Liquid Crystal Driving System Voltage Segmentation
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Solution Overview
Problem
Existing liquid crystal devices face challenges in achieving low power consumption due to the high voltage amplitude required for data lines, despite efforts to reduce power consumption in previous technologies.
Innovation Solution
A driving system that alternates voltages between storage capacitor elements connected to pixel electrodes, using a supply circuit to apply different voltages to adjacent horizontal lines and a switching circuit to invert voltages periodically, while a control circuit connects and disconnects these elements to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high voltage amplitude is applied to data lines to drive liquid crystal, then the liquid crystal can be properly driven, but power consumption increases
Solution Approach 1:
The patent divides the pixel array into multiple groups based on row numbers, with each group having different voltage levels applied to storage capacitor elements. This segmentation allows different regions to operate at different voltage amplitudes, reducing overall power consumption while maintaining proper liquid crystal driving conditions in each segment.
Solution Approach 2:
The patent applies different voltage levels to storage capacitor elements based on the row numbers of pixels they control. Specifically, pixels in certain row ranges receive different voltage amplitudes than pixels in other row ranges. This local differentiation optimizes power consumption for each region while ensuring proper liquid crystal operation.
2Reliability
If voltage is applied to storage capacitor elements to hold image signals, then signal retention is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the voltage levels applied to storage capacitor elements based on the operational state and row number of associated pixels. The voltage is not fixed but varies according to the specific pixel group being operated, allowing the system to maintain signal retention while minimizing unnecessary power consumption in inactive regions.
Solution Approach 2:
The patent changes the voltage parameter of storage capacitor elements based on row number ranges. Different voltage levels are applied to different row groups, optimizing the balance between signal retention capability and power consumption for each region of the display.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for a reduction in power consumption by applying effective voltages higher than the image signal amplitudes to the electro-optic material, reducing the power needed to invert potentials and minimizing the difference in voltage applied to storage capacitor elements.
Implementation Method 1
a plurality of storage capacitor elements whose first ends are each electrically connected to a corresponding pixel electrode
Implementation Method 2
an electro-optic material driven in accordance with an electric field applied between the plurality of pixel electrodes and the counter electrode
Data Source
AI summary
A driving system that drives an electro-optic device including a plurality of pixel electrodes, a counter electrode, a plurality of storage capacitor elements, and an electro-optic material is provided. The driving system includes a supply circuit that selectively supplies voltage to first and second ends of capacitor elements corresponding to a first horizontal line. A switching circuit is also provided that switches, in sequence every predetermined period, each of the voltages to be supplied to the second end of the capacitor elements from a first voltage to a second voltage or from the second voltage to the first voltage. A control circuit electrically connects the second end of the first storage capacitor elements and to each other before the voltage switched by the switching circuit is supplied to the second end of at least one of the storage capacitor elements.