Gate Driving Circuit Discharge Control for LCD Reset Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional gate driving circuits in liquid crystal displays (LCDs) suffer from display defects due to distorted gate signals, which affect the reset function of stages, leading to image display issues.
Innovation Solution
A gate driving circuit with multiple stages connected sequentially, each stage including a voltage output part, an output driving part, a holding part, and a discharge part, featuring a first and second discharge circuit to manage gate voltage and discharge it to an off-voltage in response to clock signals and control signals, reducing display defects by ensuring proper voltage management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each stage is reset in response to a gate signal of an immediately subsequent stage, then the reset function is achieved, but display defects occur when the gate signal is distorted
Solution Approach 1:
A discharge control signal is introduced as an intermediary control mechanism to manage the discharge part independently. This discharge control signal is generated based on clock signals and is independent of the gate signal, allowing the discharge function to operate reliably even when the gate signal is distorted. The discharge part uses this intermediary signal to ensure proper voltage discharge to the off-voltage level, preventing display defects while maintaining the reset function.
Solution Approach 2:
The gate driving circuit is segmented into distinct functional parts: a voltage output part, an output driving part, a holding part, and a discharge part. This segmentation allows each part to be controlled independently. The discharge part is specifically designed to respond to the discharge control signal rather than relying solely on the gate signal, enabling it to function correctly even when other parts of the circuit experience signal distortion.
2Device complexity
If the gate driving circuit uses conventional reset mechanism, then circuit simplicity is maintained, but display defects occur due to signal distortion
Solution Approach 1:
The discharge part is activated in advance based on clock signals to prepare for potential signal distortion issues. By using the clock signal to generate the discharge control signal, the circuit proactively manages voltage discharge before distortion can affect the reset function. This preliminary action ensures that even if the gate signal becomes distorted, the discharge function has already been triggered to maintain proper voltage levels.
3Use of energy by moving object
If discharge is performed only during active clock signal periods, then power consumption is reduced, but display defects occur during clock signal downtime
Solution Approach 1:
The discharge control signal is generated using feedback from the clock signals. The circuit monitors the clock signal state and automatically generates appropriate discharge control signals to maintain proper voltage levels during both active and inactive periods. This feedback mechanism ensures that discharge occurs at the appropriate times to prevent display defects while minimizing unnecessary discharge operations that would waste power.
Data Source
AI summary
A gate driving circuit includes a plurality of stages which are connected to each other one after another and each stage of the plurality of stages outputs a gate voltage to a corresponding gate line of a plurality of gate lines in response to at least one clock signal. Each stage of the plurality of stages includes; a voltage output part which outputs the gate voltage, an output driving part which drives the voltage output part, a holding part which holds the gate line at an off-voltage, and a discharge part arranged at a first end of the gate line to discharge the gate line to the off-voltage in response to the gate voltage output from the voltage output part,