Gamma Voltage Control in Display Drivers for Lower Porch Power
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Solution Overview
Problem
The power consumption of the gamma voltage generator in display devices is substantial and needs to be reduced to drive the display panel at a relatively low power.
Innovation Solution
A display driving circuit and method that includes a gamma voltage generator with a gamma control logic circuit to generate and control gamma voltages, a data driver to generate data signals, and a processor to manage modes, reducing power consumption by inactivating unnecessary gamma amplifiers during porch sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gamma voltage generator operates continuously to provide gamma voltages for all display periods, then display functionality is maintained, but power consumption increases
Solution Approach 1:
The gamma voltage generator is controlled to operate periodically rather than continuously. During porch sections (inactive periods between display periods), the gamma voltage generator is inactivated. The control circuit determines when to activate or inactivate the gamma voltage generator based on whether the current time corresponds to a display period or porch section, thereby reducing power consumption while maintaining display functionality during active periods
Solution Approach 2:
The operating state of the gamma voltage generator is dynamically changed based on timing conditions. The control circuit actively switches the gamma voltage generator between active and inactive states according to the timing signal that indicates whether the current moment is a display period or porch section, optimizing power usage while ensuring functionality is available when needed
2Use of energy by moving object
If gamma voltage generator is inactivated during porch sections to reduce power consumption, then power efficiency improves, but response time may increase
Solution Approach 1:
The control circuit is configured to activate the gamma voltage generator in advance before display periods begin. By monitoring the timing signal that indicates transitions from porch sections to display periods, the control circuit ensures the gamma voltage generator is activated timely so that gamma voltages are ready when needed, minimizing any potential delay while still allowing power savings during porch sections
Data Source
AI summary
Provided is a display driving circuit, including at least one processor configured to generate a first gamma code corresponding to a first mode among a plurality of modes, a gamma voltage generator configured to generate a plurality of gamma voltages with respect to the first mode, a data driver configured to generate data signal corresponding to the first gamma code based on the first gamma code and the plurality of gamma voltages, and generate a first level data corresponding to a minimum gamma voltage among the plurality of gamma voltages based on the data signal, and a gamma control logic circuit configured to generate a gamma voltage control signal for controlling the gamma voltage generator based on the first level data.