Display Device Read-Out Line Signal Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration of a scanning function in display devices leads to signal distortion in pad lines due to unnecessary parasitic capacitors and signal coupling defects, which hinders the accuracy of the scanning function.
Innovation Solution
A display device design that includes a substrate with a main region for image display and a sub-region with a bending region, where the circuit layer is arranged to have read-out lines adjacent to each other without data lines in between, and DC power supply lines overlapping read-out lines to stabilize light sensing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the second sub-region has a limited width to accommodate both display driving circuit and scanning driving circuit, then device area is reduced, but pad lines connected to scanning driving circuit overlap with pad lines connected to display driving circuit causing parasitic capacitors and signal coupling defects
Solution Approach 1:
The patent divides the pad line groups into separate categories: first pad line groups connected to the display driving circuit and second pad line groups connected to the scanning driving circuit. By spatially separating these pad line groups within the limited second sub-region, the invention prevents overlap between different signal types, thereby reducing parasitic capacitors and signal coupling defects while maintaining compact device area.
2Reliability
If read-out lines are arranged adjacent to each other without data lines in between in the bending region, then signal distortion in pad lines is reduced, but layout complexity increases
Solution Approach 1:
The patent utilizes the third dimension (vertical stacking) by forming read-out lines and data lines in different layers. Specifically, read-out lines are formed in a first conductive layer while data lines are formed in a second conductive layer above it. This layered arrangement allows read-out lines to be adjacent without data lines in between in the planar view, reducing signal distortion, while the vertical separation manages the layout complexity systematically.
3Reliability
If DC power supply lines overlap read-out lines in the bending region, then light sensing signals are stabilized, but parasitic coupling may increase
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the DC power supply lines and read-out lines in the bending region. The read-out lines are formed in a first conductive layer, while DC power supply lines are formed in a second conductive layer separated by an insulating layer. This intermediary structure allows the lines to overlap for signal stability while preventing direct parasitic coupling through the insulating barrier.
Data Source
AI summary
There are provided a display device and an electronic device. The display device comprises a substrate, a circuit layer, and an element layer. A sub-region of the substrate comprises a bending region. A display area of the substrate comprises emission areas, a non-emission area between the emission areas, and light sensing areas in portions of the non-emission area. The element layer comprises light emitting elements in the emission areas, and light sensing elements in the light sensing areas. The circuit layer comprises data bending lines disposed in the bending region and electrically connected to data lines; and read-out bending lines disposed in the bending region and electrically connected to read-out lines. The bending region comprises first wiring group areas in which two or more of the data bending lines are disposed; and second wiring group areas in which two or more of the read-out bending lines are disposed.