Flat Panel Display Output Buffer Power Control
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Solution Overview
Problem
In flat panel displays, the driving device wastes energy by maintaining a high power state during both charging/discharging and stable periods, leading to increased power consumption as it requires adequate driving capability only during the transition period.
Innovation Solution
A driving device with a buffer control module that turns off the output buffer during the blanking data period and turns it on during the valid data period, using a buffer control unit and switch units to manage the power state based on system clock or vertical sync signals, reducing power consumption while maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output buffer is kept on during both valid data period and blanking data period, then the driving capability is maintained, but the power consumption increases
Solution Approach 1:
The output buffer is dynamically switched between on and off states based on the data period. During the valid data period, the output buffer is turned on to provide adequate driving capability for charging/discharging pixel capacitors. During the blanking data period, the output buffer is turned off to reduce power consumption, as no pixel data updating is required.
Solution Approach 2:
The output buffer operates in a periodic manner, alternating between active and inactive states synchronized with the data signal transmission periods. The buffer control module controls the output buffer to be on during valid data periods and off during blanking periods, creating a periodic operation pattern that balances performance and power consumption.
2Use of energy by moving object
If the output buffer is turned off during blanking data period, then the power consumption is reduced, but the display quality may be affected
Solution Approach 1:
The output buffer is turned on in advance during the valid data period before the actual data transmission begins. This preliminary action ensures that the buffer is ready to provide adequate driving capability when needed, while being turned off during the blanking period when no data transmission occurs, thus maintaining display quality without unnecessary power consumption.
Solution Approach 2:
The buffer control module uses feedback from the data signal timing information to control the output buffer state. By monitoring the data period boundaries, the control module accurately switches the output buffer between on and off states, ensuring display quality is maintained during valid data periods while saving power during blanking periods.
Data Source
AI summary
A driving device and a driving method of a flat panel display are provided. The driving device includes a driving circuit, an output buffer and a buffer control module. The driving circuit outputs a pixel data during a valid data period, and an input terminal of the output buffer receives the output of the driving circuit. The buffer control module turns off the output buffer during a blanking data period, and turns on the output buffer during the valid data period in order to reduce power consumption of the output buffer, and maintain an image quality of the flat panel display.