Gate Driver Power-Line Segmentation for Uniform Display Luminance
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Solution Overview
Problem
In display devices, fluctuations in the gate power source cause periodic fluctuations in gate signals, leading to luminance differences among pixels, resulting in inconsistent light emission.
Innovation Solution
The display device incorporates multiple gate power lines and a gate driver with stages of transistors and capacitors, including pull-up and pull-down transistors, to stabilize the gate power source and reduce signal fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gate signals are sequentially output through a single gate power line, then the gate driver can be simplified, but periodic fluctuations (ripples) occur in the gate power source causing luminance differences
Solution Approach 1:
The patent divides the gate power supply into multiple independent power lines (first gate power line, second gate power line, third gate power line) that are spatially separated and independently controlled. Each power line supplies power to specific stages of the gate driver, preventing ripple propagation across the entire system. This segmentation resolves the contradiction by maintaining a relatively simple overall structure while eliminating the harmful fluctuations that cause luminance differences.
2Reliability
If multiple gate power lines are used with independent voltage control, then ripple effect is minimized and luminance consistency is improved, but device complexity increases
Solution Approach 1:
The patent implements local quality by providing independent voltage control for each gate power line. The first gate power line, second gate power line, and third gate power line can be independently regulated to maintain stable voltages despite sequential gate signal output. This localized control approach minimizes ripple effects at their respective locations without requiring complex global control mechanisms, thus improving luminance consistency while keeping the added complexity manageable.
3Ease of manufacture
If gate power source is shared across all stages, then manufacturing is simplified, but periodic fluctuations cause inconsistent pixel emission
Solution Approach 1:
The patent segments the gate power supply into multiple independent lines that can be independently controlled during manufacturing and operation. This allows each power line to be optimized for its specific stage while maintaining overall manufacturing feasibility. The segmentation prevents fluctuations from propagating across all stages, ensuring consistent pixel luminance without requiring overly complex manufacturing processes.
Data Source
AI summary
A display device includes gate lines and pixels connected to the gate lines. The display device includes stages which provide gate signals to the gate lines, and first and second gate power lines which transfer a first voltage to the stages. A first stage among the stages includes a first node controller and a first output unit. The first node controller is connected to the second gate power line, and controls a voltage of a first control node. The first output unit is connected to the first gate power line, and outputs a first voltage of the first gate power line as a gate signal in response to a voltage of the first control node.