Display Pixel Line Layout for Low-Capacitance Light Sensing
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Solution Overview
Problem
Existing display devices face challenges in improving reliability and integrating light-sensing capabilities with display functionality, particularly in terms of reducing coupling capacitance and optimizing signal routing for enhanced performance.
Innovation Solution
The display device incorporates a specific layout of data lines, readout lines, and reset lines, including overlapping sub-lines to shield capacitance, with light-sensing pixels between sub-pixels, and a sensor circuit, all at the same layer, to enhance signal integrity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light-sensing pixels are integrated between sub-pixels with data lines and readout lines at the same layer, then biometric sensing capability is enhanced, but coupling capacitance between lines increases
Solution Approach 1:
A shielding line is introduced as an intermediary element between the data lines and readout lines. This shielding line acts as a mediator that blocks or reduces the capacitive coupling between adjacent signal lines, thereby maintaining signal integrity while allowing the integrated layout of light-sensing pixels between sub-pixels
Solution Approach 2:
The shielding function is extracted as a separate dedicated line rather than being integrated into the existing data or readout lines. This separate shielding line can be independently optimized for its noise-reduction function while the other lines maintain their signal transmission functions
2Area of stationary object
If data lines and readout lines are routed closely together to save space, then device area is reduced, but coupling capacitance between lines increases
Solution Approach 1:
The shielding line serves as a space-efficient intermediary that allows close routing of data and readout lines while maintaining signal integrity. The shielding line fits within the existing pixel structure between sub-pixels, providing capacitance reduction without significantly increasing the overall device area
3Ease of manufacture
If multiple lines are placed at the same layer for simplified manufacturing, then manufacturing complexity is reduced, but coupling capacitance between lines increases
Solution Approach 1:
The shielding line is manufactured at the same layer as the data and readout lines using the same patterning and deposition processes. This maintains manufacturing simplicity while the shielding line's presence physically blocks capacitive coupling between adjacent signal lines, improving signal integrity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces coupling capacitance and improves signal routing, leading to enhanced reliability and performance of both display and light-sensing functions, enabling improved biometric sensing capabilities.
Implementation Method 1
The first sub-line may be configured to shield a coupling capacitance between the horizontal bridge line and the readout line in the overlap area
Data Source
AI summary
A display device according to one or more embodiments may include a substrate, first sub-pixels, second sub-pixels, and third sub-pixels respectively arranged in a first pixel row and a second pixel row extending in a first direction, light-sensing pixels between respective ones of the second sub-pixels and the third sub-pixels in the first pixel row and the second pixel row, and including a sensor circuit, a first data line electrically connected to the second sub-pixels, a second data line electrically connected to the third sub-pixels, and a readout line electrically connected to the light-sensing pixels, between the first data line and the second data line in plan view, adjacent to one of the first data line or the second data line in the first pixel row, and adjacent to a remaining one of the first data line or the second data line in the second pixel row.