Liquid Crystal Display Power Reduction via Inverted Common Signals
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Solution Overview
Problem
Liquid crystal displays face increased power consumption due to polarity inversion of data voltage for each frame, row, or column, leading to higher power usage by the power generator and data driver.
Innovation Solution
The liquid crystal display employs a method where adjacent pixels in a row or column receive common signals with inverted polarities, with data voltages having constant polarity during a frame, and common signals swinging between different voltages, reducing the overall power voltage and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity inversion driving is applied to prevent deterioration and spots, then display quality is improved, but power consumption increases due to doubled voltage changes
Solution Approach 1:
The display panel is divided into multiple blocks, with each block containing multiple pixel rows. Common signals are applied differently to each block, allowing selective polarity management. This segmentation enables the system to maintain display quality through targeted polarity inversion while reducing overall power consumption by not inverting polarity across the entire display simultaneously.
Solution Approach 2:
Different common signal polarity patterns are applied to different blocks of the display. Specifically, first common signals and second common signals with inverted polarities are selectively applied to adjacent pixel rows within blocks. This local differentiation allows the patent to maintain necessary polarity inversion for display quality while controlling the spatial distribution of voltage changes to reduce power consumption.
2Use of energy by moving object
If common signals with inverted polarities are applied to adjacent pixels, then power consumption is reduced by minimizing voltage range, but device complexity increases due to multiple signal lines
Solution Approach 1:
Multiple common signal lines (first common signal lines and second common signal lines) are integrated into a unified block-based architecture. The patent combines these signal lines with data lines and pixel electrode connections to form an organized system where signal distribution is managed through block-level control. This merging approach, while adding initial complexity, enables efficient power management through coordinated signal application.
Solution Approach 2:
The common signals are designed to dynamically change polarity based on the block and pixel row being addressed. First common signals and second common signals are selectively applied to different blocks and pixel rows, creating a dynamic signal distribution system. This dynamic approach allows the patent to optimize power consumption by applying voltage changes only where necessary, rather than using static high-voltage configurations across the entire 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 reduces power consumption by minimizing the voltage range required for gray voltage generation, thereby decreasing the power used by the gray voltage generator and data driver.
Implementation Method 1
applying the data voltage and the common electrode to the pixel electrode and the opposing electrode to generate an electric field in the liquid crystal layer
Implementation Method 2
a liquid crystal layer interposed therebetween
Data Source
AI summary
The described technology relates to a liquid crystal display and a driving method thereof. The liquid crystal display includes a plurality of pixels arranged in a matrix form. The pixels include a liquid crystal capacitor including a pixel electrode and a common electrode as two terminals. A plurality of data lines transfer data to the plurality of pixels. The pixels include a first pixel and a second pixel, which are adjacent to each other. First and second common signals are applied to the common electrode of the first and second pixels, respectively. The second common signal is inverted to the first common signal. The first and second common signals swing between a first voltage and a second voltage. The polarity of the data voltage transferred by a data line with respect to the first common signal or the second common signal is constant during one frame.