Display Substrate Initialization Bus Layout for High-Resolution OLED Pixels
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Solution Overview
Problem
The complexity of display products necessitates improved layout of signal lines to reduce loading, difficulty, and ensure signal transmission stability, particularly in high-resolution organic light-emitting diode displays with small sub-pixels.
Innovation Solution
A display substrate design with a first initialization signal transmission layer comprising a first initialization bus and branches that couple to sub-pixel driving circuitries in column and row units, optimizing branch layout and reducing loading to ensure uniform voltage and signal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sub-pixel size is reduced to achieve high resolution (400-500 ppi), then the resolution is improved, but the sub-pixel driving circuit layout becomes more complex and signal transmission stability deteriorates
Solution Approach 1:
The patent divides the initialization signal transmission network into a hierarchical structure with initialization buses and initialization branches. The initialization bus extends along the first direction to cover multiple column units, while initialization branches extend along the second direction to reach specific sub-pixel driving circuits. This segmentation allows efficient signal distribution across the high-resolution display without requiring complex individual routing for each sub-pixel.
Solution Approach 2:
The patent employs a two-dimensional grid-like initialization signal transmission structure where initialization buses extend in the first direction (row-wise) and initialization branches extend in the second direction (column-wise). This dimensional approach allows the signal transmission network to efficiently cover the high-resolution display array without increasing routing complexity, as the orthogonal arrangement provides systematic coverage of all sub-pixels.
2Reliability
If the sub-pixel driving circuit design is made more complex to improve hysteresis and flickering, then the display quality is improved, but the layout difficulty and loading increase
Solution Approach 1:
The patent segments the initialization signal transmission into modular bus and branch structures that can be systematically replicated across column units. Each initialization branch serves a specific group of sub-pixel driving circuits in a column unit, allowing for standardized manufacturing processes and reduced layout difficulty despite the complex sub-pixel driving circuit designs required for hysteresis and flickering compensation.
Solution Approach 2:
The patent extends the initialization bus along the first direction to cover multiple column units beyond what might be minimally required. This excessive coverage ensures that all sub-pixel driving circuits, including those with complex designs for hysteresis and flickering compensation, receive stable initialization signals without requiring precise optimization of each individual branch length, thereby simplifying the manufacturing process.
3Area of stationary object
If the initialization signal transmission network is extended to cover all sub-pixels in high-resolution displays, then the signal coverage is improved, but the loading and layout complexity increase
Solution Approach 1:
The patent employs a two-dimensional orthogonal grid structure where initialization buses extend along the first direction and initialization branches extend along the second direction. This dimensional approach allows comprehensive coverage of the high-resolution display area without requiring a proportional increase in the number of signal lines, as the orthogonal arrangement provides systematic and efficient spatial utilization.
Solution Approach 2:
The initialization bus structure serves multiple column units simultaneously by extending along the first direction, while initialization branches serve multiple sub-pixel driving circuits within each column unit by extending along the second direction. This multi-functional design allows a single bus-branch configuration to cover extensive display areas, reducing the overall network complexity despite the large coverage area required for high-resolution displays.
Data Source
AI summary
A display substrate and a display device. The display substrate includes a base substrate and a plurality of sub-pixels arranged on the base substrate. A plurality of sub-pixel driving circuitries in the plurality of sub-pixels is arranged in columns, the columns of sub-pixel driving circuitries are divided into a plurality of column units, and each column unit includes at least two adjacent columns of sub-pixel driving circuitries. The display substrate further includes a first initialization signal transmission layer including a first initialization bus and a plurality of first initialization branches. The first initialization branch includes a first branch body member and a plurality of first branch extending members. The first branch body member is coupled to the sub-pixel driving circuitries in a corresponding column unit through the plurality of first branch extending members.