LCD Data Driver Buffer Power Reduction
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Solution Overview
Problem
The high power consumption of data drivers in liquid crystal display (LCD) devices is a significant issue due to the continuous operation of buffers, even during periods when no image data is being processed, leading to inefficiencies in power usage.
Innovation Solution
A driving circuit and method that selectively turns off buffers in the data driver during frame periods when no image data is being processed, using a low refresh rate signal to control buffer control switches, thereby reducing power consumption by maintaining buffers in an on state only during specific frame periods for image data processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If buffers are continuously driven on in the data driver, then image data processing is maintained, but power consumption increases significantly
Solution Approach 1:
The buffer control switches are dynamically controlled to be turned on during active frame periods and turned off during non-active frame periods. This dynamic switching allows the system to adapt its power consumption state based on whether image data processing is required, resolving the contradiction between continuous processing capability and power consumption reduction.
Solution Approach 2:
The system employs periodic frame periods where buffers are activated only during specific intervals (active frames) and deactivated during other intervals (non-active frames). This periodic action pattern enables the data driver to maintain image processing capability when needed while reducing power consumption during periods when processing is not required.
2Use of energy by moving object
If buffers are turned off during non-processing periods, then power consumption is reduced, but image processing capability is lost
Solution Approach 1:
The buffer control switches dynamically transition between on and off states based on the active/non-active frame period status. This dynamic control ensures that processing capability is restored immediately when an active frame period begins, eliminating the trade-off between power savings and processing capability.
Solution Approach 2:
The system prepares buffer control switches to be in the off state during non-active periods, and immediately activates them when an active frame period begins. This preliminary positioning of switches in the off state during non-processing periods enables rapid transition to processing mode without sacrificing productivity when needed.
Data Source
AI summary
A driving circuit for a display device, for reducing power consumption of a data driver, and a method of driving the driving circuit are disclosed. The driving circuit includes a data driver for maintaining buffers of the data driver in an on state every preset specific frame period and maintaining the buffers in an off state every remaining period except for specific frame periods in a refresh mode for processing image data of one image for the specific frame periods only.