Source Driver Buffer Amplifier Power Gating for LCD Panels
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Solution Overview
Problem
High power consumption in liquid crystal display panels, particularly due to static current in source driver chips during blanking intervals, leads to increased temperature and reduced operation stability, which does not align with energy conservation requirements.
Innovation Solution
A driving circuit for source driving chips incorporating a blanking timer, switching unit, buffer amplifier, and voltage level conversion circuit, where the switching unit controls power supply to the buffer amplifier based on voltage levels generated during blanking and non-blanking intervals, preventing static current during blanking intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the buffer amplifier in the source driving chip continuously operates during row blanking interval and frame blanking interval, then the data signal output capability is maintained, but unnecessary power consumption occurs due to static current
Solution Approach 1:
The patent applies dynamics by making the buffer amplifier's operating state changeable between on-state and off-state based on timing signals. The source driving chip transitions the buffer amplifier from continuous operation to selective operation based on whether the current period is a blanking interval or active interval, optimizing power consumption while maintaining data output capability when needed.
Solution Approach 2:
The patent implements periodic action by using the row blanking interval signal and frame blanking interval signal to periodically control the buffer amplifier's operation. The amplifier operates during active intervals and shuts down during blanking intervals, creating a periodic on-off pattern that eliminates static current during non-active periods while maintaining readiness for data output.
2Speed
If the source driving chip operates continuously to maintain data signal output readiness, then immediate data transmission is possible, but temperature increases and operation stability is affected
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the buffer amplifier's operational state based on timing signals. The amplifier is activated only during row non-blanking intervals and frame non-blanking intervals, allowing the system to maintain data transmission readiness when needed while reducing continuous operation that generates heat, thus lowering panel temperature.
3Reliability
If the buffer amplifier operates during blanking intervals, then continuous operation stability is maintained, but energy conservation requirements are not met
Solution Approach 1:
The patent implements periodic action by using timing signals to periodically activate and deactivate the buffer amplifier. The amplifier operates during row non-blanking intervals and frame non-blanking intervals when data transmission is needed, and shuts down during blanking intervals to conserve energy, achieving both operational stability and energy conservation.
Solution Approach 2:
The patent extracts the unnecessary static current consumption by selectively removing power supply to the buffer amplifier during blanking intervals. By taking out the power supply connection during periods when data output is not required, the circuit eliminates wasted energy while maintaining the amplifier's functionality when needed.
Data Source
AI summary
The present disclosure discloses a driving circuit for a source driving chip. In the driving circuit for a source driving chip, an output terminal of the blanking timer is connected to a control terminal of the switching unit; an input terminal of the switching unit is connected to a power supply source; an output terminal of the switching unit is connected to a supply terminal of the buffer amplifier. The blanking timer is used to generate a control signal; wherein, the control signal is a first voltage level during a row blanking interval or a frame blanking interval; the control signal is a second voltage level during the row non-blanking interval or the frame non-blanking interval. The driving circuit for a source driving chip of the present disclosure can effectively reduce the power consumption.