Liquid Crystal Display Driving Circuit Reducing Data IC Count
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display devices face challenges in reducing the number of data driving integrated circuits (ICs) while maintaining picture quality and reducing power consumption, often resulting in defects like spots on horizontal or vertical lines due to halved data charge.
Innovation Solution
The apparatus and method involve arranging sub-pixels of the same colors in alternating directions of gate and data lines, with odd and even sub-pixels connected to shared data lines, and using a timing controller to generate different gate and data control signals for odd and even frame periods, enabling reduced power consumption through inversion driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of data lines is reduced by half by locating odd and even sub-pixels at both sides of one data line, then the number of data ICs is halved, but the amount of data charge is also halved causing picture defects
Solution Approach 1:
The liquid crystal panel is divided into multiple groups of sub-pixels (first group, second group, third group, fourth group) based on their color and position. Each group is assigned to a specific data line, enabling selective charging. This segmentation allows the patent to reduce the number of data lines while maintaining sufficient data charge by ensuring that multiple sub-pixels in each group receive charge from their respective data lines.
Solution Approach 2:
Different regions of the liquid crystal panel are assigned different data line connections based on their local characteristics. Sub-pixels in the first and second groups (red and green) are connected to different data lines than sub-pixels in the third and fourth groups (blue), creating a localized charging structure that maintains data charge distribution even when the overall number of data lines is reduced.
2Reliability
If more data ICs are used to maintain resolution and picture quality, then manufacturing costs increase
Solution Approach 1:
Multiple sub-pixels of different colors are merged into groups that share common data lines. The first group (red sub-pixels) and second group (green sub-pixels) are merged with the third group (blue sub-pixels) and fourth group (blue sub-pixels) in a way that allows them to share data line resources. This merging reduces the total number of data ICs required while maintaining the ability to display all color information.
Solution Approach 2:
Each data line is designed to serve multiple functions by connecting to multiple sub-pixel groups. The data lines are configured to selectively charge different groups of sub-pixels based on the driving sequence, allowing a reduced number of data ICs to perform the charging function for all sub-pixels in the panel.
3Device complexity
If data charge is halved through time division driving, then the number of data ICs is reduced, but picture defects such as spots on horizontal lines or vertical lines are generated
Solution Approach 1:
The patent applies preliminary action by pre-charging sub-pixels before the main display period. The driving sequence includes a first period where certain sub-pixel groups are charged, followed by a second period where other groups are charged. This preliminary charging arrangement ensures that data charge is distributed adequately across all sub-pixels before the display begins, preventing picture defects.
Solution Approach 2:
The driving sequence is divided into periodic action phases: a first driving period for charging first and second sub-pixel groups, and a second driving period for charging third and fourth sub-pixel groups. This periodic charging action ensures that all sub-pixel groups receive adequate data charge over time, preventing the picture defects that would result from halved data charge while maintaining a reduced number of data ICs.
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 the number of data driving ICs by up to one-third, improves picture quality, and decreases power consumption by inverting data polarity per frame unit, effectively addressing the defects in conventional structures.
Implementation Method 1
The liquid crystal display device displays images using electro-optical characteristics of a liquid crystal. The liquid crystal shows anisotropic properties having different refractive indexes and different dielectric constants according to long-axis and short-axis directions of molecules and molecule arrangement and optical properties thereof can be easily controlled.
Implementation Method 2
The liquid crystal shows anisotropic properties having different refractive indexes and different dielectric constants according to long-axis and short-axis directions of molecules and molecule arrangement
Data Source
AI summary
Disclosed herein are an apparatus and method for driving a liquid crystal display device. The apparatus includes a liquid crystal panel in which the same colors of three-color sub-pixels are arranged in the directions of a plurality of gate lines, a data driver for driving a plurality of data lines, a first gate driver for sequentially driving (4n−3)th and (4n)th gate lines among the gate lines during odd frame periods, a second gate driver for sequentially driving (4n−2)th and (4n−1)th gate lines among the gate lines during even frame periods, and a timing controller for generating different first and second gate control signals and a data control signal according to odd and even frame periods to supply the first and second gate control signals and the data control signal to the first and second gate drivers and the data driver, respectively.