Display Device Reset Voltage Reinforcement Wiring
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Solution Overview
Problem
Current display devices face challenges in enhancing the sensing performance for biometric information recognition, particularly in providing uniform and efficient sensing across the active area.
Innovation Solution
The display device incorporates a circuit layer with defined active and peripheral areas, including reset voltage reinforcement wiring, initialization voltage reinforcement wiring, and reset control reinforcement wiring, which ensures uniform sensing performance by minimizing voltage drops and load differences across the active area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reset voltage wirings are provided only in the active area, then the device complexity is reduced, but the sensing performance uniformity deteriorates due to voltage drops and load differences
Solution Approach 1:
The reset voltage wirings are segmented into two types: those disposed in the active area and those disposed in the peripheral area. This segmentation allows the peripheral area wirings to compensate for voltage drops in the active area without increasing the complexity within the active area itself, thereby maintaining sensing performance uniformity while managing device complexity.
Solution Approach 2:
The solution moves the additional wiring from the active area to the peripheral area, effectively using another dimension (spatial redistribution) to solve the voltage drop problem. The reset voltage reinforcement wirings in the peripheral area extend toward the active area, providing voltage compensation without adding complexity to the active area wiring structure.
2Measurement precision
If the sensing area is extended to improve biometric recognition, then the measurement precision is improved, but the voltage drop increases causing non-uniform sensing performance
Solution Approach 1:
The reset voltage reinforcement wirings act as intermediaries that compensate for voltage drops caused by extended sensing areas. These additional wirings provide supplementary reset voltage paths that maintain uniform voltage levels across the extended active area, enabling improved biometric sensing accuracy without sacrificing performance uniformity.
3Reliability
If more reset voltage wirings are added to compensate for voltage drops, then the sensing performance uniformity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The reset voltage reinforcement wirings are specifically disposed in the peripheral area where they can provide voltage compensation without requiring precise alignment with the pixel circuits in the active area. This local placement strategy reduces manufacturing precision requirements compared to adding wirings directly within the active area.
Data Source
AI summary
A display device in which an active area and a peripheral area adjacent to the active area are defined includes a base layer, a circuit layer disposed on the base layer, and an element layer disposed on the circuit layer and including a light emitting element and a light receiving element. The circuit layer includes a pixel driving circuit connected to the light emitting element, a sensor driving circuit connected to the light receiving element, a plurality of reset voltage wirings disposed in the active area and that provide a reset voltage to the sensor driving circuit, and a reset voltage reinforcement wiring disposed in the peripheral area, connected to the plurality of reset voltage wirings, and extending in a first direction.