Electrophoretic Display Gate Control Without Driving ICs
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Solution Overview
Problem
Existing electrophoretic displays face challenges in reducing the cost and yield loss due to the use of gate driving ICs, which are bonded to flexible substrates through chip on film packages, and the hot pressing process complicates the manufacturing process, increasing costs and reducing overall yield.
Innovation Solution
The electrophoretic display incorporates a gate control circuit with low conduction resistive thin film transistors and a simplified gate driving mechanism, reducing the number of connection lines and eliminating the need for gate driving ICs, utilizing a flexible circuit board with integrated control circuits to manage gate and data signals efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate driving ICs are used to control the pixel control array, then the display can be driven with sufficient signal strength, but the manufacturing cost increases and yield loss occurs due to the chip on film package process and hot pressing
Solution Approach 1:
The invention extracts and removes the gate driving ICs from the system by integrating the gate driving functionality directly into the display structure through low conduction resistive thin film transistors formed on the same substrate, eliminating the need for separate driving ICs and their associated packaging and bonding processes
Solution Approach 2:
The invention merges the gate driving function with the display substrate by forming low conduction resistive thin film transistors on the same substrate as the pixel control array, combining what were previously separate components (driving ICs and display panel) into a single integrated structure
2Ease of operation
If multiple gate driving ICs are bonded to flexible substrate through chip on film package, then sufficient gate driving signals can be supplied, but the process complexity increases and overall yield decreases
Solution Approach 1:
The invention enables the display substrate to serve itself by forming low conduction resistive thin film transistors directly on the substrate that generate and supply the gate driving signals internally, eliminating the need for external gate driving ICs and their complex bonding processes
Solution Approach 2:
The low conduction resistive thin film transistors perform multiple functions: they act as switching elements for pixel control and simultaneously serve as gate driving signal sources, replacing what were previously separate functions performed by external driving ICs
3Reliability
If hot pressing process is used between driving module and electrophoretic display, then electrical connection is achieved, but manufacturing cost increases and yield is reduced
Solution Approach 1:
The invention extracts and eliminates the hot pressing process by forming direct electrical connections through the low conduction resistive thin film transistors on the same substrate, removing the need for separate driving modules and their associated thermal bonding processes
Data Source
AI summary
An electrophoresis display includes a pixel control array including pixel units, a gate control circuit electrically connected to the pixel control array. The gate control circuit includes a plurality of gate driving circuit sets, one of the gate driving circuit sets includes a plurality of gate driving circuits. One of the gate driving circuits includes gate thin film transistor where an output of one gate driving circuit is electrically connected to a gate line of the pixel control array, a plurality of control signal lines where one of the control signal lines is connected to an input of one of the gate driving circuits of one gate driving circuit set, a plurality of gate driving circuit set enable lines where one of the gate driving circuit set enable lines is connected to the enable control points of the gate driving circuits of each gate driving circuit set.