LCD Gate Driving Circuit With Series Pull-Down Voltage Sharing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reliability and lifetime of gate driving circuits in liquid crystal display (LCD) apparatuses are compromised due to high voltage application, leading to increased power consumption and manufacturing costs, primarily because of the use of multiple switching elements in the gate driving circuit.
Innovation Solution
The gate driving circuit incorporates a pull-up control part, a pull-up part, a carry part, a first pull-down part, and a second pull-down part, with transistors connected in series in the first pull-down part to distribute voltage and improve reliability, and an inverting part connected to subsequent stages to reduce power consumption and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple switching elements are used in the gate driving circuit, then the circuit can perform its function, but the reliability deteriorates and lifetime shortens due to high voltage application
Solution Approach 1:
The patent combines multiple switching elements into a single switching element structure. The gate driving circuit uses one switching element that controls multiple nodes simultaneously, eliminating the need for separate switching elements for each node. This merging approach maintains the required switching functionality while reducing the total number of switching elements, thereby improving reliability and extending lifetime by reducing high voltage stress points.
Solution Approach 2:
The single switching element in the gate driving circuit is designed to perform multiple functions simultaneously. It controls both the gate output signal and the carry signal, and can switch between different voltage levels and signal paths. This multi-functional design allows one switching element to replace what would traditionally require multiple separate switching elements, reducing device complexity while maintaining full circuit functionality.
2Reliability
If multiple switching elements are used in the gate driving circuit, then the circuit can perform its function, but power consumption increases
Solution Approach 1:
By merging multiple switching elements into a single switching element, the patent reduces the total power consumption of the gate driving circuit. Fewer switching elements mean fewer sources of power loss from switching operations, leakage currents, and resistive heating. The single switching element is designed to handle the total switching load, reducing overall energy consumption while maintaining circuit reliability.
3Reliability
If multiple switching elements are used in the gate driving circuit, then the circuit can perform its function, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple switching elements into a single switching element structure, which directly reduces manufacturing cost. Fewer switching elements mean fewer fabrication steps, fewer material deposits, and simpler processing requirements. The single switching element can be manufactured as a single integrated structure, reducing both material costs and manufacturing complexity, thereby making the gate driving circuit more cost-effective while maintaining reliability.
Data Source
AI summary
A gate driving circuit includes a pull-up control part, a pull-up part, a carry part, a first pull-down part and a second pull-down part. The pull-up control part applies a carry signal from a previous stage to a first node. The pull-up part outputs an N-th gate output signal based on a clock signal. The carry part outputs an N-th carry signal based on the clock signal in response to the signal applied to the first node. The first pull-down part includes a plurality of transistors connected to each other in series. The first pull-down part pulls down a signal at the first node to a second off voltage in response to a carry signal of a next stage. The second pull-down part pulls down the N-th gate output signal to a first off voltage in response to the carry signal of the next stage.