Display Panel Driver Circuit Startup Flash Prevention
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Solution Overview
Problem
Existing liquid crystal display (LCD) panels, particularly TFT-LCDs, experience flickering issues during startup due to voltage differences between the source and gate electrodes, affecting display quality and user experience.
Innovation Solution
A driving method and driver circuit that manage the source electrode driver circuit and common voltage line to maintain consistent voltages during startup, using a series of switches and a detection circuit to ensure the voltage difference between the liquid crystals is minimized, thereby preventing flashes and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the source electrode driver circuit is started and outputs voltage while the gate electrode driver is turned on, then the display panel can be initialized, but a voltage difference between the source and gate electrodes causes flash problems
Solution Approach 1:
The patent applies preliminary action by pre-charging the common voltage line to the same voltage level as the source electrode driver circuit before normal operation begins. The detection circuit monitors the source electrode driver output and activates the common voltage line in advance, ensuring both lines are at the same voltage level before picture data is input, thereby preventing flash problems during startup
Solution Approach 2:
The patent implements feedback through the detection circuit that continuously monitors the output voltage of the source electrode driver circuit and uses this information to control the switching of the common voltage line. This feedback mechanism ensures the common voltage line voltage matches the source electrode driver voltage at all times, eliminating voltage differences that cause flashes
2Object-affected harmful factors
If the common voltage line is disconnected or outputs 0V during source electrode driver reset, then flash problems are avoided, but the display panel cannot be properly initialized
Solution Approach 1:
The patent applies dynamics by making the common voltage line state changeable through controlled switching. The common voltage line can dynamically transition between different states (disconnected, 0V, or charged to matching voltage) based on the operational phase, allowing both safe reset conditions and proper initialization to be achieved at different times
Data Source
AI summary
The application discloses a driving method and a driver circuit for a display panel, where the driving method includes the following steps: starting a source electrode driver circuit, outputting OV voltage, and simultaneously enabling a common line to output 0 V voltage or be disconnected; outputting, a preset initial voltage by the source electrode driver circuit, and simultaneously enabling the common line to output the identical initial voltage; after starting the source electrode driver circuit, transmitting a gray-scale voltage to the display panel; meanwhile, controlling a gamma circuit of the display panel to output a preset common voltage to the common line through a common voltage line.