TFT LCD Overdrive Driving Controller for Small Panels
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Solution Overview
Problem
Existing dot inversion and overdrive driving methods for liquid crystal display (LCD) panels are not suitable for medium or small-sized TFT LCD panels with small-sized circuit structures and low power consumption requirements, as they are designed for large-sized panels with high power capacity.
Innovation Solution
A liquid crystal display system that incorporates a driving controller with a frame memory, line memory, and overdrive voltage setup unit to alternately drive odd and even gate lines, applying overdrive voltage based on image signal differences to improve response time and reduce power consumption, while inverting polarity of image signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dot inversion driving method is used for large-sized TFT LCD panel, then display quality is improved, but it is not suitable for medium or small-sized panels with low power consumption requirements
Solution Approach 1:
The patent implements dynamic adaptation by allowing the driving controller to selectively apply overdrive voltage based on the specific requirements of different panel sizes. The system dynamically adjusts the driving method between standard dot inversion and overdrive mode depending on the panel type, making the same hardware architecture adaptable to both large and medium/small panels without requiring separate designs.
2Speed
If overdrive driving method is used to shorten liquid crystal response time, then response time is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by selectively applying overdrive voltage only to specific pixels or regions where it is most needed, rather than uniformly across the entire display. The overdrive voltage is applied based on the image signal characteristics and panel requirements, allowing response time improvement in critical areas while minimizing overall power consumption increase.
3Reliability
If dot inversion driving method is used with polarity inversion every frame and data line, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent merges the dot inversion driving method with the overdrive driving method into a unified system controlled by a single driving controller. Instead of requiring separate complex control circuits for each method, the design integrates both functionalities, allowing the controller to switch between or combine these methods based on panel requirements, thereby reducing overall device complexity.
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
Enhances display quality and reduces power consumption and manufacturing costs for medium or small-sized TFT LCD panels by optimizing the driving method to suit their specific requirements.
Implementation Method 1
a liquid crystal display includes a plurality of gate lines having odd-numbered gate lines and even-numbered gate lines, a plurality of source lines
Data Source
AI summary
A liquid crystal display includes a plurality of gate lines having odd-numbered gate lines and even-numbered gate lines, a plurality of source lines, a first gate driver which drives the odd-numbered gate lines, a second gate driver which drives the even-numbered gate lines and a driving controller which outputs an overdriven image signal in at least one driving period of a plurality of driving periods and outputs a normal image signal in remaining driving periods of the plurality of driving periods. The overdriven image signal is obtained by adding an overdrive voltage to the normal image signal, and the overdrive voltage is set according to a level of the normal image signal.