Display Apparatus With Stacked Emission And Sensing Elements
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving high-resolution image display while maintaining efficient manufacturing processes.
Innovation Solution
A display apparatus is designed with a substrate having emission and sensing areas, featuring a light-emitting element and a light-receiving element at different layers, along with a lower and upper bank layer structure that includes conductive layers for independent driving of emission and sensing circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light-emitting elements and light-receiving elements are integrated in the same layer, then device complexity is reduced, but manufacturing precision and resolution are compromised
Solution Approach 1:
The patent transitions from planar integration to three-dimensional stacking by placing light-emitting elements and light-receiving elements in different layers (first and second layers). This vertical arrangement in the depth dimension allows both element types to coexist without lateral interference, maintaining high resolution while reducing overall device footprint and complexity.
2Manufacturing precision
If separate masks are used for depositing emission and opposite electrodes, then manufacturing precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the deposition of emission electrodes and opposite electrodes into a single simultaneous process using one mask. This merging of operations eliminates the need for separate masking steps, reducing manufacturing complexity and cost while maintaining the required precision through controlled deposition parameters and proper mask design.
Solution Approach 2:
The single mask structure serves multiple functions by defining both emission electrode patterns and opposite electrode patterns simultaneously. This universal mask design enables one-step deposition of multiple electrode types, streamlining the manufacturing process while ensuring precise electrode placement through careful mask fabrication and alignment procedures.
3Device complexity
If emission and sensing circuits share the same driving structure, then device complexity is reduced, but reliability and independent control are compromised
Solution Approach 1:
The patent divides the driving system into independent emission driving circuits and sensing driving circuits, each with separate control pathways. The emission driving circuit independently controls light-emitting elements while the sensing driving circuit independently controls light-receiving elements, ensuring reliable independent operation without interference between functions.
Data Source
AI summary
A display apparatus includes a substrate including an emission area and a sensing area, a light-emitting element on the substrate and overlapping the emission area, a lower bank layer having a lower opening defining the emission area, the lower bank layer including a first conductive layer and a second conductive layer on the first conductive layer, a light-receiving element on the lower bank layer and overlapping the sensing area, and an upper bank layer including an upper opening defining the sensing area, wherein the light-emitting element and the light-receiving element are located at different layers.