Touch Display FPCB Overlap Reduces Non-Display Region
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices with touch screen panels require separate manufacturing and connection of display and touch screen panels, leading to increased size and complexity due to the need for driving circuits and flexible printed circuit boards (FPCBs), which results in a larger non-display region and reduced compactness.
Innovation Solution
A display device design featuring a main flexible printed circuit board (FPCB) with opposing connecting portions and touch driving circuits, which connects and drives both top and bottom touch sensing members, reducing the width of the FPCB and minimizing the non-display region by overlapping touch driving circuits with connecting portions, and allowing for connection via compression or connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate driving circuits and FPCBs are used for display panel and touch screen panel, then touch sensing functionality is achieved, but the non-display region size increases and compactness decreases
Solution Approach 1:
The patent combines the display panel and touch screen panel into a single integrated structure where the touch sensing members are disposed on the display panel itself. The driving circuits are integrated onto the same FPCB that connects to the display panel, eliminating the need for separate FPCBs and reducing the non-display region size while maintaining full touch sensing functionality.
2Adaptability or versatility
If multiple separate FPCBs and driving circuits are used, then complete touch driving capability is achieved, but device complexity increases
Solution Approach 1:
The single FPCB in the patent serves multiple functions: it connects to the display panel, provides driving signals for both the display and touch sensing operations, and integrates both display driving circuits and touch driving circuits on the same board. This multi-functional design reduces device complexity while maintaining complete touch driving capability.
3Ease of operation
If FPCB width is increased to accommodate driving circuits, then circuit functionality is maintained, but the overall device size increases
Solution Approach 1:
The patent resolves the space constraint by moving the driving circuits from a lateral arrangement (increasing FPCB width) to an overlapping arrangement where circuits are positioned above or below connecting portions in the vertical dimension. This dimensional reorganization maintains circuit functionality while minimizing the horizontal footprint of the FPCB.
Data Source
AI summary
A display device may include a first touch sensing member on a top surface of a display panel, a second touch sensing member on a bottom surface of the display panel, a main FPCB coupled to the display panel and including first and second connecting portions, a first touch FPCB connected to the first touch sensing member and the first connecting portion, a second touch FPCB connected to the second touch sensing member and the second connecting portion, a first touch driving circuit on the first touch FPCB, and a second touch driving circuit on the second touch FPCB. The first touch driving circuit and the first connecting portion may be positioned opposite to each other with respect to the main FPCB. The second touch driving circuit and the second connecting portion may be positioned opposite to each other with respect to the main FPCB.