Display Device Common Layer Segmentation for Leakage Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in enhancing the sensing performance of biometric information recognition, particularly in preventing current leakage in light receiving elements while maintaining electrical connectivity with light emitting elements.
Innovation Solution
A display device structure featuring a base layer, circuit layer, and element layer with a pixel definition layer, a disconnected spacer layer, and a common layer that is partially disconnected around light receiving elements to prevent current leakage, allowing for improved biometric information sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common layer is provided to electrically connect light receiving elements with light emitting elements, then electrical connectivity is improved, but current leakage increases
Solution Approach 1:
The common layer is segmented into two distinct regions: a first common layer region that electrically connects the light receiving element with light emitting elements, and a second common layer region that is disposed apart from the light receiving element. This segmentation allows the common layer to provide necessary electrical connectivity while preventing current leakage to the light receiving element by creating an isolated region.
Solution Approach 2:
Different regions of the common layer are given different functional qualities: the first common layer region has high electrical conductivity for connecting elements, while the second common layer region has reduced electrical conductivity or is electrically isolated from the light receiving element to prevent current leakage. This local differentiation of electrical properties resolves the contradiction between connectivity and leakage prevention.
2Object-generated harmful factors
If the common layer is completely disconnected around light receiving elements, then current leakage is prevented, but electrical connectivity with light emitting elements is lost
Solution Approach 1:
The common layer is divided into functionally distinct segments: a first common layer region that maintains electrical connection between light receiving and light emitting elements, and a second common layer region that is spatially separated and electrically isolated from the light receiving element. This segmentation enables simultaneous achievement of connectivity and leakage prevention.
Solution Approach 2:
The harmful function of the common layer (current leakage path) is extracted by creating a second common layer region that is disposed apart from and electrically isolated from the light receiving element, while retaining the useful function (electrical connectivity) through the first common layer region that connects light receiving and light emitting elements.
3Object-generated harmful factors
If a disconnected spacer layer is introduced to prevent current leakage, then current leakage is reduced, but device complexity increases
Solution Approach 1:
The disconnected spacer layer serves multiple functions simultaneously: it provides physical spacing between layers, defines the boundary for the first common layer region, and acts as an electrical isolation structure to prevent current leakage. By combining multiple functions into a single structural element, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity.
Data Source
AI summary
A display device includes: a base layer; a circuit layer on the base layer; and an element layer on the circuit layer and comprising a plurality of light emitting elements and a plurality of light receiving elements, the element layer including: a pixel definition layer having a light emitting opening defined therethrough to correspond to the light emitting elements and a light receiving opening defined therethrough to correspond to the light receiving elements; a disconnected spacer layer adjacent to the light receiving opening on the pixel definition layer; and a common layer commonly in the light emitting elements and the light receiving elements and partially disconnected around the light receiving elements due to the disconnected spacer layer.