GOA Circuit MLG Function Reduces Feed-Through
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Solution Overview
Problem
The existing Gate Driver On Array (GOA) circuit technology leads to inconsistency in common voltages (Vcom) across different regions of the panel, causing uniformity issues and degrading display quality due to higher feed-through voltage in two-stage drive systems.
Innovation Solution
A new GOA circuit design with cascade-coupled units, incorporating specific thin film transistors and capacitors, and utilizing distinct control and clock signals with different phases and duty ratios to achieve multiple level gate (MLG) functionality, which adjusts chamfered voltage and duration, reducing feed-through and improving Vcom uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two-stage drive system is used in GOA circuit, then circuit structure is simple, but feed-through voltage is high causing Vcom uniformity deterioration
Solution Approach 1:
The drive signal is segmented into multiple levels (first high voltage level VGH1 and second high voltage level VGH2) instead of using a single high voltage level. This segmentation allows different voltage levels to be applied at different time stages, reducing the feed-through effect while maintaining circuit simplicity. The first and second high voltage levels are both higher than the common voltage Vcom, but their staggered application reduces the overall feed-through voltage impact on Vcom uniformity.
Solution Approach 2:
The circuit employs periodic switching between different voltage levels through clock signals CKV1 and CKV2. The first and second high voltage levels are applied in a periodic manner with different timing, creating a multi-level drive waveform. This periodic action with varying voltage levels reduces the feed-through effect compared to a constant two-stage drive, thereby improving Vcom uniformity across the panel.
2Manufacturing precision
If multi-level gate function is implemented, then feed-through is reduced and Vcom uniformity is improved, but circuit complexity increases
Solution Approach 1:
The additional transistors (ninth transistor T9 and tenth transistor T10) serve multiple functions: they control the timing of voltage level transitions, act as switching elements for the multi-level drive, and work with capacitors C1 and C2 to maintain voltage levels. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in circuit complexity while achieving the multi-level gate drive function.
Solution Approach 2:
The circuit merges the voltage level control function with the existing clock signal timing by using the same clock signals CKV1 and CKV2 to control both the original drive transistors and the additional control transistors T9 and T10. This merging of control functions reduces the need for separate control circuits, thereby limiting the increase in overall circuit complexity while still achieving the multi-level drive capability.
Data Source
AI summary
The present invention relates to a GOA circuit. The GOA circuit of the present invention comprises a plurality of GOA circuit units which are cascade coupled, wherein n is set to be a natural number larger than 0, and the nth level GOA circuit unit comprises: a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a fourth thin film transistor (T4), a fifth thin film transistor (T5), a sixth thin film transistor (T6), a seventh thin film transistor (T7), an eighth thin film transistor (T8), a ninth thin film transistor (T9), a tenth thin film transistor (T10), a first capacitor (C1) and a second capacitor (C2). Moreover, two control signals (Select1, Select2) are introduced. The present invention provides a new GOA circuit. The circuit possesses MLG function, which can effectively reduce the feedthrough and improve the Vcom uniformity in the panel to promote the quality of the image display.