Display Substrate Inspection Circuit Integration for Flexible PCB Width Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices with flexible printed circuit boards require significant space for connecting circuit units to apply off bias voltage to inspection circuit units, limiting the miniaturization of the flexible printed circuit board.
Innovation Solution
The connecting circuit unit for applying off bias voltage is integrated into the display substrate rather than the flexible printed circuit board, allowing the flexible printed circuit board to be narrower by relocating the power and inspection lines within the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connecting circuit unit is mounted on the flexible printed circuit board to apply off bias voltage to the inspection circuit unit, then the inspection function is maintained, but the width of the flexible printed circuit board increases
Solution Approach 1:
The connecting circuit unit is extracted from the flexible printed circuit board and relocated to the display substrate. This extraction removes the space requirement for the connecting circuit unit from the flexible printed circuit board, enabling width reduction while maintaining the inspection function through the relocated circuit unit on the display substrate.
Solution Approach 2:
The circuit unit is relocated from one substrate (flexible printed circuit board) to another substrate (display substrate), effectively moving the functional element to a different dimensional plane. This relocation allows the flexible printed circuit board to be narrowed while the display substrate accommodates the circuit unit in its non-display area.
2Volume of moving object
If the flexible printed circuit board is narrowed to reduce device size, then compactness is improved, but the space for connecting circuit unit becomes insufficient
Solution Approach 1:
The connecting circuit unit is merged with the display substrate, combining two previously separate functional elements (display substrate and connecting circuit unit) into a single integrated structure. This merging eliminates the need for separate space allocation on the flexible printed circuit board, enabling overall device compactness while maintaining all necessary functions.
Solution Approach 2:
The display substrate is given multi-functionality by incorporating both display functions and the connecting circuit unit functions. This universal design allows the display substrate to serve dual purposes, eliminating the need for additional dedicated space on the flexible printed circuit board for the connecting circuit unit.
3Length of moving object
If the connecting circuit unit is integrated into the display substrate, then the flexible printed circuit board width is reduced, but the inspection circuit unit connectivity must be maintained
Solution Approach 1:
The display substrate acts as an intermediary carrier for the connecting circuit unit, mediating the connection between the flexible printed circuit board and the inspection circuit unit. The connecting circuit unit on the display substrate receives signals from the flexible printed circuit board and transmits them to the inspection circuit unit, maintaining connectivity while enabling flexible printed circuit board width reduction.
Data Source
AI summary
A display device includes a display unit including pixels in an area defined by a plurality of scan lines and a plurality of data lines, a scan driving unit configured to apply a plurality of scan signals to the scan lines, a data driving unit configured to apply a plurality of data signals to the data lines, an inspection circuit unit configured to apply a plurality of inspection signals to the data lines, a plurality of inspection pads configured to transmit a plurality of inspection control signals to the inspection circuit unit, a plurality of first inspection lines electrically connecting the inspection circuit unit to the inspection pads, and a plurality of second inspection lines branching off from the first inspection lines and electrically connecting the inspection circuit unit to the data driving unit.