Dual-Supply Gate Driver Circuit for Stable Display Panel Signals
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Solution Overview
Problem
Existing driving circuits for liquid crystal displays face interference issues due to a single power supply being used for generating multiple gate signals, where the voltage level of one gate signal is affected by others, failing to meet the high standards required for high-resolution and large-size displays.
Innovation Solution
A driving circuit utilizing two power supply circuits with different capabilities: a first power supply circuit with higher capability for rising voltage levels and a second with lower capability for maintaining voltage levels, ensuring non-interfering control of gate signals through separate power inputs and drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single power supply is used for the gate driving circuit to generate multiple gate signals, then the device complexity is reduced, but the voltage level of gate signals is affected by mutual interference
Solution Approach 1:
The power supply circuit is segmented into a first power supply circuit and a second power supply circuit. The first power supply circuit provides power during a voltage rising period, while the second power supply circuit provides power during a voltage holding period. This segmentation eliminates mutual interference between gate signals by isolating their power sources, thereby maintaining voltage stability without significantly increasing overall system complexity.
2Reliability
If multiple power supply circuits are used for different gate signals, then the voltage level stability is improved, but the device complexity increases
Solution Approach 1:
The power supply configuration is made dynamic by switching between the first power supply circuit and the second power supply circuit based on the operational phase. During the voltage rising period, the first power supply circuit is activated; during the voltage holding period, the second power supply circuit is activated. This dynamic switching approach optimizes voltage stability while controlling complexity through time-multiplexed power supply management.
3Manufacturing precision
If the voltage level of gate signals is increased to meet high resolution display standards, then the display quality is improved, but the power consumption increases
Solution Approach 1:
The power supply operates in periodic phases: a voltage rising period using the first power supply circuit, and a voltage holding period using the second power supply circuit. This periodic action allows the system to achieve high voltage levels necessary for high-resolution displays while reducing overall power consumption by maintaining voltage rather than continuously supplying high power.
Data Source
AI summary
A driving circuit for display panel is provided. Wherein, a first and a second power supply circuits produce a first and a second supply voltages. The electric charge provided by the second power supply circuit is less than that provided by the first power supply circuit. A plurality of drivers include a plurality of first power input terminals and a plurality of second power input terminals. The first power input terminals are coupled to the first power supply circuit and receives the first supply voltage. The second power input terminals are coupled to the second power supply circuit and receives the second supply voltage. The drivers increase the voltage levels of a plurality of gate signals in a voltage rising period according to the first supply voltage. The drivers hold the voltage levels of gate signals in a voltage holding period according to the second supply voltage.