Gate Driving Circuit With Reset-Based Shift-Register Leakage Control
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Solution Overview
Problem
The gate driving circuit in display panels experiences leakage issues due to inefficiencies in the shift register design, leading to suboptimal performance.
Innovation Solution
The gate driving circuit incorporates a turn-off unit and a first reset unit to control voltages within the shift register, utilizing transistors and capacitors to ensure thorough turning off of transistors, thereby reducing leakage by applying complementary voltages and enhancing voltage transmission capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional shift register design is used, then device complexity is reduced, but leakage occurs in the gate driving circuit
Solution Approach 1:
The shift register is divided into multiple independent stages, each with its own reset unit and turn-off unit. This segmentation allows each stage to be independently controlled and reset, preventing leakage propagation across the entire circuit while maintaining modular complexity
Solution Approach 2:
A reset unit is introduced that operates before the normal operation cycle to preemptively clear any residual charges or leakage states in the node. This preliminary action ensures the circuit starts each cycle in a clean state, preventing leakage accumulation without requiring complex continuous control mechanisms
2Reliability
If turn-off voltage is applied to control transistors, then leakage is reduced, but voltage transmission capability may be affected
Solution Approach 1:
The circuit employs periodic switching between turn-on and turn-off states with distinct voltage levels. During the turn-off phase, a specific turn-off voltage is applied to minimize leakage, while during the active phase, the voltage is adjusted to ensure adequate transmission capability. This periodic alternation allows optimization for each state separately
Solution Approach 2:
Different voltage parameters are used for different functions: a turn-off voltage parameter is specifically optimized for minimizing leakage when transistors are off, while a separate drive voltage parameter ensures adequate power transmission when transistors are on. This parameter separation allows independent optimization of both contradictory requirements
Data Source
AI summary
Provided are a gate driving circuit, a display panel, and a display device. The gate driving circuit includes multiple cascaded shift registers. A shift register includes a first input unit, a second input unit, a first output unit, a second output unit, a first reset unit and a turn-off unit. The first reset unit is configured to write a turn-off voltage into a first node; the gate of the first reset transistor is connected to a first clock signal terminal or a third clock signal terminal; a first electrode of the first reset transistor is connected to a first node; and a first terminal of the turn-off unit is connected to a second electrode of the first reset transistor and is configured to write a turn-on voltage into the second electrode of the first reset transistor when the first node controls the turn-off unit to turn on.