Transparent Repair Wiring Layout for High-Aperture Displays
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Solution Overview
Problem
The repair process in display apparatuses often leads to a decrease in aperture ratio due to the use of repair wiring, particularly in transparent displays, and complicates the repair process.
Innovation Solution
The display apparatus incorporates a repair wiring system with first and second repair wirings having stacked structures of lower and upper wiring layers made of conductive metal oxides, which have higher transmittance and lower energy absorption rates, minimizing the impact on aperture ratio and simplifying the repair process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repair wiring is used to connect the light-emitting device to the pixel driving circuit, then the electrical connection is restored, but the aperture ratio decreases
Solution Approach 1:
The repair wiring is configured as a stacked structure with multiple wiring layers (first wiring layer and second wiring layer) extending in the thickness direction rather than only in the plane. This vertical arrangement allows the wiring to achieve the necessary electrical connection while occupying minimal planar area, thereby preserving the aperture ratio.
Solution Approach 2:
The repair wiring employs a composite structure combining different wiring layers with specific materials (conductive metal oxides) that balance electrical conductivity with optical transparency. The stacked configuration of multiple layers provides both the required electrical connection and minimal impact on light transmission.
2Reliability
If conventional repair wiring materials are used, then the electrical connection is established, but the transmittance decreases
Solution Approach 1:
The patent specifies that the wiring layers use conductive metal oxide materials with carefully controlled properties: the first wiring layer has a resistance of 10-100 ohm·sq and the second wiring layer has a resistance of 1-10 ohm·sq. These parameter optimizations allow the wiring to maintain good electrical conductivity while achieving sufficient light transmittance.
Solution Approach 2:
The repair wiring uses a composite structure of multiple wiring layers made of conductive metal oxides, where each layer is optimized for specific electrical and optical properties. This composite approach enables simultaneous achievement of reliable electrical connection and acceptable transmittance.
3Manufacturing precision
If the upper wiring layer has higher energy absorption rate, then the laser cutting precision is improved, but the overall transmittance decreases
Solution Approach 1:
The energy absorption rate is differentiated by location within the wiring structure. The upper wiring layer is designed with higher energy absorption rate specifically for the laser cutting process, while the lower wiring layer has lower energy absorption. This local differentiation allows precise laser cutting without excessive heat accumulation that would compromise overall transmittance.
Solution Approach 2:
The patent specifies different energy absorption rates for different wiring layers: the upper wiring layer has a higher energy absorption rate (0.1-1.0) compared to the lower wiring layer (0.01-0.1). This parameter optimization enables the laser to effectively cut through the upper layer while minimizing impact on the lower layer and overall light transmission.
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 design prevents or reduces the decrease in aperture ratio and enhances process efficiency by optimizing the repair process, allowing for higher transmittance and lower power consumption.
Implementation Method 1
The upper wiring layer has an energy absorption rate higher than the lower wiring layer
Implementation Method 2
The lower wiring layer and the upper wiring layer have a transmittance higher than the lower electrode
Data Source
AI summary
A display apparatus includes a plurality of pixel areas. The repair wiring may include a first repair wiring in each pixel area and a second repair wiring extending beyond the corresponding pixel area. The first repair wiring of each pixel area may cross a repair cutting region of the corresponding pixel area. The second repair wiring may include a region overlapping with a repair connecting region of one of adjacent two pixel areas. Each of the first repair wiring and the second repair wiring may have a stacked structure of a lower wiring layer and an upper wiring layer. The lower wiring layer and the upper wiring layer may have a relative high transmittance. The upper wiring layer may have an energy absorption rate higher than the lower wiring layer. The upper wiring layer of the first repair wiring may be disposed outside the repair cutting region. Thus, in the display apparatus, a decrease in aperture ratio due to the first repair wiring and the second repair wiring may be prevented, without a decrease in process efficiency.