Per-Line Charge Sharing Control in LCD Data Driving
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Solution Overview
Problem
Current charge sharing control methods in liquid crystal display technologies are limited to overall frame settings and cannot perform independent charge sharing control line by line, leading to inefficiencies in power consumption and circuit current usage.
Innovation Solution
A data driving method and device that utilize a pre-stored charge sharing timing table to transmit charge sharing signals and valid display data through a mini LVDS differential interface, allowing for independent control of charge sharing per line by turning on or off charge sharing switches before polarity inversion, and incorporating a reset signal to manage previous data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If charge sharing control is performed through overall frame settings using configuration information, then the control implementation is simple, but the charge sharing control cannot be performed separately for each data line
Solution Approach 1:
The patent divides the charge sharing control into per-line basis by introducing a charge sharing control signal for each data line. The timing controller generates individual charge sharing control signals (CH0-Ch7) for each data line based on the input image data, allowing independent control of charge sharing for each line rather than uniform frame-level control.
Solution Approach 2:
The patent implements dynamic charge sharing control where the charge sharing control signals are generated in real-time based on the polarity of input image data for each data line. The system dynamically adjusts charge sharing activation for each line according to actual display content requirements, transitioning from static frame-level control to dynamic per-line control.
2Use of energy by moving object
If charge sharing is implemented by shorting odd and even channels before polarity reversal, then power consumption is reduced, but the control method is limited to overall frame settings
Solution Approach 1:
The patent segments the charge sharing control by providing separate charge sharing control signals for each data line. The timing controller processes each data line independently and generates corresponding CH signals, enabling selective activation of charge sharing for specific lines based on their individual polarity reversal needs.
Solution Approach 2:
The patent applies local quality by allowing different charge sharing control characteristics for different data lines. Each data line can have its charge sharing control independently adjusted according to local requirements (input signal characteristics, polarity patterns), rather than applying uniform control across the entire frame.
3Reliability
If a reset signal is transmitted to reset all signals for previous data lines, then signal synchronization is improved, but transmission complexity increases
Solution Approach 1:
The patent merges the reset signal transmission with the existing mini LVDS differential interface used for data transmission. The reset signal is combined with data signals and transmitted through the same physical interface, reducing the need for separate reset signal lines and minimizing additional PCB layout complexity.
Solution Approach 2:
The mini LVDS differential interface is designed to serve multiple functions: transmitting display data, charge sharing control signals, and reset signals. This multi-functional approach reduces overall system complexity by consolidating multiple signal transmission functions into a single interface rather than requiring separate dedicated lines for each function.
Data Source
AI summary
A data driving method and a data driving device are provided. The data driving method includes: transmitting a charge sharing signal for a current data line according to a pre-stored charge sharing timing table; transmitting a valid display data for the current data line; and executing the charge sharing signal to complete a charge sharing between signal channels. The data driving device includes a timing controller, a transmission interface, a source driver, a plurality of data lines, and a charge sharing switch. The data driving method and the data driving device of the disclosure can separately set the charge sharing signal for each row by setting the charge sharing signal on each row of the valid display data through the pre-stored charge sharing timing table. This achieves independent control of charge sharing per line during display.