Display Device Gate Driver Zero-Cross Synchronization
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Solution Overview
Problem
Display devices experience excessive inrush current when driven by high AC power, leading to voltage drops in the load, which affects image quality.
Innovation Solution
A system that generates a zero-cross signal to synchronize the driving of gate lines with the zero-cross points of the AC power, preventing excessive peak current and voltage drops by controlling the gate driver to match the zero-cross signal, thereby optimizing the power supply characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate driver sequentially drives each gate line according to control signal, then the display panel can be properly driven, but excessive inrush current is generated when AC power voltage is high, causing voltage drop in the load
Solution Approach 1:
The timing controller detects the zero-crossing point of AC power voltage in advance and delays the gate line driving timing until the voltage reaches a safe level. This preliminary detection and timing adjustment prevents excessive inrush current from occurring when AC power voltage is high, while still ensuring proper display operation.
Solution Approach 2:
The gate line driving timing is dynamically adjusted according to the real-time AC power voltage level. When AC voltage is high, the driving timing is delayed until voltage drops to a safe level. When AC voltage is low, driving can proceed normally. This dynamic adaptation resolves the contradiction between reliable display operation and preventing harmful inrush current.
2Productivity
If the gate line is driven at any timing, then the display can operate, but high AC power voltage causes excessive peak current and voltage drop
Solution Approach 1:
The system performs preliminary detection of AC power voltage characteristics and uses this information to determine the optimal timing for gate line driving. By detecting zero-crossing points in advance, the system can schedule driving operations when voltage conditions are safe, preventing peak current issues while maintaining display productivity.
Solution Approach 2:
The driving timing parameter of the gate lines is changed based on the AC power voltage level. Instead of fixed timing, the system adjusts the timing parameter dynamically - delaying driving when voltage is high and allowing normal operation when voltage is low. This parameter adjustment resolves the contradiction between continuous display operation and peak current prevention.
Data Source
AI summary
An electronic appliance includes a display device and a power supply device providing a driving voltage to the display device. The display device avoids high inrush current to provide high quality display. The display device is connected to a power supply device providing a driving power to the display device. The display device comprises a display panel having a plurality of data lines and gate lines crossing each other, a plurality of pixels arranged in matrix form defined by the data and gate lines, a data driver, a gate driver, a timing controller adapted to control the data and gate drivers. The timing controller is adapted to control the driving of each gate line of the gate driver to correspond to a zero-cross point of the driving power supplied from the power supply device for driving the display panel.