Display Substrate Corner Test Unit Layout for Narrow Bezel
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Solution Overview
Problem
The existing display technologies face challenges in simplifying the structure of driver chips and detection devices, leading to an increased width of the peripheral region and bezel of display devices, which hinders the realization of a narrow bezel design and improved screen-to-body ratio.
Innovation Solution
A display substrate design that includes a base substrate with a display region and a peripheral region, featuring sub-pixels, data lines, test units, test signal lines, and multiplexing units, which allows for the efficient transmission of signals and reduces the width of the bezel by optimizing the layout of test units and multiplexing units in the peripheral region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driver units or driver circuits are directly provided on the display substrate to simplify structures, then the structure of driver chips and detection devices is simplified, but the width of the peripheral region and bezel increases
Solution Approach 1:
The patent utilizes the corner regions of the display substrate by arranging test units and multiplexing units along the diagonal direction from corners toward edge centers. This diagonal arrangement effectively uses the two-dimensional space in corner regions that would otherwise be wasted, allowing signal transmission lines to extend from corners to edges without increasing the peripheral region width, thus resolving the contradiction between simplifying driver chip structure and maintaining compact bezel width.
2Reliability
If test units and multiplexing units are arranged in the peripheral region, then signal transmission is improved, but the occupied area increases
Solution Approach 1:
The patent divides the peripheral region into functionally independent segments: test units are arranged in corner regions while multiplexing units are arranged in edge center regions. This segmentation allows each unit type to be optimally positioned in its designated zone, enabling signal transmission functionality without requiring continuous large-area occupation, thus resolving the contradiction between improving signal transmission and reducing occupied area.
Solution Approach 2:
The patent applies different arrangement strategies to different locations: test units are concentrated in corner regions where space is otherwise underutilized, while multiplexing units are placed in edge center regions. This localized optimization ensures that each functional unit occupies the most appropriate space, improving signal transmission reliability without unnecessarily increasing the total occupied area of the peripheral region.
Data Source
AI summary
A display substrate includes: a base substrate having a display region and a peripheral region surrounding the display region; a plurality of sub-pixels in the display region; a plurality of data lines in the display region, electrically coupled to the plurality of sub-pixels respectively, and configured to provide a data signal to the plurality of sub-pixels respectively; a plurality of pads in the peripheral region, wherein at least a portion of the plurality of pads are configured to provide a data signal to the plurality of data lines respectively; at least one test data signal line in the peripheral region; at least one test control signal line in the peripheral region; and a plurality of test units in the peripheral region and on a side of the plurality of pads away from the display region.