Display Pixel Electrode Repair via Dummy Electrode Reconnection
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Solution Overview
Problem
Display devices face inefficiencies in light emitting due to defects in pixel circuits, leading to impaired light emitting elements, which existing technologies struggle to effectively repair.
Innovation Solution
A display device design incorporating dummy electrodes and a method to reconnect pixel electrodes, allowing for the repair of defective pixels by disconnecting faulty connections and re-establishing electrical paths using dummy electrodes and partial electrodes formed through processes like laser separation and conductive ink or CVD, ensuring proper light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel circuits are used to drive light emitting elements, then light emission function is achieved, but defects in pixel circuits cause light emitting defects
Solution Approach 1:
The pixel electrode is divided into multiple segments (first pixel electrode, second pixel electrode, third pixel electrode) that can be independently connected to light emitting elements. This segmentation allows selective connection to functional light emitting elements while isolating defective ones, thereby maintaining overall light emitting reliability despite pixel circuit defects.
Solution Approach 2:
Dummy electrodes are introduced as intermediary elements between the pixel electrodes and light emitting elements. These dummy electrodes serve as alternative connection paths that can bypass defective pixel circuits, enabling the system to maintain light emitting function even when original pixel circuits fail.
2Reliability
If dummy electrodes are added to enable repair of defective pixels, then light emitting efficiency is improved, but device complexity increases
Solution Approach 1:
The dummy electrodes are designed to serve multiple functions: they act as alignment electrodes during the manufacturing process for positioning light emitting elements, and simultaneously serve as alternative electrical connection paths for repairing defective pixels after manufacturing. This multi-functionality reduces the need for separate repair structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The repair function and alignment function are merged into a single structural element (the dummy electrode). By combining these functions, the patent avoids adding separate complex repair mechanisms, thus improving pixel repair capability while minimizing the increase in overall device complexity.
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
Enhances light emitting efficiency by effectively repairing defective pixels, improving the overall performance and reliability of display devices by ensuring proper electrical connections and light emission.
Implementation Method 1
radiating a laser to the first pixel electrode in the non-emission area to remove a portion of the first pixel electrode of the first pixel
Implementation Method 2
conductive ink or CVD
Data Source
AI summary
A display device includes a first pixel including a first emission area; a second pixel including a second emission area spaced apart from the first emission area in a second direction; and a bank defining a non-emission area between the first emission area and the second emission area. Each of the first pixel and the second pixel includes at least one dummy electrode spaced apart from each other in a first direction intersecting the second direction and extending in the second direction; light emitting elements disposed between the at least one dummy electrode in an emission area; a first pixel electrode electrically connected to a first driving power source and first ends of the light emitting elements; and a second pixel electrode electrically connected to a second driving power source and second ends of the light emitting elements.