Biometric Display Circuit Layout With Shielded Sensor Readout
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Solution Overview
Problem
Existing display devices face challenges in achieving improved biometric information recognition performance, particularly in integrating biometric sensors with display elements without compromising display quality or functionality.
Innovation Solution
The display device incorporates a circuit layer with pixel drive circuits and sensor drive circuits, featuring shielding electrodes, readout wirings, and connecting electrodes, with specific layering and insulation configurations to enhance biometric information recognition while maintaining display performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If biometric sensors are integrated with display elements in the same layer, then device complexity is reduced, but interference between display and sensor elements increases
Solution Approach 1:
The patent transitions from planar integration to three-dimensional stacking, placing display elements and sensor elements in different vertical layers (first planar region and second planar region at different heights). This spatial separation in the vertical dimension eliminates interference while maintaining integration, as signals from display pixels and sensor pixels operate in distinct spatial domains without mutual interference.
Solution Approach 2:
The patent implements a nested structure where multiple functional layers are stacked within each other vertically. The circuit layer with pixel circuits is positioned at a first height, while the sensor layer with light receiving elements is positioned at a second height, creating a nested three-dimensional integration where display and sensor functions coexist in a compact vertical arrangement without lateral interference.
2Measurement precision
If shielding electrodes are added to reduce interference, then biometric information recognition accuracy improves, but device complexity increases
Solution Approach 1:
The patent extracts the shielding function from the main circuit layer by implementing a separate dedicated shielding layer positioned between the display element layer and sensor element layer. This separate shielding layer (with shielding electrodes patterned to match pixel arrangements) isolates sensor signals from display signal interference without complicating the circuit layer itself, as the shielding function is implemented in a distinct structural layer.
3Object-affected harmful factors
If multiple intermediate insulating layers are used for proper layering, then interference between elements is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent segments the insulating structure into multiple functional intermediate insulating layers positioned between different element layers and circuit layers. Each intermediate insulating layer serves a specific isolation function (electrical insulation, mechanical support, stress relief), allowing systematic manufacturing through sequential deposition processes while achieving comprehensive interference reduction between display and sensor elements.
Data Source
AI summary
A display device includes a base layer having a display region and a non-display region defined therein; a circuit layer on the base layer; and an element layer on the circuit layer, the element layer comprising light emitting elements and light receiving elements corresponding in position to the display region. The circuit layer comprises: pixel drive circuits connected to the light emitting elements; sensor drive circuits connected to the light receiving elements; data lines connected to the pixel drive circuits; readout wirings connected to the sensor drive circuits; a shielding electrode overlapping with the readout wirings and the sensor drive circuits in a plan view, the shielding electrode being on the data lines; and pixel connecting electrodes connecting the pixel drive circuits to the light emitting elements, the pixel connecting electrodes being at a same layer as the shielding electrode.