and corner electrodes narrower than center electrodes. This asymmetric design compensates for the natural tendency of light-emitting diodes to accumulate at edges and corners during the inkjet printing process, resulting in more uniform light emission across the entire display area.
2Manufacturing precision
If floating electrodes are added to reduce electric field intensity, then light-emitting diode distribution improves, but device complexity increases
Solution Approach 1:
Floating electrodes are introduced as intermediary elements positioned between the main electrodes. These floating electrodes do not require electrical connections and serve solely to modulate the electric field distribution. By placing them strategically in areas where light-emitting diodes tend to accumulate, they effectively reduce local electric field intensity and guide uniform distribution without adding complex control circuitry.
3Manufacturing precision
If electrode corners are chamfered or rounded to reduce electric field concentration, then light-emitting diode gathering is prevented, but manufacturing precision requirements increase
Solution Approach 1:
Instead of attempting to precisely control the electric field through complex geometry, the design inverts the approach by making the electrode geometry itself asymmetric from the outset. The narrower width at edges and corners is built into the electrode pattern design, which naturally produces the desired electric field distribution without requiring precise corner chamfering or rounding.
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
This solution ensures uniform light distribution and reduces the likelihood of light-emitting diodes gathering at undesired locations, enhancing the display's performance and reliability.
Implementation Method 1
portions having a narrow width are formed at at least some or a number of the electrodes at the edges of the emission area, so that the distances between the electrodes are increased. By doing so, the intensity of the electric field is reduced to prevent the light-emitting diodes from gathering at the edges of the emission area and to guide them to the middle of the emission area.
Data Source
AI summary
A display device includes electrodes disposed on a substrate, extended in a first direction, and spaced apart from one another in a second direction intersecting the first direction, and light-emitting elements having ends disposed on the electrodes, wherein the electrodes include a first electrode having a first portion and a second portion, and a floating electrode adjacent to the first portion of the first electrode, and a width of the second portion is greater than a width of the first portion in the second direction.