Waveform Adjusting Circuit for Display Driver Pulse Signal Integrity
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Solution Overview
Problem
As display panels become larger and higher in resolution, one-side drive configurations face challenges with gate waveform changes and complex control issues, particularly during pause driving, which can lead to decreased display quality.
Innovation Solution
A display device with a driver circuit and waveform adjusting circuit formed on a single substrate, where the waveform adjusting circuit steeps the trailing end of the pulse signal and uses clock signals to maintain waveform consistency, including transistors and nodes connected to power supplies and scanning signal lines to ensure stable pulse signals even during pause periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If one-side drive configuration is used to reduce picture-frame area, then the area of left and right sides of picture-frame is reduced, but gate waveform changes between output from gate driver and after passing through panel load
Solution Approach 1:
The patent applies local quality by introducing a waveform adjusting circuit at the specific location of the gate driver output to correct waveform distortion. This circuit selectively adjusts the trailing end of the pulse signal based on the actual waveform degradation observed in the one-side drive configuration, thereby maintaining waveform stability without requiring two-side drive architecture.
2Use of energy by moving object
If pause driving is performed to reduce power consumption, then power consumption is reduced, but display quality decreases due to inability to receive output operation signal from subsequent stage
Solution Approach 1:
The patent applies preliminary action by proactively adjusting the waveform of the pulse signal before it is transmitted through the scanning signal line during pause driving periods. The waveform adjusting circuit pre-compensates for potential waveform degradation by steepening the trailing end of the pulse, ensuring that display quality is maintained even when the subsequent stage cannot provide feedback signals.
3Reliability
If drive signal is changed to improve display quality during pause driving, then display quality is improved, but control becomes complicated and typical display driver cannot be used
Solution Approach 1:
The patent applies parameter changes by modifying specific parameters of the drive signal (waveform shape, particularly the trailing end steepness) rather than changing the entire driving scheme. The waveform adjusting circuit achieves this by controlling the discharge timing of a capacitor based on the pulse signal timing, which is a localized parameter adjustment that maintains compatibility with typical display drivers while improving display quality during pause driving.
Data Source
AI summary
To prevent a decrease in display quality caused when a display apparatus performs pause driving. One end of the n-th scanning signal line (GLn) is connected to the n-th stage circuit (UCn) of a driver circuit. The other end of the n-th scanning signal line is connected to a waveform adjusting circuit (HKn) which adjusts the waveform of the pulse signal of the n-th scanning signal line (GLn) by using a clock signal (CKA) and the pulse signal of the m-th scanning signal line (GLn−1) scanned prior to the n-th scanning signal line.