Display Panel Source Driving Circuit with Selective Buffer Switching
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Solution Overview
Problem
Conventional TFT LCD driving circuits face issues with uneven display due to operational amplifier offsets and power consumption, as well as cross-talk problems from differing scanning pulse driving capacities in gate driving circuits.
Innovation Solution
A circuit and method for driving a display panel that includes a source driving circuit with buffer and switch units to reduce power consumption and eliminate uneven displays, and an adjustable voltage reference circuit to optimize driving capacity, along with a gate driving circuit with adjustable buffers to ensure consistent scanning pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If operational amplifiers are used in the source driving circuit to drive data lines, then the display can be controlled with precise voltage levels, but the operational amplifiers have different offsets causing uneven display and excessive power consumption
Solution Approach 1:
The patent applies periodic action by using a scanning mechanism where the source driving circuit activates different data lines in sequence rather than continuously driving all lines. The switch circuit selectively connects active data lines to the operational amplifier, allowing the amplifier to operate in periodic bursts corresponding to the scanning rate, thereby reducing overall power consumption while maintaining precise voltage control when needed.
Solution Approach 2:
The patent implements local quality by introducing a switch circuit that selectively connects the operational amplifier to specific data lines based on which line is currently being scanned. This ensures that the operational amplifier provides precise voltage control only to the active data line at any given moment, while other data lines are disconnected, thereby reducing power consumption without sacrificing display precision where required.
2Measurement precision
If operational amplifiers are used in the source driving circuit to drive data lines, then the display can be controlled with precise voltage levels, but the operational amplifiers have different offsets causing uneven display
Solution Approach 1:
The patent applies feedback by incorporating a compensation mechanism that detects and corrects for the offset differences between operational amplifiers. The system monitors the actual output voltage levels from each operational amplifier and adjusts their operation to compensate for manufacturing variations, ensuring uniform display across all data lines despite differences in individual amplifier characteristics.
3Ease of operation
If buffers are used in the gate driving circuit to output scanning pulses, then the scanning pulses can be provided to gate lines, but the buffers have different driving capacities causing cross-talk and uneven display
Solution Approach 1:
The patent implements parameter changes by making the buffer driving capacities adjustable rather than fixed. The system modifies the operating parameters of the buffers (such as current drive strength or voltage levels) to compensate for manufacturing variations, ensuring that all buffers provide consistent driving capacity to their respective gate lines, thereby eliminating cross-talk and display uniformity issues.
4Ease of operation
If buffers are used in the gate driving circuit to output scanning pulses, then the scanning pulses can be provided to gate lines, but the buffers have different driving capacities causing excessive power consumption
Solution Approach 1:
The patent applies dynamics by making the buffer driving capacities dynamically adjustable rather than static. The system can adaptively modify the operating parameters of each buffer in real-time to match the actual requirements of the gate lines, ensuring that buffers operate at optimal power levels while providing sufficient driving capacity, thereby reducing overall power consumption without compromising scanning pulse output capability.
Data Source
AI summary
A circuit for driving a display panel comprises a source driving circuit having a plurality of driving units for driving the display panel according to display data; at least one of the driving units has a buffer and a switch circuit wherein the buffer includes an input terminal and an output terminal, and the switch circuit is coupled to the buffer and used for selectively and electrically connecting the output terminal of the buffer and the display panel, electrically connecting the input terminal of the buffer and the display panel, or electrically disconnecting the buffer and the display panel. The present invention also provides a method for driving a display panel.