Dual-Gate TFT LCD Panel Wiring for Uniform Brightness
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Solution Overview
Problem
Conventional LCD panels with a gate on array (GOA) circuit experience uneven brightness distribution and visible fringes due to undercharging of pulse signals, as the same data line provides color data to both left and right sub-pixels in the same row, leading to non-uniform brightness.
Innovation Solution
The polarity inversion cycle of the color data output from the source driver is adjusted, and the layout traces in the wiring zone are cross-connected to ensure that each sub-pixel receives color data from a different data line, allowing for sequential and synchronized data transmission to each sub-pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same data line provides color data to both left and right sub-pixels in the same row, then the device complexity is reduced, but the brightness distribution becomes uneven and visible fringes appear
Solution Approach 1:
The patent segments the data line configuration by introducing different data line connections for left and right sub-pixels. Specifically, left sub-pixels are connected to data lines D1-D3 while right sub-pixels are connected to data lines D4-D6, creating separate data transmission paths that enable independent brightness control and eliminate the uniform brightness problem caused by shared data lines
Solution Approach 2:
The patent applies local quality by making different parts of the display (left vs right sub-pixels) have different data line connections and polarity inversion patterns. This localized differentiation allows each region to be optimized independently, with left sub-pixels using one data line configuration and right sub-pixels using another, thereby achieving uniform brightness across the entire display
2Illumination intensity
If the polarity inversion cycle is adjusted and layout traces are cross-connected, then the brightness distribution uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent introduces asymmetry in the wiring zone by implementing cross-connected layout traces where the connection pattern differs systematically between left and right sides. The trace routing is designed to be asymmetric rather than symmetric, with left sub-pixels having different trace connections compared to right sub-pixels, which enables the polarity inversion scheme to work effectively and achieve uniform brightness
Solution Approach 2:
The patent implements periodic action through the polarity inversion cycle, where the polarity of color data is systematically inverted at regular intervals according to a defined pattern. This periodic polarity inversion, combined with the cross-connected traces, ensures that cumulative charging effects are reset periodically, preventing brightness non-uniformity while maintaining a structured and manageable wiring configuration
Data Source
AI summary
A LCD panel includes an invisible zone and a visible zone. The invisible zone includes a gate driver and a wiring zone, wherein the gate driver sequentially outputs six pulse signals. By the wiring zone, a first pulse signal is converted into a first gate driving signal of the visible zone, a second pulse signal is converted into a fourth gate driving signal of the visible zone, a third pulse signal is converted into a fifth gate driving signal of the visible zone, a fourth pulse signal is converted into a second gate driving signal of the visible zone, a fifth pulse signal is converted into a third gate driving signal of the visible zone, and a sixth pulse signal is converted into a sixth gate driving signal of the visible zone.