GOA Circuit Segmentation for LCD Tri-gate Color Shift
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Solution Overview
Problem
The 'Tri-gate' method in LCD manufacturing, which reduces costs by rotating pixels and increasing gate lines, leads to significant RC delay and color shift issues at the panel edges due to distorted data signals, resulting in inadequate charging and color tone distortions.
Innovation Solution
A Gate driver On Array (GOA) circuit is designed with cascaded units including clock, pull-down, bootstrap capacitor, pull-up, and pull-down sustain circuits, replacing traditional gate chips to improve signal integrity and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the Tri-gate method is used to reduce data chip usage and manufacturing cost, then manufacturing cost decreases, but RC delay increases and signal distortion occurs at panel edges
Solution Approach 1:
The gate driver function is segmented into multiple GOA units distributed across different gate lines. Each GOA unit independently drives a specific gate line, dividing the long wiring path into shorter segments. This segmentation reduces the RC delay impact on any single path and improves signal integrity at panel edges while maintaining the cost benefits of the Tri-gate method.
2Quantity of substance
If gate lines are tripled in the Tri-gate method, then the number of data lines is reduced to one-third, but wirings in the fanout region are lengthened and RC delay becomes more serious
Solution Approach 1:
The patent introduces a multi-level hierarchical structure where GOA units are organized across multiple gate line levels. This dimensional organization allows data signals to be distributed more efficiently through the gate lines, reducing the effective wiring length that signals must traverse while maintaining the reduced data line count benefit of the Tri-gate method.
3Area of stationary object
If data signals are transmitted over long wirings in fanout region, then panel coverage is improved, but data signals at two edges of panel are distorted due to greatest RC delay
Solution Approach 1:
GOA units serve as intermediary components between the data chip and the pixel columns at panel edges. Each GOA unit receives data signals and regenerates/boosts them before distributing to gate lines, acting as a signal intermediary that compensates for RC delay effects. This ensures uniform signal quality across the entire panel coverage area.
4Ease of operation
If traditional gate chips are used, then driving function is provided, but manufacturing cost is higher and integration density is lower
Solution Approach 1:
The patent merges the gate driver functionality directly into the array structure through GOA units that are integrated with the pixel circuitry. This merging eliminates the need for separate gate chips, reducing manufacturing cost and increasing integration density while maintaining full driving functionality for all pixel columns.
Data Source
AI summary
A GOA (Gate driver On Array) for an LCD (Liquid Crystal Display) device is disclosed herein. The LCD device comprises a plurality of scanning lines. The GOA circuit comprises a plurality of GOA units, which are cascaded with each other as a plurality of level GOA units. The (n)th level GOA unit comprises a clock circuit, a pull-down circuit, a bootstrap capacitor circuit, a pull-up circuit, and a pull-down sustain circuit, to improve the color shift issue of a Tri-gate.