Flexible Board Gate Driver Circuit Line Reduction
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Solution Overview
Problem
Organic electroluminescence (EL) displays require a large number of control signal lines and power supply lines, which, when formed on a single-layer flexible board without intersecting, lead to a high risk of short circuits and increased manufacturing costs due to the need for serial connection, reducing yield and increasing costs.
Innovation Solution
The EL display configuration includes a panel board with luminescence elements arranged in a matrix, gate signal lines on a per-pixel basis, and flexible boards with gate driver ICs, source driver circuits, and reduced serial connection lines, connecting control terminals between gate signal output and driver terminals to minimize the number of control lines on the flexible board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If all power supply lines and control signal lines are formed on a single-layer flexible board in serial connection, then the PCB-less configuration is achieved with thin panel, but the line density increases and short circuit risk increases
Solution Approach 1:
The flexible board is divided into multiple wiring layers. Power supply lines are routed on one layer while control signal lines are routed on another layer, allowing simultaneous routing without serial connection. This segmentation of wiring functions reduces line density on each layer and eliminates short circuit risks from line intersections.
2Ease of manufacture
If all power supply lines and control signal lines are formed on a single-layer flexible board in serial connection, then the PCB-less configuration is achieved, but the manufacturing cost increases due to reduced yield
Solution Approach 1:
The wiring layout transitions from a single-layer serial connection to a multi-layer parallel architecture. By adding the vertical dimension (multiple layers), the system can route power supply lines and control signal lines simultaneously without requiring extensive serial connections, thereby reducing manufacturing complexity and improving yield.
3Device complexity
If control terminals are connected between gate signal output terminals and driver terminals, then the number of control lines on flexible board is reduced, but the wiring complexity on the board increases
Solution Approach 1:
Control terminals are merged with existing gate signal output terminals and driver terminals on the flexible board. This consolidation allows control lines to share existing wiring paths, reducing the total number of separate control lines needed while utilizing the multi-layer structure to manage any additional wiring complexity.
Data Source
AI summary
The number of control lines to be formed on a COF in serial connection is reduced. An EL display includes a flexible board including: a plurality of connection terminals arranged at one side for connection with panel lines formed on a panel board; terminal connection lines for connecting points inside the flexible board with the connection terminals; serial connection lines for connecting between two or more of the connection terminals. On the flexible board: driver output terminals of each of gate driver ICs are connected to terminal connection lines; driver input terminals of the gate driver IC are connected to either terminal connection lines or the serial connection lines; and control terminals for performing logic setting of the gate driver IC are each arranged between connection terminals and driver input terminals to which the serial connection lines are connected.