Dynamic Driving Voltage Control for LCD Power Efficiency
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Solution Overview
Problem
Existing LCD devices consume excessive power due to a constant driving voltage applied to the source driving IC, leading to inefficient power usage, especially when displaying normal patterns with low output current, as the frequency of the transistor switching signal is fixed regardless of the image pattern, resulting in wasted power and reduced efficiency of the driving voltage generator.
Innovation Solution
The LCD device and driving method dynamically adjust the level of the driving voltage applied to the source driving IC based on the image pattern, using a timing controller to generate power control signals that determine whether to use a first or second driving voltage with different levels, optimizing the efficiency of the driving voltage generator by varying the frequency and voltage levels according to the specific or normal patterns displayed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant driving voltage is applied to the source driving IC, then the device can operate reliably under all conditions, but power consumption increases due to unnecessary power waste when displaying normal patterns
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant driving voltage to a dynamic variable driving voltage system. The driving voltage is adjusted in real-time based on the image pattern being displayed, using a voltage selector that switches between different voltage levels (first driving voltage for specific patterns, second driving voltage for normal patterns) to optimize power consumption while maintaining operational reliability.
Solution Approach 2:
The patent changes the voltage parameter dynamically based on display conditions. By detecting the image pattern and selecting appropriate driving voltage levels from multiple available voltages, the system optimizes the voltage parameter to reduce power consumption during normal operations while ensuring sufficient voltage for specific patterns that require higher performance.
2Device complexity
If the frequency of the transistor switching signal is fixed, then the driving voltage generator operates simply, but efficiency decreases when displaying normal patterns with low output current
Solution Approach 1:
The patent makes the switching signal frequency dynamic by adjusting it according to the display pattern. The controller modifies the frequency of the transistor switching signal based on whether a specific pattern or normal pattern is being displayed, allowing the driving voltage generator to operate at optimal efficiency for each condition rather than maintaining a fixed frequency.
Solution Approach 2:
The patent implements periodic action by using different switching frequencies for different display patterns. The switching signal frequency is periodically adjusted based on the pattern type, creating an optimized operating cycle that matches the display requirements and reduces energy loss during normal pattern display.
3Reliability
If a high level driving voltage is continuously applied to the DAC block, then the gamma reference voltage can be generated adequately, but power is wasted when only low level gamma reference voltage is needed
Solution Approach 1:
The patent changes the driving voltage parameter applied to the DAC block based on the required gamma reference voltage level. By selecting from multiple available driving voltages according to the display pattern, the system applies only the necessary voltage level to the DAC block, avoiding the continuous application of high voltage and thereby reducing power waste while ensuring adequate gamma reference voltage generation.
Data Source
AI summary
Disclosed are an LCD device and a driving method thereof. The LCD device includes at least one source driving ICs configured to drive a plurality of data lines formed in a panel, a timing controller configured to generate a power control signal used to change a level of a driving voltage applied to the source driving ICs according to a pattern of an image output to the panel, and a driving voltage generator configured to generate a first driving voltage or a second driving voltage according to the power control signal to drive the source driving ICs. The first and second driving voltages have different levels.