Display Substrate Redundant Signal Circuits and ESD Protection
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Solution Overview
Problem
The manufacturing process of micro inorganic light emitting diode display substrates is complicated, leading to electrostatic discharge (ESD) issues, which can cause transistor channel breakdown and result in display defects such as point, line, or area defects.
Innovation Solution
A display substrate design that includes a base substrate with pixel units, signal lines, and signal supply modules featuring a signal supply circuit and a redundant signal supply circuit, along with electrostatic ring structures and protection resistors to mitigate ESD effects, ensuring continuous signal supply even if one circuit fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If micro inorganic light emitting diodes are formed on the display substrate by a transfer printing method, then higher brightness and better luminous efficiency are achieved, but large electrostatic discharge (ESD) occurs during manufacturing
Solution Approach 1:
The patent introduces electrostatic ring structures and protection resistors before the actual ESD events occur during manufacturing. These protective elements are pre-built into the display substrate to cushion and dissipate electrostatic charges before they can cause harmful discharges to the pixel units, thereby resolving the contradiction between achieving high brightness through transfer printing and preventing ESD damage during the manufacturing process
2Loss of energy
If a complicated manufacturing process is used to form micro inorganic light emitting diodes, then higher luminous efficiency is achieved, but manufacturing yield decreases due to ESD
Solution Approach 1:
The patent implements protective structures (electrostatic rings and protection resistors) in advance during the manufacturing process. These structures are designed to dissipate electrostatic charges before they can cause breakdown, thereby maintaining high manufacturing yield while allowing the use of complicated transfer printing processes that achieve high luminous efficiency
Solution Approach 2:
The electrostatic ring structures and protection resistors act as intermediary elements between the complicated manufacturing process and the final product. These intermediaries absorb and dissipate electrostatic energy, mediating the conflict between using advanced manufacturing techniques for high efficiency and maintaining manufacturing yield by preventing ESD-related defects
3Reliability
If redundant signal supply circuits are added to provide backup signal paths, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent adds redundant signal supply circuits and electrostatic protection structures beforehand to cushion against potential failures. These redundant paths are prepared in advance to take over if the primary signal paths fail due to ESD, thereby improving reliability while accepting the necessary increase in device complexity
Solution Approach 2:
The patent changes the system configuration by introducing redundant signal supply circuits and electrostatic protection elements. This parameter change from a single-path to a multi-path system increases reliability but also increases device complexity, resolving the contradiction by deliberately adjusting the system parameters to prioritize reliability
Data Source
AI summary
The present disclosure provides a display substrate and a display device, and belongs to the field of display technology. The display substrate of the present disclosure includes: a base substrate; and a plurality of pixel units arranged in an array, a plurality of signal lines and signal supply modules on the base substrate; wherein the signal supply module includes: a signal supply circuit and a redundant signal supply circuit; each of the signal supply modules is electrically coupled to at least one of the plurality of pixel units through at least one of the plurality of signal lines.