Gate Driver Circuit Double Pulse Signal Generation Narrow Bezel
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Solution Overview
Problem
Conventional gate driver circuits for OLED displays cannot output a double pulse signal required for sensing transistors, leading to non-uniform display brightness due to performance differences in driving transistors or OLEDs, and are not suitable for narrow bezel designs due to their large size.
Innovation Solution
A driving unit with a shift register and output circuits that generate a double pulse signal by controlling voltages at specific nodes, allowing for the output of active and inactive levels at different times, enabling the driving of sensing transistors and facilitating a narrow bezel design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional gate driver circuit is used, then the circuit structure is simple, but it cannot output a double pulse signal required for sensing transistors
Solution Approach 1:
The gate driver circuit is divided into multiple independent modules: a shift register unit for signal generation, a sensing unit with sensing transistor and capacitor for compensation, and a driving unit with driving transistor and OLED. This segmentation allows each module to perform its specific function independently, enabling the circuit to output double pulse signals while maintaining overall system simplicity.
Solution Approach 2:
The gate driver circuit is designed to perform multiple functions: it generates standard driving signals for OLED activation, outputs double pulse signals for sensing transistor operation, and provides compensation functionality through the sensing unit. This multi-functionality resolves the contradiction by making the circuit adaptable to different signal requirements without significantly increasing complexity.
2Measurement precision
If a gate driver circuit with compensation functionality is added, then sensing and compensation of transistors can be achieved, but the circuit size increases
Solution Approach 1:
The sensing transistor and sensing capacitor are nested within the existing pixel structure, sharing space with the driving transistor and OLED. The sensing unit is integrated into the gate driver circuit layout without requiring separate dedicated area, thus achieving precise transistor sensing while minimizing additional circuit area.
Solution Approach 2:
The circuit design uses planar transistor structures and compact layout techniques that reduce the vertical and lateral footprint of each component. By optimizing the geometric arrangement of the sensing and driving units, the circuit achieves high measurement precision for transistor characteristics while maintaining a compact overall area suitable for display applications.
3Area of stationary object
If the gate driver circuit is designed for narrow bezel displays, then the display area can be maximized, but the circuit must be significantly reduced in size
Solution Approach 1:
The gate driver circuit transitions from a linear one-dimensional arrangement to a two-dimensional planar layout, allowing components to be arranged in a grid pattern rather than a single row. This dimensional change enables significant reduction in the linear footprint of the circuit, maximizing the display area while maintaining all necessary functionality through compact integration.
Data Source
AI summary
The present disclosure provides a driving unit, a driving method thereof, a gate driving circuit, and a display substrate. The driving unit includes: a shift register including a pull-up node, a pull-down node and a driving signal output terminal; and a first output circuit including a first control sub-circuit, a second control sub-circuit, an output sub-circuit, and a first signal output terminal; the first control sub-circuit and the output sub-circuit are coupled at a first node, and the first control sub-circuit, the second control sub-circuit and the output sub-circuit are coupled at a second node.