Display Substrate Scanning Layout for High-Refresh Large Panels
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Solution Overview
Problem
Medium-sized and large-sized display products face challenges in achieving high refresh rates due to load limitations.
Innovation Solution
A display substrate design with a specific arrangement of scanning lines, signal lines, and transistors, including a 2T1C pixel driving circuit, allows for efficient signal transmission and voltage distribution, enabling high refresh rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional scanning line arrangements are used in medium-sized and large-sized displays, then the device can be manufactured with standard layouts, but the refresh rate is limited due to large load
Solution Approach 1:
The display screen is divided into multiple display regions, with each region having its own independent scanning lines. This segmentation allows each region to be driven independently, reducing the load on individual scanning lines and enabling high refresh rates in medium-sized and large-sized displays without overwhelming the system capacity.
Solution Approach 2:
Scanning lines are arranged in both first direction (horizontal) and second direction (vertical), creating a two-dimensional scanning line network. This multi-directional arrangement distributes the scanning load across multiple paths, reducing the burden on any single scanning line while maintaining comprehensive pixel coverage.
2Reliability
If scanning lines are arranged to cover all pixels, then all pixels can be refreshed, but voltage drop increases in medium-sized and large-sized displays
Solution Approach 1:
The display is segmented into multiple regions, each with dedicated scanning lines. This reduces the total length of individual scanning lines, thereby minimizing voltage drop across each segment while ensuring all pixels receive adequate voltage for uniform image quality.
Solution Approach 2:
By introducing scanning lines in both horizontal and vertical directions, the voltage distribution path is shortened and diversified. Pixels can be reached through multiple scanning line paths, reducing the cumulative voltage drop that would occur in long single-direction scanning lines.
3Productivity
If more scanning lines are added to increase refresh rate, then more pixels can be refreshed simultaneously, but the device complexity and load increase
Solution Approach 1:
Instead of adding numerous scanning lines across the entire display, the screen is divided into regions with fewer scanning lines per region. This segmentation achieves high refresh rate capability through parallel regional processing while keeping the number of scanning lines in each region manageable, thus controlling overall device complexity.
Solution Approach 2:
By arranging scanning lines in both first and second directions, the scanning coverage is achieved through a grid-like structure rather than requiring excessive lines in a single direction. This multi-dimensional arrangement reduces the total number of scanning lines needed while maintaining comprehensive pixel access capability.
Data Source
AI summary
A display substrate and a display device. The display substrate includes a driving circuit layer, a first scanning line and a second scanning line. The driving circuit layer includes pixel units arranged in an array form, each pixel unit includes a plurality of sub-pixels, at least one sub-pixel includes a pixel driving circuit, the pixel driving circuit includes a first transistor and a second transistor, an active pattern of the first transistor includes a first channel region, an active pattern of the second transistor includes a second channel region, the first channel region is located on a side of the first scanning line away from the second scanning line, and the second channel region is located on a side of the second scanning line away from the first scanning line.